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/IBlockState.java b/src/main/java/net/minecraft/server/IBlockState.java
index 0ce77d9230f3d1c53df7c5b72a380a2fa0c6d882..00e67b567f00824b25b45e5ff5ecd62c87ea0309 100644
--- a/src/main/java/net/minecraft/server/IBlockState.java
+++ b/src/main/java/net/minecraft/server/IBlockState.java
@@ -28,23 +28,13 @@ 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<?> blockstate = (IBlockState) object;
-
-            return this.a.equals(blockstate.a) && this.b.equals(blockstate.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.c();
-        }
-
-        return this.c;
+        return this.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 d8738447d794f6967307daa1271473903b76a632..7ca302b522df081755120c597a08d589193c57a6 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 1486d460c8ec3d117b4dc3d28b2c3f1b632e187b..7cdadc6b6abd069f9a1bc000a8f116f73b90e029 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 6f35c365f9086a2289e17b4d8e73757ad2c7f87b..0499a71705f3bdac6c94a8dc340cc15e96d9586e 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)) {