/*
 * Created on Nov 10, 2003
 *
 * To change the template for this generated file go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
package org.netbeans.modules.javacore.jmiimpl.javamodel;

import javax.jmi.reflect.RefAssociationLink;
import javax.jmi.reflect.RefObject;

import org.netbeans.jmi.javamodel.Element;

/** RefAssociationLink implementation. 
 * 
 * @author Vladimir Hudec
 *
 */
public class AssociationLinkImpl implements RefAssociationLink {
    
    private final Element end1;
    private final Element end2;
    
    AssociationLinkImpl(Element end1, Element end2) {
        if (end1 == null || end2 == null)
            throw new NullPointerException();
        this.end1 = end1;
        this.end2 = end2;
    }
    
    public RefObject refFirstEnd() {
        return end1;
    }
    
    public RefObject refSecondEnd() {
        return end2;
    }
    
    public boolean equals(Object other) {
        if (other instanceof AssociationLinkImpl) {
            return this == other;
        } else {
            return (other instanceof RefAssociationLink) && 
                ((RefAssociationLink) other).refFirstEnd().equals(refFirstEnd()) && 
                ((RefAssociationLink) other).refSecondEnd().equals(refSecondEnd());
        }
    }
    
    public int hashCode() {
        return (refFirstEnd().refMofId() + refSecondEnd().refMofId()).hashCode();
    }
}