import java.util.*;
import javax.persistence.*;

@Entity
@Table (name="music_genre")
public class MusicGenre {
   
   @Id
   @GeneratedValue (strategy=GenerationType.AUTO, generator="musicgenre_seq_gen")
   @SequenceGenerator(name="musicgenre_seq_gen", sequenceName="MUSICGENRE_SEQ")
   private Long id = new Long(-1);
   
   @OneToOne
   @JoinColumn (name="parent_id")
   private MusicGenre parentMusicGenre = null;
   
   @OneToMany (cascade=CascadeType.ALL)
   @JoinColumn(name="parent_id")
   private List<MusicGenre> childMusicGenres = new ArrayList<MusicGenre>();
   
   private String name = "";
   
   public MusicGenre() {
      
   }
   
   public MusicGenre(String name) {
      this.name = name;
   }

   public Long getId() {
      return id;
   }

   public String getName() {
      return name;
   }

   public MusicGenre getParentMusicGenre() {
      return parentMusicGenre;
   }

   public void setName(String name) {
      this.name = name;
   }

   public void setParentMusicGenre(MusicGenre parentMusicGenre) {
      this.parentMusicGenre = parentMusicGenre;
   }
   
   public void addChildMusicGenre(MusicGenre childMusicGenre) {
      childMusicGenre.setParentMusicGenre(this);
      childMusicGenres.add(childMusicGenre);
   }
   
   public List<MusicGenre> getChildMusicGenres() {
      return Collections.unmodifiableList(childMusicGenres);
   }
   
   public void setChildMusicGenres(List<MusicGenre> childMusicGenres) {
      this.childMusicGenres = childMusicGenres;
   }
}