Added method for checking to see if a tileset is mapped to an id.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1175 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/media/tile/tools/MapFileTileSetIDBroker.java

@@ -1,5 +1,5 @@
 //
-// $Id: MapFileTileSetIDBroker.java,v 1.2 2002/02/05 20:29:09 mdb Exp $
+// $Id: MapFileTileSetIDBroker.java,v 1.3 2002/04/03 22:03:23 mdb Exp $
 
 package com.threerings.media.tile.tools;
 
@@ -64,6 +64,13 @@ public class MapFileTileSetIDBroker implements TileSetIDBroker
         return tsid.intValue();
     }
 
+    // documentation inherited from interface
+    public boolean tileSetMapped (String tileSetName)
+        throws PersistenceException
+    {
+        return _map.containsKey(tileSetName);
+    }
+
     // documentation inherited
     public void commit ()
         throws PersistenceException