PaperMC/Spigot-Server-Patches/0108-Optimise-BlockState-s-hashCode-equals.patch

From 0000000000000000000000000000000000000000 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/BlockStateBoolean.java b/src/main/java/net/minecraft/server/BlockStateBoolean.java
index 8df150f4cabb3dd98cb66c9d1af7fae035a6a6fe..4ca8db630434915de4eaeac6c4ecd60714d7f5d9 100644
--- a/src/main/java/net/minecraft/server/BlockStateBoolean.java
+++ b/src/main/java/net/minecraft/server/BlockStateBoolean.java
@@ -30,8 +30,7 @@ public class BlockStateBoolean extends IBlockState<Boolean> {
         return obool.toString();
     }
 
-    @Override
-    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 8162c11d14b8e88c2b572f9ddf6b7a15977047f8..8dc620b22bb904aa6a82e2127aa9da861986525c 100644
--- a/src/main/java/net/minecraft/server/BlockStateEnum.java
+++ b/src/main/java/net/minecraft/server/BlockStateEnum.java
@@ -49,8 +49,7 @@ public class BlockStateEnum<T extends Enum<T> & INamable> extends IBlockState<T>
         return ((INamable) t0).getName();
     }
 
-    @Override
-    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 5bd7a236b948666ca31e53cb3a8aa0dc147e274b..36b84446e96faefad3b783f73df74e0f3bce8255 100644
--- a/src/main/java/net/minecraft/server/BlockStateInteger.java
+++ b/src/main/java/net/minecraft/server/BlockStateInteger.java
@@ -38,8 +38,7 @@ public class BlockStateInteger extends IBlockState<Integer> {
         return this.a;
     }
 
-    @Override
-    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)) {
diff --git a/src/main/java/net/minecraft/server/IBlockState.java b/src/main/java/net/minecraft/server/IBlockState.java
index d63a4e4916ed5f5d901be0f4dd2c13cf66239055..6550b55067db31dbbc903fe17a13849383651c5a 100644
--- a/src/main/java/net/minecraft/server/IBlockState.java
+++ b/src/main/java/net/minecraft/server/IBlockState.java
@@ -59,23 +59,17 @@ public abstract class IBlockState<T extends Comparable<T>> {
     }
 
     public boolean equals(Object object) {
-        if (this == object) {
-            return true;
-        } else if (!(object instanceof IBlockState)) {
-            return false;
-        } else {
-            IBlockState<?> iblockstate = (IBlockState) object;
-
-            return this.a.equals(iblockstate.a) && this.b.equals(iblockstate.b);
-        }
+        return this == object; // Paper - only one instance per configuration
     }
 
+    private static final 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.b();
         }
 
-        return this.c;
+        return this.hashCode; // Paper - only one instance per configuration
     }
 
     public int b() {