Upstream Paper

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

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+package net.minecraft.server;
+
+// CraftBukkit start
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.event.inventory.InventoryMoveItemEvent;
+// CraftBukkit end
+
+public class BlockDropper extends BlockDispenser {
+
+    private static final IDispenseBehavior c = new DispenseBehaviorItem();
+
+    public BlockDropper(Block.Info block_info) {
+        super(block_info);
+    }
+
+    protected IDispenseBehavior a(ItemStack itemstack) {
+        return BlockDropper.c;
+    }
+
+    public TileEntity a(IBlockAccess iblockaccess) {
+        return new TileEntityDropper();
+    }
+
+    public void dispense(World world, BlockPosition blockposition) {
+        SourceBlock sourceblock = new SourceBlock(world, blockposition);
+        TileEntityDispenser tileentitydispenser = (TileEntityDispenser) sourceblock.getTileEntity();
+        int i = tileentitydispenser.p();
+
+        if (i < 0) {
+            world.triggerEffect(1001, blockposition, 0);
+        } else {
+            ItemStack itemstack = tileentitydispenser.getItem(i);
+
+            if (!itemstack.isEmpty()) {
+                EnumDirection enumdirection = (EnumDirection) world.getType(blockposition).get(BlockDropper.FACING);
+                IInventory iinventory = TileEntityHopper.a(world, blockposition.shift(enumdirection));
+                ItemStack itemstack1;
+
+                if (iinventory == null) {
+                    itemstack1 = BlockDropper.c.dispense(sourceblock, itemstack);
+                } else {
+                    // CraftBukkit start - Fire event when pushing items into other inventories
+                    CraftItemStack oitemstack = CraftItemStack.asCraftMirror(itemstack.cloneItemStack().cloneAndSubtract(1));
+
+                    org.bukkit.inventory.Inventory destinationInventory;
+                    // Have to special case large chests as they work oddly
+                    if (iinventory instanceof InventoryLargeChest) {
+                        destinationInventory = new org.bukkit.craftbukkit.inventory.CraftInventoryDoubleChest((InventoryLargeChest) iinventory);
+                    } else {
+                        destinationInventory = iinventory.getOwner().getInventory();
+                    }
+
+                    InventoryMoveItemEvent event = new InventoryMoveItemEvent(tileentitydispenser.getOwner().getInventory(), oitemstack.clone(), destinationInventory, true);
+                    world.getServer().getPluginManager().callEvent(event);
+                    if (event.isCancelled()) {
+                        return;
+                    }
+                    itemstack1 = TileEntityHopper.addItem(tileentitydispenser, iinventory, CraftItemStack.asNMSCopy(event.getItem()), enumdirection.opposite());
+                    if (event.getItem().equals(oitemstack) && itemstack1.isEmpty()) {
+                        // CraftBukkit end
+                        itemstack1 = itemstack.cloneItemStack();
+                        itemstack1.subtract(1);
+                    } else {
+                        itemstack1 = itemstack.cloneItemStack();
+                    }
+                }
+
+                tileentitydispenser.setItem(i, itemstack1);
+            }
+        }
+    }
+}