PaperMC/Spigot-Server-Patches/0130-Optimise-BlockState-s-hashCode-equals.patch

From 63f4233aa49d41ab53a84ebd6a20d8d10449855f Mon Sep 17 00:00:00 2001
From: Alfie Cleveland <alfeh@me.com>
Date: Fri, 19 Aug 2016 01:52:56 +0100
Subject: [PATCH] Optimise BlockState's hashCode/equals

These are singleton "single instance" objects. We can rely on
object identity checks safely.

Use a simpler optimized hashcode

diff --git a/src/main/java/net/minecraft/server/BlockState.java b/src/main/java/net/minecraft/server/BlockState.java
index d95c0955a9..ea0e0ff4fe 100644
--- a/src/main/java/net/minecraft/server/BlockState.java
+++ b/src/main/java/net/minecraft/server/BlockState.java
@@ -26,23 +26,13 @@ public abstract class BlockState<T extends Comparable<T>> implements IBlockState
     }
 
     public boolean equals(Object object) {
-        if (this == object) {
-            return true;
-        } else if (!(object instanceof BlockState)) {
-            return false;
-        } else {
-            BlockState<?> blockstate = (BlockState) object;
-
-            return this.a.equals(blockstate.a) && this.b.equals(blockstate.b);
-        }
+        return this == object; // Paper - only one instance per configuration
     }
 
+    private static java.util.concurrent.atomic.AtomicInteger hashId = new java.util.concurrent.atomic.AtomicInteger(1);// Paper - only one instance per configuration
+    private final int hashCode = 92821 * hashId.getAndIncrement(); // Paper - only one instance per configuration
     public final int hashCode() {
-        if (this.c == null) {
-            this.c = this.c();
-        }
-
-        return this.c;
+        return hashCode; // Paper - only one instance per configuration
     }
 
     public int c() {
diff --git a/src/main/java/net/minecraft/server/BlockStateBoolean.java b/src/main/java/net/minecraft/server/BlockStateBoolean.java
index 4c1d39d67c..71d2ad9703 100644
--- a/src/main/java/net/minecraft/server/BlockStateBoolean.java
+++ b/src/main/java/net/minecraft/server/BlockStateBoolean.java
@@ -28,7 +28,7 @@ public class BlockStateBoolean extends BlockState<Boolean> {
         return obool.toString();
     }
 
-    public boolean equals(Object object) {
+    public boolean equals_unused(Object object) { // Paper
         if (this == object) {
             return true;
         } else if (object instanceof BlockStateBoolean && super.equals(object)) {
diff --git a/src/main/java/net/minecraft/server/BlockStateEnum.java b/src/main/java/net/minecraft/server/BlockStateEnum.java
index 986b9ccea8..facbf30b4e 100644
--- a/src/main/java/net/minecraft/server/BlockStateEnum.java
+++ b/src/main/java/net/minecraft/server/BlockStateEnum.java
@@ -47,7 +47,7 @@ public class BlockStateEnum<T extends Enum<T> & INamable> extends BlockState<T>
         return ((INamable) t0).getName();
     }
 
-    public boolean equals(Object object) {
+    public boolean equals_unused(Object object) { // Paper
         if (this == object) {
             return true;
         } else if (object instanceof BlockStateEnum && super.equals(object)) {
diff --git a/src/main/java/net/minecraft/server/BlockStateInteger.java b/src/main/java/net/minecraft/server/BlockStateInteger.java
index 2f12e15e07..613cd0bce2 100644
--- a/src/main/java/net/minecraft/server/BlockStateInteger.java
+++ b/src/main/java/net/minecraft/server/BlockStateInteger.java
@@ -37,7 +37,7 @@ public class BlockStateInteger extends BlockState<Integer> {
         return this.a;
     }
 
-    public boolean equals(Object object) {
+    public boolean equals_unused(Object object) { // Paper
         if (this == object) {
             return true;
         } else if (object instanceof BlockStateInteger && super.equals(object)) {
-- 
2.20.1