Paper/CraftBukkit-Patches/0040-Make-AnvilInventory.getItem-use-both-containers.-Fix.patch

From e77a472314397933ec067e409257e386c26be32c Mon Sep 17 00:00:00 2001
From: Andre LeBlanc <andre@norcode.com>
Date: Sat, 6 Apr 2013 12:00:31 -0400
Subject: [PATCH] Make AnvilInventory.getItem() use both containers. Fixes
 BUKKIT-2788

The AnvilInventory reports its size as the sum of the ingredient and
result inventories, but when trying to access the slots, only the ingredient
inventory is used, leading to an ArrayIndexOutOfBounds exception.

This change overrides getItem(I) and setItem(I) to use both inventories,
with the slot number adjusted based on their size.

diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryAnvil.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryAnvil.java
index a91d81a..46a1d38 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryAnvil.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryAnvil.java
@@ -1,7 +1,9 @@
 package org.bukkit.craftbukkit.inventory;
 
 import net.minecraft.server.IInventory;
+
 import org.bukkit.inventory.AnvilInventory;
+import org.bukkit.inventory.ItemStack;
 
 public class CraftInventoryAnvil extends CraftInventory implements AnvilInventory {
     private final IInventory resultInventory;
@@ -20,6 +22,26 @@ public class CraftInventoryAnvil extends CraftInventory implements AnvilInventor
     }
 
     @Override
+    public ItemStack getItem(int slot) {
+        if (slot < getIngredientsInventory().getSize()) {
+            net.minecraft.server.ItemStack item = getIngredientsInventory().getItem(slot);
+            return item == null ? null : CraftItemStack.asCraftMirror(item);
+        } else {
+            net.minecraft.server.ItemStack item = getResultInventory().getItem(slot - getIngredientsInventory().getSize());
+            return item == null ? null : CraftItemStack.asCraftMirror(item);
+        }
+    }
+
+    @Override
+    public void setItem(int index, ItemStack item) {
+        if (index < getIngredientsInventory().getSize()) {
+            getIngredientsInventory().setItem(index, (item == null ? null : CraftItemStack.asNMSCopy(item)));
+        } else {
+            getResultInventory().setItem((index - getIngredientsInventory().getSize()), (item == null ? null : CraftItemStack.asNMSCopy(item)));
+        }
+    }
+
+    @Override
     public int getSize() {
         return getResultInventory().getSize() + getIngredientsInventory().getSize();
     }
-- 
1.8.3.2