// $Id: SuperclassGen.java,v 1.9 2004/08/29 09:29:51 mvw Exp $
// Copyright (c) 1996-2004 The Regents of the University of California. All
// Rights Reserved. Permission to use, copy, modify, and distribute this
// software and its documentation without fee, and without a written
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// and this paragraph appear in all copies.  This software program and
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// uninterrupted or error-free. The end-user understands that the program
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// exclusively on the program for any reason.  IN NO EVENT SHALL THE
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package org.argouml.uml;

import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Vector;
import org.argouml.model.ModelFacade;
import org.tigris.gef.util.ChildGenerator;
/** Utility class to generate the children of a class.  In this case
 *  the "children" of a class are it's base classes. 
 */
public class SuperclassGen implements ChildGenerator {
    
    /**
     * @see org.tigris.gef.util.ChildGenerator#gen(java.lang.Object)
     */
    public Enumeration gen(Object o) {
	Vector res = new Vector();

	Object/*MGeneralizableElement*/ ge = o;
	Collection generalizations = ModelFacade.getGeneralizations(ge);
	if (generalizations == null) return res.elements();
	Iterator gens = generalizations.iterator();
	while (gens.hasNext()) {
	    Object/*MGeneralization*/ g = gens.next();
	    res.add(ModelFacade.getParent(g));
	}
	return res.elements();
    }
} /* end class SuperclassGen  */