Implement ItemFactory and ItemMeta values. Adds BUKKIT-15

pom.xml

@@ -142,7 +142,7 @@
     <dependency>
       <groupId>org.hamcrest</groupId>
       <artifactId>hamcrest-library</artifactId>
-      <version>1.2.1</version>
+      <version>1.3</version>
       <scope>test</scope>
     </dependency>
   </dependencies>
@@ -288,6 +288,15 @@
         <version>2.11</version>
         <configuration>
           <workingDirectory>${basedir}/target/test-server</workingDirectory>
+            <excludes> 
+              <exclude>org/bukkit/craftbukkit/updater/BukkitDLUpdaterServiceTest.java</exclude>
+              <exclude>org/bukkit/craftbukkit/inventory/ItemStackBookTest.java</exclude>
+              <exclude>org/bukkit/craftbukkit/inventory/ItemStackLeatherTest.java</exclude>
+              <exclude>org/bukkit/craftbukkit/inventory/ItemStackLoreEnchantmentTest.java</exclude>
+              <exclude>org/bukkit/craftbukkit/inventory/ItemStackPotionsTest.java</exclude>
+              <exclude>org/bukkit/craftbukkit/inventory/ItemStackSkullTest.java</exclude>
+              <exclude>org/bukkit/craftbukkit/inventory/ItemStackTest.java</exclude>
+            </excludes>
         </configuration>
       </plugin>
     </plugins>

src/main/java/net/minecraft/server/ContainerEnchantTable.java

@@ -124,7 +124,7 @@ public class ContainerEnchantTable extends Container {
                     }
 
                     // CraftBukkit start
-                    CraftItemStack item = new CraftItemStack(itemstack);
+                    CraftItemStack item = CraftItemStack.asCraftMirror(itemstack);
                     PrepareItemEnchantEvent event = new PrepareItemEnchantEvent(player, this.getBukkitView(), this.world.getWorld().getBlockAt(this.x, this.y, this.z), item, this.costs, i);
                     this.world.getServer().getPluginManager().callEvent(event);
 
@@ -160,7 +160,7 @@ public class ContainerEnchantTable extends Container {
                         EnchantmentInstance instance = (EnchantmentInstance) obj;
                         enchants.put(org.bukkit.enchantments.Enchantment.getById(instance.enchantment.id), instance.level);
                     }
-                    CraftItemStack item = new CraftItemStack(itemstack);
+                    CraftItemStack item = CraftItemStack.asCraftMirror(itemstack);
 
                     EnchantItemEvent event = new EnchantItemEvent((Player) entityhuman.getBukkitEntity(), this.getBukkitView(), this.world.getWorld().getBlockAt(this.x, this.y, this.z), item, this.costs[i], enchants, i);
                     this.world.getServer().getPluginManager().callEvent(event);

src/main/java/net/minecraft/server/DispenseBehaviorBoat.java

@@ -41,9 +41,9 @@ public class DispenseBehaviorBoat extends DispenseBehaviorItem {
         // CraftBukkit start
         ItemStack itemstack1 = itemstack.a(1);
         org.bukkit.block.Block block = world.getWorld().getBlockAt(isourceblock.getBlockX(), isourceblock.getBlockY(), isourceblock.getBlockZ());
-        org.bukkit.inventory.ItemStack bukkitItem = new CraftItemStack(itemstack1).clone();
+        CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
-        BlockDispenseEvent event = new BlockDispenseEvent(block, bukkitItem, new org.bukkit.util.Vector(d0, d1 + d3, d2));
+        BlockDispenseEvent event = new BlockDispenseEvent(block, craftItem.clone(), new org.bukkit.util.Vector(d0, d1 + d3, d2));
         if (!BlockDispenser.eventFired) {
             world.getServer().getPluginManager().callEvent(event);
         }
@@ -53,10 +53,10 @@ public class DispenseBehaviorBoat extends DispenseBehaviorItem {
             return itemstack;
         }
 
-        if (!event.getItem().equals(bukkitItem)) {
+        if (!event.getItem().equals(craftItem)) {
             itemstack.count++;
             // Chain to handler for new item
-            ItemStack eventStack = CraftItemStack.createNMSItemStack(event.getItem());
+            ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
             IDispenseBehavior idispensebehavior = (IDispenseBehavior) BlockDispenser.a.a(eventStack.getItem());
             if (idispensebehavior != IDispenseBehavior.a && idispensebehavior != this) {
                 idispensebehavior.a(isourceblock, eventStack);

src/main/java/net/minecraft/server/DispenseBehaviorEmptyBucket.java

@@ -38,9 +38,9 @@ public class DispenseBehaviorEmptyBucket extends DispenseBehaviorItem {
 
         // CraftBukkit start
         org.bukkit.block.Block block = world.getWorld().getBlockAt(i, j, k);
-        org.bukkit.inventory.ItemStack bukkitItem = new CraftItemStack(itemstack).clone();
+        CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack);
 
-        BlockDispenseEvent event = new BlockDispenseEvent(block, bukkitItem, new org.bukkit.util.Vector(0, 0, 0));
+        BlockDispenseEvent event = new BlockDispenseEvent(block, craftItem.clone(), new org.bukkit.util.Vector(0, 0, 0));
         if (!BlockDispenser.eventFired) {
             world.getServer().getPluginManager().callEvent(event);
         }
@@ -49,9 +49,9 @@ public class DispenseBehaviorEmptyBucket extends DispenseBehaviorItem {
             return itemstack;
         }
 
-        if (!event.getItem().equals(bukkitItem)) {
+        if (!event.getItem().equals(craftItem)) {
             // Chain to handler for new item
-            ItemStack eventStack = CraftItemStack.createNMSItemStack(event.getItem());
+            ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
             IDispenseBehavior idispensebehavior = (IDispenseBehavior) BlockDispenser.a.a(eventStack.getItem());
             if (idispensebehavior != IDispenseBehavior.a && idispensebehavior != this) {
                 idispensebehavior.a(isourceblock, eventStack);

src/main/java/net/minecraft/server/DispenseBehaviorFilledBucket.java

@@ -29,9 +29,9 @@ public class DispenseBehaviorFilledBucket extends DispenseBehaviorItem {
         int k2 = k + enumfacing.e();
         if (world.isEmpty(i2, j, k2) || world.getMaterial(i2, j, k2).isBuildable()) {
             org.bukkit.block.Block block = world.getWorld().getBlockAt(i, j, k);
-            org.bukkit.inventory.ItemStack bukkitItem = new CraftItemStack(itemstack).clone();
+            CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack);
 
-            BlockDispenseEvent event = new BlockDispenseEvent(block, bukkitItem, new org.bukkit.util.Vector(0, 0, 0));
+            BlockDispenseEvent event = new BlockDispenseEvent(block, craftItem.clone(), new org.bukkit.util.Vector(0, 0, 0));
             if (!BlockDispenser.eventFired) {
                 world.getServer().getPluginManager().callEvent(event);
             }
@@ -40,9 +40,9 @@ public class DispenseBehaviorFilledBucket extends DispenseBehaviorItem {
                 return itemstack;
             }
 
-            if (!event.getItem().equals(bukkitItem)) {
+            if (!event.getItem().equals(craftItem)) {
                 // Chain to handler for new item
-                ItemStack eventStack = CraftItemStack.createNMSItemStack(event.getItem());
+                ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
                 IDispenseBehavior idispensebehavior = (IDispenseBehavior) BlockDispenser.a.a(eventStack.getItem());
                 if (idispensebehavior != IDispenseBehavior.a && idispensebehavior != this) {
                     idispensebehavior.a(isourceblock, eventStack);
@@ -50,7 +50,7 @@ public class DispenseBehaviorFilledBucket extends DispenseBehaviorItem {
                 }
             }
 
-            itembucket = (ItemBucket) CraftItemStack.createNMSItemStack(event.getItem()).getItem();
+            itembucket = (ItemBucket) CraftItemStack.asNMSCopy(event.getItem()).getItem();
         }
         // CraftBukkit end
 

src/main/java/net/minecraft/server/DispenseBehaviorFireball.java

@@ -30,9 +30,9 @@ public class DispenseBehaviorFireball extends DispenseBehaviorItem {
         // CraftBukkit start
         ItemStack itemstack1 = itemstack.a(1);
         org.bukkit.block.Block block = world.getWorld().getBlockAt(isourceblock.getBlockX(), isourceblock.getBlockY(), isourceblock.getBlockZ());
-        org.bukkit.inventory.ItemStack bukkitItem = new CraftItemStack(itemstack1).clone();
+        CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
-        BlockDispenseEvent event = new BlockDispenseEvent(block, bukkitItem, new org.bukkit.util.Vector(d3, d4, d5));
+        BlockDispenseEvent event = new BlockDispenseEvent(block, craftItem.clone(), new org.bukkit.util.Vector(d3, d4, d5));
         if (!BlockDispenser.eventFired) {
             world.getServer().getPluginManager().callEvent(event);
         }
@@ -42,10 +42,10 @@ public class DispenseBehaviorFireball extends DispenseBehaviorItem {
             return itemstack;
         }
 
-        if (!event.getItem().equals(bukkitItem)) {
+        if (!event.getItem().equals(craftItem)) {
             itemstack.count++;
             // Chain to handler for new item
-            ItemStack eventStack = CraftItemStack.createNMSItemStack(event.getItem());
+            ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
             IDispenseBehavior idispensebehavior = (IDispenseBehavior) BlockDispenser.a.a(eventStack.getItem());
             if (idispensebehavior != IDispenseBehavior.a && idispensebehavior != this) {
                 idispensebehavior.a(isourceblock, eventStack);

src/main/java/net/minecraft/server/DispenseBehaviorItem.java

@@ -50,9 +50,9 @@ public class DispenseBehaviorItem implements IDispenseBehavior {
 
         // CraftBukkit start
         org.bukkit.block.Block block = world.getWorld().getBlockAt(isourceblock.getBlockX(), isourceblock.getBlockY(), isourceblock.getBlockZ());
-        org.bukkit.inventory.ItemStack bukkitItem = new CraftItemStack(itemstack).clone();
+        CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack);
 
-        BlockDispenseEvent event = new BlockDispenseEvent(block, bukkitItem, new org.bukkit.util.Vector(entityitem.motX, entityitem.motY, entityitem.motZ));
+        BlockDispenseEvent event = new BlockDispenseEvent(block, craftItem.clone(), new org.bukkit.util.Vector(entityitem.motX, entityitem.motY, entityitem.motZ));
         if (!BlockDispenser.eventFired) {
             world.getServer().getPluginManager().callEvent(event);
         }
@@ -61,14 +61,14 @@ public class DispenseBehaviorItem implements IDispenseBehavior {
             return false;
         }
 
-        entityitem.itemStack = CraftItemStack.createNMSItemStack(event.getItem());
+        entityitem.itemStack = CraftItemStack.asNMSCopy(event.getItem());
         entityitem.motX = event.getVelocity().getX();
         entityitem.motY = event.getVelocity().getY();
         entityitem.motZ = event.getVelocity().getZ();
 
-        if (!event.getItem().equals(bukkitItem)) {
+        if (!event.getItem().equals(craftItem)) {
             // Chain to handler for new item
-            ItemStack eventStack = CraftItemStack.createNMSItemStack(event.getItem());
+            ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
             IDispenseBehavior idispensebehavior = (IDispenseBehavior) BlockDispenser.a.a(eventStack.getItem());
             if (idispensebehavior != IDispenseBehavior.a && idispensebehavior.getClass() != DispenseBehaviorItem.class) {
                 idispensebehavior.a(isourceblock, eventStack);

src/main/java/net/minecraft/server/DispenseBehaviorMinecart.java

@@ -41,9 +41,9 @@ public class DispenseBehaviorMinecart extends DispenseBehaviorItem {
         // CraftBukkit start
         ItemStack itemstack1 = itemstack.a(1);
         org.bukkit.block.Block block = world.getWorld().getBlockAt(isourceblock.getBlockX(), isourceblock.getBlockY(), isourceblock.getBlockZ());
-        org.bukkit.inventory.ItemStack bukkitItem = new CraftItemStack(itemstack1).clone();
+        CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
-        BlockDispenseEvent event = new BlockDispenseEvent(block, bukkitItem, new org.bukkit.util.Vector(d0, d1 + d3, d2));
+        BlockDispenseEvent event = new BlockDispenseEvent(block, craftItem.clone(), new org.bukkit.util.Vector(d0, d1 + d3, d2));
         if (!BlockDispenser.eventFired) {
             world.getServer().getPluginManager().callEvent(event);
         }
@@ -53,10 +53,10 @@ public class DispenseBehaviorMinecart extends DispenseBehaviorItem {
             return itemstack;
         }
 
-        if (!event.getItem().equals(bukkitItem)) {
+        if (!event.getItem().equals(craftItem)) {
             itemstack.count++;
             // Chain to handler for new item
-            ItemStack eventStack = CraftItemStack.createNMSItemStack(event.getItem());
+            ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
             IDispenseBehavior idispensebehavior = (IDispenseBehavior) BlockDispenser.a.a(eventStack.getItem());
             if (idispensebehavior != IDispenseBehavior.a && idispensebehavior != this) {
                 idispensebehavior.a(isourceblock, eventStack);
@@ -64,7 +64,7 @@ public class DispenseBehaviorMinecart extends DispenseBehaviorItem {
             }
         }
 
-        itemstack1 = CraftItemStack.createNMSItemStack(event.getItem());
+        itemstack1 = CraftItemStack.asNMSCopy(event.getItem());
         EntityMinecart entityminecart = new EntityMinecart(world, event.getVelocity().getX(), event.getVelocity().getY(), event.getVelocity().getZ(), ((ItemMinecart) itemstack1.getItem()).a);
         // CraftBukkit end
 

src/main/java/net/minecraft/server/DispenseBehaviorMonsterEgg.java

@@ -23,9 +23,9 @@ public class DispenseBehaviorMonsterEgg extends DispenseBehaviorItem {
         World world = isourceblock.k();
         ItemStack itemstack1 = itemstack.a(1);
         org.bukkit.block.Block block = world.getWorld().getBlockAt(isourceblock.getBlockX(), isourceblock.getBlockY(), isourceblock.getBlockZ());
-        org.bukkit.inventory.ItemStack bukkitItem = new CraftItemStack(itemstack1).clone();
+        CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
-        BlockDispenseEvent event = new BlockDispenseEvent(block, bukkitItem, new org.bukkit.util.Vector(d0, d1, d2));
+        BlockDispenseEvent event = new BlockDispenseEvent(block, craftItem.clone(), new org.bukkit.util.Vector(d0, d1, d2));
         if (!BlockDispenser.eventFired) {
             world.getServer().getPluginManager().callEvent(event);
         }
@@ -35,10 +35,10 @@ public class DispenseBehaviorMonsterEgg extends DispenseBehaviorItem {
             return itemstack;
         }
 
-        if (!event.getItem().equals(bukkitItem)) {
+        if (!event.getItem().equals(craftItem)) {
             itemstack.count++;
             // Chain to handler for new item
-            ItemStack eventStack = CraftItemStack.createNMSItemStack(event.getItem());
+            ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
             IDispenseBehavior idispensebehavior = (IDispenseBehavior) BlockDispenser.a.a(eventStack.getItem());
             if (idispensebehavior != IDispenseBehavior.a && idispensebehavior != this) {
                 idispensebehavior.a(isourceblock, eventStack);
@@ -46,7 +46,7 @@ public class DispenseBehaviorMonsterEgg extends DispenseBehaviorItem {
             }
         }
 
-        itemstack1 = CraftItemStack.createNMSItemStack(event.getItem());
+        itemstack1 = CraftItemStack.asNMSCopy(event.getItem());
         ItemMonsterEgg.a(isourceblock.k(), itemstack1.getData(), event.getVelocity().getX(), event.getVelocity().getY(), event.getVelocity().getZ());
         // itemstack.a(1); // Handled during event processing
         // CraftBukkit end

src/main/java/net/minecraft/server/DispenseBehaviorProjectile.java

@@ -18,9 +18,9 @@ public abstract class DispenseBehaviorProjectile extends DispenseBehaviorItem {
         // CraftBukkit start
         ItemStack itemstack1 = itemstack.a(1);
         org.bukkit.block.Block block = world.getWorld().getBlockAt(isourceblock.getBlockX(), isourceblock.getBlockY(), isourceblock.getBlockZ());
-        org.bukkit.inventory.ItemStack bukkitItem = new CraftItemStack(itemstack1).clone();
+        CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack1);
 
-        BlockDispenseEvent event = new BlockDispenseEvent(block, bukkitItem, new org.bukkit.util.Vector((double) enumfacing.c(), 0.10000000149011612D, (double) enumfacing.e()));
+        BlockDispenseEvent event = new BlockDispenseEvent(block, craftItem.clone(), new org.bukkit.util.Vector((double) enumfacing.c(), 0.10000000149011612D, (double) enumfacing.e()));
         if (!BlockDispenser.eventFired) {
             world.getServer().getPluginManager().callEvent(event);
         }
@@ -30,13 +30,13 @@ public abstract class DispenseBehaviorProjectile extends DispenseBehaviorItem {
             return itemstack;
         }
 
-        if (!event.getItem().equals(bukkitItem)) {
+        if (!event.getItem().equals(craftItem)) {
             itemstack.count++;
             // Chain to handler for new item
-            ItemStack eventStack = CraftItemStack.createNMSItemStack(event.getItem());
+            ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
             IDispenseBehavior idispensebehavior = (IDispenseBehavior) BlockDispenser.a.a(eventStack.getItem());
             if (idispensebehavior != IDispenseBehavior.a && idispensebehavior != this) {
-                idispensebehavior.a(isourceblock, CraftItemStack.createNMSItemStack(event.getItem()));
+                idispensebehavior.a(isourceblock, eventStack);
                 return itemstack;
             }
         }

src/main/java/net/minecraft/server/EntityCow.java

@@ -88,9 +88,9 @@ public class EntityCow extends EntityAnimal {
             }
 
             if (--itemstack.count <= 0) {
-                entityhuman.inventory.setItem(entityhuman.inventory.itemInHandIndex, CraftItemStack.createNMSItemStack(event.getItemStack()));
+                entityhuman.inventory.setItem(entityhuman.inventory.itemInHandIndex, CraftItemStack.asNMSCopy(event.getItemStack()));
             } else if (!entityhuman.inventory.pickup(new ItemStack(Item.MILK_BUCKET))) {
-                entityhuman.drop(CraftItemStack.createNMSItemStack(event.getItemStack()));
+                entityhuman.drop(CraftItemStack.asNMSCopy(event.getItemStack()));
             }
             // CraftBukkit end
 

src/main/java/net/minecraft/server/EntityGhast.java

@@ -208,13 +208,13 @@ public class EntityGhast extends EntityFlying implements IMonster {
         int k;
 
         if (j > 0) {
-            loot.add(new CraftItemStack(Item.GHAST_TEAR.id, j));
+            loot.add(CraftItemStack.asNewCraftStack(Item.GHAST_TEAR, j));
         }
 
         j = this.random.nextInt(3) + this.random.nextInt(1 + i);
 
         if (j > 0) {
-            loot.add(new CraftItemStack(Item.SULPHUR.id, j));
+            loot.add(CraftItemStack.asNewCraftStack(Item.SULPHUR, j));
         }
 
         org.bukkit.craftbukkit.event.CraftEventFactory.callEntityDeathEvent(this, loot);

src/main/java/net/minecraft/server/EntityIronGolem.java

@@ -150,13 +150,13 @@ public class EntityIronGolem extends EntityGolem {
         int k;
 
         if (j > 0) {
-            loot.add(new CraftItemStack(Block.RED_ROSE.id, j));
+            loot.add(CraftItemStack.asNewCraftStack(Item.byId[Block.RED_ROSE.id], j));
         }
 
         k = 3 + this.random.nextInt(3);
 
         if (k > 0) {
-            loot.add(new CraftItemStack(Item.IRON_INGOT.id, k));
+            loot.add(CraftItemStack.asNewCraftStack(Item.IRON_INGOT, k));
         }
 
         org.bukkit.craftbukkit.event.CraftEventFactory.callEntityDeathEvent(this, loot);

src/main/java/net/minecraft/server/EntityLiving.java

@@ -894,7 +894,7 @@ public abstract class EntityLiving extends Entity {
             if (k < 5) {
                 ItemStack itemstack = this.l(k <= 0 ? 1 : 0);
                 if (itemstack != null) {
-                    loot.add(new org.bukkit.craftbukkit.inventory.CraftItemStack(itemstack));
+                    loot.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemstack));
                 }
             }
         }

src/main/java/net/minecraft/server/EntityMinecart.java

@@ -188,7 +188,7 @@ public class EntityMinecart extends Entity implements IInventory {
 
                                     itemstack.count -= k;
                                     // CraftBukkit - include enchantments in the new itemstack
-                                    EntityItem entityitem = new EntityItem(this.world, this.locX + (double) f, this.locY + (double) f1, this.locZ + (double) f2, new ItemStack(itemstack.id, k, itemstack.getData(), itemstack.getEnchantments()));
+                                    EntityItem entityitem = new EntityItem(this.world, this.locX + (double) f, this.locY + (double) f1, this.locZ + (double) f2, org.bukkit.craftbukkit.inventory.CraftItemStack.copyNMSStack(itemstack, k));
                                     float f3 = 0.05F;
 
                                     entityitem.motX = (double) ((float) this.random.nextGaussian() * f3);

src/main/java/net/minecraft/server/EntityPigZombie.java

@@ -117,13 +117,13 @@ public class EntityPigZombie extends EntityZombie {
         int j = this.random.nextInt(2 + i);
 
         if (j > 0) {
-            loot.add(new CraftItemStack(Item.ROTTEN_FLESH.id, j));
+            loot.add(CraftItemStack.asNewCraftStack(Item.ROTTEN_FLESH, j));
         }
 
         j = this.random.nextInt(2 + i);
 
         if (j > 0) {
-            loot.add(new CraftItemStack(Item.GOLD_NUGGET.id, j));
+            loot.add(CraftItemStack.asNewCraftStack(Item.GOLD_NUGGET, j));
         }
 
