Ptidej-v5.2-master/POM Tests/data/ArgoUML_0.28/src/org/argouml/uml/GenAncestorClasses.java
// $Id: GenAncestorClasses.java 13825 2007-11-23 23:48:22Z tfmorris $
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package org.argouml.uml;

import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;

import org.argouml.model.Model;
import org.tigris.gef.util.ChildGenerator;
/** Utility class to generate the base classes of a class. It
 *  recursively moves up the class hierarchy.  But it does that in a
 *  safe way that will not hang in case of cyclic inheritance.
 */
public class GenAncestorClasses implements ChildGenerator {

    /*
     * @see org.tigris.gef.util.ChildGenerator#gen(java.lang.Object)
     */
    public Enumeration gen(Object cls) {
	Set res = new HashSet();
	if (Model.getFacade().isAGeneralizableElement(cls)) {
	    accumulateAncestors(cls, res);
        }
	return Collections.enumeration(res);
    }

    /**
     * @param cls the class (in fact any GeneralizableElement will do)
     * @param accum the accumulated list of generalizations
     */
    public void accumulateAncestors(Object cls, Collection accum) {
	Collection gens = Model.getFacade().getGeneralizations(cls);
	if (gens == null) {
	    return;
	}
	for (Object g : gens) {
	    Object ge = Model.getFacade().getGeneral(g);
	    if (!accum.contains(ge)) {
		accum.add(ge);
		accumulateAncestors(cls, accum);
	    }
	}
    }
}
