code: protected UniformTileSet loadCachedTileSet (String bundle, String imgPath, int width,
          int height)
      {
          String key = bundle + "::" + imgPath;
          SoftReference<UniformTileSet> ref = _handcache.get(key);
          UniformTileSet uts = (ref == null) ? null : ref.get();
          if (uts == null) {
              uts = new UniformTileSet();
              uts.setImageProvider(_defaultProvider);
              uts.setImagePath(imgPath);
              uts.setWidth(width);
              uts.setHeight(height);
              _handcache.put(key, new SoftReference<UniformTileSet>(uts));
          }
          return uts;
      }
docs: Used to load and cache tilesets loaded via {@link #loadTileSet}.