Album

Album.java

@Document
@Getter
@Setter
public class Album extends ValueObjectBase {

    @Id
    private ObjectId id;
    private String title;
    private String artist;
    private List<Track> tracks = new ArrayList<Track>();

    public Album(String title, String artist) {
        Guard.shouldNotBeEmpty(title, "title");
        Guard.shouldNotBeEmpty(artist, "artist");
        this.title = title;
        this.artist = artist;
    }

    public void add(Track tract) {
        this.tracks.add(tract);
    }

    @Override
    public int hashCode() {
        return HashTool.compute(id);
    }

    @Override
    public Objects.ToStringHelper buildStringHelper() {
        return super.buildStringHelper()
                .add("id", id)
                .add("title", title)
                .add("artist", artist);
    }

    private static final long serialVersionUID = 958798390838794475L;
}