From 6c67c5ba8e8ce89bfdd90a1d6264d14ba6a9037b Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 18 Jan 2018 01:00:27 -0500
Subject: [PATCH] Optimize Hoppers

Adds data about what Item related methods were used in InventoryMoveItem event
so that the server can improve the performance of this event.

diff --git a/src/main/java/org/bukkit/event/inventory/InventoryMoveItemEvent.java b/src/main/java/org/bukkit/event/inventory/InventoryMoveItemEvent.java
index 06ec99ae..b44cc45b 100644
--- a/src/main/java/org/bukkit/event/inventory/InventoryMoveItemEvent.java
+++ b/src/main/java/org/bukkit/event/inventory/InventoryMoveItemEvent.java
@@ -30,6 +30,8 @@ public class InventoryMoveItemEvent extends Event implements Cancellable {
     private final Inventory destinationInventory;
     private ItemStack itemStack;
     private final boolean didSourceInitiate;
+    public boolean calledGetItem; // Paper
+    public boolean calledSetItem; // Paper
 
     public InventoryMoveItemEvent(final Inventory sourceInventory, final ItemStack itemStack, final Inventory destinationInventory, final boolean didSourceInitiate) {
         Validate.notNull(itemStack, "ItemStack cannot be null");
@@ -55,7 +57,8 @@ public class InventoryMoveItemEvent extends Event implements Cancellable {
      * @return ItemStack
      */
     public ItemStack getItem() {
-        return itemStack.clone();
+        calledGetItem = true; // Paper - record this method was used for auto detection of mode
+        return itemStack; // Paper - Removed clone, handled better in Server
     }
 
     /**
@@ -67,6 +70,7 @@ public class InventoryMoveItemEvent extends Event implements Cancellable {
      */
     public void setItem(ItemStack itemStack) {
         Validate.notNull(itemStack, "ItemStack cannot be null.  Cancel the event if you want nothing to be transferred.");
+        calledSetItem = true; // Paper - record this method was used for auto detection of mode
         this.itemStack = itemStack.clone();
     }
 
-- 
2.18.0