Move ObjectSet to narya from contrib

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5876 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/ObjectSet.as

@@ -0,0 +1,83 @@
+//
+// $Id$
+//
+// Narya library - tools for developing networked games
+// Copyright (C) 2002-2009 Three Rings Design, Inc., All Rights Reserved
+// http://www.threerings.net/code/narya/
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.threerings.util {
+
+import com.threerings.util.ObjectMap;
+import com.threerings.util.Set;
+
+public class ObjectSet
+    implements Set
+{
+    /** @inheritDoc */
+    public function add (o :Object) :Boolean
+    {
+        return (_objectMap.put(o, null) === undefined);
+    }
+
+    /** @inheritDoc */
+    public function remove (o :Object) :Boolean
+    {
+        return (_objectMap.remove(o) !== undefined);
+    }
+
+    /** @inheritDoc */
+    public function clear () :void
+    {
+        _objectMap.clear();
+    }
+
+    /** @inheritDoc */
+    public function contains (o :Object) :Boolean
+    {
+        return _objectMap.containsKey(o);
+    }
+
+    /** @inheritDoc */
+    public function size () :int
+    {
+        return _objectMap.size();
+    }
+
+    /** @inheritDoc */
+    public function isEmpty () :Boolean
+    {
+        return _objectMap.isEmpty();
+    }
+
+    /** @inheritDoc */
+    public function toArray () :Array
+    {
+        return _objectMap.keys();
+    }
+
+    /** @inheritDoc */
+    public function forEach (callback :Function) :void
+    {
+        _objectMap.forEach(function (key :Object, ...ignored) :void {
+            callback(key);
+        });
+    }
+
+    protected var _objectMap :ObjectMap = new ObjectMap();
+}
+
+}