Chunk fetching improvements

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

@@ -0,0 +1,109 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+package net.minecraft.server;
+import java.util.ArrayList;
+import java.util.Arrays;
+
+/**
+ *
+ * @author Nathan
+ */
+public class LongHashset<V> extends LongHash<V> {
+    long values[][][] = new long[256][][];
+    int count = 0;
+    
+    public boolean isEmpty() {
+        return count == 0;
+    }
+
+    public void add(long key, V value) {
+        int idx1 = (int) (key & 255);
+        int idx2 = (int) ((key >> 32) & 255);
+        long obj1[][] = values[idx1], obj2[];
+        if(obj1 == null) values[idx1] = obj1 = new long[256][];
+        obj2 = obj1[idx2];
+        if(obj2 == null) {
+            obj1[idx2] = obj2 = new long[1];
+            obj2[0] = key;
+            count++;
+        }
+        else {
+            int i;
+            for(i = 0; i < obj2.length; i++) {
+                if(obj2[i] == key) {
+                    return;
+                }
+            }
+            obj2 = Arrays.copyOf(obj2, i+1);
+            obj2[i] = key;
+            count++;
+        }
+    }
+    
+    public boolean containsKey(long key) {
+        int idx1 = (int) (key & 255);
+        int idx2 = (int) ((key >> 32) & 255);
+        long obj1[][] = values[idx1], obj2[];
+        if(obj1 == null) return false;
+        obj2 = obj1[idx2];
+        if(obj2 == null) return false;
+        else {
+            for(long entry : obj2) {
+                if(entry == key) return true;
+            }
+            return false;
+        }
+    }
+    
+    public void remove(long key) {
+        int idx1 = (int) (key & 255);
+        int idx2 = (int) ((key >> 32) & 255);
+        long obj1[][] = values[idx1], obj2[];
+        if(obj1 == null) return;
+        obj2 = obj1[idx2];
+        if(obj2 == null) return;
+        else {
+            int max = obj2.length - 1;
+            for(int i = 0; i <= max; i++) {
+                if(obj2[i] == key) {
+                    count--;
+                    if(i != max) {
+                        obj2[i] = obj2[max];
+                    }
+                    obj2 = Arrays.copyOf(obj2, max);
+                }
+            }
+        }        
+    }
+    
+    public long popFirst() {
+        for(long[][] outer : values) {
+            if(outer == null) continue;
+            for(long[] inner : outer) {
+                if(inner == null) continue;
+                long ret = inner[inner.length - 1];
+                inner = Arrays.copyOf(inner, inner.length - 1);
+                return ret;
+            }
+        }
+        return 0;
+    }
+
+    public long[] keys() {
+        int index = 0;
+        long ret[] = new long[count];
+        for(long[][] outer : values) {
+            if(outer == null) continue;
+            for(long[] inner : outer) {
+                if(inner == null) continue;
+                for(long entry : inner) {
+                    ret[index++] = entry;
+                }
+            }
+        }
+        return ret;
+    }
+}