public List<Track> getPlayedSongs(int from, int num, int locationId) {
int to = from + Math.abs(num);
return data.getPlayedTracks(locationId, from, to);
}
public List<Track> getSongs(int from, int num, String orderBy, long notPlayedIn, int locationId) {
int to = from + Math.abs(num);
Timestamp notPlayedSince = new Timestamp(System.currentTimeMillis() - notPlayedIn);
return data.getSongs(locationId, from, to, orderBy, notPlayedSince);
}