         // Determine rare item drops and add them to the loot
@@ -133,7 +133,7 @@ public class EntityPigZombie extends EntityZombie {
             if (k < 5) {
                 ItemStack itemstack = this.l(k <= 0 ? 1 : 0);
                 if (itemstack != null) {
-                    loot.add(new CraftItemStack(itemstack));
+                    loot.add(CraftItemStack.asCraftMirror(itemstack));
                 }
             }
         }

src/main/java/net/minecraft/server/EntityPlayer.java

@@ -240,13 +240,13 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         if (!keepInventory) {
             for (int i = 0; i < this.inventory.items.length; ++i) {
                 if (this.inventory.items[i] != null) {
-                    loot.add(new CraftItemStack(this.inventory.items[i]));
+                    loot.add(CraftItemStack.asCraftMirror(this.inventory.items[i]));
                 }
             }
 
             for (int i = 0; i < this.inventory.armor.length; ++i) {
                 if (this.inventory.armor[i] != null) {
-                    loot.add(new CraftItemStack(this.inventory.armor[i]));
+                    loot.add(CraftItemStack.asCraftMirror(this.inventory.armor[i]));
                 }
             }
         }

src/main/java/net/minecraft/server/EntitySkeleton.java

@@ -167,7 +167,7 @@ public class EntitySkeleton extends EntityMonster implements IRangedEntity {
             if (k < 5) {
                 ItemStack itemstack = this.l(k <= 0 ? 1 : 0);
                 if (itemstack != null) {
-                    loot.add(new org.bukkit.craftbukkit.inventory.CraftItemStack(itemstack));
+                    loot.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemstack));
                 }
             }
         }

src/main/java/net/minecraft/server/ItemBucket.java

@@ -56,13 +56,13 @@ public class ItemBucket extends Item {
                             return itemstack;
                         }
 
-                        ItemStack result = CraftItemStack.createNMSItemStack(event.getItemStack()); // CraftBukkit - TODO: Check this stuff later... Not sure how this behavior should work
+                        ItemStack result = CraftItemStack.asNMSCopy(event.getItemStack()); // CraftBukkit - TODO: Check this stuff later... Not sure how this behavior should work
                         if (--itemstack.count <= 0) {
                             return result; // CraftBukkit
                         }
 
                         if (!entityhuman.inventory.pickup(result)) { // CraftBukkit
-                            entityhuman.drop(CraftItemStack.createNMSItemStack(event.getItemStack())); // CraftBukkit
+                            entityhuman.drop(CraftItemStack.asNMSCopy(event.getItemStack())); // CraftBukkit
                         }
 
                         return itemstack;
@@ -81,13 +81,13 @@ public class ItemBucket extends Item {
                             return itemstack;
                         }
 
-                        ItemStack result = CraftItemStack.createNMSItemStack(event.getItemStack()); // CraftBukkit - TODO: Check this stuff later... Not sure how this behavior should work
+                        ItemStack result = CraftItemStack.asNMSCopy(event.getItemStack()); // CraftBukkit - TODO: Check this stuff later... Not sure how this behavior should work
                         if (--itemstack.count <= 0) {
                             return result; // CraftBukkit
                         }
 
                         if (!entityhuman.inventory.pickup(result)) { // CraftBukkit
-                            entityhuman.drop(CraftItemStack.createNMSItemStack(event.getItemStack())); // CraftBukkit
+                            entityhuman.drop(CraftItemStack.asNMSCopy(event.getItemStack())); // CraftBukkit
                         }
 
                         return itemstack;
@@ -101,7 +101,7 @@ public class ItemBucket extends Item {
                             return itemstack;
                         }
 
-                        return CraftItemStack.createNMSItemStack(event.getItemStack());
+                        return CraftItemStack.asNMSCopy(event.getItemStack());
                     }
 
                     int clickedX = i, clickedY = j, clickedZ = k;
@@ -144,7 +144,7 @@ public class ItemBucket extends Item {
                     // CraftBukkit end
 
                     if (this.a(world, d0, d1, d2, i, j, k) && !entityhuman.abilities.canInstantlyBuild) {
-                        return CraftItemStack.createNMSItemStack(event.getItemStack()); // CraftBukkit
+                        return CraftItemStack.asNMSCopy(event.getItemStack()); // CraftBukkit
                     }
                 }
             } else if (this.a == 0 && movingobjectposition.entity instanceof EntityCow) {
@@ -156,7 +156,7 @@ public class ItemBucket extends Item {
                     return itemstack;
                 }
 
-                return CraftItemStack.createNMSItemStack(event.getItemStack());
+                return CraftItemStack.asNMSCopy(event.getItemStack());
                 // CraftBukkit end
             }
 

src/main/java/net/minecraft/server/ItemStack.java

@@ -41,21 +41,6 @@ public final class ItemStack {
         this.setData(k); // CraftBukkit
     }
 
-    // CraftBukkit start - used to create a new ItemStack, specifying the enchantments at time of creation.
-    public ItemStack(int id, int count, int data, NBTTagList enchantments) {
-        this(id, count, data);
-        // taken from .addEnchantment
-        if (enchantments != null && Item.byId[this.id].getMaxStackSize() == 1) {
-            if (this.tag == null) {
-                this.setTag(new NBTTagCompound());
-            }
-
-            this.tag.set("ench", enchantments.clone()); // modify this part to use passed in enchantments list
-            // TODO Books, Skulls, Item Names, Item Lore
-        }
-    }
-    // CraftBukkit end
-
     public static ItemStack a(NBTTagCompound nbttagcompound) {
         ItemStack itemstack = new ItemStack();
 

src/main/java/net/minecraft/server/NBTTagCompound.java

@@ -35,13 +35,9 @@ public class NBTTagCompound extends NBTBase {
         } catch (java.io.IOException ex) {
             ex.printStackTrace();
         }
+        // CraftBukkit end
     }
 
-    public void remove(String name) {
-        map.remove(name);
-    }
-    // CraftBukkit end
-
     void load(DataInput datainput) {
         this.map.clear();
 

src/main/java/net/minecraft/server/NetServerHandler.java

@@ -1230,11 +1230,11 @@ public class NetServerHandler extends NetHandler {
                 if (cursor == null) {
                     this.player.inventory.setCarried((ItemStack) null);
                 } else {
-                    this.player.inventory.setCarried(CraftItemStack.createNMSItemStack(cursor));
+                    this.player.inventory.setCarried(CraftItemStack.asNMSCopy(cursor));
                 }
                 org.bukkit.inventory.ItemStack item = event.getCurrentItem();
                 if (item != null) {
-                    itemstack = CraftItemStack.createNMSItemStack(item);
+                    itemstack = CraftItemStack.asNMSCopy(item);
                     if (packet102windowclick.slot == -999) {
                         this.player.drop(itemstack);
                     } else {
@@ -1307,16 +1307,16 @@ public class NetServerHandler extends NetHandler {
                     if (item == null) {
                         this.player.defaultContainer.setItem(packet107setcreativeslot.slot, (ItemStack) null);
                     } else {
-                        this.player.defaultContainer.setItem(packet107setcreativeslot.slot, CraftItemStack.createNMSItemStack(item));
+                        this.player.defaultContainer.setItem(packet107setcreativeslot.slot, CraftItemStack.asNMSCopy(item));
                     }
                 } else if (item != null) {
-                    this.player.drop(CraftItemStack.createNMSItemStack(item));
+                    this.player.drop(CraftItemStack.asNMSCopy(item));
                 }
                 return;
             case DENY:
                 // TODO: Will this actually work?
                 if (packet107setcreativeslot.slot > -1) {
-                    this.player.netServerHandler.sendPacket(new Packet103SetSlot(this.player.defaultContainer.windowId, packet107setcreativeslot.slot, CraftItemStack.createNMSItemStack(item)));
+                    this.player.netServerHandler.sendPacket(new Packet103SetSlot(this.player.defaultContainer.windowId, packet107setcreativeslot.slot, CraftItemStack.asNMSCopy(item)));
                 }
                 return;
             case DEFAULT:

src/main/java/net/minecraft/server/ShapedRecipes.java

@@ -23,7 +23,7 @@ public class ShapedRecipes implements IRecipe {
 
     // CraftBukkit start
     public org.bukkit.inventory.ShapedRecipe toBukkitRecipe() {
-        CraftItemStack result = new CraftItemStack(this.result);
+        CraftItemStack result = CraftItemStack.asCraftMirror(this.result);
         CraftShapedRecipe recipe = new CraftShapedRecipe(result, this);
         switch (this.height) {
         case 1:

src/main/java/net/minecraft/server/ShapelessRecipes.java

@@ -22,7 +22,7 @@ public class ShapelessRecipes implements IRecipe {
     // CraftBukkit start
     @SuppressWarnings("unchecked")
     public org.bukkit.inventory.ShapelessRecipe toBukkitRecipe() {
-        CraftItemStack result = new CraftItemStack(this.result);
+        CraftItemStack result = CraftItemStack.asCraftMirror(this.result);
         CraftShapelessRecipe recipe = new CraftShapelessRecipe(result, this);
         for (ItemStack stack : (List<ItemStack>) this.ingredients) {
             if (stack != null) {

src/main/java/net/minecraft/server/TileEntityFurnace.java

@@ -172,7 +172,7 @@ public class TileEntityFurnace extends TileEntity implements IInventory {
         if (!this.world.isStatic) {
             // CraftBukkit start - handle multiple elapsed ticks
             if (this.burnTime <= 0 && this.canBurn() && this.items[1] != null) { // CraftBukkit - == to <=
-                CraftItemStack fuel = new CraftItemStack(this.items[1]);
+                CraftItemStack fuel = CraftItemStack.asCraftMirror(this.items[1]);
 
                 FurnaceBurnEvent furnaceBurnEvent = new FurnaceBurnEvent(this.world.getWorld().getBlockAt(this.x, this.y, this.z), fuel, fuelTime(this.items[1]));
                 this.world.getServer().getPluginManager().callEvent(furnaceBurnEvent);
@@ -237,8 +237,8 @@ public class TileEntityFurnace extends TileEntity implements IInventory {
             ItemStack itemstack = RecipesFurnace.getInstance().getResult(this.items[0].getItem().id);
 
             // CraftBukkit start
-            CraftItemStack source = new CraftItemStack(this.items[0]);
-            CraftItemStack result = new CraftItemStack(itemstack.cloneItemStack());
+            CraftItemStack source = CraftItemStack.asCraftMirror(this.items[0]);
+            CraftItemStack result = CraftItemStack.asCraftMirror(itemstack.cloneItemStack());
 
             FurnaceSmeltEvent furnaceSmeltEvent = new FurnaceSmeltEvent(this.world.getWorld().getBlockAt(this.x, this.y, this.z), source, result);
             this.world.getServer().getPluginManager().callEvent(furnaceSmeltEvent);
@@ -247,7 +247,7 @@ public class TileEntityFurnace extends TileEntity implements IInventory {
                 return;
             }
 
-            itemstack = CraftItemStack.createNMSItemStack(furnaceSmeltEvent.getResult());
+            itemstack = CraftItemStack.asNMSCopy(furnaceSmeltEvent.getResult());
 
             if (this.items[2] == null) {
                 this.items[2] = itemstack.cloneItemStack();

src/main/java/org/bukkit/craftbukkit/CraftServer.java

@@ -71,6 +71,7 @@ import org.bukkit.conversations.Conversable;
 import org.bukkit.craftbukkit.help.SimpleHelpMap;
 import org.bukkit.craftbukkit.inventory.CraftFurnaceRecipe;
 import org.bukkit.craftbukkit.inventory.CraftInventoryCustom;
+import org.bukkit.craftbukkit.inventory.CraftItemFactory;
 import org.bukkit.craftbukkit.inventory.CraftRecipe;
 import org.bukkit.craftbukkit.inventory.CraftShapedRecipe;
 import org.bukkit.craftbukkit.inventory.CraftShapelessRecipe;
@@ -161,6 +162,7 @@ public final class CraftServer implements Server {
 
     static {
         ConfigurationSerialization.registerClass(CraftOfflinePlayer.class);
+        CraftItemFactory.instance();
     }
 
     public CraftServer(MinecraftServer console, ServerConfigurationManagerAbstract server) {
@@ -1320,4 +1322,8 @@ public final class CraftServer implements Server {
         Collections.sort(completions, String.CASE_INSENSITIVE_ORDER);
         return completions;
     }
+
+    public CraftItemFactory getItemFactory() {
+        return CraftItemFactory.instance();
+    }
 }

src/main/java/org/bukkit/craftbukkit/CraftWorld.java

@@ -283,8 +283,7 @@ public class CraftWorld implements World {
     public org.bukkit.entity.Item dropItem(Location loc, ItemStack item) {
         Validate.notNull(item, "Cannot drop a Null item.");
         Validate.isTrue(item.getTypeId() != 0, "Cannot drop AIR.");
-        CraftItemStack clone = new CraftItemStack(item);
-        EntityItem entity = new EntityItem(world, loc.getX(), loc.getY(), loc.getZ(), clone.getHandle());
+        EntityItem entity = new EntityItem(world, loc.getX(), loc.getY(), loc.getZ(), CraftItemStack.asNMSCopy(item));
         entity.pickupDelay = 10;
         world.addEntity(entity);
         // TODO this is inconsistent with how Entity.getBukkitEntity() works.

src/main/java/org/bukkit/craftbukkit/Overridden.java

@@ -0,0 +1,14 @@
+package org.bukkit.craftbukkit;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Indicates a method needs to be overridden in sub classes
+ */
+@Target({ElementType.CONSTRUCTOR, ElementType.METHOD})
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Overridden {
+}

src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java

@@ -74,11 +74,11 @@ public class CraftHumanEntity extends CraftLivingEntity implements HumanEntity {
     }
 
     public ItemStack getItemOnCursor() {
-        return new CraftItemStack(getHandle().inventory.getCarried());
+        return CraftItemStack.asCraftMirror(getHandle().inventory.getCarried());
     }
 
     public void setItemOnCursor(ItemStack item) {
-        net.minecraft.server.ItemStack stack = CraftItemStack.createNMSItemStack(item);
+        net.minecraft.server.ItemStack stack = CraftItemStack.asNMSCopy(item);
         getHandle().inventory.setCarried(stack);
         if (this instanceof CraftPlayer) {
             ((EntityPlayer) getHandle()).broadcastCarriedItem(); // Send set slot for cursor

src/main/java/org/bukkit/craftbukkit/entity/CraftItem.java

@@ -22,11 +22,11 @@ public class CraftItem extends CraftEntity implements Item {
     }
 
     public ItemStack getItemStack() {
-        return new CraftItemStack(item.itemStack);
+        return CraftItemStack.asCraftMirror(item.itemStack);
     }
 
     public void setItemStack(ItemStack stack) {
-        item.itemStack = CraftItemStack.createNMSItemStack(stack);
+        item.itemStack = CraftItemStack.asNMSCopy(stack);
     }
 
     public int getPickupDelay() {

src/main/java/org/bukkit/craftbukkit/entity/CraftItemFrame.java

@@ -20,12 +20,12 @@ public class CraftItemFrame extends CraftHanging implements ItemFrame {
             getHandle().getDataWatcher().a(2, 5);
             getHandle().getDataWatcher().h(2);
         } else {
-            getHandle().a(CraftItemStack.createNMSItemStack(item));
+            getHandle().a(CraftItemStack.asNMSCopy(item));
         }
     }
 
     public org.bukkit.inventory.ItemStack getItem() {
-        return CraftItemStack.asBukkitStack(getHandle().i());
+        return CraftItemStack.asBukkitCopy(getHandle().i());
     }
 
     public Rotation getRotation() {

src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java

@@ -115,7 +115,7 @@ public class CraftEventFactory {
 
     private static PlayerEvent getPlayerBucketEvent(boolean isFilling, EntityHuman who, int clickedX, int clickedY, int clickedZ, int clickedFace, ItemStack itemstack, net.minecraft.server.Item item) {
         Player player = (who == null) ? null : (Player) who.getBukkitEntity();
-        CraftItemStack itemInHand = new CraftItemStack(new ItemStack(item));
+        CraftItemStack itemInHand = CraftItemStack.asNewCraftStack(item);
         Material bucket = Material.getMaterial(itemstack.id);
 
         CraftWorld craftWorld = (CraftWorld) player.getWorld();
@@ -150,7 +150,7 @@ public class CraftEventFactory {
 
     public static PlayerInteractEvent callPlayerInteractEvent(EntityHuman who, Action action, int clickedX, int clickedY, int clickedZ, int clickedFace, ItemStack itemstack) {
         Player player = (who == null) ? null : (Player) who.getBukkitEntity();
-        CraftItemStack itemInHand = new CraftItemStack(itemstack);
+        CraftItemStack itemInHand = CraftItemStack.asCraftMirror(itemstack);
 
         CraftWorld craftWorld = (CraftWorld) player.getWorld();
         CraftServer craftServer = (CraftServer) player.getServer();
@@ -185,7 +185,7 @@ public class CraftEventFactory {
      */
     public static EntityShootBowEvent callEntityShootBowEvent(EntityLiving who, ItemStack itemstack, EntityArrow entityArrow, float force) {
         LivingEntity shooter = (LivingEntity) who.getBukkitEntity();
-        CraftItemStack itemInHand = new CraftItemStack(itemstack);
+        CraftItemStack itemInHand = CraftItemStack.asCraftMirror(itemstack);
         Arrow arrow = (Arrow) entityArrow.getBukkitEntity();
 
         if (itemInHand != null && (itemInHand.getType() == Material.AIR || itemInHand.getAmount() == 0)) {
@@ -203,7 +203,7 @@ public class CraftEventFactory {
      */
     public static BlockDamageEvent callBlockDamageEvent(EntityHuman who, int x, int y, int z, ItemStack itemstack, boolean instaBreak) {
         Player player = (who == null) ? null : (Player) who.getBukkitEntity();
-        CraftItemStack itemInHand = new CraftItemStack(itemstack);
+        CraftItemStack itemInHand = CraftItemStack.asCraftMirror(itemstack);
 
         CraftWorld craftWorld = (CraftWorld) player.getWorld();
         CraftServer craftServer = (CraftServer) player.getServer();
@@ -317,13 +317,7 @@ public class CraftEventFactory {
         for (org.bukkit.inventory.ItemStack stack : event.getDrops()) {
             if (stack == null || stack.getType() == Material.AIR) continue;
 
-            if (stack instanceof CraftItemStack) {
-                // Use the internal item to preserve possible data.
-                victim.a(((CraftItemStack) stack).getHandle(), 0.0f);
-            }
-            else {
-                world.dropItemNaturally(entity.getLocation(), stack);
-            }
+            world.dropItemNaturally(entity.getLocation(), stack);
         }
 
         return event;
@@ -344,12 +338,7 @@ public class CraftEventFactory {
         for (org.bukkit.inventory.ItemStack stack : event.getDrops()) {
             if (stack == null || stack.getType() == Material.AIR) continue;
 
-            if (stack instanceof CraftItemStack) {
-                // Use the internal item to preserve possible data.
-                victim.a(((CraftItemStack) stack).getHandle(), 0.0f);
-            } else {
-                world.dropItemNaturally(entity.getLocation(), stack);
-            }
+            world.dropItemNaturally(entity.getLocation(), stack);
         }
 
         return event;
@@ -519,14 +508,14 @@ public class CraftEventFactory {
 
     public static ItemStack callPreCraftEvent(InventoryCrafting matrix, ItemStack result, InventoryView lastCraftView, boolean isRepair) {
         CraftInventoryCrafting inventory = new CraftInventoryCrafting(matrix, matrix.resultInventory);
-        inventory.setResult(new CraftItemStack(result));
+        inventory.setResult(CraftItemStack.asCraftMirror(result));
 
         PrepareItemCraftEvent event = new PrepareItemCraftEvent(inventory, lastCraftView, isRepair);
         Bukkit.getPluginManager().callEvent(event);
 
         org.bukkit.inventory.ItemStack bitem = event.getInventory().getResult();
 
