private Track lastPlayed;
private Expression albumFormat;
public PlaybackOrder() {
final Configuration config = Application.getInstance().getConfiguration();
config.addPropertyChangeListener("playbackOrder.albumFormat", true, new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
String format = config.getString(evt.getPropertyName(), "%album%");
albumFormat = Parser.parse(format);
}