Chunk fetching improvements

src/main/java/net/minecraft/server/LongHash.java

@@ -0,0 +1,36 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+package net.minecraft.server;
+
+/**
+ *
+ * @author Nathan
+ */
+public abstract class LongHash<V> {
+    static long toLong(int msw, int lsw) {
+        return ((long)msw << 32) + lsw - Integer.MIN_VALUE;
+    }
+    
+    static int msw(long l) {
+        return (int) (l >> 32);
+    }
+    
+    static int lsw(long l) {
+        return (int) (l & 0xFFFFFFFF) + Integer.MIN_VALUE;
+    }
+
+    public boolean containsKey(int msw, int lsw) {
+        return containsKey(toLong(msw, lsw));
+    }
+
+    public void remove(int msw, int lsw) {
+        remove(toLong(msw, lsw));
+    }
+    
+    public abstract boolean containsKey(long key);
+    
+    public abstract void remove(long key);
+}