package myorg.relex.many2one;
   
   import java.util.Date;
   
   import javax.persistence.*;
   
   /**
    * This class provides an example of a child entity that derives its primary key from 
    * the parent/one side of a many-to-one relation.
   */
  @Entity
  @Table(name="RELATIONEX_ITEM")
  public class Item {
  	@EmbeddedId
  	private ItemPK id;
  	
  	@ManyToOne(optional=false)
  	@MapsId("typeId") //refers to the ItemPK.typeId property
  	@JoinColumn(name="TYPE_ID")
  	private ItemType itemType;
  	
  	@Temporal(TemporalType.TIMESTAMP)
  	private Date created;
  	
  	protected Item() {}
  	public Item(ItemType itemType, int number) {		
  		this.itemType = itemType;
  			//typeId in PK auto-mapped to itemType FK
  		this.id = new ItemPK().setNumber(number);
  	}
  
  	public ItemPK getId() { return id; }
  	public ItemType getItemType() { return itemType; }
  
  	public Date getCreated() { return created; }
  	public void setCreated(Date created) {
  		this.created = created;
  	}
  	
  	@Override
  	public String toString() {
  		return (itemType==null?null:itemType) + "pk=" + id;
  	}
  }