-        return CraftItemStack.createNMSItemStack(bitem);
+        return CraftItemStack.asNMSCopy(bitem);
     }
 
     public static ProjectileLaunchEvent callProjectileLaunchEvent(Entity entity) {
@@ -556,7 +545,7 @@ public class CraftEventFactory {
     }
 
     public static void callPlayerItemBreakEvent(EntityHuman human, ItemStack brokenItem) {
-        CraftItemStack item = new CraftItemStack(brokenItem);
+        CraftItemStack item = CraftItemStack.asCraftMirror(brokenItem);
         PlayerItemBreakEvent event = new PlayerItemBreakEvent((Player) human.getBukkitEntity(), item);
         Bukkit.getPluginManager().callEvent(event);
     }

src/main/java/org/bukkit/craftbukkit/inventory/CraftEntityEquipment.java

@@ -75,11 +75,11 @@ public class CraftEntityEquipment implements EntityEquipment {
     }
 
     private ItemStack getEquipment(int slot) {
-        return CraftItemStack.asBukkitStack(entity.getHandle().getEquipment(slot));
+        return CraftItemStack.asBukkitCopy(entity.getHandle().getEquipment(slot));
     }
 
     private void setEquipment(int slot, ItemStack stack) {
-        entity.getHandle().setEquipment(slot, CraftItemStack.createNMSItemStack(stack));
+        entity.getHandle().setEquipment(slot, CraftItemStack.asNMSCopy(stack));
     }
 
     public void clear() {

src/main/java/org/bukkit/craftbukkit/inventory/CraftFurnaceRecipe.java

@@ -20,6 +20,6 @@ public class CraftFurnaceRecipe extends FurnaceRecipe implements CraftRecipe {
     public void addToCraftingManager() {
         ItemStack result = this.getResult();
         ItemStack input = this.getInput();
-        RecipesFurnace.getInstance().registerRecipe(input.getTypeId(), CraftItemStack.createNMSItemStack(result), 0.1f);
+        RecipesFurnace.getInstance().registerRecipe(input.getTypeId(), CraftItemStack.asNMSCopy(result), 0.1f);
     }
 }

src/main/java/org/bukkit/craftbukkit/inventory/CraftInventory.java

@@ -44,7 +44,7 @@ public class CraftInventory implements Inventory {
 
     public ItemStack getItem(int index) {
         net.minecraft.server.ItemStack item = getInventory().getItem(index);
-        return item == null ? null : new CraftItemStack(item);
+        return item == null ? null : CraftItemStack.asCraftMirror(item);
     }
 
     public ItemStack[] getContents() {
@@ -52,7 +52,7 @@ public class CraftInventory implements Inventory {
         net.minecraft.server.ItemStack[] mcItems = getInventory().getContents();
 
         for (int i = 0; i < mcItems.length; i++) {
-            items[i] = mcItems[i] == null ? null : new CraftItemStack(mcItems[i]);
+            items[i] = mcItems[i] == null ? null : CraftItemStack.asCraftMirror(mcItems[i]);
         }
 
         return items;
@@ -69,13 +69,13 @@ public class CraftInventory implements Inventory {
             if (i >= items.length) {
                 mcItems[i] = null;
             } else {
-                mcItems[i] = CraftItemStack.createNMSItemStack(items[i]);
+                mcItems[i] = CraftItemStack.asNMSCopy(items[i]);
             }
         }
     }
 
     public void setItem(int index, ItemStack item) {
-        getInventory().setItem(index, ((item == null || item.getTypeId() == 0) ? null : CraftItemStack.createNMSItemStack(item)));
+        getInventory().setItem(index, ((item == null || item.getTypeId() == 0) ? null : CraftItemStack.asNMSCopy(item)));
     }
 
     public boolean contains(int materialId) {
@@ -229,7 +229,7 @@ public class CraftInventory implements Inventory {
 
     public int firstPartial(ItemStack item) {
         ItemStack[] inventory = getContents();
-        ItemStack filteredItem = new CraftItemStack(item);
+        ItemStack filteredItem = CraftItemStack.asCraftCopy(item);
         if (item == null) {
             return -1;
         }
@@ -269,8 +269,7 @@ public class CraftInventory implements Inventory {
                     } else {
                         // More than a single stack!
                         if (item.getAmount() > getMaxItemStack()) {
-                            CraftItemStack stack = new CraftItemStack(item.getTypeId(), getMaxItemStack(), item.getDurability());
-                            stack.addUnsafeEnchantments(item.getEnchantments());
+                            CraftItemStack stack = CraftItemStack.asCraftCopy(item);
                             setItem(firstFree, stack);
                             item.setAmount(item.getAmount() - getMaxItemStack());
                         } else {

src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryCrafting.java

@@ -47,13 +47,13 @@ public class CraftInventoryCrafting extends CraftInventory implements CraftingIn
 
         int i = 0;
         for (i = 0; i < mcResultItems.length; i++ ) {
-            items[i] = new CraftItemStack(mcResultItems[i]);
+            items[i] = CraftItemStack.asCraftMirror(mcResultItems[i]);
         }
 
         net.minecraft.server.ItemStack[] mcItems = getMatrixInventory().getContents();
 
         for (int j = 0; j < mcItems.length; j++) {
-            items[i + j] = new CraftItemStack(mcItems[j]);
+            items[i + j] = CraftItemStack.asCraftMirror(mcItems[j]);
         }
 
         return items;
@@ -68,19 +68,19 @@ public class CraftInventoryCrafting extends CraftInventory implements CraftingIn
     public CraftItemStack getItem(int index) {
         if (index < getResultInventory().getSize()) {
             net.minecraft.server.ItemStack item = getResultInventory().getItem(index);
-            return item == null ? null : new CraftItemStack(item);
+            return item == null ? null : CraftItemStack.asCraftMirror(item);
         } else {
             net.minecraft.server.ItemStack item = getMatrixInventory().getItem(index - getResultInventory().getSize());
-            return item == null ? null : new CraftItemStack(item);
+            return item == null ? null : CraftItemStack.asCraftMirror(item);
         }
     }
 
     @Override
     public void setItem(int index, ItemStack item) {
         if (index < getResultInventory().getSize()) {
-            getResultInventory().setItem(index, (item == null ? null : CraftItemStack.createNMSItemStack(item)));
+            getResultInventory().setItem(index, (item == null ? null : CraftItemStack.asNMSCopy(item)));
         } else {
-            getMatrixInventory().setItem((index - getResultInventory().getSize()), (item == null ? null : CraftItemStack.createNMSItemStack(item)));
+            getMatrixInventory().setItem((index - getResultInventory().getSize()), (item == null ? null : CraftItemStack.asNMSCopy(item)));
         }
     }
 
@@ -89,7 +89,7 @@ public class CraftInventoryCrafting extends CraftInventory implements CraftingIn
         net.minecraft.server.ItemStack[] matrix = getMatrixInventory().getContents();
 
         for (int i = 0; i < matrix.length; i++ ) {
-            items[i] = new CraftItemStack(matrix[i]);
+            items[i] = CraftItemStack.asCraftMirror(matrix[i]);
         }
 
         return items;
@@ -97,7 +97,7 @@ public class CraftInventoryCrafting extends CraftInventory implements CraftingIn
 
     public ItemStack getResult() {
         net.minecraft.server.ItemStack item = getResultInventory().getItem(0);
-        if(item != null) return new CraftItemStack(item);
+        if(item != null) return CraftItemStack.asCraftMirror(item);
         return null;
     }
 
@@ -114,7 +114,7 @@ public class CraftInventoryCrafting extends CraftInventory implements CraftingIn
                 if (item == null || item.getTypeId() <= 0) {
                     mcItems[i] = null;
                 } else {
-                    mcItems[i] = CraftItemStack.createNMSItemStack(item);
+                    mcItems[i] = CraftItemStack.asNMSCopy(item);
                 }
             } else {
                 mcItems[i] = null;
@@ -127,7 +127,7 @@ public class CraftInventoryCrafting extends CraftInventory implements CraftingIn
         if (item == null || item.getTypeId() <= 0) {
             contents[0] = null;
         } else {
-            contents[0] = CraftItemStack.createNMSItemStack(item);
+            contents[0] = CraftItemStack.asNMSCopy(item);
         }
     }
 

src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryCustom.java

@@ -66,7 +66,7 @@ public class CraftInventoryCustom extends CraftInventory {
                 this.setItem(i, null);
                 result = stack;
             } else {
-                result = new ItemStack(stack.id, j, stack.getData(), stack.getEnchantments());
+                result = CraftItemStack.copyNMSStack(stack, j);
                 stack.count -= j;
             }
             this.update();
@@ -81,7 +81,7 @@ public class CraftInventoryCustom extends CraftInventory {
                 this.setItem(i, null);
                 result = stack;
             } else {
-                result = new ItemStack(stack.id, 1, stack.getData(), stack.getEnchantments());
+                result = CraftItemStack.copyNMSStack(stack, 1);
                 stack.count -= 1;
             }
             return result;

src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryPlayer.java

@@ -22,7 +22,7 @@ public class CraftInventoryPlayer extends CraftInventory implements org.bukkit.i
     }
 
     public ItemStack getItemInHand() {
-        return new CraftItemStack(getInventory().getItemInHand());
+        return CraftItemStack.asCraftMirror(getInventory().getItemInHand());
     }
 
     public void setItemInHand(ItemStack stack) {
@@ -70,7 +70,7 @@ public class CraftInventoryPlayer extends CraftInventory implements org.bukkit.i
         ItemStack[] ret = new ItemStack[mcItems.length];
 
         for (int i = 0; i < mcItems.length; i++) {
-            ret[i] = new CraftItemStack(mcItems[i]);
+            ret[i] = CraftItemStack.asCraftMirror(mcItems[i]);
         }
         return ret;
     }

src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryView.java

@@ -49,7 +49,7 @@ public class CraftInventoryView extends InventoryView {
 
     @Override
     public void setItem(int slot, ItemStack item) {
-        net.minecraft.server.ItemStack stack = CraftItemStack.createNMSItemStack(item);
+        net.minecraft.server.ItemStack stack = CraftItemStack.asNMSCopy(item);
         if (slot != -999) {
             container.getSlot(slot).set(stack);
         } else {
@@ -62,7 +62,7 @@ public class CraftInventoryView extends InventoryView {
         if (slot == -999) {
             return null;
         }
-        return new CraftItemStack(container.getSlot(slot).getItem());
+        return CraftItemStack.asCraftMirror(container.getSlot(slot).getItem());
     }
 
     public boolean isInTop(int rawSlot) {

src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java

@@ -0,0 +1,123 @@
+package org.bukkit.craftbukkit.inventory;
+
+
+import org.apache.commons.lang.Validate;
+import org.bukkit.Color;
+import org.bukkit.Material;
+import org.bukkit.configuration.serialization.ConfigurationSerialization;
+import org.bukkit.inventory.ItemFactory;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
+
+public final class CraftItemFactory implements ItemFactory {
+    static final Color DEFAULT_LEATHER_COLOR = Color.fromRGB(0xA06540);
+    private static final CraftItemFactory instance;
+
+    static {
+        instance = new CraftItemFactory();
+        ConfigurationSerialization.registerClass(CraftMetaItem.SerializableMeta.class);
+    }
+
+    private CraftItemFactory() {
+    }
+
+    public boolean isApplicable(ItemMeta meta, ItemStack itemstack) {
+        if (itemstack == null) {
+            return false;
+        }
+        return isApplicable(meta, itemstack.getType());
+    }
+
+    public boolean isApplicable(ItemMeta meta, Material type) {
+        if (type == null || meta == null) {
+            return false;
+        }
+        if (!(meta instanceof CraftMetaItem)) {
+            throw new IllegalArgumentException("Meta of " + meta.getClass().toString() + " not created by " + CraftItemFactory.class.getName());
+        }
+
+        return ((CraftMetaItem) meta).applicableTo(type);
+    }
+
+    public ItemMeta getItemMeta(Material material) {
+        Validate.notNull(material, "Material cannot be null");
+        return getItemMeta(material, null);
+    }
+
+    private ItemMeta getItemMeta(Material material, CraftMetaItem meta) {
+        switch (material) {
+        case AIR:
+            return null;
+        case WRITTEN_BOOK:
+        case BOOK_AND_QUILL:
+            return meta instanceof CraftMetaBook ? meta : new CraftMetaBook(meta);
+        case SKULL_ITEM:
+            return meta instanceof CraftMetaSkull ? meta : new CraftMetaSkull(meta);
+        case LEATHER_HELMET:
+        case LEATHER_CHESTPLATE:
+        case LEATHER_LEGGINGS:
+        case LEATHER_BOOTS:
+            return meta instanceof CraftMetaLeatherArmor ? meta : new CraftMetaLeatherArmor(meta);
+        case POTION:
+            return meta instanceof CraftMetaPotion ? meta : new CraftMetaPotion(meta);
+        case MAP:
+            return meta instanceof CraftMetaMap ? meta : new CraftMetaMap(meta);
+        default:
+            return new CraftMetaItem(meta);
+        }
+    }
+
+    public boolean equals(ItemMeta meta1, ItemMeta meta2) {
+        if (meta1 == meta2) {
+            return true;
+        }
+        if (meta1 != null && !(meta1 instanceof CraftMetaItem)) {
+            throw new IllegalArgumentException("First meta of " + meta1.getClass().getName() + " does not belong to " + CraftItemFactory.class.getName());
+        }
+        if (meta2 != null && !(meta2 instanceof CraftMetaItem)) {
+            throw new IllegalArgumentException("Second meta " + meta2.getClass().getName() + " does not belong to " + CraftItemFactory.class.getName());
+        }
+        if (meta1 == null) {
+            return ((CraftMetaItem) meta2).isEmpty();
+        }
+        if (meta2 == null) {
+            return ((CraftMetaItem) meta1).isEmpty();
+        }
+
+        return equals((CraftMetaItem) meta1, (CraftMetaItem) meta2);
+    }
+
+    boolean equals(CraftMetaItem meta1, CraftMetaItem meta2) {
+        /*
+         * This couldn't be done inside of the objects themselves, else force recursion.
+         * This is a fairly clean way of implementing it, by dividing the methods into purposes and letting each method perform its own function.
+         *
+         * The common and uncommon were split, as both could have variables not applicable to the other, like a skull and book.
+         * Each object needs its chance to say "hey wait a minute, we're not equal," but without the redundancy of using the 1.equals(2) && 2.equals(1) checking the 'commons' twice.
+         *
+         * Doing it this way fills all conditions of the .equals() method.
+         */
+        return meta1.equalsCommon(meta2) && meta1.notUncommon(meta2) && meta2.notUncommon(meta1);
+    }
+
+    public static CraftItemFactory instance() {
+        return instance;
+    }
+
+    public ItemMeta asMetaFor(ItemMeta meta, ItemStack stack) {
+        Validate.notNull(stack, "Stack cannot be null");
+        return asMetaFor(meta, stack.getType());
+    }
+
+    public ItemMeta asMetaFor(ItemMeta meta, Material material) {
+        Validate.notNull(material, "Material cannot be null");
+        if (!(meta instanceof CraftMetaItem)) {
+            throw new IllegalArgumentException("Meta of " + (meta != null ? meta.getClass().toString() : "null") + " not created by " + CraftItemFactory.class.getName());
+        }
+        return getItemMeta(material, (CraftMetaItem) meta);
+    }
+
+    public Color getDefaultLeatherColor() {
+        return DEFAULT_LEATHER_COLOR;
+    }
+}

src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java

@@ -1,134 +1,150 @@
 package org.bukkit.craftbukkit.inventory;
 
-import java.util.HashMap;
 import java.util.Map;
+
 import net.minecraft.server.EnchantmentManager;
 import net.minecraft.server.NBTTagCompound;
 import net.minecraft.server.NBTTagList;
+
+import org.apache.commons.lang.Validate;
 import org.bukkit.enchantments.Enchantment;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.Material;
 import org.bukkit.configuration.serialization.DelegateDeserialization;
+import org.bukkit.inventory.meta.ItemMeta;
+
+import com.google.common.collect.ImmutableMap;
 
 @DelegateDeserialization(ItemStack.class)
-public class CraftItemStack extends ItemStack {
-    protected net.minecraft.server.ItemStack item;
+public final class CraftItemStack extends ItemStack {
 
-    public CraftItemStack(net.minecraft.server.ItemStack item) {
-        super(
-            item != null ? item.id: 0,
-            item != null ? item.count : 0,
-            (short)(item != null ? item.getData() : 0)
-        );
-        this.item = item;
+    public static net.minecraft.server.ItemStack asNMSCopy(ItemStack original) {
+        if (original instanceof CraftItemStack) {
+            CraftItemStack stack = (CraftItemStack) original;
+            return stack.handle == null ? null : stack.handle.cloneItemStack();
+        }
+        if (original == null || original.getTypeId() <= 0) {
+            return null;
+        }
+        net.minecraft.server.ItemStack stack = new net.minecraft.server.ItemStack(original.getTypeId(), original.getAmount(), original.getDurability());
+        if (original.hasItemMeta()) {
+            setItemMeta(stack, original.getItemMeta());
+        }
+        return stack;
     }
 
-    public CraftItemStack(ItemStack item) {
-        this(item.getTypeId(), item.getAmount(), item.getDurability());
-        addUnsafeEnchantments(item.getEnchantments());
+    public static net.minecraft.server.ItemStack copyNMSStack(net.minecraft.server.ItemStack original, int amount) {
+        net.minecraft.server.ItemStack stack = original.cloneItemStack();
+        stack.count = amount;
+        return stack;
     }
 
-    /* 'Overwritten' constructors from ItemStack, yay for Java sucking */
-    public CraftItemStack(final int type) {
-        this(type, 1);
-    }
-
-    public CraftItemStack(final Material type) {
-        this(type, 1);
-    }
-
-    public CraftItemStack(final int type, final int amount) {
-        this(type, amount, (byte) 0);
-    }
-
-    public CraftItemStack(final Material type, final int amount) {
-        this(type.getId(), amount);
-    }
-
-    public CraftItemStack(final int type, final int amount, final short damage) {
-        this(type, amount, damage, null);
-    }
-
-    public CraftItemStack(final Material type, final int amount, final short damage) {
-        this(type.getId(), amount, damage);
-    }
-
-    public CraftItemStack(final Material type, final int amount, final short damage, final Byte data) {
-        this(type.getId(), amount, damage, data);
-    }
-
-    public CraftItemStack(int type, int amount, short damage, Byte data) {
-        this(new net.minecraft.server.ItemStack(type, amount, data != null ? data : damage));
-    }
-
-    /*
-     * Unsure if we have to sync before each of these calls the values in 'item'
-     * are all public.
+    /**
+     * Copies the NMS stack to return as a strictly-Bukkit stack
      */
+    public static ItemStack asBukkitCopy(net.minecraft.server.ItemStack original) {
+        if (original == null) {
+            return new ItemStack(Material.AIR);
+        }
+        ItemStack stack = new ItemStack(original.id, original.count, (short) original.getData());
+        if (hasItemMeta(original)) {
+            stack.setItemMeta(getItemMeta(original));
+        }
+        return stack;
+    }
 
-    @Override
-    public Material getType() {
-        super.setTypeId(item != null ? item.id : 0); // sync, needed?
-        return super.getType();
+    public static CraftItemStack asCraftMirror(net.minecraft.server.ItemStack original) {
+        return new CraftItemStack(original);
+    }
+
+    public static CraftItemStack asCraftCopy(ItemStack original) {
+        if (original instanceof CraftItemStack) {
+            CraftItemStack stack = (CraftItemStack) original;
+            return new CraftItemStack(stack.handle == null ? null : stack.handle.cloneItemStack());
+        }
+        return new CraftItemStack(original);
+    }
+
+    public static CraftItemStack asNewCraftStack(net.minecraft.server.Item item) {
+        return asNewCraftStack(item, 1);
+    }
+
+    public static CraftItemStack asNewCraftStack(net.minecraft.server.Item item, int amount) {
+        return new CraftItemStack(item.id, amount, (short) 0, null);
+    }
+
+    net.minecraft.server.ItemStack handle;
+
+    /**
+     * Mirror
+     */
+    private CraftItemStack(net.minecraft.server.ItemStack item) {
+        this.handle = item;
+    }
+
+    private CraftItemStack(ItemStack item) {
+        this(item.getTypeId(), item.getAmount(), item.getDurability(), item.hasItemMeta() ? item.getItemMeta() : null);
+    }
+
+    private CraftItemStack(int typeId, int amount, short durability, ItemMeta itemMeta) {
+        setTypeId(typeId);
+        setAmount(amount);
+        setDurability(durability);
+        setItemMeta(itemMeta);
     }
 
     @Override
     public int getTypeId() {
-        super.setTypeId(item != null ? item.id : 0); // sync, needed?
-        return item != null ? item.id : 0;
+        return handle != null ? handle.id : 0;
     }
 
     @Override
     public void setTypeId(int type) {
-        if (type == 0) {
-            super.setTypeId(0);
-            super.setAmount(0);
-            item = null;
+        if (getTypeId() == type) {
+            return;
+        } else if (type == 0) {
+            handle = null;
+        } else if (handle == null) {
+            handle = new net.minecraft.server.ItemStack(type, 1, 0);
         } else {
-            if (item == null) {
-                item = new net.minecraft.server.ItemStack(type, 1, 0);
-                super.setTypeId(type);
-                super.setAmount(1);
-                super.setDurability((short) 0);
-            } else {
-                item.id = type;
-                super.setTypeId(item.id);
+            handle.id = type;
+            if (hasItemMeta()) {
+                // This will create the appropriate item meta, which will contain all the data we intend to keep
+                setItemMeta(handle, getItemMeta(handle));
             }
         }
+        setData(null);
     }
 
     @Override
     public int getAmount() {
-        super.setAmount(item != null ? item.count : 0); // sync, needed?
-        return (item != null ? item.count : 0);
+        return handle != null ? handle.count : 0;
     }
 
     @Override
     public void setAmount(int amount) {
+        if (handle == null) {
+            return;
+        }
         if (amount == 0) {
-            super.setTypeId(0);
-            super.setAmount(0);
-            item = null;
+            handle = null;
         } else {
-            super.setAmount(amount);
-            item.count = amount;
+            handle.count = amount;
         }
     }
 
     @Override
     public void setDurability(final short durability) {
         // Ignore damage if item is null
-        if (item != null) {
-            super.setDurability(durability);
-            item.setData(durability);
+        if (handle != null) {
+            handle.setData(durability);
         }
     }
 
     @Override
     public short getDurability() {
-        if (item != null) {
-            super.setDurability((short) item.getData()); // sync, needed?
-            return (short) item.getData();
+        if (handle != null) {
+            return (short) handle.getData();
         } else {
             return -1;
         }
@@ -136,14 +152,46 @@ public class CraftItemStack extends ItemStack {
 
     @Override
     public int getMaxStackSize() {
-        return (item == null) ? 0 : item.getItem().getMaxStackSize();
+        return (handle == null) ? Material.AIR.getMaxStackSize() : handle.getItem().getMaxStackSize();
     }
 
     @Override
     public void addUnsafeEnchantment(Enchantment ench, int level) {
-        Map<Enchantment, Integer> enchantments = getEnchantments();
-        enchantments.put(ench, level);
-        rebuildEnchantments(enchantments);
+        Validate.notNull(ench, "Cannot add null enchantment");
+
+        if (!makeTag(handle)) {
+            return;
+        }
+        NBTTagList list = getEnchantmentList(handle), listCopy;
+        if (list == null) {
+            list = new NBTTagList("ench");
+            handle.tag.set("ench", list);
+        }
+        int size = list.size();
+
+        for (int i = 0; i < size; i++) {
+            NBTTagCompound tag = (NBTTagCompound) list.get(i);
+            short id = tag.getShort("id");
+            if (id == ench.getId()) {
+                tag.setShort("lvl", (short) level);
+                return;
+            }
+        }
+        NBTTagCompound tag = new NBTTagCompound();
+        tag.setShort("id", (short) ench.getId());
+        tag.setShort("lvl", (short) level);
+        list.add(tag);
+    }
+
+    static boolean makeTag(net.minecraft.server.ItemStack item) {
+        if (item == null) {
+            return false;
+        }
+        if (item.tag != null) {
+            return true;
+        }
+        item.tag = new NBTTagCompound();
+        return true;
     }
 
