+ public static final Function<Sone, List<Album>> toAllAlbums = new Function<Sone, List<Album>>() {
+ @Override
+ public List<Album> apply(@Nullable Sone sone) {
+ return (sone == null) ? Collections.<Album>emptyList() : FLATTENER.apply(
+ sone.getRootAlbum());
+ }
+ };
+