package myorg.relex.one2one;
   
   import javax.persistence.*;
   
   /**
    * This class demonstrates a one-to-one, uni-directional relationship
    * where the foreign key is used to define the primary key with the
    * use of @MapsId
    */
  @Entity
  @Table(name="RELATIONEX_COACH")
  public class Coach {
  	public enum Type {HEAD, ASSISTANT };
  	@Id //provider sets to FK value with help from @MapsId 
  	private int id;
  
  	@OneToOne(optional=false, fetch=FetchType.EAGER)
  	@MapsId //informs provider the PK is derived from FK
  	private Person person;
  
  	@Enumerated(EnumType.STRING) @Column(length=16)
  	private Type type;
  
  	public Coach() {}	
  	public Coach(Person person) {
  		this.person = person;
  	}
  	
  	public int getId() { return person==null ? 0 : person.getId(); }
  	public Person getPerson() { return person; }
  
  	public Type getType() { return type; }
  	public void setType(Type type) {
  		this.type = type;
  	}
  }