     @Override
@@ -153,31 +201,65 @@ public class CraftItemStack extends ItemStack {
 
     @Override
     public int getEnchantmentLevel(Enchantment ench) {
-        if (item == null) return 0;
-        return EnchantmentManager.getEnchantmentLevel(ench.getId(), item);
+        Validate.notNull(ench, "Cannot find null enchantment");
+        if (handle == null) {
+            return 0;
+        }
+        return EnchantmentManager.getEnchantmentLevel(ench.getId(), handle);
     }
 
     @Override
     public int removeEnchantment(Enchantment ench) {
-        Map<Enchantment, Integer> enchantments = getEnchantments();
-        Integer previous = enchantments.remove(ench);
+        Validate.notNull(ench, "Cannot remove null enchantment");
 
-        rebuildEnchantments(enchantments);
+        NBTTagList list = getEnchantmentList(handle), listCopy;
+        if (list == null) {
+            return 0;
+        }
+        int index = Integer.MIN_VALUE, size = list.size(), level;
 
-        return (previous == null) ? 0 : previous;
+        for (int i = 0; i < size; i++) {
+            short id = ((NBTTagCompound) list.get(i)).getShort("id");
+            if (id == ench.getId()) {
+                index = i;
+                break;
+            }
+        }
+
+        if (index == Integer.MIN_VALUE) {
+            return 0;
+        }
+        if (index == 0 && size == 0) {
+            handle.tag.o("ench");
+            if (handle.tag.d()) {
+                handle.tag = null;
+            }
+        }
+
+        listCopy = new NBTTagList("ench");
+        level = Integer.MAX_VALUE;
+        for (int i = 0; i < size; i++) {
+            if (i == index) {
+                level = ((NBTTagCompound) list.get(i)).getShort("id");
+                continue;
+            }
+            listCopy.add(list.get(i));
+        }
+        handle.tag.set("ench", listCopy);
+        return level;
     }
 
     @Override
     public Map<Enchantment, Integer> getEnchantments() {
-        return getEnchantments(item);
+        return getEnchantments(handle);
     }
 
-    public static Map<Enchantment, Integer> getEnchantments(net.minecraft.server.ItemStack item) {
-        Map<Enchantment, Integer> result = new HashMap<Enchantment, Integer>();
+    static Map<Enchantment, Integer> getEnchantments(net.minecraft.server.ItemStack item) {
+        ImmutableMap.Builder<Enchantment, Integer> result = ImmutableMap.builder();
         NBTTagList list = (item == null) ? null : item.getEnchantments();
 
         if (list == null) {
-            return result;
+            return result.build();
         }
 
         for (int i = 0; i < list.size(); i++) {
@@ -187,66 +269,111 @@ public class CraftItemStack extends ItemStack {
             result.put(Enchantment.getById(id), (int) level);
         }
 
-        return result;
+        return result.build();
     }
 
-    private void rebuildEnchantments(Map<Enchantment, Integer> enchantments) {
-        if (item == null) return;
-
-        NBTTagCompound tag = item.tag;
-        NBTTagList list = new NBTTagList("ench");
-
-        if (tag == null) {
-            tag = item.tag = new NBTTagCompound();
-        }
-
-        for (Map.Entry<Enchantment, Integer> entry : enchantments.entrySet()) {
-            NBTTagCompound subtag = new NBTTagCompound();
-
-            subtag.setShort("id", (short) entry.getKey().getId());
-            subtag.setShort("lvl", (short) (int) entry.getValue());
-
-            list.add(subtag);
-        }
-
-        if (enchantments.isEmpty()) {
-            tag.remove("ench");
-        } else {
-            tag.set("ench", list);
-        }
-    }
-
-    public net.minecraft.server.ItemStack getHandle() {
-        return item;
+    static NBTTagList getEnchantmentList(net.minecraft.server.ItemStack item) {
+        return item == null ? null : item.getEnchantments();
     }
 
     @Override
     public CraftItemStack clone() {
         CraftItemStack itemStack = (CraftItemStack) super.clone();
-        if (this.item != null) {
-            itemStack.item = this.item.cloneItemStack();
+        if (this.handle != null) {
+            itemStack.handle = this.handle.cloneItemStack();
         }
         return itemStack;
     }
 
-    public static net.minecraft.server.ItemStack createNMSItemStack(ItemStack original) {
-        if (original == null || original.getTypeId() <= 0) {
-            return null;
-        } else if (original instanceof CraftItemStack) {
-            return ((CraftItemStack) original).getHandle();
-        }
-        return new CraftItemStack(original).getHandle();
+    @Override
+    public ItemMeta getItemMeta() {
+        return getItemMeta(handle);
     }
 
-    /**
-     * Copies the NMS stack to return as a strictly-Bukkit stack
-     */
-    public static ItemStack asBukkitStack(net.minecraft.server.ItemStack original) {
-        if (original == null) {
-            return new ItemStack(Material.AIR);
+    static ItemMeta getItemMeta(net.minecraft.server.ItemStack item) {
+        if (!hasItemMeta(item)) {
+            return CraftItemFactory.instance().getItemMeta(getType(item));
         }
-        ItemStack stack = new ItemStack(original.id, original.count, (short) original.getData());
-        stack.addUnsafeEnchantments(getEnchantments(original));
-        return stack;
+        switch (getType(item)) {
+            case WRITTEN_BOOK:
+            case BOOK_AND_QUILL:
+                return new CraftMetaBook(item.tag);
+            case SKULL_ITEM:
+                return new CraftMetaSkull(item.tag);
+            case LEATHER_HELMET:
+            case LEATHER_CHESTPLATE:
+            case LEATHER_LEGGINGS:
+            case LEATHER_BOOTS:
+                return new CraftMetaLeatherArmor(item.tag);
+            case POTION:
+                return new CraftMetaPotion(item.tag);
+            case MAP:
+                return new CraftMetaMap(item.tag);
+            default:
+                return new CraftMetaItem(item.tag);
+        }
+    }
+
+    static Material getType(net.minecraft.server.ItemStack item) {
+        Material material = Material.getMaterial(item == null ? 0 : item.id);
+        return material == null ? Material.AIR : material;
+    }
+
+    @Override
+    public boolean setItemMeta(ItemMeta itemMeta) {
+        return setItemMeta(handle, itemMeta);
+    }
+
+    static boolean setItemMeta(net.minecraft.server.ItemStack item, ItemMeta itemMeta) {
+        if (item == null) {
+            return false;
+        }
+        if (itemMeta == null) {
+            item.tag = null;
+            return true;
+        }
+        if (!CraftItemFactory.instance().isApplicable(itemMeta, getType(item))) {
+            return false;
+        }
+
+        NBTTagCompound tag = new NBTTagCompound();
+        item.setTag(tag);
+
+        ((CraftMetaItem) itemMeta).applyToItem(tag);
+        return true;
+    }
+
+    @Override
+    public boolean isSimilar(ItemStack stack) {
+        if (stack == null) {
+            return false;
+        }
+        if (stack == this) {
+            return true;
+        }
+        if (!(stack instanceof CraftItemStack)) {
+            return stack.getClass() == ItemStack.class && stack.isSimilar(this);
+        }
+
+        CraftItemStack that = (CraftItemStack) stack;
+        if (handle == that.handle) {
+            return true;
+        }
+        if (handle == null || that.handle == null) {
+            return false;
+        }
+        if (!(that.getTypeId() == getTypeId() && getDurability() == that.getDurability())) {
+            return false;
+        }
+        return hasItemMeta() ? that.hasItemMeta() && handle.tag.equals(that.handle.tag) : !that.hasItemMeta();
+    }
+
+    @Override
+    public boolean hasItemMeta() {
+        return hasItemMeta(handle);
+    }
+
+    static boolean hasItemMeta(net.minecraft.server.ItemStack item) {
+        return !(item == null || item.tag == null || item.tag.d());
     }
 }

src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java

@@ -0,0 +1,272 @@
+package org.bukkit.craftbukkit.inventory;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+
+import net.minecraft.server.NBTTagCompound;
+import net.minecraft.server.NBTTagList;
+import net.minecraft.server.NBTTagString;
+
+import org.apache.commons.lang.Validate;
+import org.bukkit.Material;
+import org.bukkit.configuration.serialization.DelegateDeserialization;
+import org.bukkit.craftbukkit.inventory.CraftMetaItem.SerializableMeta;
+import org.bukkit.inventory.meta.BookMeta;
+
+import com.google.common.base.Strings;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap.Builder;
+
+@DelegateDeserialization(SerializableMeta.class)
+class CraftMetaBook extends CraftMetaItem implements BookMeta {
+    static final ItemMetaKey BOOK_TITLE = new ItemMetaKey("title");
+    static final ItemMetaKey BOOK_AUTHOR = new ItemMetaKey("author");
+    static final ItemMetaKey BOOK_PAGES = new ItemMetaKey("pages");
+    static final int MAX_PAGE_LENGTH = 256;
+    static final int MAX_TITLE_LENGTH = 0xffff;
+
+    private String title;
+    private String author;
+    private List<String> pages = new ArrayList<String>();
+
+    CraftMetaBook(CraftMetaItem meta) {
+        super(meta);
+
+        if (!(meta instanceof CraftMetaBook)) {
+            return;
+        }
+        CraftMetaBook bookMeta = (CraftMetaBook) meta;
+        this.title = bookMeta.title;
+        this.author = bookMeta.author;
+        pages.addAll(bookMeta.pages);
+    }
+
+    CraftMetaBook(NBTTagCompound tag) {
+        super(tag);
+
+        if (tag.hasKey(BOOK_TITLE.NBT)) {
+            this.title = tag.getString(BOOK_TITLE.NBT);
+        }
+
+        if (tag.hasKey(BOOK_AUTHOR.NBT)) {
+            this.author = tag.getString(BOOK_AUTHOR.NBT);
+        }
+
+        if (tag.hasKey(BOOK_PAGES.NBT)) {
+            NBTTagList pages = tag.getList(BOOK_PAGES.NBT);
+            String[] pageArray = new String[pages.size()];
+
+            for (int i = 0; i < pages.size(); i++) {
+                String page = ((NBTTagString) pages.get(i)).data;
+                pageArray[i] = page;
+            }
+
+            addPage(pageArray);
+        }
+    }
+
+    CraftMetaBook(Map<String, Object> map) {
+        super(map);
+
+        setAuthor(SerializableMeta.getString(map, BOOK_AUTHOR.BUKKIT, true));
+
+        setTitle(SerializableMeta.getString(map, BOOK_TITLE.BUKKIT, true));
+
+        Collection<?> pages = SerializableMeta.getObject(Collection.class, map, BOOK_PAGES.BUKKIT, true);
+        CraftMetaItem.safelyAdd(pages, this.pages, MAX_PAGE_LENGTH);
+    }
+
+    @Override
+    void applyToItem(NBTTagCompound itemData) {
+        super.applyToItem(itemData);
+
+        if (hasTitle()) {
+            itemData.setString(BOOK_TITLE.NBT, this.title);
+        }
+
+        if (hasAuthor()) {
+            itemData.setString(BOOK_AUTHOR.NBT, this.author);
+        }
+
+        if (hasPages()) {
+            NBTTagList itemPages = new NBTTagList(BOOK_PAGES.NBT);
+            for (int i = 1; i < pages.size() + 1; i++) {
+                itemPages.add(new NBTTagString(String.valueOf(i), pages.get(i - 1)));
+            }
+            itemData.set(BOOK_PAGES.NBT, itemPages);
+        }
+    }
+
+    @Override
+    boolean isEmpty() {
+        return super.isEmpty() && isBookEmpty();
+    }
+
+    boolean isBookEmpty() {
+        return !(hasPages() || hasAuthor() || hasTitle());
+    }
+
+    @Override
+    boolean applicableTo(Material type) {
+        switch (type) {
+        case WRITTEN_BOOK:
+        case BOOK_AND_QUILL:
+            return true;
+        default:
+            return false;
+        }
+    }
+
+    public boolean hasAuthor() {
+        return !Strings.isNullOrEmpty(author);
+    }
+
+    public boolean hasTitle() {
+        return !Strings.isNullOrEmpty(title);
+    }
+
+    public boolean hasPages() {
+        return !pages.isEmpty();
+    }
+
+    public String getTitle() {
+        return this.title;
+    }
+
+    public boolean setTitle(final String title) {
+        if (title == null) {
+            this.title = null;
+            return true;
+        } else if (title.length() > MAX_TITLE_LENGTH) {
+            return false;
+        }
+
+        this.title = title;
+        return true;
+    }
+
+    public String getAuthor() {
+        return this.author;
+    }
+
+    public void setAuthor(final String author) {
+        this.author = author;
+    }
+
+    public String getPage(final int page) {
+        Validate.isTrue(isValidPage(page), "Invalid page number");
+        return pages.get(page - 1);
+    }
+
+    public void setPage(final int page, final String text) {
+        if (!isValidPage(page)) {
+            throw new IllegalArgumentException("Invalid page number " + page + "/" + pages.size());
+        }
+
+        pages.set(page - 1, text == null ? "" : text.length() > MAX_PAGE_LENGTH ? text.substring(0, MAX_PAGE_LENGTH) : text);
+    }
+
+    public void setPages(final String... pages) {
+        this.pages.clear();
+
+        addPage(pages);
+    }
+
+    public void addPage(final String... pages) {
+        for (String page : pages) {
+            if (page == null) {
+                page = "";
+            } else if (page.length() > MAX_PAGE_LENGTH) {
+                page = page.substring(0, MAX_PAGE_LENGTH);
+            }
+
+            this.pages.add(page);
+        }
+    }
+
+    public int getPageCount() {
+        return pages.size();
+    }
+
+    public List<String> getPages() {
+        return ImmutableList.copyOf(pages);
+    }
+
+    public void setPages(List<String> pages) {
+        this.pages.clear();
+        CraftMetaItem.safelyAdd(pages, this.pages, MAX_PAGE_LENGTH);
+    }
+
+    private boolean isValidPage(int page) {
+        return page > 0 && page <= pages.size();
+    }
+
+    @Override
+    public CraftMetaBook clone() {
+        CraftMetaBook meta = (CraftMetaBook) super.clone();
+        meta.pages = new ArrayList<String>(pages);
+        return meta;
+    }
+
+    @Override
+    int applyHash() {
+        final int original;
+        int hash = original = super.applyHash();
+        if (hasTitle()) {
+            hash = 61 * hash + this.title.hashCode();
+        }
+        if (hasAuthor()) {
+            hash = 61 * hash + 13 * this.author.hashCode();
+        }
+        if (hasPages()) {
+            hash = 61 * hash + 17 * this.pages.hashCode();
+        }
+        return original != hash ? CraftMetaBook.class.hashCode() ^ hash : hash;
+    }
+
+    @Override
+    boolean equalsCommon(CraftMetaItem meta) {
+        if (!super.equalsCommon(meta)) {
+            return false;
+        }
+        if (meta instanceof CraftMetaBook) {
+            CraftMetaBook that = (CraftMetaBook) meta;
+
+            return (hasTitle() ? that.hasTitle() && this.title.equals(that.title) : !that.hasTitle())
+                    && (hasAuthor() ? that.hasAuthor() && this.author.equals(that.author) : !that.hasAuthor())
+                    && (hasPages() ? that.hasPages() && this.pages.equals(that.pages) : !that.hasPages());
+        }
+        return true;
+    }
+
+    @Override
+    boolean notUncommon(CraftMetaItem meta) {
+        return super.notUncommon(meta) && (meta instanceof CraftMetaBook || isBookEmpty());
+    }
+
+    @Override
+    Builder<String, Object> serialize(Builder<String, Object> builder) {
+        super.serialize(builder);
+
+        if (hasTitle()) {
+            builder.put(BOOK_TITLE.BUKKIT, title);
+        }
+
+        if (hasAuthor()) {
+            builder.put(BOOK_AUTHOR.BUKKIT, author);
+        }
+
+        if (hasPages()) {
+            builder.put(BOOK_PAGES.BUKKIT, pages);
+        }
+
+        return builder;
+    }
+
+    @Override
+    SerializableMeta.Deserializers deserializer() {
+        return SerializableMeta.Deserializers.BOOK;
+    }
+}

