Changed the tileset cache to use soft references. We want the cache

because we'd like to use the same TileSet over again when possible, but
we don't want to forevermore hold onto a TileSet if it could be gc'd.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3392 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/media/tile/TileManager.java

@@ -1,5 +1,5 @@
 //
-// $Id: TileManager.java,v 1.37 2004/10/28 17:49:02 mdb Exp $
+// $Id$
 //
 // Narya library - tools for developing networked games
 // Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
@@ -21,6 +21,8 @@
 
 package com.threerings.media.tile;
 
+import java.lang.ref.SoftReference;
+
 import java.util.HashMap;
 
 import com.samskivert.io.PersistenceException;
@@ -107,14 +109,16 @@ public class TileManager
         String bundle, String imgPath, int width, int height)
     {
         String key = bundle + "::" + imgPath;
-        UniformTileSet uts = (UniformTileSet)_handcache.get(key);
+        SoftReference ref = (SoftReference) _handcache.get(key);
+        UniformTileSet uts = (ref == null) ? null
+                                           : (UniformTileSet) ref.get();
         if (uts == null) {
             uts = new UniformTileSet();
             uts.setImageProvider(_defaultProvider);
             uts.setImagePath(imgPath);
             uts.setWidth(width);
             uts.setHeight(height);
-            _handcache.put(key, uts);
+            _handcache.put(key, new SoftReference(uts));
         }
         return uts;
     }