From 9a156e6947b5c9c31a983dcee2670e4bc7c3aee3 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 a8c48f5a4..04d4a83bf 100644
--- a/src/main/java/org/bukkit/event/inventory/InventoryMoveItemEvent.java
+++ b/src/main/java/org/bukkit/event/inventory/InventoryMoveItemEvent.java
@@ -31,6 +31,8 @@ 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(@NotNull final Inventory sourceInventory, @NotNull final ItemStack itemStack, @NotNull final Inventory destinationInventory, final boolean didSourceInitiate) {
         Validate.notNull(itemStack, "ItemStack cannot be null");
@@ -58,7 +60,8 @@ public class InventoryMoveItemEvent extends Event implements Cancellable {
      */
     @NotNull
     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
     }
 
     /**
@@ -70,6 +73,7 @@ public class InventoryMoveItemEvent extends Event implements Cancellable {
      */
     public void setItem(@NotNull 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();
     }
 
-- 
2.21.0