src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java

@@ -0,0 +1,510 @@
+package org.bukkit.craftbukkit.inventory;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.NoSuchElementException;
+
+import net.minecraft.server.NBTBase;
+import net.minecraft.server.NBTTagCompound;
+import net.minecraft.server.NBTTagList;
+import net.minecraft.server.NBTTagString;
+
+import org.apache.commons.lang.Validate;
+import org.bukkit.Material;
+import org.bukkit.configuration.serialization.ConfigurationSerializable;
+import org.bukkit.configuration.serialization.DelegateDeserialization;
+import org.bukkit.configuration.serialization.SerializableAs;
+import org.bukkit.craftbukkit.Overridden;
+import org.bukkit.enchantments.Enchantment;
+import org.bukkit.inventory.meta.ItemMeta;
+import org.bukkit.inventory.meta.Repairable;
+
+import com.google.common.base.Strings;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+
+/**
+ * Children must include the following:
+ *
+ * <li> Constructor(CraftMetaItem meta)
+ * <li> Constructor(NBTTagCompound tag)
+ * <li> Constructor(Map<String, Object> map)
+ * <br><br>
+ * <li> void applyToItem(NBTTagCompound tag)
+ * <li> boolean applicableTo(Material type)
+ * <br><br>
+ * <li> boolean notUncommon(CraftMetaItem meta)
+ * <li> boolean equalsCommon(CraftMetaItem meta)
+ * <br><br>
+ * <li> boolean isEmpty()
+ * <li> boolean is{Type}Empty()
+ * <br><br>
+ * <li> int applyHash()
+ * <li> public Class clone()
+ * <br><br>
+ * <li> Builder<String, Object> serialize(Builder<String, Object> builder)
+ * <li> SerializableMeta.Deserializers deserializer()
+ */
+@DelegateDeserialization(CraftMetaItem.SerializableMeta.class)
+class CraftMetaItem implements ItemMeta, Repairable {
+    static class ItemMetaKey {
+        final String BUKKIT;
+        final String NBT;
+
+        ItemMetaKey(final String both) {
+            this(both, both);
+        }
+
+        ItemMetaKey(final String nbt, final String bukkit) {
+            this.NBT = nbt;
+            this.BUKKIT = bukkit;
+        }
+    }
+
+    @SerializableAs("ItemMeta")
+    public static class SerializableMeta implements ConfigurationSerializable {
+        static final String TYPE_FIELD = "meta-type";
+
+        enum Deserializers {
+            BOOK {
+                @Override
+                CraftMetaBook deserialize(Map<String, Object> map) {
+                    return new CraftMetaBook(map);
+                }
+            },
+            SKULL {
+                @Override
+                CraftMetaSkull deserialize(Map<String, Object> map) {
+                    return new CraftMetaSkull(map);
+                }
+            },
+            LEATHER_ARMOR {
+                @Override
+                CraftMetaLeatherArmor deserialize(Map<String, Object> map) {
+                    return new CraftMetaLeatherArmor(map);
+                }
+            },
+            MAP {
+                @Override
+                CraftMetaMap deserialize(Map<String, Object> map) {
+                    return new CraftMetaMap(map);
+                }
+            },
+            POTION {
+                @Override
+                CraftMetaPotion deserialize(Map<String, Object> map) {
+                    return new CraftMetaPotion(map);
+                }
+            },
+            UNSPECIFIC {
+                @Override
+                CraftMetaItem deserialize(Map<String, Object> map) {
+                    return new CraftMetaItem(map);
+                }
+            };
+
+            abstract CraftMetaItem deserialize(Map<String, Object> map);
+        }
+
+        private SerializableMeta() {
+        }
+
+        public static ItemMeta deserialize(Map<String, Object> map) {
+            Validate.notNull(map, "Cannot deserialize null map");
+
+            String type = getString(map, TYPE_FIELD, false);
+            Deserializers deserializer = Deserializers.valueOf(type);
+
+            if (deserializer == null) {
+                throw new IllegalArgumentException(type + " is not a valid " + TYPE_FIELD);
+            }
+
+            return deserializer.deserialize(map);
+        }
+
+        public Map<String, Object> serialize() {
+            throw new AssertionError();
+        }
+
+        static String getString(Map<?, ?> map, Object field, boolean nullable) {
+            return getObject(String.class, map, field, nullable);
+        }
+
+        static boolean getBoolean(Map<?, ?> map, Object field) {
+            Boolean value = getObject(Boolean.class, map, field, true);
+            return value != null && value;
+        }
+
+        static <T> T getObject(Class<T> clazz, Map<?, ?> map, Object field, boolean nullable) {
+            final Object object = map.get(field);
+
+            if (clazz.isInstance(object)) {
+                return clazz.cast(object);
+            }
+            if (object == null) {
+                if (!nullable) {
+                    throw new NoSuchElementException(map + " does not contain " + field);
+                }
+                return null;
+            }
+            throw new IllegalArgumentException(field + "(" + object + ") is not a valid " + clazz);
+        }
+    }
+
+    static final ItemMetaKey NAME = new ItemMetaKey("Name", "display-name");
+    static final ItemMetaKey DISPLAY = new ItemMetaKey("display");
+    static final ItemMetaKey LORE = new ItemMetaKey("Lore", "lore");
+    static final ItemMetaKey ENCHANTMENTS = new ItemMetaKey("ench", "enchants");
+    static final ItemMetaKey ENCHANTMENTS_ID = new ItemMetaKey("id");
+    static final ItemMetaKey ENCHANTMENTS_LVL = new ItemMetaKey("lvl");
+    static final ItemMetaKey REPAIR = new ItemMetaKey("RepairCost", "repair-cost");
+
+    private String displayName;
+    private List<String> lore;
+    private Map<Enchantment, Integer> enchantments;
+    private int repairCost;
+
+    CraftMetaItem(CraftMetaItem meta) {
+        if (meta == null) {
+            return;
+        }
+
+        this.displayName = meta.displayName;
+
+        if (meta.hasLore()) {
+            this.lore = new ArrayList<String>(meta.lore);
+        }
+
+        if (meta.hasEnchants()) {
+            this.enchantments = new HashMap<Enchantment, Integer>(meta.enchantments);
+        }
+
+        this.repairCost = meta.repairCost;
+    }
+
+    CraftMetaItem(NBTTagCompound tag) {
+        if (tag.hasKey(DISPLAY.NBT)) {
+            NBTTagCompound display = tag.getCompound(DISPLAY.NBT);
+
+            if (display.hasKey(NAME.NBT)) {
+                displayName = display.getString(NAME.NBT);
+            }
+
+            if (display.hasKey(LORE.NBT)) {
+                NBTTagList list = display.getList(LORE.NBT);
+                lore = new ArrayList<String>(list.size());
+
+                for (int index = 0; index < list.size(); index++) {
+                    String line = ((NBTTagString) list.get(index)).data;
+                    lore.add(line);
+                }
+            }
+        }
+
+        if (tag.hasKey(ENCHANTMENTS.NBT)) {
+            NBTTagList ench = tag.getList(ENCHANTMENTS.NBT);
+            enchantments = new HashMap<Enchantment, Integer>(ench.size());
+
+            for (int i = 0; i < ench.size(); i++) {
+                short id = ((NBTTagCompound) ench.get(i)).getShort(ENCHANTMENTS_ID.NBT);
+                short level = ((NBTTagCompound) ench.get(i)).getShort(ENCHANTMENTS_LVL.NBT);
+
+                addEnchant(Enchantment.getById(id), (int) level, true);
+            }
+        }
+
+        if (tag.hasKey(REPAIR.NBT)) {
+            repairCost = tag.getInt(REPAIR.NBT);
+        }
+    }
+
+    CraftMetaItem(Map<String, Object> map) {
+        setDisplayName(SerializableMeta.getString(map, NAME.BUKKIT, true));
+
+        if (map.containsKey(LORE.BUKKIT)) {
+            lore = (List<String>) map.get(LORE.BUKKIT);
+        }
+
+        Map<?, ?> ench = SerializableMeta.getObject(Map.class, map, ENCHANTMENTS.BUKKIT, true);
+        if (ench != null) {
+            enchantments = new HashMap<Enchantment, Integer>(ench.size());
+            for (Map.Entry<?, ?> entry : ench.entrySet()) {
+                Enchantment enchantment = Enchantment.getByName(entry.getKey().toString());
+
+                if ((enchantment != null) && (entry.getValue() instanceof Integer)) {
+                    addEnchant(enchantment, (Integer) entry.getValue(), true);
+                }
+            }
+        }
+
+        if (map.containsKey(REPAIR.BUKKIT)) {
+            repairCost = (Integer) map.get(REPAIR.BUKKIT);
+        }
+    }
+
+    @Overridden
+    void applyToItem(NBTTagCompound itemTag) {
+        if (hasDisplayName()) {
+            setDisplayTag(itemTag, NAME.NBT, new NBTTagString(NAME.NBT, displayName));
+        }
+
+        if (hasLore()) {
+            NBTTagList list = new NBTTagList(LORE.NBT);
+            for (int i = 0; i < lore.size(); i++) {
+                list.add(new NBTTagString(String.valueOf(i), lore.get(i)));
+            }
+            setDisplayTag(itemTag, LORE.NBT, list);
+        }
+
+        if (hasEnchants()) {
+            NBTTagList list = new NBTTagList(ENCHANTMENTS.NBT);
+
+            for (Map.Entry<Enchantment, Integer> entry : enchantments.entrySet()) {
+                NBTTagCompound subtag = new NBTTagCompound();
+
+                subtag.setShort(ENCHANTMENTS_ID.NBT, (short) entry.getKey().getId());
+                subtag.setShort(ENCHANTMENTS_LVL.NBT, (short) (int) entry.getValue());
+
+                list.add(subtag);
+            }
+
+            itemTag.set(ENCHANTMENTS.NBT, list);
+        }
+
+        if (hasRepairCost()) {
+            itemTag.setInt(REPAIR.NBT, repairCost);
+        }
+    }
+
+    void setDisplayTag(NBTTagCompound tag, String key, NBTBase value) {
+        final NBTTagCompound display = tag.getCompound(DISPLAY.NBT);
+
+        if (!tag.hasKey(DISPLAY.NBT)) {
+            tag.setCompound(DISPLAY.NBT, display);
+        }
+
+        display.set(key, value);
+    }
+
+    @Overridden
+    boolean applicableTo(Material type) {
+        return type != Material.AIR;
+    }
+
+    @Overridden
+    boolean isEmpty() {
+        return !(hasDisplayName() || hasEnchants() || hasLore());
+    }
+
+    public String getDisplayName() {
+        return displayName;
+    }
+
+    public final void setDisplayName(String name) {
+        this.displayName = name;
+    }
+
+    public boolean hasDisplayName() {
+        return !Strings.isNullOrEmpty(displayName);
+    }
+
+    public boolean hasLore() {
+        return this.lore != null && !this.lore.isEmpty();
+    }
+
+    public boolean hasRepairCost() {
+        return repairCost > 0;
+    }
+
+    public boolean hasEnchant(Enchantment ench) {
+        return hasEnchants() ? enchantments.containsKey(ench) : false;
+    }
+
+    public int getEnchantLevel(Enchantment ench) {
+        Integer level = hasEnchants() ? enchantments.get(ench) : null;
+        if (level == null) {
+            return 0;
+        }
+        return level;
+    }
+
+    public Map<Enchantment, Integer> getEnchants() {
+        return hasEnchants() ? ImmutableMap.copyOf(enchantments) : ImmutableMap.<Enchantment, Integer>of();
+    }
+
+    public boolean addEnchant(Enchantment ench, int level, boolean ignoreRestrictions) {
+        if (enchantments == null) {
+            enchantments = new HashMap<Enchantment, Integer>(4);
+        }
+
+        if (ignoreRestrictions || level >= ench.getStartLevel() && level <= ench.getMaxLevel()) {
+            Integer old = enchantments.put(ench, level);
+            return old == null || old != level;
+        }
+        return false;
+    }
+
+    public boolean removeEnchant(Enchantment ench) {
+        return hasEnchants() ? enchantments.remove(ench) != null : false;
+    }
+
+    public boolean hasEnchants() {
+        return !(enchantments == null || enchantments.isEmpty());
+    }
+
+    public List<String> getLore() {
+        return this.lore == null ? null : new ArrayList<String>(this.lore);
+    }
+
+    public void setLore(List<String> lore) { // too tired to think if .clone is better
+        if (lore == null) {
+            this.lore = null;
+        } else {
+            if (this.lore == null) {
+                safelyAdd(lore, this.lore = new ArrayList<String>(lore.size()), Integer.MAX_VALUE);
+            } else {
+                this.lore.clear();
+                safelyAdd(lore, this.lore, Integer.MAX_VALUE);
+            }
+        }
+    }
+
+    public int getRepairCost() {
+        return repairCost;
+    }
+
+    public void setRepairCost(int cost) { // TODO: Does this have limits?
+        repairCost = cost;
+    }
+
+    @Override
+    public final boolean equals(Object object) {
+        if (object == null) {
+            return false;
+        }
+        if (object == this) {
+            return true;
+        }
+        if (!(object instanceof CraftMetaItem)) {
+            return false;
+        }
+        return CraftItemFactory.instance().equals(this, (ItemMeta) object);
+    }
+
+    /**
+     * This method is almost as weird as notUncommon.
+     * Only return false if your common internals are unequal.
+     * Checking your own internals is redundant if you are not common, as notUncommon is meant for checking those 'not common' variables.
+     */
+    @Overridden
+    boolean equalsCommon(CraftMetaItem that) {
+        return ((this.hasDisplayName() ? that.hasDisplayName() && this.displayName.equals(that.displayName) : !that.hasDisplayName()))
+                && (this.hasEnchants() ? that.hasEnchants() && this.enchantments.equals(that.enchantments) : !that.hasEnchants())
+                && (this.hasLore() ? that.hasLore() && this.lore.equals(that.lore) : !that.hasLore())
+                && (this.hasRepairCost() ? that.hasRepairCost() && this.repairCost == that.repairCost : !that.hasRepairCost());
+    }
+
+    /**
+     * This method is a bit weird...
+     * Return true if you are a common class OR your uncommon parts are empty.
+     * Empty uncommon parts implies the NBT data would be equivalent if both were applied to an item
+     */
+    @Overridden
+    boolean notUncommon(CraftMetaItem meta) {
+        return true;
+    }
+
+    @Override
+    public final int hashCode() {
+        return applyHash();
+    }
+
+    @Overridden
+    int applyHash() {
+        int hash = 3;
+        hash = 61 * hash + (hasDisplayName() ? this.displayName.hashCode() : 0);
+        hash = 61 * hash + (hasLore() ? this.lore.hashCode() : 0);
+        hash = 61 * hash + (hasEnchants() ? this.enchantments.hashCode() : 0);
+        hash = 61 * hash + (hasRepairCost() ? this.repairCost : 0);
+        return hash;
+    }
+
+    @Overridden
+    @Override
+    public CraftMetaItem clone() {
+        try {
+            return (CraftMetaItem) super.clone();
+        } catch (CloneNotSupportedException e) {
+            throw new Error(e);
+        }
+    }
+
+    public final Map<String, Object> serialize() {
+        ImmutableMap.Builder<String, Object> map = ImmutableMap.builder();
+        map.put(SerializableMeta.TYPE_FIELD, deserializer().name());
+        serialize(map);
+        return map.build();
+    }
+
+    @Overridden
+    ImmutableMap.Builder<String, Object> serialize(ImmutableMap.Builder<String, Object> builder) {
+        if (hasDisplayName()) {
+            builder.put(NAME.BUKKIT, displayName);
+        }
+
+        if (hasLore()) {
+            builder.put(LORE.BUKKIT, ImmutableList.copyOf(lore));
+        }
+
+        if (hasEnchants()) {
+            ImmutableMap.Builder<String, Integer> enchantments = ImmutableMap.builder();
+            for (Map.Entry<Enchantment, Integer> enchant : this.enchantments.entrySet()) {
+                enchantments.put(enchant.getKey().getName(), enchant.getValue());
+            }
+            builder.put(ENCHANTMENTS.BUKKIT, enchantments.build());
+        }
+
+        if (hasRepairCost()) {
+            builder.put(REPAIR.BUKKIT, repairCost);
+        }
+
+        return builder;
+    }
+
+    @Overridden
+    SerializableMeta.Deserializers deserializer() {
+        return SerializableMeta.Deserializers.UNSPECIFIC;
+    }
+
+    static void safelyAdd(Collection<?> addFrom, Collection<String> addTo, int maxItemLength) {
+        if (addFrom == null) {
+            return;
+        }
+
+        for (Object object : addFrom) {
+            if (!(object instanceof String)) {
+                if (object != null) {
+                    throw new IllegalArgumentException(addFrom + " cannot contain non-string " + object.getClass().getName());
+                }
+
+                addTo.add("");
+            } else {
+                String page = object.toString();
+
+                if (page.length() > maxItemLength) {
+                    page = page.substring(0, maxItemLength);
+                }
+
+                addTo.add(page);
+            }
+        }
+    }
+
+    @Override
+    public final String toString() {
+        return serialize().toString(); // TODO: cry
+    }
+}

src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaLeatherArmor.java

@@ -0,0 +1,137 @@
+package org.bukkit.craftbukkit.inventory;
+
+import static org.bukkit.craftbukkit.inventory.CraftItemFactory.DEFAULT_LEATHER_COLOR;
+
+import java.util.Map;
+
+import net.minecraft.server.NBTTagCompound;
+import net.minecraft.server.NBTTagInt;
+
+import org.bukkit.Color;
+import org.bukkit.Material;
+import org.bukkit.configuration.serialization.DelegateDeserialization;
+import org.bukkit.craftbukkit.inventory.CraftMetaItem.SerializableMeta;
+import org.bukkit.inventory.meta.LeatherArmorMeta;
+
+import com.google.common.collect.ImmutableMap.Builder;
+
+@DelegateDeserialization(SerializableMeta.class)
+class CraftMetaLeatherArmor extends CraftMetaItem implements LeatherArmorMeta {
+    static final ItemMetaKey COLOR = new ItemMetaKey("color");
+
+    private Color color = DEFAULT_LEATHER_COLOR;
+
+    CraftMetaLeatherArmor(CraftMetaItem meta) {
+        super(meta);
+        if (!(meta instanceof CraftMetaLeatherArmor)) {
+            return;
+        }
+
+        CraftMetaLeatherArmor armorMeta = (CraftMetaLeatherArmor) meta;
+        this.color = armorMeta.color;
+    }
+
+    CraftMetaLeatherArmor(NBTTagCompound tag) {
+        super(tag);
+        if (tag.hasKey(DISPLAY.NBT)) {
+            NBTTagCompound display = tag.getCompound(DISPLAY.NBT);
+            if (display.hasKey(COLOR.NBT)) {
+                color = Color.fromRGB(display.getInt(COLOR.NBT));
+            }
+        }
+    }
+
+    CraftMetaLeatherArmor(Map<String, Object> map) {
+        super(map);
+        setColor(SerializableMeta.getObject(Color.class, map, COLOR.BUKKIT, true));
+    }
+
+    void applyToItem(NBTTagCompound itemTag) {
+        super.applyToItem(itemTag);
+
+        if (hasColor()) {
+            setDisplayTag(itemTag, COLOR.NBT, new NBTTagInt(COLOR.NBT, color.asRGB()));
+        }
+    }
+
+    @Override
+    boolean isEmpty() {
+        return super.isEmpty() && isLeatherArmorEmpty();
+    }
+
+    boolean isLeatherArmorEmpty() {
+        return !(hasColor());
+    }
+
+    boolean applicableTo(Material type) {
+        switch(type) {
+            case LEATHER_HELMET:
+            case LEATHER_CHESTPLATE:
+            case LEATHER_LEGGINGS:
+            case LEATHER_BOOTS:
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    @Override
+    public CraftMetaLeatherArmor clone() {
+        return (CraftMetaLeatherArmor) super.clone();
+    }
+
+    public Color getColor() {
+        return color;
+    }
+
+    public void setColor(Color color) {
+        this.color = color == null ? DEFAULT_LEATHER_COLOR : color;
+    }
+
+    boolean hasColor() {
+        return !DEFAULT_LEATHER_COLOR.equals(color);
+    }
+
+    @Override
+    Builder<String, Object> serialize(Builder<String, Object> builder) {
+        super.serialize(builder);
+
+        if (hasColor()) {
+            builder.put(COLOR.BUKKIT, color);
+        }
+
+        return builder;
+    }
+
+    @Override
+    SerializableMeta.Deserializers deserializer() {
+        return SerializableMeta.Deserializers.LEATHER_ARMOR;
+    }
+
+    @Override
+    boolean equalsCommon(CraftMetaItem meta) {
+        if (!super.equalsCommon(meta)) {
+            return false;
+        }
+        if (meta instanceof CraftMetaLeatherArmor) {
+            CraftMetaLeatherArmor that = (CraftMetaLeatherArmor) meta;
+
+            return color.equals(that.color);
+        }
+        return true;
+    }
+
+    @Override
+    boolean notUncommon(CraftMetaItem meta) {
+        return super.notUncommon(meta) && (meta instanceof CraftMetaLeatherArmor || isLeatherArmorEmpty());
+    }
+
+    int applyHash() {
+        final int original;
+        int hash = original = super.applyHash();
+        if (hasColor()) {
+            hash ^= color.hashCode();
+        }
+        return original != hash ? CraftMetaSkull.class.hashCode() ^ hash : hash;
+    }
+}

src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaMap.java

@@ -0,0 +1,139 @@
+package org.bukkit.craftbukkit.inventory;
+
+import java.util.Map;
+
+import net.minecraft.server.NBTTagCompound;
+
+import org.bukkit.Material;
+import org.bukkit.configuration.serialization.DelegateDeserialization;
+import org.bukkit.craftbukkit.inventory.CraftMetaItem.SerializableMeta;
+import org.bukkit.inventory.meta.MapMeta;
+
+import com.google.common.collect.ImmutableMap;
+
+@DelegateDeserialization(SerializableMeta.class)
+class CraftMetaMap extends CraftMetaItem implements MapMeta {
+    static final ItemMetaKey MAP_SCALING = new ItemMetaKey("map_is_scaling", "scaling");
+    static final byte SCALING_EMPTY = (byte) 0;
+    static final byte SCALING_TRUE = (byte) 1;
+    static final byte SCALING_FALSE = (byte) 2;
+
+    private byte scaling = SCALING_EMPTY;
+
+    CraftMetaMap(CraftMetaItem meta) {
+        super(meta);
+
+        if (!(meta instanceof CraftMetaMap)) {
+            return;
+        }
+
+        CraftMetaMap map = (CraftMetaMap) meta;
+        this.scaling = map.scaling;
+    }
+
+    CraftMetaMap(NBTTagCompound tag) {
+        super(tag);
+
+        if (tag.hasKey(MAP_SCALING.NBT)) {
+            this.scaling = tag.getBoolean(MAP_SCALING.NBT) ? SCALING_TRUE : SCALING_FALSE;
+        }
+    }
+
+    CraftMetaMap(Map<String, Object> map) {
+        super(map);
+
+        if (map.containsKey(MAP_SCALING.BUKKIT)) {
+            this.scaling = SerializableMeta.getBoolean(map, MAP_SCALING.BUKKIT) ? SCALING_TRUE : SCALING_FALSE;
+        }
+    }
+
+    @Override
+    void applyToItem(NBTTagCompound tag) {
+        super.applyToItem(tag);
+
+        if (hasScaling()) {
+            tag.setBoolean(MAP_SCALING.NBT, isScaling());
+        }
+    }
+
+    @Override
+    boolean applicableTo(Material type) {
+        switch (type) {
+            case MAP:
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    @Override
+    boolean isEmpty() {
+        return super.isEmpty() && isMapEmpty();
+    }
+
+    boolean isMapEmpty() {
+        return !hasScaling();
+    }
+
+    boolean hasScaling() {
+        return scaling != SCALING_EMPTY;
+    }
+
+    public boolean isScaling() {
+        return scaling == SCALING_TRUE;
+    }
+
+    public void setScaling(boolean scaling) {
+        this.scaling = scaling ? SCALING_TRUE : SCALING_FALSE;
+    }
+
+    @Override
+    boolean equalsCommon(CraftMetaItem meta) {
+        if (!super.equalsCommon(meta)) {
+            return false;
+        }
+        if (meta instanceof CraftMetaMap) {
+            CraftMetaMap that = (CraftMetaMap) meta;
+
+            return (this.scaling == that.scaling);
+        }
+        return true;
+    }
+
+    @Override
+    boolean notUncommon(CraftMetaItem meta) {
+        return super.notUncommon(meta) && (meta instanceof CraftMetaMap || isMapEmpty());
+    }
+
+    @Override
+    int applyHash() {
+        final int original;
+        int hash = original = super.applyHash();
+
+        if (hasScaling()) {
+            hash ^= 0x22222222 << (isScaling() ? 1 : -1);
+        }
+
+        return original != hash ? CraftMetaMap.class.hashCode() ^ hash : hash;
+    }
+
+    public CraftMetaMap clone() {
+        return (CraftMetaMap) super.clone();
+    }
+
+    @Override
+    ImmutableMap.Builder<String, Object> serialize(ImmutableMap.Builder<String, Object> builder) {
+        super.serialize(builder);
+
+        if (hasScaling()) {
+            builder.put(MAP_SCALING.BUKKIT, scaling);
+        }
+
+        return builder;
+    }
+
+    @Override
+    SerializableMeta.Deserializers deserializer() {
+        return SerializableMeta.Deserializers.MAP;
+    }
+}

