From fe052c9e1f83309184a62b1e0e6da5f9798c1b06 Mon Sep 17 00:00:00 2001
From: Colin McDonald <macguy8.main@gmail.com>
Date: Sat, 4 Jul 2015 01:21:06 -0400
Subject: [PATCH] Add fastMatches ItemStack comparison


diff --git a/src/main/java/net/minecraft/server/Container.java b/src/main/java/net/minecraft/server/Container.java
index a10108b9f..5cc23bab0 100644
--- a/src/main/java/net/minecraft/server/Container.java
+++ b/src/main/java/net/minecraft/server/Container.java
@@ -27,6 +27,7 @@ public abstract class Container {
     private final Set h = new HashSet();
     protected List listeners = new ArrayList();
     private Set i = new HashSet();
+    private int tickCount; // Spigot
 
     // CraftBukkit start
     public boolean checkReachable = true;
@@ -74,7 +75,7 @@ public abstract class Container {
             ItemStack itemstack = ((Slot) this.c.get(i)).getItem();
             ItemStack itemstack1 = (ItemStack) this.b.get(i);
 
-            if (!ItemStack.matches(itemstack1, itemstack)) {
+            if (!ItemStack.fastMatches(itemstack1, itemstack) || (tickCount % 5 == 0 && !ItemStack.matches(itemstack1, itemstack))) { // Spigot
                 itemstack1 = itemstack == null ? null : itemstack.cloneItemStack();
                 this.b.set(i, itemstack1);
 
@@ -83,6 +84,8 @@ public abstract class Container {
                 }
             }
         }
+
+        tickCount++; // Spigot
     }
 
     public boolean a(EntityHuman entityhuman, int i) {
diff --git a/src/main/java/net/minecraft/server/ItemStack.java b/src/main/java/net/minecraft/server/ItemStack.java
index ee82aba5a..6d84291e2 100644
--- a/src/main/java/net/minecraft/server/ItemStack.java
+++ b/src/main/java/net/minecraft/server/ItemStack.java
@@ -442,6 +442,20 @@ public final class ItemStack {
         return itemstack;
     }
 
+    // Spigot start
+    public static boolean fastMatches(ItemStack itemstack, ItemStack itemstack1) {
+        if (itemstack == null && itemstack1 == null) {
+            return true;
+        }
+
+        if (itemstack != null && itemstack1 != null) {
+            return itemstack.item == itemstack1.item && itemstack.count == itemstack1.count && itemstack.damage == itemstack1.damage;
+        }
+
+        return false;
+    }
+    // Spigot End
+
     public static boolean equals(ItemStack itemstack, ItemStack itemstack1) {
         return itemstack == null && itemstack1 == null ? true : (itemstack != null && itemstack1 != null ? (itemstack.tag == null && itemstack1.tag != null ? false : itemstack.tag == null || itemstack.tag.equals(itemstack1.tag)) : false);
     }
-- 
2.13.3