LeavesMC/patches/server/0037-Remove-iterators-from-inventory-contains.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: violetc <58360096+s-yh-china@users.noreply.github.com>
Date: Wed, 17 Aug 2022 11:04:12 +0800
Subject: [PATCH] Remove iterators from inventory contains

This patch is Powered by Pufferfish(https://github.com/pufferfish-gg/Pufferfish)

diff --git a/src/main/java/net/minecraft/world/entity/player/Inventory.java b/src/main/java/net/minecraft/world/entity/player/Inventory.java
index 5bc033bf59d49eda1f8f2574165bbcbeab7faa0f..cf89cbffabf8b88265b5ffbc42b55fe617a32c82 100644
--- a/src/main/java/net/minecraft/world/entity/player/Inventory.java
+++ b/src/main/java/net/minecraft/world/entity/player/Inventory.java
@@ -681,21 +681,35 @@ public class Inventory implements Container, Nameable {
     }
 
     public boolean contains(ItemStack stack) {
-        Iterator iterator = this.compartments.iterator();
+        // Leaves start - don't allocate iterators
+        if (top.leavesmc.leaves.LeavesConfig.removeInventoryContainsIterators) {
+            for (int i = 0; i < this.compartments.size(); i++) {
+                List<ItemStack> list = this.compartments.get(i);
+                for (int j = 0; j < list.size(); j++) {
+                    ItemStack itemstack1 = list.get(j);
+
+                    if (!itemstack1.isEmpty() && itemstack1.sameItem(stack)) {
+                        return true;
+                    }
+                }
+            }
+        } else {
+            Iterator iterator = this.compartments.iterator();
 
-        while (iterator.hasNext()) {
-            List<ItemStack> list = (List) iterator.next();
-            Iterator iterator1 = list.iterator();
+            while (iterator.hasNext()) {
+                List<ItemStack> list = (List) iterator.next();
+                Iterator iterator1 = list.iterator();
 
-            while (iterator1.hasNext()) {
-                ItemStack itemstack1 = (ItemStack) iterator1.next();
+                while (iterator1.hasNext()) {
+                    ItemStack itemstack1 = (ItemStack) iterator1.next();
 
-                if (!itemstack1.isEmpty() && ItemStack.isSameItemSameTags(itemstack1, stack)) {
-                    return true;
+                    if (!itemstack1.isEmpty() && ItemStack.isSameItemSameTags(itemstack1, stack)) {
+                        return true;
+                    }
                 }
             }
         }
-
+        // Leaves end - don't allocate iterators
         return false;
     }
 
diff --git a/src/main/java/top/leavesmc/leaves/LeavesConfig.java b/src/main/java/top/leavesmc/leaves/LeavesConfig.java
index 92fae1f8b08038d4451643aaedaa63a000a32034..914744995ff7637f063afe1a45d577f41d2c30d9 100644
--- a/src/main/java/top/leavesmc/leaves/LeavesConfig.java
+++ b/src/main/java/top/leavesmc/leaves/LeavesConfig.java
@@ -325,6 +325,11 @@ public final class LeavesConfig {
         removeTickGuardLambda = getBoolean("settings.performance.remove.tick-guard-lambda", removeTickGuardLambda);
     }
 
+    public static boolean removeInventoryContainsIterators = true;
+    private static void removeInventoryContainsIterators() {
+        removeInventoryContainsIterators = getBoolean("settings.performance.remove.inventory-contains-iterators", removeInventoryContainsIterators);
+    }
+
     public static final class WorldConfig {
 
         public final String worldName;