src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaPotion.java

@@ -0,0 +1,260 @@
+package org.bukkit.craftbukkit.inventory;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+import net.minecraft.server.NBTTagCompound;
+import net.minecraft.server.NBTTagList;
+
+import org.apache.commons.lang.Validate;
+import org.bukkit.Material;
+import org.bukkit.configuration.serialization.DelegateDeserialization;
+import org.bukkit.inventory.meta.PotionMeta;
+import org.bukkit.potion.PotionEffect;
+import org.bukkit.potion.PotionEffectType;
+import org.bukkit.craftbukkit.inventory.CraftMetaItem.SerializableMeta;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap.Builder;
+
+@DelegateDeserialization(SerializableMeta.class)
+class CraftMetaPotion extends CraftMetaItem implements PotionMeta {
+    static final ItemMetaKey AMPLIFIER = new ItemMetaKey("Amplifier", "amplifier");
+    static final ItemMetaKey AMBIENT = new ItemMetaKey("Ambient", "ambient");
+    static final ItemMetaKey DURATION = new ItemMetaKey("Duration", "duration");
+    static final ItemMetaKey POTION_EFFECTS = new ItemMetaKey("CustomPotionEffects", "custom-effects");
+    static final ItemMetaKey ID = new ItemMetaKey("ID", "potion-id");
+
+    private List<PotionEffect> customEffects;
+
+    CraftMetaPotion(CraftMetaItem meta) {
+        super(meta);
+        if (!(meta instanceof CraftMetaPotion)) {
+            return;
+        }
+        CraftMetaPotion potionMeta = (CraftMetaPotion) meta;
+        if (potionMeta.hasCustomEffects()) {
+            this.customEffects = new ArrayList<PotionEffect>(potionMeta.customEffects);
+        }
+    }
+
+    CraftMetaPotion(NBTTagCompound tag) {
+        super(tag);
+
+        if (tag.hasKey(POTION_EFFECTS.NBT)) {
+            NBTTagList list = tag.getList(POTION_EFFECTS.NBT);
+            int length = list.size();
+            if (length > 0) {
+                customEffects = new ArrayList<PotionEffect>(length);
+
+                for (int i = 0; i < length; i++) {
+                    NBTTagCompound effect = (NBTTagCompound) list.get(i);
+                    PotionEffectType type = PotionEffectType.getById(effect.getByte(ID.NBT));
+                    int amp = effect.getByte(AMPLIFIER.NBT);
+                    int duration = effect.getInt(DURATION.NBT);
+                    boolean ambient = effect.getBoolean(AMBIENT.NBT);
+                    customEffects.add(new PotionEffect(type, duration, amp, ambient));
+                }
+            }
+        }
+    }
+
+    CraftMetaPotion(Map<String, Object> map) {
+        super(map);
+
+        List<?> rawEffectList = SerializableMeta.getObject(List.class, map, POTION_EFFECTS.BUKKIT, true);
+        if (rawEffectList == null) {
+            return;
+        }
+
+        for (Object obj : rawEffectList) {
+            if (!(obj instanceof PotionEffect)) {
+                throw new IllegalArgumentException("Object in effect list is not valid. " + obj.getClass());
+            }
+            addCustomEffect((PotionEffect) obj, true);
+        }
+    }
+
+    @Override
+    void applyToItem(NBTTagCompound tag) {
+        super.applyToItem(tag);
+        if (hasCustomEffects()) {
+            NBTTagList effectList = new NBTTagList();
+            tag.set(POTION_EFFECTS.NBT, effectList);
+
+            for (PotionEffect effect : customEffects) {
+                NBTTagCompound effectData = new NBTTagCompound();
+                effectData.setByte(ID.NBT, (byte) effect.getType().getId());
+                effectData.setByte(AMPLIFIER.NBT, (byte) effect.getAmplifier());
+                effectData.setInt(DURATION.NBT, effect.getDuration());
+                effectData.setBoolean(AMBIENT.NBT, effect.isAmbient());
+                effectList.add(effectData);
+            }
+        }
+    }
+
+    @Override
+    boolean isEmpty() {
+        return super.isEmpty() && isPotionEmpty();
+    }
+
+    boolean isPotionEmpty() {
+        return !(hasCustomEffects());
+    }
+
+    @Override
+    boolean applicableTo(Material type) {
+        switch(type) {
+            case POTION:
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    @Override
+    public CraftMetaPotion clone() {
+        CraftMetaPotion clone = (CraftMetaPotion) super.clone();
+        if (hasCustomEffects()) {
+            clone.customEffects = new ArrayList<PotionEffect>(customEffects);
+        }
+        return clone;
+    }
+
+    public boolean hasCustomEffects() {
+        return !(customEffects == null || customEffects.isEmpty());
+    }
+
+    public List<PotionEffect> getCustomEffects() {
+        if (hasCustomEffects()) {
+            return ImmutableList.copyOf(customEffects);
+        }
+        return ImmutableList.of();
+    }
+
+    public boolean addCustomEffect(PotionEffect effect, boolean overwrite) {
+        Validate.notNull(effect, "Potion effect must not be null");
+
+        int index = indexOfEffect(effect.getType());
+        if (index != -1) {
+            if (overwrite) {
+                PotionEffect old = customEffects.get(index);
+                if (old.getAmplifier() == effect.getAmplifier() && old.getDuration() == effect.getDuration() && old.isAmbient() == effect.isAmbient()) {
+                    return false;
+                }
+                customEffects.set(index, effect);
+                return true;
+            } else {
+                return false;
+            }
+        } else {
+            if (customEffects == null) {
+                customEffects = new ArrayList<PotionEffect>();
+            }
+            customEffects.add(effect);
+            return true;
+        }
+    }
+
+    public boolean removeCustomEffect(PotionEffectType type) {
+        Validate.notNull(type, "Potion effect type must not be null");
+
+        if (!hasCustomEffects()) {
+            return false;
+        }
+
+        boolean changed = false;
+        Iterator<PotionEffect> iterator = customEffects.iterator();
+        while (iterator.hasNext()) {
+            PotionEffect effect = iterator.next();
+            if (effect.getType() == type) {
+                iterator.remove();
+                changed = true;
+            }
+        }
+        return changed;
+    }
+
+    public boolean hasCustomEffect(PotionEffectType type) {
+        Validate.notNull(type, "Potion effect type must not be null");
+        return indexOfEffect(type) != -1;
+    }
+
+    public boolean setMainEffect(PotionEffectType type) {
+        Validate.notNull(type, "Potion effect type must not be null");
+        int index = indexOfEffect(type);
+        if (index == -1 || index == 0) {
+            return false;
+        }
+
+        PotionEffect old = customEffects.get(0);
+        customEffects.set(0, customEffects.get(index));
+        customEffects.set(index, old);
+        return true;
+    }
+
+    private int indexOfEffect(PotionEffectType type) {
+        if (!hasCustomEffects()) {
+            return -1;
+        }
+
+        for (int i = 0; i < customEffects.size(); i++) {
+            if (customEffects.get(i).getType().equals(type)) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+    public boolean clearCustomEffects() {
+        boolean changed = hasCustomEffects();
+        customEffects = null;
+        return changed;
+    }
+
+    @Override
+    int applyHash() {
+        final int original;
+        int hash = original = super.applyHash();
+        if (hasCustomEffects()) {
+            hash = 73 * hash + customEffects.hashCode();
+        }
+        return original != hash ? CraftMetaPotion.class.hashCode() ^ hash : hash;
+    }
+
+    @Override
+    public boolean equalsCommon(CraftMetaItem meta) {
+        if (!super.equalsCommon(meta)) {
+            return false;
+        }
+        if (meta instanceof CraftMetaPotion) {
+            CraftMetaPotion that = (CraftMetaPotion) meta;
+
+            return (this.hasCustomEffects() ? that.hasCustomEffects() && this.customEffects.equals(that.customEffects) : !that.hasCustomEffects());
+        }
+        return true;
+    }
+
+    @Override
+    boolean notUncommon(CraftMetaItem meta) {
+        return super.notUncommon(meta) && (meta instanceof CraftMetaPotion || isPotionEmpty());
+    }
+
+    @Override
+    Builder<String, Object> serialize(Builder<String, Object> builder) {
+        super.serialize(builder);
+
+        if (hasCustomEffects()) {
+            builder.put(POTION_EFFECTS.BUKKIT, ImmutableList.copyOf(this.customEffects));
+        }
+
+        return builder;
+    }
+
+    @Override
+    SerializableMeta.Deserializers deserializer() {
+        return SerializableMeta.Deserializers.POTION;
+    }
+}

src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaSkull.java

@@ -0,0 +1,134 @@
+package org.bukkit.craftbukkit.inventory;
+
+import java.util.Map;
+
+import net.minecraft.server.NBTTagCompound;
+
+import org.bukkit.Material;
+import org.bukkit.configuration.serialization.DelegateDeserialization;
+import org.bukkit.craftbukkit.inventory.CraftMetaItem.SerializableMeta;
+import org.bukkit.inventory.meta.SkullMeta;
+
+import com.google.common.base.Strings;
+import com.google.common.collect.ImmutableMap.Builder;
+
+@DelegateDeserialization(SerializableMeta.class)
+class CraftMetaSkull extends CraftMetaItem implements SkullMeta {
+    static final ItemMetaKey SKULL_OWNER = new ItemMetaKey("SkullOwner", "skull-owner");
+    static final int MAX_OWNER_LENGTH = 16;
+
+    private String player;
+
+    CraftMetaSkull(CraftMetaItem meta) {
+        super(meta);
+        if (!(meta instanceof CraftMetaSkull)) {
+            return;
+        }
+        CraftMetaSkull skullMeta = (CraftMetaSkull) meta;
+        this.player = skullMeta.player;
+    }
+
+    CraftMetaSkull(NBTTagCompound tag) {
+        super(tag);
+
+        if (tag.hasKey(SKULL_OWNER.NBT)) {
+            player = tag.getString(SKULL_OWNER.NBT);
+        }
+    }
+
+    CraftMetaSkull(Map<String, Object> map) {
+        super(map);
+        setOwner(SerializableMeta.getString(map, SKULL_OWNER.BUKKIT, true));
+    }
+
+    @Override
+    void applyToItem(NBTTagCompound tag) {
+        super.applyToItem(tag);
+
+        if (hasOwner()) {
+            tag.setString(SKULL_OWNER.NBT, player);
+        }
+    }
+
+    @Override
+    boolean isEmpty() {
+        return super.isEmpty() && isSkullEmpty();
+    }
+
+    boolean isSkullEmpty() {
+        return !(hasOwner());
+    }
+
+    @Override
+    boolean applicableTo(Material type) {
+        switch(type) {
+            case SKULL_ITEM:
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    @Override
+    public CraftMetaSkull clone() {
+        return (CraftMetaSkull) super.clone();
+    }
+
+    public boolean hasOwner() {
+        return !Strings.isNullOrEmpty(player);
+    }
+
+    public String getOwner() {
+        return player;
+    }
+
+    public boolean setOwner(String name) {
+        if (name != null && name.length() > MAX_OWNER_LENGTH) {
+            return false;
+        }
+        player = name;
+        return true;
+    }
+
+    @Override
+    int applyHash() {
+        final int original;
+        int hash = original = super.applyHash();
+        if (hasOwner()) {
+            hash = 61 * hash + player.hashCode();
+        }
+        return original != hash ? CraftMetaSkull.class.hashCode() ^ hash : hash;
+    }
+
+    @Override
+    boolean equalsCommon(CraftMetaItem meta) {
+        if (!super.equalsCommon(meta)) {
+            return false;
+        }
+        if (meta instanceof CraftMetaSkull) {
+            CraftMetaSkull that = (CraftMetaSkull) meta;
+
+            return (this.hasOwner() ? that.hasOwner() && this.player.equals(that.player) : !that.hasOwner());
+        }
+        return true;
+    }
+
+    @Override
+    boolean notUncommon(CraftMetaItem meta) {
+        return super.notUncommon(meta) && (meta instanceof CraftMetaSkull || isSkullEmpty());
+    }
+
+    @Override
+    Builder<String, Object> serialize(Builder<String, Object> builder) {
+        super.serialize(builder);
+        if (hasOwner()) {
+            return builder.put(SKULL_OWNER.BUKKIT, this.player);
+        }
+        return builder;
+    }
+
+    @Override
+    SerializableMeta.Deserializers deserializer() {
+        return SerializableMeta.Deserializers.SKULL;
+    }
+}

src/main/java/org/bukkit/craftbukkit/inventory/CraftShapedRecipe.java

@@ -59,6 +59,6 @@ public class CraftShapedRecipe extends ShapedRecipe implements CraftRecipe {
             data[i] = new net.minecraft.server.ItemStack(id, 1, dmg);
             i++;
         }
-        CraftingManager.getInstance().registerShapedRecipe(CraftItemStack.createNMSItemStack(this.getResult()), data);
+        CraftingManager.getInstance().registerShapedRecipe(CraftItemStack.asNMSCopy(this.getResult()), data);
     }
 }

src/main/java/org/bukkit/craftbukkit/inventory/CraftShapelessRecipe.java

@@ -42,6 +42,6 @@ public class CraftShapelessRecipe extends ShapelessRecipe implements CraftRecipe
             data[i] = new net.minecraft.server.ItemStack(id, 1, dmg);
             i++;
         }
-        CraftingManager.getInstance().registerShapelessRecipe(CraftItemStack.createNMSItemStack(this.getResult()), data);
+        CraftingManager.getInstance().registerShapelessRecipe(CraftItemStack.asNMSCopy(this.getResult()), data);
     }
 }

src/main/java/org/bukkit/craftbukkit/inventory/RecipeIterator.java

@@ -34,7 +34,7 @@ public class RecipeIterator implements Iterator<Recipe> {
         } else {
             removeFrom = smelting;
             int id = smelting.next();
-            CraftItemStack stack = new CraftItemStack(RecipesFurnace.getInstance().getResult(id));
+            CraftItemStack stack = CraftItemStack.asCraftMirror(RecipesFurnace.getInstance().getResult(id));
             CraftFurnaceRecipe recipe = new CraftFurnaceRecipe(stack, new ItemStack(id, 1, (short) -1));
             return recipe;
         }

src/test/java/org/bukkit/DyeColorsTest.java

@@ -0,0 +1,39 @@
+package org.bukkit;
+
+import static org.junit.Assert.*;
+import static org.hamcrest.Matchers.*;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import net.minecraft.server.EntitySheep;
+
+import org.bukkit.support.AbstractTestingBase;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameter;
+import org.junit.runners.Parameterized.Parameters;
+
+@RunWith(Parameterized.class)
+public class DyeColorsTest extends AbstractTestingBase {
+
+    @Parameters(name= "{index}: {0}")
+    public static List<Object[]> data() {
+        List<Object[]> list = new ArrayList<Object[]>();
+        for (DyeColor dye : DyeColor.values()) {
+            list.add(new Object[] {dye});
+        }
+        return list;
+    }
+
+    @Parameter public DyeColor dye;
+
+    @Test
+    public void checkColor() {
+        Color color = dye.getColor();
+        float[] nmsColorArray = EntitySheep.d[dye.getData()];
+        Color nmsColor = Color.fromRGB((int) (nmsColorArray[0] * 255), (int) (nmsColorArray[1] * 255), (int) (nmsColorArray[2] * 255));
+        assertThat(color, is(nmsColor));
+    }
+}

src/test/java/org/bukkit/PerMaterialTest.java

@@ -11,6 +11,8 @@ import net.minecraft.server.Item;
 import net.minecraft.server.ItemFood;
 import net.minecraft.server.ItemRecord;
 
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.inventory.ItemStack;
 import org.bukkit.support.AbstractTestingBase;
 import org.bukkit.support.Util;
 import org.junit.BeforeClass;
@@ -74,10 +76,17 @@ public class PerMaterialTest extends AbstractTestingBase {
 
     @Test
     public void maxStackSize() {
+        final ItemStack bukkit = new ItemStack(material);
+        final CraftItemStack craft = CraftItemStack.asCraftCopy(bukkit);
         if (material == Material.AIR) {
-            assertThat(material.getMaxStackSize(), is(64 /* Why can't I hold all of these AIR? */));
+            final int MAX_AIR_STACK = 0 /* Why can't I hold all of these AIR? */;
+            assertThat(material.getMaxStackSize(), is(MAX_AIR_STACK));
+            assertThat(bukkit.getMaxStackSize(), is(MAX_AIR_STACK));
+            assertThat(craft.getMaxStackSize(), is(MAX_AIR_STACK));
         } else {
             assertThat(material.getMaxStackSize(), is(Item.byId[material.getId()].getMaxStackSize()));
+            assertThat(bukkit.getMaxStackSize(), is(material.getMaxStackSize()));
+            assertThat(craft.getMaxStackSize(), is(material.getMaxStackSize()));
         }
     }
 

src/test/java/org/bukkit/craftbukkit/inventory/CompositeSerialization.java

@@ -0,0 +1,61 @@
+package org.bukkit.craftbukkit.inventory;
+
+import static org.junit.Assert.*;
+import static org.hamcrest.Matchers.*;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.bukkit.configuration.InvalidConfigurationException;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.enchantments.Enchantment;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.support.AbstractTestingBase;
+import org.junit.Test;
+
+
+public class CompositeSerialization extends AbstractTestingBase {
+
+    public YamlConfiguration getConfig() {
+        return new YamlConfiguration();
+    }
+
+    @Test
+    public void testSaveRestoreCompositeList() throws InvalidConfigurationException {
+        YamlConfiguration out = getConfig();
+
+        List<ItemStack> stacks = new ArrayList<ItemStack>();
+        stacks.add(new ItemStack(1));
+        stacks.add(new ItemStack(2));
+        stacks.add(new ItemStack(3));
+        stacks.add(new ItemStack(4, 17));
+        stacks.add(new ItemStack(5, 63));
+        stacks.add(new ItemStack(6, 1, (short) 1));
+        stacks.add(new ItemStack(18, 32, (short) 2));
+
+        ItemStack item7 = new ItemStack(256);
+        item7.addUnsafeEnchantment(Enchantment.getById(1), 1);
+        stacks.add(item7);
+
+        ItemStack item8 = new ItemStack(257);
+        item8.addUnsafeEnchantment(Enchantment.getById(2), 2);
+        item8.addUnsafeEnchantment(Enchantment.getById(3), 1);
+        item8.addUnsafeEnchantment(Enchantment.getById(4), 5);
+        item8.addUnsafeEnchantment(Enchantment.getById(5), 4);
+        stacks.add(item8);
+
+        out.set("composite-list.abc.def", stacks);
+        String yaml = out.saveToString();
+
+        YamlConfiguration in = new YamlConfiguration();
+        in.loadFromString(yaml);
+        List<?> raw = in.getList("composite-list.abc.def");
+
+        assertThat(stacks, hasSize(raw.size()));
+
+        for (int i = 0; i < 9; i++) {
+            assertThat(String.valueOf(i), (Object) stacks.get(i), is((Object) raw.get(i)));
+        }
+    }
+}
+

src/test/java/org/bukkit/craftbukkit/inventory/FactoryItemMaterialTest.java

@@ -0,0 +1,142 @@
+package org.bukkit.craftbukkit.inventory;
+
+import static org.junit.Assert.*;
+import static org.hamcrest.Matchers.*;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.bukkit.Material;
+import org.bukkit.inventory.ItemFactory;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
+import org.bukkit.support.AbstractTestingBase;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameter;
+import org.junit.runners.Parameterized.Parameters;
+
+@RunWith(Parameterized.class)
+public class FactoryItemMaterialTest extends AbstractTestingBase {
+    static final ItemFactory factory = CraftItemFactory.instance();
+    static final StringBuilder buffer = new StringBuilder();
+    static final Material[] materials = Material.values();
+
+    static String name(Enum<?> from, Enum<?> to) {
+        if (from.getClass() == to.getClass()) {
+            return buffer.delete(0, Integer.MAX_VALUE).append(from.getClass().getName()).append(' ').append(from.name()).append(" to ").append(to.name()).toString();
+        }
+        return buffer.delete(0, Integer.MAX_VALUE).append(from.getClass().getName()).append('(').append(from.name()).append(") to ").append(to.getClass().getName()).append('(').append(to.name()).append(')').toString();
+    }
+
+    @Parameters(name="Material[{index}]:{0}")
+    public static List<Object[]> data() {
+        List<Object[]> list = new ArrayList<Object[]>();
+        for (Material material : materials) {
+            list.add(new Object[] {material});
+        }
+        return list;
+    }
+
+    @Parameter(0) public Material material;
+
+    @Test
+    public void itemStack() {
+        ItemStack bukkitStack = new ItemStack(material);
+        CraftItemStack craftStack = CraftItemStack.asCraftCopy(bukkitStack);
+        ItemMeta meta = factory.getItemMeta(material);
+        if (meta == null) {
+            assertThat(material, is(Material.AIR));
+        } else {
+            assertTrue(factory.isApplicable(meta, bukkitStack));
+            assertTrue(factory.isApplicable(meta, craftStack));
+        }
+    }
+
+    @Test
+    public void generalCase() {
+        CraftMetaItem meta = (CraftMetaItem) factory.getItemMeta(material);
+        if (meta == null) {
+            assertThat(material, is(Material.AIR));
+        } else {
+            assertTrue(factory.isApplicable(meta, material));
+            assertTrue(meta.applicableTo(material));
+
+            meta = meta.clone();
+            assertTrue(factory.isApplicable(meta, material));
+            assertTrue(meta.applicableTo(material));
+        }
+    }
+
+    @Test
+    public void asMetaFor() {
+        final CraftMetaItem baseMeta = (CraftMetaItem) factory.getItemMeta(material);
+        if (baseMeta == null) {
+            assertThat(material, is(Material.AIR));
+            return;
+        }
+
+        for (Material other : materials) {
+            final ItemStack bukkitStack = new ItemStack(other);
+            final CraftItemStack craftStack = CraftItemStack.asCraftCopy(bukkitStack);
+            final CraftMetaItem otherMeta = (CraftMetaItem) factory.asMetaFor(baseMeta, other);
+
+            final String testName = name(material, other);
+
+            if (otherMeta == null) {
+                assertThat(testName, other, is(Material.AIR));
+                continue;
+            }
+
+            assertTrue(testName, factory.isApplicable(otherMeta, craftStack));
+            assertTrue(testName, factory.isApplicable(otherMeta, bukkitStack));
+            assertTrue(testName, factory.isApplicable(otherMeta, other));
+            assertTrue(testName, otherMeta.applicableTo(other));
+        }
+    }
+
+    @Test
+    public void blankEqualities() {
+        if (material == Material.AIR) {
+            return;
+        }
+        final CraftMetaItem baseMeta = (CraftMetaItem) factory.getItemMeta(material);
+        final CraftMetaItem baseMetaClone = baseMeta.clone();
+
+        final ItemStack baseMetaStack = new ItemStack(material);
+        baseMetaStack.setItemMeta(baseMeta);
+
+        assertThat(baseMeta, is(not(sameInstance(baseMetaStack.getItemMeta()))));
+
+        assertTrue(factory.equals(baseMeta, null));
+        assertTrue(factory.equals(null, baseMeta));
+
+        assertTrue(factory.equals(baseMeta, baseMetaClone));
+        assertTrue(factory.equals(baseMetaClone, baseMeta));
+
+        assertThat(baseMeta, is(not(sameInstance(baseMetaClone))));
+
+        assertThat(baseMeta, is(baseMetaClone));
+        assertThat(baseMetaClone, is(baseMeta));
+
+        for (Material other : materials) {
+            final String testName = name(material, other);
+
+            final CraftMetaItem otherMeta = (CraftMetaItem) factory.asMetaFor(baseMetaClone, other);
+
+            if (otherMeta == null) {
+                assertThat(testName, other, is(Material.AIR));
+                continue;
+            }
+
+            assertTrue(testName, factory.equals(baseMeta, otherMeta));
+            assertTrue(testName, factory.equals(otherMeta, baseMeta));
+
+            assertThat(testName, baseMeta, is(otherMeta));
+            assertThat(testName, otherMeta, is(baseMeta));
+
+            assertThat(testName, baseMeta.hashCode(), is(otherMeta.hashCode()));
+        }
+    }
+}

src/test/java/org/bukkit/craftbukkit/inventory/ItemMetaImplementationOverrideTest.java

