CatServer/patches/net/minecraft/block/BlockCauldron.java.patch

--- ../src-base/minecraft/net/minecraft/block/BlockCauldron.java
+++ ../src-work/minecraft/net/minecraft/block/BlockCauldron.java
@@ -3,6 +3,9 @@
 import java.util.List;
 import java.util.Random;
 import javax.annotation.Nullable;
+
+import org.bukkit.event.block.CauldronLevelChangeEvent;
+
 import net.minecraft.block.material.MapColor;
 import net.minecraft.block.material.Material;
 import net.minecraft.block.properties.IProperty;
@@ -75,8 +78,13 @@
 
         if (!worldIn.isRemote && entityIn.isBurning() && i > 0 && entityIn.getEntityBoundingBox().minY <= (double)f)
         {
+            // CraftBukkit start
+            if (!this.changeLevel(worldIn, pos, state, i - 1, entityIn, CauldronLevelChangeEvent.ChangeReason.EXTINGUISH)) {
+                return;
+            }
             entityIn.extinguish();
-            this.setWaterLevel(worldIn, pos, state, i - 1);
+            //this.setWaterLevel(worldIn, pos, state, i - 1);
+            // CraftBukkit end
         }
     }
 
@@ -95,13 +103,18 @@
             {
                 if (i < 3 && !worldIn.isRemote)
                 {
+                    // CraftBukkit start
+                    if (!this.changeLevel(worldIn, pos, state, 3, playerIn, CauldronLevelChangeEvent.ChangeReason.BUCKET_EMPTY)) {
+                        return true;
+                    }
                     if (!playerIn.capabilities.isCreativeMode)
                     {
                         playerIn.setHeldItem(hand, new ItemStack(Items.BUCKET));
                     }
 
                     playerIn.addStat(StatList.CAULDRON_FILLED);
-                    this.setWaterLevel(worldIn, pos, state, 3);
+                    //this.setWaterLevel(worldIn, pos, state, 3);
+                    // CraftBukkit end
                 }
 
                 return true;
@@ -110,6 +123,10 @@
             {
                 if (i == 3 && !worldIn.isRemote)
                 {
+                    // CraftBukkit start
+                    if (!this.changeLevel(worldIn, pos, state, 0, playerIn, CauldronLevelChangeEvent.ChangeReason.BUCKET_FILL)) {
+                        return true;
+                    }
                     if (!playerIn.capabilities.isCreativeMode)
                     {
                         --heldItem.stackSize;
@@ -125,7 +142,8 @@
                     }
 
                     playerIn.addStat(StatList.CAULDRON_USED);
-                    this.setWaterLevel(worldIn, pos, state, 0);
+                    //this.setWaterLevel(worldIn, pos, state, 0);
+                    // CraftBukkit end
                 }
 
                 return true;
@@ -134,6 +152,10 @@
             {
                 if (i > 0 && !worldIn.isRemote)
                 {
+                    // CraftBukkit start
+                    if (!this.changeLevel(worldIn, pos, state, i - 1, playerIn, CauldronLevelChangeEvent.ChangeReason.BOTTLE_FILL)) {
+                        return true;
+                    }
                     if (!playerIn.capabilities.isCreativeMode)
                     {
                         ItemStack itemstack1 = PotionUtils.addPotionToItemStack(new ItemStack(Items.POTIONITEM), PotionTypes.WATER);
@@ -153,7 +175,8 @@
                         }
                     }
 
-                    this.setWaterLevel(worldIn, pos, state, i - 1);
+                    //this.setWaterLevel(worldIn, pos, state, i - 1);
+                    // CraftBukkit end
                 }
 
                 return true;
@@ -166,8 +189,13 @@
 
                     if (itemarmor.getArmorMaterial() == ItemArmor.ArmorMaterial.LEATHER && itemarmor.hasColor(heldItem) && !worldIn.isRemote)
                     {
+                        // CraftBukkit start
+                        if (!this.changeLevel(worldIn, pos, state, i - 1, playerIn, CauldronLevelChangeEvent.ChangeReason.ARMOR_WASH)) {
+                            return true;
+                        }
                         itemarmor.removeColor(heldItem);
-                        this.setWaterLevel(worldIn, pos, state, i - 1);
+                        //this.setWaterLevel(worldIn, pos, state, i - 1);
+                        // CraftBukkit end
                         playerIn.addStat(StatList.ARMOR_CLEANED);
                         return true;
                     }
@@ -202,7 +230,8 @@
 
                         if (!playerIn.capabilities.isCreativeMode)
                         {
-                            this.setWaterLevel(worldIn, pos, state, i - 1);
+                            this.changeLevel(worldIn, pos, state, i - 1, playerIn, CauldronLevelChangeEvent.ChangeReason.BANNER_WASH); // CraftBukkit
+                            //this.setWaterLevel(worldIn, pos, state, i - 1);
                         }
                     }
 
@@ -216,12 +245,28 @@
         }
     }
 
+    // CraftBukkit start
     public void setWaterLevel(World worldIn, BlockPos pos, IBlockState state, int level)
     {
-        worldIn.setBlockState(pos, state.withProperty(LEVEL, Integer.valueOf(MathHelper.clamp_int(level, 0, 3))), 2);
-        worldIn.updateComparatorOutputLevel(pos, this);
+        this.changeLevel(worldIn, pos, state, level, null, CauldronLevelChangeEvent.ChangeReason.UNKNOWN);
     }
 
+    private boolean changeLevel(World world, BlockPos blockposition, IBlockState iblockdata, int i, Entity entity, CauldronLevelChangeEvent.ChangeReason reason) {
+        int newLevel = Integer.valueOf(MathHelper.clamp_int(i, 0, 3));
+        CauldronLevelChangeEvent event = new CauldronLevelChangeEvent(
+                world.getWorld().getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ()),
+                (entity == null) ? null : entity.getBukkitEntity(), reason, iblockdata.getValue(BlockCauldron.LEVEL), newLevel
+        );
+        world.getServer().getPluginManager().callEvent(event);
+        if (event.isCancelled()) {
+            return false;
+        }
+        world.setBlockState(blockposition, iblockdata.withProperty(BlockCauldron.LEVEL, event.getNewLevel()), 2);
+        world.updateComparatorOutputLevel(blockposition, this);
+        return true;
+    }
+    // CraftBukkit end
+
     public void fillWithRain(World worldIn, BlockPos pos)
     {
         if (worldIn.rand.nextInt(20) == 1)
@@ -234,7 +279,7 @@
 
                 if (((Integer)iblockstate.getValue(LEVEL)).intValue() < 3)
                 {
-                    worldIn.setBlockState(pos, iblockstate.cycleProperty(LEVEL), 2);
+                    setWaterLevel(worldIn, pos, iblockstate.cycleProperty(LEVEL), 2); // CraftBukkit
                 }
             }
         }