initial commit

java/src/game/init/ObjectIntIdentityMap.java

@@ -0,0 +1,43 @@
+package game.init;
+
+import java.util.IdentityHashMap;
+import java.util.Iterator;
+import java.util.List;
+
+import game.Predicates;
+import game.collect.Iterators;
+import game.collect.Lists;
+
+public class ObjectIntIdentityMap<T> implements IObjectIntIterable<T>
+{
+    private final IdentityHashMap<T, Integer> identityMap = new IdentityHashMap(512);
+    private final List<T> objectList = Lists.<T>newArrayList();
+
+    public void put(T key, int value)
+    {
+        this.identityMap.put(key, value);
+
+        while (this.objectList.size() <= value)
+        {
+            this.objectList.add(null);
+        }
+
+        this.objectList.set(value, key);
+    }
+
+    public int get(T key)
+    {
+        Integer integer = (Integer)this.identityMap.get(key);
+        return integer == null ? -1 : integer.intValue();
+    }
+
+    public final T getByValue(int value)
+    {
+        return (T)(value >= 0 && value < this.objectList.size() ? this.objectList.get(value) : null);
+    }
+
+    public Iterator<T> iterator()
+    {
+        return Iterators.filter(this.objectList.iterator(), Predicates.notNull());
+    }
+}