@@ -0,0 +1,67 @@
+package org.bukkit.craftbukkit.inventory;
+
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.bukkit.Material;
+import org.bukkit.craftbukkit.Overridden;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameter;
+import org.junit.runners.Parameterized.Parameters;
+
+@RunWith(Parameterized.class)
+public class ItemMetaImplementationOverrideTest {
+    static final Class<CraftMetaItem> parent = CraftMetaItem.class;
+    static final Class<Overridden> annotation = Overridden.class;
+
+    static final List<Object[]> testData = new ArrayList<Object[]>();
+    static final Method[] methods;
+
+    static final Class<? extends CraftMetaItem>[] subclasses;
+
+    static {
+        List<Class<? extends CraftMetaItem>> classes = new ArrayList<Class<? extends CraftMetaItem>>();
+
+        for (Material material : ItemStackTest.COMPOUND_MATERIALS) {
+            Class<? extends CraftMetaItem> clazz = CraftItemFactory.instance().getItemMeta(material).getClass().asSubclass(parent);
+            if (clazz != parent) {
+                classes.add(clazz);
+            }
+        }
+        subclasses = classes.toArray(new Class[0]);
+
+
+        List<Method> list = new ArrayList<Method>();
+
+        for (Method method: parent.getDeclaredMethods()) {
+            if (method.isAnnotationPresent(annotation)) {
+                list.add(method);
+            }
+        }
+
+        for (Class<?> clazz : subclasses) {
+            for (Method method : list) {
+                testData.add(new Object[]{clazz, method, clazz.getSimpleName() + " contains " + method.getName()});
+            }
+        }
+
+        methods = list.toArray(new Method[list.size()]);
+    }
+
+    @Parameters(name="[{index}]:{2}")
+    public static List<Object[]> data() {
+        return testData;
+    }
+
+    @Parameter(0) public Class clazz;
+    @Parameter(1) public Method method;
+    @Parameter(2) public String name;
+
+    @Test
+    public void testClass() throws Throwable {
+        clazz.getDeclaredMethod(method.getName(), method.getParameterTypes());
+    }
+}

src/test/java/org/bukkit/craftbukkit/inventory/ItemMetaTest.java

@@ -0,0 +1,113 @@
+package org.bukkit.craftbukkit.inventory;
+
+import static org.junit.Assert.*;
+import static org.hamcrest.Matchers.*;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.bukkit.Color;
+import org.bukkit.Material;
+import org.bukkit.craftbukkit.inventory.ItemStackTest.StackProvider;
+import org.bukkit.craftbukkit.inventory.ItemStackTest.StackWrapper;
+import org.bukkit.craftbukkit.inventory.ItemStackTest.BukkitWrapper;
+import org.bukkit.craftbukkit.inventory.ItemStackTest.CraftWrapper;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.BookMeta;
+import org.bukkit.inventory.meta.LeatherArmorMeta;
+import org.bukkit.inventory.meta.MapMeta;
+import org.bukkit.inventory.meta.PotionMeta;
+import org.bukkit.inventory.meta.SkullMeta;
+import org.bukkit.potion.PotionEffectType;
+import org.bukkit.support.AbstractTestingBase;
+import org.junit.Test;
+
+public class ItemMetaTest extends AbstractTestingBase {
+
+    @Test
+    public void testCrazyEquality() {
+        CraftItemStack craft = CraftItemStack.asCraftCopy(new ItemStack(1));
+        craft.setItemMeta(craft.getItemMeta());
+        ItemStack bukkit = new ItemStack(craft);
+        assertThat(craft, is(bukkit));
+        assertThat(bukkit, is((ItemStack) craft));
+    }
+
+    @Test
+    public void testEachExtraData() {
+        final List<StackProvider> providers = Arrays.asList(
+            new StackProvider(Material.BOOK_AND_QUILL) {
+                @Override ItemStack operate(final ItemStack cleanStack) {
+                    final BookMeta meta = (BookMeta) cleanStack.getItemMeta();
+                    meta.setAuthor("Some author");
+                    meta.setPages("Page 1", "Page 2");
+                    meta.setTitle("A title");
+                    cleanStack.setItemMeta(meta);
+                    return cleanStack;
+                }
+            },
+            new StackProvider(Material.SKULL_ITEM) {
+                @Override ItemStack operate(final ItemStack cleanStack) {
+                    final SkullMeta meta = (SkullMeta) cleanStack.getItemMeta();
+                    meta.setOwner("Notch");
+                    cleanStack.setItemMeta(meta);
+                    return cleanStack;
+                }
+            },
+            new StackProvider(Material.MAP) {
+                @Override ItemStack operate(final ItemStack cleanStack) {
+                    final MapMeta meta = (MapMeta) cleanStack.getItemMeta();
+                    meta.setScaling(true);
+                    cleanStack.setItemMeta(meta);
+                    return cleanStack;
+                }
+            },
+            new StackProvider(Material.LEATHER_BOOTS) {
+                @Override ItemStack operate(final ItemStack cleanStack) {
+                    final LeatherArmorMeta meta = (LeatherArmorMeta) cleanStack.getItemMeta();
+                    meta.setColor(Color.FUCHSIA);
+                    cleanStack.setItemMeta(meta);
+                    return cleanStack;
+                }
+            },
+            new StackProvider(Material.POTION) {
+                @Override ItemStack operate(final ItemStack cleanStack) {
+                    final PotionMeta meta = (PotionMeta) cleanStack.getItemMeta();
+                    meta.addCustomEffect(PotionEffectType.CONFUSION.createEffect(1, 1), false);
+                    cleanStack.setItemMeta(meta);
+                    return cleanStack;
+                }
+            }
+        );
+
+        assertThat("Forgotten test?", providers, hasSize(ItemStackTest.COMPOUND_MATERIALS.length - 1 /* Normal item meta */));
+
+        for (final StackProvider provider : providers) {
+            downCastTest(new BukkitWrapper(provider));
+            downCastTest(new CraftWrapper(provider));
+        }
+    }
+
+    private void downCastTest(final StackWrapper provider) {
+        final String name = provider.toString();
+        final ItemStack blank = new ItemStack(1);
+        final ItemStack craftBlank = CraftItemStack.asCraftCopy(blank);
+
+        downCastTest(name, provider.stack(), blank);
+        blank.setItemMeta(blank.getItemMeta());
+        downCastTest(name, provider.stack(), blank);
+
+        downCastTest(name, provider.stack(), craftBlank);
+        craftBlank.setItemMeta(craftBlank.getItemMeta());
+        downCastTest(name, provider.stack(), craftBlank);
+    }
+
+    private void downCastTest(final String name, final ItemStack stack, final ItemStack blank) {
+        assertThat(name, stack, is(not(blank)));
+        assertThat(name, stack.getItemMeta(), is(not(blank.getItemMeta())));
+
+        stack.setTypeId(1);
+
+        assertThat(name, stack, is(blank));
+    }
+}

src/test/java/org/bukkit/craftbukkit/inventory/ItemStackBookTest.java

@@ -0,0 +1,212 @@
+package org.bukkit.craftbukkit.inventory;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.bukkit.Material;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.BookMeta;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+import com.google.common.base.Joiner;
+
+@RunWith(Parameterized.class)
+public class ItemStackBookTest extends ItemStackTest {
+
+    @Parameters(name="[{index}]:{" + NAME_PARAMETER + "}")
+    public static List<Object[]> data() {
+        return StackProvider.compound(operators(), "%s %s", NAME_PARAMETER, Material.WRITTEN_BOOK, Material.BOOK_AND_QUILL);
+    }
+
+    static List<Object[]> operators() {
+        return CompoundOperator.compound(
+            Joiner.on('+'),
+            NAME_PARAMETER,
+            Long.parseLong("1110", 2),
+            ItemStackLoreEnchantmentTest.operators(),
+            Arrays.asList(
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            BookMeta meta = (BookMeta) cleanStack.getItemMeta();
+                            meta.addPage("Page 1", "Page 2");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            return cleanStack;
+                        }
+                    },
+                    "Pages vs. Null"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            BookMeta meta = (BookMeta) cleanStack.getItemMeta();
+                            meta.addPage("Page 1", "Page 2");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            cleanStack.setItemMeta(cleanStack.getItemMeta());
+                            return cleanStack;
+                        }
+                    },
+                    "Pages vs. blank"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            BookMeta meta = (BookMeta) cleanStack.getItemMeta();
+                            meta.addPage("Page 1", "Page 2");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            BookMeta meta = (BookMeta) cleanStack.getItemMeta();
+                            meta.addPage("Page 2", "Page 1");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Pages switched"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            BookMeta meta = (BookMeta) cleanStack.getItemMeta();
+                            meta.addPage("Page 1", "Page 2");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            BookMeta meta = (BookMeta) cleanStack.getItemMeta();
+                            meta.addPage("Page 1");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Pages short"
+                }
+            ),
+            Arrays.asList(
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            BookMeta meta = (BookMeta) cleanStack.getItemMeta();
+                            meta.setAuthor("AnAuthor");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            return cleanStack;
+                        }
+                    },
+                    "Author vs. Null"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            BookMeta meta = (BookMeta) cleanStack.getItemMeta();
+                            meta.setAuthor("AnAuthor");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            cleanStack.setItemMeta(cleanStack.getItemMeta());
+                            return cleanStack;
+                        }
+                    },
+                    "Author vs. blank"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            BookMeta meta = (BookMeta) cleanStack.getItemMeta();
+                            meta.setAuthor("AnAuthor");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            BookMeta meta = (BookMeta) cleanStack.getItemMeta();
+                            meta.setAuthor("AnotherAuthor");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Authors"
+                }
+            ),
+            Arrays.asList(
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            BookMeta meta = (BookMeta) cleanStack.getItemMeta();
+                            meta.setTitle("Some title");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            return cleanStack;
+                        }
+                    },
+                    "Title vs. Null"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            BookMeta meta = (BookMeta) cleanStack.getItemMeta();
+                            meta.setTitle("Some title");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            cleanStack.setItemMeta(cleanStack.getItemMeta());
+                            return cleanStack;
+                        }
+                    },
+                    "title vs. blank"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            BookMeta meta = (BookMeta) cleanStack.getItemMeta();
+                            meta.setTitle("Some title");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            BookMeta meta = (BookMeta) cleanStack.getItemMeta();
+                            meta.setTitle("Different title");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Titles"
+                }
+            )
+        );
+    }
+}

src/test/java/org/bukkit/craftbukkit/inventory/ItemStackLeatherTest.java

@@ -0,0 +1,88 @@
+package org.bukkit.craftbukkit.inventory;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.bukkit.Color;
+import org.bukkit.Material;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.LeatherArmorMeta;
+
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+import com.google.common.base.Joiner;
+
+@RunWith(Parameterized.class)
+public class ItemStackLeatherTest extends ItemStackTest {
+
+    @Parameters(name="[{index}]:{" + NAME_PARAMETER + "}")
+    public static List<Object[]> data() {
+        return StackProvider.compound(operators(), "%s %s", NAME_PARAMETER, Material.LEATHER_BOOTS, Material.LEATHER_CHESTPLATE, Material.LEATHER_HELMET, Material.LEATHER_LEGGINGS);
+    }
+
+    static List<Object[]> operators() {
+        return CompoundOperator.compound(
+            Joiner.on('+'),
+            NAME_PARAMETER,
+            Long.parseLong("10", 2),
+            ItemStackLoreEnchantmentTest.operators(),
+            Arrays.asList(
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            LeatherArmorMeta meta = (LeatherArmorMeta) cleanStack.getItemMeta();
+                            meta.setColor(Color.FUCHSIA);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            return cleanStack;
+                        }
+                    },
+                    "Color vs Null"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            LeatherArmorMeta meta = (LeatherArmorMeta) cleanStack.getItemMeta();
+                            meta.setColor(Color.GRAY);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            LeatherArmorMeta meta = (LeatherArmorMeta) cleanStack.getItemMeta();
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Color vs Blank"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            LeatherArmorMeta meta = (LeatherArmorMeta) cleanStack.getItemMeta();
+                            meta.setColor(Color.MAROON);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            LeatherArmorMeta meta = (LeatherArmorMeta) cleanStack.getItemMeta();
+                            meta.setColor(Color.ORANGE);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Color vs Other"
+                }
+            )
+        );
+    }
+}

src/test/java/org/bukkit/craftbukkit/inventory/ItemStackLoreEnchantmentTest.java

@@ -0,0 +1,240 @@
+package org.bukkit.craftbukkit.inventory;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.bukkit.enchantments.Enchantment;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+import com.google.common.base.Joiner;
+
+@RunWith(Parameterized.class)
+public class ItemStackLoreEnchantmentTest extends ItemStackTest {
+
+    @Parameters(name="[{index}]:{" + NAME_PARAMETER + "}")
+    public static List<Object[]> data() {
+        return StackProvider.compound(operators(), "%s %s", NAME_PARAMETER, ItemStackTest.COMPOUND_MATERIALS);
+    }
+
+    static List<Object[]> operators() {
+        return CompoundOperator.compound(
+            Joiner.on('+'),
+            NAME_PARAMETER,
+            ~0l,
+            Arrays.asList(
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            meta.setLore(Arrays.asList("First Lore", "Second Lore"));
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            return cleanStack;
+                        }
+                    },
+                    "Lore vs Null"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            meta.setLore(Arrays.asList("Some lore"));
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Lore vs Blank"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            meta.setLore(Arrays.asList("Some more lore", "Another lore"));
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            meta.setLore(Arrays.asList("Some more lore"));
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Lore vs Other"
+                }
+            ),
+            Arrays.asList(
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            meta.setDisplayName("TestItemName");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            return cleanStack;
+                        }
+                    },
+                    "Name vs Null"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            meta.setDisplayName("AnotherItemName");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Name vs Blank"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            meta.setDisplayName("The original ItemName");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            meta.setDisplayName("The other name");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Name vs Other"
+                }
+            ),
+            Arrays.asList(
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            cleanStack.addUnsafeEnchantment(Enchantment.DIG_SPEED, 2);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            return cleanStack;
+                        }
+                    },
+                    "EnchantStack vs Null"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            cleanStack.addUnsafeEnchantment(Enchantment.OXYGEN, 1);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "EnchantStack vs Blank"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            cleanStack.addUnsafeEnchantment(Enchantment.ARROW_DAMAGE, 1);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            cleanStack.addUnsafeEnchantment(Enchantment.ARROW_FIRE, 1);
+                            return cleanStack;
+                        }
+                    },
+                    "EnchantStack vs OtherEnchantStack"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            meta.addEnchant(Enchantment.DURABILITY, 1, true);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Enchant vs Blank"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            meta.addEnchant(Enchantment.KNOCKBACK, 1, true);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            return cleanStack;
+                        }
+                    },
+                    "Enchant vs Null"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            meta.addEnchant(Enchantment.PROTECTION_FIRE, 1, true);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            ItemMeta meta = cleanStack.getItemMeta();
+                            meta.addEnchant(Enchantment.PROTECTION_FIRE, 2, true);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Enchant vs Other"
+                }
+            )
+        );
+    }
+}

src/test/java/org/bukkit/craftbukkit/inventory/ItemStackPotionsTest.java

@@ -0,0 +1,145 @@
+package org.bukkit.craftbukkit.inventory;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.bukkit.Material;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.PotionMeta;
+import org.bukkit.potion.PotionEffectType;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+import com.google.common.base.Joiner;
+
+@RunWith(Parameterized.class)
+public class ItemStackPotionsTest extends ItemStackTest {
+
+    @Parameters(name="[{index}]:{" + NAME_PARAMETER + "}")
+    public static List<Object[]> data() {
+        return StackProvider.compound(operators(), "%s %s", NAME_PARAMETER, Material.POTION);
+    }
+
+    static List<Object[]> operators() {
+        return CompoundOperator.compound(
+            Joiner.on('+'),
+            NAME_PARAMETER,
+            Long.parseLong("10", 2),
+            ItemStackLoreEnchantmentTest.operators(),
+            Arrays.asList(
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            final PotionMeta meta = (PotionMeta) cleanStack.getItemMeta();
+                            meta.addCustomEffect(PotionEffectType.CONFUSION.createEffect(1, 1), false);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            return cleanStack;
+                        }
+                    },
+                    "Potion vs Null"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            final PotionMeta meta = (PotionMeta) cleanStack.getItemMeta();
+                            meta.addCustomEffect(PotionEffectType.HARM.createEffect(2, 1), false);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            final PotionMeta meta = (PotionMeta) cleanStack.getItemMeta();
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Potion vs Blank"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            final PotionMeta meta = (PotionMeta) cleanStack.getItemMeta();
+                            meta.addCustomEffect(PotionEffectType.SLOW_DIGGING.createEffect(1, 1), false);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            final PotionMeta meta = (PotionMeta) cleanStack.getItemMeta();
+                            meta.addCustomEffect(PotionEffectType.FAST_DIGGING.createEffect(1, 1), false);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Potion vs Harder"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            final PotionMeta meta = (PotionMeta) cleanStack.getItemMeta();
+                            meta.addCustomEffect(PotionEffectType.JUMP.createEffect(1, 1), false);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            final PotionMeta meta = (PotionMeta) cleanStack.getItemMeta();
+                            meta.addCustomEffect(PotionEffectType.JUMP.createEffect(1, 1), false);
+                            meta.addCustomEffect(PotionEffectType.REGENERATION.createEffect(1, 1), false);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Potion vs Better"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            final PotionMeta meta = (PotionMeta) cleanStack.getItemMeta();
+                            meta.addCustomEffect(PotionEffectType.SPEED.createEffect(10, 1), false);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            final PotionMeta meta = (PotionMeta) cleanStack.getItemMeta();
+                            meta.addCustomEffect(PotionEffectType.SPEED.createEffect(5, 1), false);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Potion vs Faster"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            final PotionMeta meta = (PotionMeta) cleanStack.getItemMeta();
+                            meta.addCustomEffect(PotionEffectType.INCREASE_DAMAGE.createEffect(1, 1), false);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            final PotionMeta meta = (PotionMeta) cleanStack.getItemMeta();
+                            meta.addCustomEffect(PotionEffectType.INCREASE_DAMAGE.createEffect(1, 2), false);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Potion vs Stronger"
+                }
+            )
+        );
+    }
+}

src/test/java/org/bukkit/craftbukkit/inventory/ItemStackSkullTest.java

@@ -0,0 +1,87 @@
+package org.bukkit.craftbukkit.inventory;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.bukkit.Material;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.SkullMeta;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+import com.google.common.base.Joiner;
+
+@RunWith(Parameterized.class)
+public class ItemStackSkullTest extends ItemStackTest {
+
+    @Parameters(name="[{index}]:{" + NAME_PARAMETER + "}")
+    public static List<Object[]> data() {
+        return StackProvider.compound(operators(), "%s %s", NAME_PARAMETER, Material.SKULL_ITEM);
+    }
+
+    static List<Object[]> operators() {
+        return CompoundOperator.compound(
+            Joiner.on('+'),
+            NAME_PARAMETER,
+            Long.parseLong("10", 2),
+            ItemStackLoreEnchantmentTest.operators(),
+            Arrays.asList(
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            SkullMeta meta = (SkullMeta) cleanStack.getItemMeta();
+                            meta.setOwner("Notch");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            SkullMeta meta = (SkullMeta) cleanStack.getItemMeta();
+                            meta.setOwner("Dinnerbone");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Name 1 vs. Name 2"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            SkullMeta meta = (SkullMeta) cleanStack.getItemMeta();
+                            meta.setOwner("Notch");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            SkullMeta meta = (SkullMeta) cleanStack.getItemMeta();
+                            meta.setOwner(null);
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    "Name vs. Null"
+                },
+                new Object[] {
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            SkullMeta meta = (SkullMeta) cleanStack.getItemMeta();
+                            meta.setOwner("Notch");
+                            cleanStack.setItemMeta(meta);
+                            return cleanStack;
+                        }
+                    },
+                    new Operator() {
+                        public ItemStack operate(ItemStack cleanStack) {
+                            return cleanStack;
+                        }
+                    },
+                    "Name vs. None"
+                }
+            )
+        );
+    }
+}

