class AlbumAssembler Альбом public AlbumDTO writeDTO Album subject Alb

class AlbumAssembler {

   // Альбом
   public AlbumDTO writeDTO(Album subject) {
      AlbumDTO result = new AlbumDTO();
      result.setTitle(subject.getTitle());
      result.setArtist(subject.getArtist().getName());
      writeTracks(result, subject);
      return result;
   }

   // Треки
   private void writeTracks(AlbumDTO result, Album subject) {
      List newTracks = new ArrayList();
      Iterator it = subject.getTracks().iterator();
      while (it.hasNext()) {
         TrackDTO newDTO = new TrackDTO();
         Track thisTrack = (Track) it.next();
         newDTO.setTitle(thisTrack.getTitle());
         writePerformers(newDTO, thisTrack);
         newTracks.add(newDTO);
      }
      result.setTracks((TrackDTO[]) newTracks.toArray(new TrackDTO[0]));
   }

   // Исполнители
   private void writePerformers(TrackDTO dto, Track subject) {
      List result = new ArrayList();
      Iterator it = subject.getPerformers().iterator();
      while (it.hasNext()) {
         Artist each = (Artist) it.next();
         result.add(each.getName());
      }
      dto.setPerformers((String[]) result.toArray(new String[0]));
   }