package de.fhdw.wtf.persistence.meta;
   
   /**
    * object of a point-to-point association.
    */
   public class UnidirectionalLink extends Link {
   	
   	/**
   	 * The type of this link.
  	 */
  	private final UnidirectionalAssociation instanceOf;
  	
  	@Override
  	public UnidirectionalAssociation getInstanceOf() {
  		return this.instanceOf;
  	}
  	
  	/**
  	 * creates a unidirectional link between two objects.
  	 * 
  	 * @param id
  	 *            the id of the link
  	 * @param owner
  	 *            the owner of the link
  	 * @param target
  	 *            the target of the link
  	 * @param instanceOf
  	 *            the unidirectional association of the link
  	 */
  	public UnidirectionalLink(final long id,
  			final UserObject owner,
  			final Object target,
  			final UnidirectionalAssociation instanceOf) {
  		super(id, owner, target);
  		this.instanceOf = instanceOf;
  	}
  	
  	@Override
  	public boolean equals(final java.lang.Object other) {
  		if (!(other instanceof UnidirectionalLink)) {
  			return false;
  		}
  		
  		final UnidirectionalLink unidirectionalLink = (UnidirectionalLink) other;
  		return super.equals(unidirectionalLink) && this.getInstanceOf().equals(unidirectionalLink.getInstanceOf());
  	}
  	
  	@Override
  	public int hashCode() {
  		return super.hashCode() ^ this.instanceOf.hashCode();
  	}
  }