Implement BlockBreakEvent block experience. Adds BUKKIT-2033

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

@@ -698,5 +698,9 @@ public class Block {
     public static int getDropData(Block block, int data) {
         return block.getDropData(data);
     }
+
+    public int getExpDrop(World world, int data, int enchantmentLevel) {
+        return 0;
+    }
     // CraftBukkit end
 }

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

@@ -22,9 +22,17 @@ public class BlockMobSpawner extends BlockContainer {
 
     public void dropNaturally(World world, int i, int j, int k, int l, float f, int i1) {
         super.dropNaturally(world, i, j, k, l, f, i1);
+        /* CraftBukkit start - delegate to getExpDrop
         int j1 = 15 + world.random.nextInt(15) + world.random.nextInt(15);
 
-        this.g(world, i, j, k, j1);
+        this.g(world, i, j, k, j1); */
+    }
+
+    public int getExpDrop(World world, int data, int enchantmentLevel) {
+        int j1 = 15 + world.random.nextInt(15) + world.random.nextInt(15);
+
+        return j1;
+        // CraftBukkit end
     }
 
     public boolean d() {

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

@@ -33,6 +33,7 @@ public class BlockOre extends Block {
 
     public void dropNaturally(World world, int i, int j, int k, int l, float f, int i1) {
         super.dropNaturally(world, i, j, k, l, f, i1);
+        /* CraftBukkit start - delegated getExpDrop
         if (this.getDropType(l, world.random, i1) != this.id) {
             int j1 = 0;
 
@@ -47,7 +48,28 @@ public class BlockOre extends Block {
             }
 
             this.g(world, i, j, k, j1);
+        } */
+    }
+
+    public int getExpDrop(World world, int l, int i1) {
+        if (this.getDropType(l, world.random, i1) != this.id) {
+            int j1 = 0;
+
+            if (this.id == Block.COAL_ORE.id) {
+                j1 = MathHelper.a(world.random, 0, 2);
+            } else if (this.id == Block.DIAMOND_ORE.id) {
+                j1 = MathHelper.a(world.random, 3, 7);
+            } else if (this.id == Block.EMERALD_ORE.id) {
+                j1 = MathHelper.a(world.random, 3, 7);
+            } else if (this.id == Block.LAPIS_ORE.id) {
+                j1 = MathHelper.a(world.random, 2, 5);
+            }
+
+            return j1;
         }
+
+        return 0;
+        // CraftBukkit end
     }
 
     protected int getDropData(int i) {

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

@@ -77,11 +77,23 @@ public class BlockRedstoneOre extends Block {
 
     public void dropNaturally(World world, int i, int j, int k, int l, float f, int i1) {
         super.dropNaturally(world, i, j, k, l, f, i1);
+        /* CraftBukkit start - delegate to getExpDrop
         if (this.getDropType(l, world.random, i1) != this.id) {
             int j1 = 1 + world.random.nextInt(5);
 
             this.g(world, i, j, k, j1);
+        } */
+    }
+
+    public int getExpDrop(World world, int l, int i1) {
+        if (this.getDropType(l, world.random, i1) != this.id) {
+            int j1 = 1 + world.random.nextInt(5);
+
+            return j1;
         }
+
+        return 0;
+        // CraftBukkit end
     }
 
     private void n(World world, int i, int j, int k) {

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

@@ -243,6 +243,8 @@ public class ItemInWorldManager {
 
     public boolean breakBlock(int i, int j, int k) {
         // CraftBukkit start
+        BlockBreakEvent event = null;
+
         if (this.player instanceof EntityPlayer) {
             org.bukkit.block.Block block = this.world.getWorld().getBlockAt(i, j, k);
 
@@ -255,8 +257,24 @@ public class ItemInWorldManager {
                 ((EntityPlayer) this.player).netServerHandler.sendPacket(packet);
             }
 
-            BlockBreakEvent event = new BlockBreakEvent(block, (org.bukkit.entity.Player) this.player.getBukkitEntity());
-            event.setCancelled(this.gamemode.isAdventure()); // Adventure mode pre-cancel
+            event = new BlockBreakEvent(block, this.player.getBukkitEntity());
+
+            // Adventure mode pre-cancel
+            event.setCancelled(this.gamemode.isAdventure());
+
+            // Calculate default block experience
+            Block nmsBlock = Block.byId[block.getTypeId()];
+
+            if (nmsBlock != null && !event.isCancelled() && !this.isCreative() && this.player.b(nmsBlock)) {
+                // Copied from Block.a(world, entityhuman, int, int, int, int)
+                if (!(nmsBlock.q_() && EnchantmentManager.hasSilkTouchEnchantment(this.player.inventory))) {
+                    int data = block.getData();
+                    int bonusLevel = EnchantmentManager.getBonusBlockLootEnchantmentLevel(this.player.inventory);
+
+                    event.setExpToDrop(nmsBlock.getExpDrop(this.world, data, bonusLevel));
+                }
+            }
+
             this.world.getServer().getPluginManager().callEvent(event);
 
             if (event.isCancelled()) {
@@ -295,6 +313,12 @@ public class ItemInWorldManager {
                 }
             }
 
+            // CraftBukkit start - drop event experience
+            if (flag && event != null) {
+                Block.byId[l].g(this.world, i, j, k, event.getExpToDrop());
+            }
+            // CraftBukkit end
+
             return flag;
         }
     }