From 387fba40bf4ace15665c03556f01272d752d366e Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Fri, 13 Dec 2013 11:45:47 +1100
Subject: [PATCH] Optimize DataWatcher

Use primitive orientated collections, as well as more effective copies across collections.

diff --git a/src/main/java/net/minecraft/server/DataWatcher.java b/src/main/java/net/minecraft/server/DataWatcher.java
index 90a2a80..cca6bd9 100644
--- a/src/main/java/net/minecraft/server/DataWatcher.java
+++ b/src/main/java/net/minecraft/server/DataWatcher.java
@@ -14,8 +14,13 @@ public class DataWatcher {
 
     private final Entity a;
     private boolean b = true;
-    private static final HashMap c = new HashMap();
-    private final Map d = new HashMap();
+    // Spigot Start
+    private static final gnu.trove.map.TObjectIntMap classToId = new gnu.trove.map.hash.TObjectIntHashMap( 10, 0.5f, -1 );
+    private final gnu.trove.map.TIntObjectMap dataValues = new gnu.trove.map.hash.TIntObjectHashMap( 10, 0.5f, -1 );
+    // These exist as an attempt at backwards compatability for (broken) NMS plugins
+    private static final Map c = gnu.trove.TDecorators.wrap( classToId );
+    private final Map d = gnu.trove.TDecorators.wrap( dataValues );
+    // Spigot End
     private boolean e;
     private ReadWriteLock f = new ReentrantReadWriteLock();
 
@@ -24,19 +29,19 @@ public class DataWatcher {
     }
 
     public void a(int i, Object object) {
-        Integer integer = (Integer) c.get(object.getClass());
+        int integer = classToId.get(object.getClass()); // Spigot
 
-        if (integer == null) {
+        if (integer == -1) { // Spigot
             throw new IllegalArgumentException("Unknown data type: " + object.getClass());
         } else if (i > 31) {
             throw new IllegalArgumentException("Data value id is too big with " + i + "! (Max is " + 31 + ")");
-        } else if (this.d.containsKey(Integer.valueOf(i))) {
+        } else if (this.dataValues.containsKey(i)) { // Spigot
             throw new IllegalArgumentException("Duplicate id value for " + i + "!");
         } else {
-            WatchableObject watchableobject = new WatchableObject(integer.intValue(), i, object);
+            WatchableObject watchableobject = new WatchableObject(integer, i, object); // Spigot
 
             this.f.writeLock().lock();
-            this.d.put(Integer.valueOf(i), watchableobject);
+            this.dataValues.put(i, watchableobject); // Spigot
             this.f.writeLock().unlock();
             this.b = false;
         }
@@ -46,7 +51,7 @@ public class DataWatcher {
         WatchableObject watchableobject = new WatchableObject(j, i, null);
 
         this.f.writeLock().lock();
-        this.d.put(Integer.valueOf(i), watchableobject);
+        this.dataValues.put(i, watchableobject); // Spigot
         this.f.writeLock().unlock();
         this.b = false;
     }
@@ -81,7 +86,7 @@ public class DataWatcher {
         WatchableObject watchableobject;
 
         try {
-            watchableobject = (WatchableObject) this.d.get(Integer.valueOf(i));
+            watchableobject = (WatchableObject) this.dataValues.get(i); // Spigot
         } catch (Throwable throwable) {
             CrashReport crashreport = CrashReport.a(throwable, "Getting synched entity data");
             CrashReportSystemDetails crashreportsystemdetails = crashreport.a("Synched entity data");
@@ -133,7 +138,7 @@ public class DataWatcher {
 
         if (this.e) {
             this.f.readLock().lock();
-            Iterator iterator = this.d.values().iterator();
+            Iterator iterator = this.dataValues.valueCollection().iterator(); // Spigot
 
             while (iterator.hasNext()) {
                 WatchableObject watchableobject = (WatchableObject) iterator.next();
@@ -157,7 +162,7 @@ public class DataWatcher {
 
     public void a(PacketDataSerializer packetdataserializer) {
         this.f.readLock().lock();
-        Iterator iterator = this.d.values().iterator();
+        Iterator iterator = this.dataValues.valueCollection().iterator(); // Spigot
 
         while (iterator.hasNext()) {
             WatchableObject watchableobject = (WatchableObject) iterator.next();
@@ -170,18 +175,11 @@ public class DataWatcher {
     }
 
     public List c() {
-        ArrayList arraylist = null;
+        ArrayList arraylist = new ArrayList(); // Spigot
 
         this.f.readLock().lock();
 
-        WatchableObject watchableobject;
-
-        for (Iterator iterator = this.d.values().iterator(); iterator.hasNext(); arraylist.add(watchableobject)) {
-            watchableobject = (WatchableObject) iterator.next();
-            if (arraylist == null) {
-                arraylist = new ArrayList();
-            }
-        }
+        arraylist.addAll(this.dataValues.valueCollection()); // Spigot
 
         this.f.readLock().unlock();
         return arraylist;
@@ -295,12 +293,14 @@ public class DataWatcher {
     }
 
     static {
-        c.put(Byte.class, Integer.valueOf(0));
-        c.put(Short.class, Integer.valueOf(1));
-        c.put(Integer.class, Integer.valueOf(2));
-        c.put(Float.class, Integer.valueOf(3));
-        c.put(String.class, Integer.valueOf(4));
-        c.put(ItemStack.class, Integer.valueOf(5));
-        c.put(ChunkCoordinates.class, Integer.valueOf(6));
+        // Spigot Start - remove valueOf
+        classToId.put(Byte.class, 0);
+        classToId.put(Short.class, 1);
+        classToId.put(Integer.class, 2);
+        classToId.put(Float.class, 3);
+        classToId.put(String.class, 4);
+        classToId.put(ItemStack.class, 5);
+        classToId.put(ChunkCoordinates.class, 6);
+        // Spigot End
     }
 }
-- 
1.8.3.2