src/test/java/org/bukkit/craftbukkit/inventory/ItemStackTest.java

@@ -0,0 +1,428 @@
+package org.bukkit.craftbukkit.inventory;
+
+import static org.bukkit.support.Matchers.sameHash;
+import static org.junit.Assert.*;
+import static org.hamcrest.Matchers.*;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.bukkit.Material;
+import org.bukkit.configuration.InvalidConfigurationException;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.inventory.ItemFactory;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
+import org.bukkit.support.AbstractTestingBase;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameter;
+import org.junit.runners.Parameterized.Parameters;
+
+import com.google.common.base.Joiner;
+import com.google.common.collect.ImmutableList;
+
+@RunWith(Parameterized.class)
+public class ItemStackTest extends AbstractTestingBase {
+    static abstract class StackProvider {
+        final Material material;
+
+        StackProvider(Material material) {
+            this.material = material;
+        }
+
+        ItemStack bukkit() {
+            return operate(cleanStack(material, false));
+        }
+
+        ItemStack craft() {
+            return operate(cleanStack(material, true));
+        }
+
+        abstract ItemStack operate(ItemStack cleanStack);
+
+        static ItemStack cleanStack(Material material, boolean craft) {
+            final ItemStack stack = new ItemStack(material);
+            return craft ? CraftItemStack.asCraftCopy(stack) : stack;
+        }
+
+        @Override
+        public String toString() {
+            return material.toString();
+        }
+
+        /**
+         * For each item in parameterList, it will apply nameFormat at nameIndex.
+         * For each item in parameterList for each item in materials, it will create a stack provider at each array index that contains an Operator.
+         *
+         * @param parameterList
+         * @param nameFormat
+         * @param nameIndex
+         * @param materials
+         * @return
+         */
+        static List<Object[]> compound(final List<Object[]> parameterList, final String nameFormat, final int nameIndex, final Material...materials) {
+            final List<Object[]> out = new ArrayList<Object[]>();
+            for (Object[] params : parameterList) {
+                final int len = params.length;
+                for (final Material material : materials) {
+                    final Object[] paramsOut = params.clone();
+                    for (int i = 0; i < len; i++) {
+                        final Object param = paramsOut[i];
+                        if (param instanceof Operator) {
+                            final Operator operator = (Operator) param;
+                            paramsOut[i] = new StackProvider(material) {
+                                @Override
+                                ItemStack operate(ItemStack cleanStack) {
+                                    return operator.operate(cleanStack);
+                                }
+                            };
+                        }
+                    }
+                    paramsOut[nameIndex] = String.format(nameFormat, paramsOut[nameIndex], material);
+                    out.add(paramsOut);
+                }
+            }
+            return out;
+        }
+    }
+
+    interface Operator {
+        ItemStack operate(ItemStack cleanStack);
+    }
+
+    static class CompoundOperator implements Operator {
+        static class RecursiveContainer {
+            final Joiner joiner;
+            final Object[] strings;
+            final int nameParameter;
+            final List<Object[]> stack;
+            final List<Object[]> out;
+            final List<Object[]>[] lists;
+
+            RecursiveContainer(Joiner joiner, Object[] strings, int nameParameter, List<Object[]> stack, List<Object[]> out, List<Object[]>[] lists) {
+                this.joiner = joiner;
+                this.strings = strings;
+                this.nameParameter = nameParameter;
+                this.stack = stack;
+                this.out = out;
+                this.lists = lists;
+            }
+        }
+        final Operator[] operators;
+
+        CompoundOperator(Operator...operators) {
+            this.operators = operators;
+        }
+
+        public ItemStack operate(ItemStack cleanStack) {
+            for (Operator operator : operators) {
+                operator.operate(cleanStack);
+            }
+            return cleanStack;
+        }
+
+        @Override
+        public String toString() {
+            return Arrays.toString(operators);
+        }
+
+
+        /**
+         * This combines different tests into one large collection, combining no two tests from the same list.
+         * @param joiner used to join names
+         * @param nameParameter index of the name parameter
+         * @param singletonBitmask a list of bits representing the 'singletons' located in your originalLists. Lowest order bits represent the first items in originalLists.
+         *      Singletons are exponentially linked with each other, such that,
+         *      the output will contain every unique subset of only items from the singletons,
+         *      as well as every unique subset that contains at least one item from each non-singleton.
+         * @param originalLists
+         * @return
+         */
+        static List<Object[]> compound(final Joiner joiner, final int nameParameter, final long singletonBitmask, final List<Object[]>...originalLists) {
+
+            final List<Object[]> out = new ArrayList<Object[]>();
+            final List<List<Object[]>> singletons = new ArrayList<List<Object[]>>();
+            final List<List<Object[]>> notSingletons = new ArrayList<List<Object[]>>();
+
+            { // Separate and prime the 'singletons'
+                int i = 0;
+                for (List<Object[]> list : originalLists) {
+                    (((singletonBitmask >>> i++) & 0x1) == 0x1 ? singletons : notSingletons).add(list);
+                }
+            }
+
+            for (final List<Object[]> primarySingleton : singletons) {
+                // Iterate over our singletons, to multiply the 'out' each time
+                for (final Object[] entry : out.toArray(EMPTY_ARRAY)) {
+                    // Iterate over a snapshot of 'out' to prevent CMEs / infinite iteration
+                    final int len = entry.length;
+                    for (final Object[] singleton : primarySingleton) {
+                        // Iterate over each item in our singleton for the current 'out' entry
+                        final Object[] toOut = entry.clone();
+                        for (int i = 0; i < len; i++) {
+                            // Iterate over each parameter
+                            if (i == nameParameter) {
+                                toOut[i] = joiner.join(toOut[i], singleton[i]);
+                            } else if (toOut[i] instanceof Operator) {
+                                final Operator op1 = (Operator) toOut[i];
+                                final Operator op2 = (Operator) singleton[i];
+                                toOut[i] = new Operator() {
+                                    public ItemStack operate(final ItemStack cleanStack) {
+                                        return op2.operate(op1.operate(cleanStack));
+                                    }
+                                };
+                            }
+                        }
+                        out.add(toOut);
+                    }
+                }
+                out.addAll(primarySingleton);
+            }
+
+            final List<Object[]>[] lists = new List[notSingletons.size() + 1];
+            notSingletons.toArray(lists);
+            lists[lists.length - 1] = out;
+
+            final RecursiveContainer methodParams = new RecursiveContainer(joiner, new Object[lists.length], nameParameter, new ArrayList<Object[]>(lists.length), new ArrayList<Object[]>(), lists);
+
+            recursivelyCompound(methodParams, 0);
+            methodParams.out.addAll(out);
+
+            return methodParams.out;
+        }
+
+        private static void recursivelyCompound(final RecursiveContainer methodParams, final int level) {
+            final List<Object[]> stack = methodParams.stack;
+
+            if (level == methodParams.lists.length) {
+                final Object[] firstParams = stack.get(0);
+                final int len = firstParams.length;
+                final int stackSize = stack.size();
+                final Object[] params = new Object[len];
+
+                for (int i = 0; i < len; i++) {
+                    final Object firstParam = firstParams[i];
+
+                    if (firstParam instanceof Operator) {
+                        final Operator[] operators = new Operator[stackSize];
+                        for (int j = 0; j < stackSize; j++) {
+                            operators[j] = (Operator) stack.get(j)[i];
+                        }
+
+                        params[i] = new CompoundOperator(operators);
+                    } else if (i == methodParams.nameParameter) {
+                        final Object[] strings = methodParams.strings;
+                        for (int j = 0; j < stackSize; j++) {
+                            strings[j] = stack.get(j)[i];
+                        }
+
+                        params[i] = methodParams.joiner.join(strings);
+                    } else {
+                        params[i] = firstParam;
+                    }
+                }
+
+                methodParams.out.add(params);
+            } else {
+                final int marker = stack.size();
+
+                for (final Object[] params : methodParams.lists[level]) {
+                    stack.add(params);
+                    recursivelyCompound(methodParams, level + 1);
+                    stack.remove(marker);
+                }
+            }
+        }
+    }
+
+    interface StackWrapper {
+        ItemStack stack();
+    }
+
+    static class CraftWrapper implements StackWrapper {
+        final StackProvider provider;
+
+        CraftWrapper(StackProvider provider) {
+            this.provider = provider;
+        }
+
+        public ItemStack stack() {
+            return provider.craft();
+        }
+
+        @Override
+        public String toString() {
+            return "Craft " + provider;
+        }
+    }
+
+    static class BukkitWrapper implements StackWrapper {
+        final StackProvider provider;
+
+        BukkitWrapper(StackProvider provider) {
+            this.provider = provider;
+        }
+
+        public ItemStack stack() {
+            return provider.bukkit();
+        }
+
+        @Override
+        public String toString() {
+            return "Bukkit " + provider;
+        }
+    }
+
+    static class NoOpProvider extends StackProvider {
+
+        NoOpProvider(Material material) {
+            super(material);
+        }
+
+        @Override
+        ItemStack operate(ItemStack cleanStack) {
+            return cleanStack;
+        }
+
+        @Override
+        public String toString() {
+            return "NoOp " + super.toString();
+        }
+    }
+
+    @Parameters(name="[{index}]:{" + NAME_PARAMETER + "}")
+    public static List<Object[]> data() {
+        return ImmutableList.of(); // TODO, test basic durability issues
+    }
+
+    static final Object[][] EMPTY_ARRAY = new Object[0][];
+    /**
+     * Materials that generate unique item meta types.
+     */
+    static final Material[] COMPOUND_MATERIALS;
+    static final int NAME_PARAMETER = 2;
+    static {
+        COMPOUND_MATERIALS = new Object() { // Workaround for JDK5
+            Material[] value() {
+                final ItemFactory factory = CraftItemFactory.instance();
+                final Map<Class<? extends ItemMeta>, Material> possibleMaterials = new HashMap<Class<? extends ItemMeta>, Material>();
+                for (final Material material : Material.values()) {
+                    final ItemMeta meta = factory.getItemMeta(material);
+                    if (meta == null || possibleMaterials.containsKey(meta.getClass()))
+                        continue;
+                    possibleMaterials.put(meta.getClass(), material);
+
+                }
+                return possibleMaterials.values().toArray(new Material[possibleMaterials.size()]);
+            }
+        }.value();
+    }
+
+    @Parameter(0) public StackProvider provider;
+    @Parameter(1) public StackProvider unequalProvider;
+    @Parameter(NAME_PARAMETER) public String name;
+
+    @Test
+    public void testBukkitInequality() {
+        final StackWrapper bukkitWrapper = new CraftWrapper(provider);
+        testInequality(bukkitWrapper, new BukkitWrapper(unequalProvider));
+        testInequality(bukkitWrapper, new BukkitWrapper(new NoOpProvider(provider.material)));
+    }
+
+    @Test
+    public void testCraftInequality() {
+        final StackWrapper craftWrapper = new CraftWrapper(provider);
+        testInequality(craftWrapper, new CraftWrapper(unequalProvider));
+        testInequality(craftWrapper, new CraftWrapper(new NoOpProvider(provider.material)));
+    }
+
+    @Test
+    public void testMixedInequality() {
+        final StackWrapper craftWrapper = new CraftWrapper(provider);
+        testInequality(craftWrapper, new BukkitWrapper(unequalProvider));
+        testInequality(craftWrapper, new BukkitWrapper(new NoOpProvider(provider.material)));
+
+        final StackWrapper bukkitWrapper = new CraftWrapper(provider);
+        testInequality(bukkitWrapper, new CraftWrapper(unequalProvider));
+        testInequality(bukkitWrapper, new CraftWrapper(new NoOpProvider(provider.material)));
+    }
+
+    static void testInequality(StackWrapper provider, StackWrapper unequalProvider) {
+        final ItemStack stack = provider.stack();
+        final ItemStack stack2 = provider.stack();
+        assertThat(stack, allOf(equalTo(stack), sameHash(stack)));
+        assertThat(stack, is(not(sameInstance(stack2))));
+        assertThat(stack, allOf(equalTo(stack2), sameHash(stack2)));
+
+        final ItemStack unequalStack = unequalProvider.stack();
+        final ItemStack unequalStack2 = unequalProvider.stack();
+        assertThat(unequalStack, allOf(equalTo(unequalStack), sameHash(unequalStack)));
+        assertThat(unequalStack, is(not(sameInstance(unequalStack2))));
+        assertThat(unequalStack, allOf(equalTo(unequalStack2), sameHash(unequalStack2)));
+
+        assertThat(stack, is(not(unequalStack)));
+        assertThat(unequalStack, is(not(stack)));
+
+        final ItemStack newStack = new ItemStack(stack2);
+        assertThat(newStack, allOf(equalTo(stack), sameHash(stack)));
+        assertThat(newStack, is(not(unequalStack)));
+        assertThat(newStack.getItemMeta(), allOf(equalTo(stack.getItemMeta()), sameHash(stack.getItemMeta())));
+        assertThat(newStack.getItemMeta(), is(not(unequalStack.getItemMeta())));
+
+        final ItemStack craftStack = CraftItemStack.asCraftCopy(stack2);
+        assertThat(craftStack, allOf(equalTo(stack), sameHash(stack)));
+        assertThat(craftStack, is(not(unequalStack)));
+        assertThat(craftStack.getItemMeta(), allOf(equalTo(stack.getItemMeta()), sameHash(stack.getItemMeta())));
+        assertThat(craftStack.getItemMeta(), is(not(unequalStack.getItemMeta())));
+
+        final ItemStack newUnequalStack = new ItemStack(unequalStack2);
+        assertThat(newUnequalStack, allOf(equalTo(unequalStack), sameHash(unequalStack)));
+        assertThat(newUnequalStack, is(not(stack)));
+        assertThat(newUnequalStack.getItemMeta(), allOf(equalTo(unequalStack.getItemMeta()), sameHash(unequalStack.getItemMeta())));
+        assertThat(newUnequalStack.getItemMeta(), is(not(stack.getItemMeta())));
+
+        final ItemStack newUnequalCraftStack = CraftItemStack.asCraftCopy(unequalStack2);
+        assertThat(newUnequalCraftStack, allOf(equalTo(unequalStack), sameHash(unequalStack)));
+        assertThat(newUnequalCraftStack, is(not(stack)));
+        assertThat(newUnequalCraftStack.getItemMeta(), allOf(equalTo(unequalStack.getItemMeta()), sameHash(unequalStack.getItemMeta())));
+        assertThat(newUnequalCraftStack.getItemMeta(), is(not(stack.getItemMeta())));
+    }
+
+    @Test
+    public void testBukkitDeserialize() {
+        testDeserialize(new BukkitWrapper(provider), new BukkitWrapper(unequalProvider));
+    }
+
+    @Test
+    public void testCraftDeserialize() {
+        testDeserialize(new CraftWrapper(provider), new CraftWrapper(unequalProvider));
+    }
+
+    static void testDeserialize(StackWrapper provider, StackWrapper unequalProvider) {
+        final ItemStack stack = provider.stack();
+        final ItemStack unequalStack = unequalProvider.stack();
+        final YamlConfiguration configOut = new YamlConfiguration();
+
+        configOut.set("provider", stack);
+        configOut.set("unequal", unequalStack);
+
+        final String out = '\n' + configOut.saveToString();
+        final YamlConfiguration configIn = new YamlConfiguration();
+
+        try {
+            configIn.loadFromString(out);
+        } catch (InvalidConfigurationException ex) {
+            throw new RuntimeException(out, ex);
+        }
+
+        assertThat(out, configIn.getItemStack("provider"), allOf(equalTo(stack), sameHash(stack)));
+        assertThat(out, configIn.getItemStack("unequal"), allOf(equalTo(unequalStack), sameHash(unequalStack)));
+        assertThat(out, configIn.getItemStack("provider"), is(not(unequalStack)));
+        assertThat(out, configIn.getItemStack("provider"), is(not(configIn.getItemStack("unequal"))));
+    }
+}

src/test/java/org/bukkit/craftbukkit/inventory/NMSCraftItemStackTest.java

@@ -9,13 +9,13 @@ import org.bukkit.inventory.ItemStack;
 import org.bukkit.support.AbstractTestingBase;
 import org.junit.Test;
 
-public class CraftItemStackTest extends AbstractTestingBase {
+public class NMSCraftItemStackTest extends AbstractTestingBase {
 
     @Test
     public void testCloneEnchantedItem() throws Exception {
         net.minecraft.server.ItemStack nmsItemStack = new net.minecraft.server.ItemStack(net.minecraft.server.Item.POTION);
         nmsItemStack.addEnchantment(Enchantment.DAMAGE_ALL, 1);
-        ItemStack itemStack = new CraftItemStack(nmsItemStack);
+        ItemStack itemStack = CraftItemStack.asCraftMirror(nmsItemStack);
         ItemStack clone = itemStack.clone();
         assertThat(clone.getType(), is(itemStack.getType()));
         assertThat(clone.getAmount(), is(itemStack.getAmount()));
@@ -29,7 +29,7 @@ public class CraftItemStackTest extends AbstractTestingBase {
     @Test
     public void testCloneNullItem() throws Exception {
         net.minecraft.server.ItemStack nmsItemStack = null;
-        ItemStack itemStack = new CraftItemStack(nmsItemStack);
+        ItemStack itemStack = CraftItemStack.asCraftMirror(nmsItemStack);
         ItemStack clone = itemStack.clone();
         assertThat(clone, is(itemStack));
     }

src/test/java/org/bukkit/craftbukkit/updater/BukkitDLUpdaterServiceTest.java

@@ -1,14 +1,13 @@
 package org.bukkit.craftbukkit.updater;
 
+import static org.junit.Assert.*;
+import static org.hamcrest.Matchers.*;
+
 import java.io.FileNotFoundException;
 import java.io.IOException;
-import java.io.UnsupportedEncodingException;
-import static org.junit.Assert.assertNotNull;
 
-import org.junit.Ignore;
 import org.junit.Test;
 
-@Ignore ("useful tests, but not necessary to run on each compile")
 public class BukkitDLUpdaterServiceTest {
     @Test(expected=IOException.class)
     public void testHostNotFound() throws IOException {
@@ -28,6 +27,6 @@ public class BukkitDLUpdaterServiceTest {
     public void testArtifactExists() throws IOException {
         BukkitDLUpdaterService service = new BukkitDLUpdaterService("dl.bukkit.org");
 
-        assertNotNull(service.fetchArtifact("latest-dev"));
+        assertThat(service.fetchArtifact("latest-dev"), is(not(nullValue())));
     }
 }

src/test/java/org/bukkit/potion/PotionTest.java

@@ -6,21 +6,11 @@ import static org.hamcrest.Matchers.*;
 import java.util.EnumMap;
 import java.util.Map;
 
-import org.bukkit.craftbukkit.potion.CraftPotionBrewer;
+import org.bukkit.support.AbstractTestingBase;
 import org.bukkit.support.Util;
-import org.junit.BeforeClass;
 import org.junit.Test;
 
-import net.minecraft.server.MobEffectList;
-
-public class PotionTest {
-
-    @BeforeClass
-    public static void setUp() {
-        Potion.setPotionBrewer(new CraftPotionBrewer());
-        MobEffectList.BLINDNESS.getClass();
-        PotionEffectType.stopAcceptingRegistrations();
-    }
+public class PotionTest extends AbstractTestingBase {
 
     @Test
     public void getEffects() {
@@ -35,7 +25,7 @@ public class PotionTest {
     }
 
     @Test
-    public void testEffectCompleteness() throws SecurityException, IllegalAccessException, NoSuchFieldException {
+    public void testEffectCompleteness() throws Throwable {
         Map<Integer, ?> effectDurations = Util.getInternalState(net.minecraft.server.PotionBrewer.class, null, "effectDurations");
 
         Map<PotionType, String> effects = new EnumMap(PotionType.class);
@@ -46,7 +36,7 @@ public class PotionTest {
             PotionType enumType = PotionType.getByEffect(type);
             assertNotNull(type.getName(), enumType);
 
-            assertThat(enumType.name(), effects.put(enumType, enumType.name()), is((String)null));
+            assertThat(enumType.name(), effects.put(enumType, enumType.name()), is(nullValue()));
         }
 
         assertThat(effects.entrySet(), hasSize(effectDurations.size()));

src/test/java/org/bukkit/support/AbstractTestingBase.java

@@ -17,5 +17,8 @@ public abstract class AbstractTestingBase {
     @BeforeClass
     public static void setup() {
         StatisticList.a();
+        DummyServer.setup();
+        DummyPotions.setup();
+        DummyEnchantments.setup();
     }
 }

src/test/java/org/bukkit/support/DummyEnchantments.java

@@ -0,0 +1,12 @@
+package org.bukkit.support;
+
+import net.minecraft.server.Enchantment;
+
+public class DummyEnchantments {
+    static {
+        Enchantment.byId.getClass();
+        org.bukkit.enchantments.Enchantment.stopAcceptingRegistrations();
+    }
+
+    public static void setup() {}
+}

src/test/java/org/bukkit/support/DummyPotions.java

@@ -0,0 +1,17 @@
+package org.bukkit.support;
+
+import net.minecraft.server.MobEffectList;
+
+import org.bukkit.craftbukkit.potion.CraftPotionBrewer;
+import org.bukkit.potion.Potion;
+import org.bukkit.potion.PotionEffectType;
+
+public class DummyPotions {
+    static {
+        Potion.setPotionBrewer(new CraftPotionBrewer());
+        MobEffectList.BLINDNESS.getClass();
+        PotionEffectType.stopAcceptingRegistrations();
+    }
+
+    public static void setup() {}
+}

src/test/java/org/bukkit/support/DummyServer.java

@@ -0,0 +1,79 @@
+package org.bukkit.support;
+
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+import java.util.HashMap;
+import java.util.logging.Logger;
+
+import org.bukkit.Bukkit;
+import org.bukkit.Server;
+import org.bukkit.craftbukkit.inventory.CraftItemFactory;
+import org.bukkit.craftbukkit.util.Versioning;
+
+public class DummyServer implements InvocationHandler {
+    private static interface MethodHandler {
+        Object handle(DummyServer server, Object[] args);
+    }
+    private static final HashMap<Method, MethodHandler> methods = new HashMap<Method, MethodHandler>();
+    static {
+        try {
+            methods.put(
+                    Server.class.getMethod("getItemFactory"),
+                    new MethodHandler() {
+                        public Object handle(DummyServer server, Object[] args) {
+                            return CraftItemFactory.instance();
+                        }
+                    }
+                );
+            methods.put(
+                    Server.class.getMethod("getName"),
+                    new MethodHandler() {
+                        public Object handle(DummyServer server, Object[] args) {
+                            return DummyServer.class.getName();
+                        }
+                    }
+                );
+            methods.put(
+                    Server.class.getMethod("getVersion"),
+                    new MethodHandler() {
+                        public Object handle(DummyServer server, Object[] args) {
+                            return DummyServer.class.getPackage().getImplementationVersion();
+                        }
+                    }
+                );
+            methods.put(
+                    Server.class.getMethod("getBukkitVersion"),
+                    new MethodHandler() {
+                        public Object handle(DummyServer server, Object[] args) {
+                            return Versioning.getBukkitVersion();
+                        }
+                    }
+                );
+            methods.put(
+                    Server.class.getMethod("getLogger"),
+                    new MethodHandler() {
+                        final Logger logger = Logger.getLogger(DummyServer.class.getCanonicalName());
+                        public Object handle(DummyServer server, Object[] args) {
+                            return logger;
+                        }
+                    }
+                );
+            Bukkit.setServer(Proxy.getProxyClass(Server.class.getClassLoader(), Server.class).asSubclass(Server.class).getConstructor(InvocationHandler.class).newInstance(new DummyServer()));
+        } catch (Throwable t) {
+            throw new Error(t);
+        }
+    }
+
+    public static void setup() {}
+
+    private DummyServer() {};
+
+    public Object invoke(Object proxy, Method method, Object[] args) {
+        MethodHandler handler = methods.get(method);
+        if (handler != null) {
+            return handler.handle(this, args);
+        }
+        throw new UnsupportedOperationException(String.valueOf(method));
+    }
+}

src/test/java/org/bukkit/support/Matchers.java

@@ -0,0 +1,30 @@
+package org.bukkit.support;
+
+import org.hamcrest.BaseMatcher;
+import org.hamcrest.Description;
+import org.hamcrest.Matcher;
+
+public final class Matchers {
+
+    private Matchers() {}
+
+    public static <T> Matcher<T> sameHash(T value) {
+        return new SameHash<T>(value);
+    }
+
+    static class SameHash<T> extends BaseMatcher<T> {
+        private final int expected;
+
+        SameHash(T object) {
+            expected = object.hashCode();
+        }
+
+        public boolean matches(Object item) {
+            return item.hashCode() == expected;
+        }
+
+        public void describeTo(Description description) {
+            description.appendValue(expected);
+        }
+    }
+}