SPIGOT-1292: BlockState based FlowerPot API.

src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java

@@ -296,6 +296,8 @@ public class CraftBlock implements Block {
         case WALL_BANNER:
         case STANDING_BANNER:
             return new CraftBanner(this);
+        case FLOWER_POT:
+            return new CraftFlowerPot(this);
         default:
             return new CraftBlockState(this);
         }

src/main/java/org/bukkit/craftbukkit/block/CraftFlowerPot.java

@@ -0,0 +1,40 @@
+package org.bukkit.craftbukkit.block;
+
+import net.minecraft.server.TileEntityFlowerPot;
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.block.FlowerPot;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.util.CraftMagicNumbers;
+import org.bukkit.material.MaterialData;
+
+public class CraftFlowerPot extends CraftBlockState implements FlowerPot {
+
+    private final TileEntityFlowerPot pot;
+
+    public CraftFlowerPot(Block block) {
+        super(block);
+
+        pot = (TileEntityFlowerPot) ((CraftWorld) block.getWorld()).getTileEntityAt(getX(), getY(), getZ());
+    }
+
+    public CraftFlowerPot(Material material, TileEntityFlowerPot pot) {
+        super(material);
+
+        this.pot = pot;
+    }
+
+    @Override
+    public MaterialData getContents() {
+        return (pot.d() == null) ? null : CraftMagicNumbers.getMaterial(pot.d()).getNewData((byte) pot.e()); // PAIL: rename
+    }
+
+    @Override
+    public void setContents(MaterialData item) {
+        if (item == null) {
+            pot.a(null, 0);
+        } else {
+            pot.a(CraftMagicNumbers.getItem(item.getItemType()), item.getData()); // PAIL: rename
+        }
+    }
+}

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

@@ -16,6 +16,7 @@ import net.minecraft.server.TileEntityCommand;
 import net.minecraft.server.TileEntityDispenser;
 import net.minecraft.server.TileEntityDropper;
 import net.minecraft.server.TileEntityEndGateway;
+import net.minecraft.server.TileEntityFlowerPot;
 import net.minecraft.server.TileEntityFurnace;
 import net.minecraft.server.TileEntityHopper;
 import net.minecraft.server.TileEntityMobSpawner;
@@ -36,6 +37,7 @@ import org.bukkit.craftbukkit.block.CraftCreatureSpawner;
 import org.bukkit.craftbukkit.block.CraftDispenser;
 import org.bukkit.craftbukkit.block.CraftDropper;
 import org.bukkit.craftbukkit.block.CraftEndGateway;
+import org.bukkit.craftbukkit.block.CraftFlowerPot;
 import org.bukkit.craftbukkit.block.CraftFurnace;
 import org.bukkit.craftbukkit.block.CraftHopper;
 import org.bukkit.craftbukkit.block.CraftJukebox;
@@ -279,6 +281,11 @@ public class CraftMetaBlockState extends CraftMetaItem implements BlockStateMeta
                 te = new TileEntityBanner();
             }
             return new CraftBanner(material, (TileEntityBanner) te);
+        case FLOWER_POT_ITEM:
+            if (te == null) {
+                te = new TileEntityFlowerPot();
+            }
+            return new CraftFlowerPot(material, (TileEntityFlowerPot) te);
         default:
             throw new IllegalStateException("Missing blockState for " + material);
         }
@@ -346,6 +353,9 @@ public class CraftMetaBlockState extends CraftMetaItem implements BlockStateMeta
         case STANDING_BANNER:
             valid = te instanceof TileEntityBanner;
             break;
+        case FLOWER_POT_ITEM:
+            valid = te instanceof TileEntityFlowerPot;
+            break;
         default:
             valid = false;
             break;