package ejava.examples.orm.rel.annotated;
   
   import javax.persistence.*;
   
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   import ejava.examples.orm.rel.MediaCopyPK2;
   
  /**
   * This version of MediaCopy uses the @MapsId annotation to link the 
   * relationship and primary key properties together. This technique 
   * was added in JPA 2.0 and is stated to be preferred over the JPA 1.0
   * indirect technique.
   */
  
  @Entity @Table(name="ORMREL_MEDIACOPY2")
  @IdClass(MediaCopyPK2.class)
  @AttributeOverrides({
  	@AttributeOverride(name="copyNo", column=@Column(name="COPY_NO"))
  })
  public class MediaCopy2 {
      private static final Logger log = LoggerFactory.getLogger(MediaCopy2.class);
      @Id //mapped to COPY_NO by attribute override
      private int copyNo;    
      @Id 
      @ManyToOne 
      @JoinColumn(name="MEDIACOPY_MID")
      private Media media;
      
      protected MediaCopy2() { log.debug(super.toString() + ": ctor()"); }
      public MediaCopy2(Media media, int copyNo) {
          log.debug(super.toString() + ": ctor() mediaId="
                  + media.getId() + ", copyNo=" + copyNo);
          setMedia(media);
          setCopyNo(copyNo);
      }    
  
      public int getCopyNo()                { return copyNo; }    
      private void setCopyNo(int copyNo)    { this.copyNo = copyNo; }
      
      public long getMediaId()              { return media.getId();} //mediaId; }
      
      public Media getMedia()               { return media; }    
      private void setMedia(Media media)    { this.media = media; }
  
      private String myInstance() {
          String s=super.toString();
          s = s.substring(s.lastIndexOf('.')+1);
          return s;
      }
  
      public String toString() {
          return myInstance() +
              ", mediaId=" + getMediaId() +
              ", copyNo=" + getCopyNo() +
              ", media=" + getMedia();
      }
  }