package myorg.relex.one2manybi;
   
   import java.io.Serializable;
   
   /**
    * This class provides an example of an IdClass used by a child entity in a 
    * many-to-one, bi-directional relationship where half of its primary key is
    * derived form the parentId;
    */
  public class TirePK implements Serializable {
  	private static final long serialVersionUID = -6028270454708159105L;
  	private int car;   //shared primary key value from parent and child, name matches child rel
  	private TirePosition position; //child primary key value unique within parent
  	
  	public TirePK() {}
  	public TirePK(int carId, TirePosition position) {
  		this.car=carId;
  		this.position=position;
  	}
  	
  	public int getAutoId() { return car; }
  	public TirePosition getPosition() { return position; }
  	
  	@Override
  	public int hashCode() {
  		return car + (position==null?0:position.hashCode());
  	}
  	
  	@Override
  	public boolean equals(Object obj) {
  		try {
  			if (this==obj) { return true; }
  			TirePK rhs = (TirePK)obj;
  			return car==rhs.car && position==rhs.position;
  		} catch (Exception ex) { return false; }
  	}	
  }