Paper/nms-patches/DispenseBehaviorFilledBucket.patch

--- ../work/decompile-8eb82bde//net/minecraft/server/DispenseBehaviorFilledBucket.java	2014-11-28 11:22:55.858823165 +0000
+++ src/main/java/net/minecraft/server/DispenseBehaviorFilledBucket.java	2014-11-28 11:01:54.000000000 +0000
@@ -1,5 +1,10 @@
 package net.minecraft.server;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.event.block.BlockDispenseEvent;
+// CraftBukkit end
+
 final class DispenseBehaviorFilledBucket extends DispenseBehaviorItem {
 
     private final DispenseBehaviorItem b = new DispenseBehaviorItem();
@@ -9,10 +14,49 @@
     public ItemStack b(ISourceBlock isourceblock, ItemStack itemstack) {
         ItemBucket itembucket = (ItemBucket) itemstack.getItem();
         BlockPosition blockposition = isourceblock.getBlockPosition().shift(BlockDispenser.b(isourceblock.f()));
+                
+        // CraftBukkit start
+        World world = isourceblock.i();
+        int x = blockposition.getX();
+        int y = blockposition.getY();
+        int z = blockposition.getZ();
+        if (world.isEmpty(blockposition) || !world.getType(blockposition).getBlock().getMaterial().isBuildable()) {
+            org.bukkit.block.Block block = world.getWorld().getBlockAt(isourceblock.getBlockPosition().getX(), isourceblock.getBlockPosition().getY(), isourceblock.getBlockPosition().getZ());
+            CraftItemStack craftItem = CraftItemStack.asCraftMirror(itemstack);
+
+            BlockDispenseEvent event = new BlockDispenseEvent(block, craftItem.clone(), new org.bukkit.util.Vector(x, y, z));
+            if (!BlockDispenser.eventFired) {
+                world.getServer().getPluginManager().callEvent(event);
+            }
+
+            if (event.isCancelled()) {
+                return itemstack;
+            }
+
+            if (!event.getItem().equals(craftItem)) {
+                // Chain to handler for new item
+                ItemStack eventStack = CraftItemStack.asNMSCopy(event.getItem());
+                IDispenseBehavior idispensebehavior = (IDispenseBehavior) BlockDispenser.M.get(eventStack.getItem());
+                if (idispensebehavior != IDispenseBehavior.a && idispensebehavior != this) {
+                    idispensebehavior.a(isourceblock, eventStack);
+                    return itemstack;
+                }
+            }
+
+            itembucket = (ItemBucket) CraftItemStack.asNMSCopy(event.getItem()).getItem();
+        }
+        // CraftBukkit end
 
         if (itembucket.a(isourceblock.i(), blockposition)) {
-            itemstack.setItem(Items.BUCKET);
-            itemstack.count = 1;
+            // CraftBukkit start - Handle stacked buckets
+            Item item = Items.BUCKET;
+            if (--itemstack.count == 0) {
+                itemstack.setItem(Items.BUCKET);
+                itemstack.count = 1;
+            } else if (((TileEntityDispenser) isourceblock.getTileEntity()).addItem(new ItemStack(item)) < 0) {
+                this.b.a(isourceblock, new ItemStack(item));
+            }
+            // CraftBukkit end
             return itemstack;
         } else {
             return this.b.a(isourceblock, itemstack);