Ptidej-v5.2-master/POM Tests/data/ArgoUML_0.28/src/org/argouml/core/propertypanels/ui/UMLLinkAssociationComboBoxModel.java
// $Id: UMLLinkAssociationComboBoxModel.java 15841 2008-10-01 01:32:13Z penyaskito $
// Copyright (c) 2008 The Regents of the University of California. All
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// software and its documentation without fee, and without a written
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// does not warrant that the operation of the program will be
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package org.argouml.core.propertypanels.ui;

import java.beans.PropertyChangeEvent;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;

import org.argouml.model.Model;
import org.argouml.model.UmlChangeEvent;
import org.argouml.uml.ui.UMLComboBoxModel2;

/**
 * The model for the combobox to show the Association of the Link.
 *
 * @author Michiel
 */
class UMLLinkAssociationComboBoxModel extends UMLComboBoxModel2 {

    /**
     * Constructor for UMLModelElementNamespaceComboBoxModel.
     */
    public UMLLinkAssociationComboBoxModel() {
        super("assocation", true);
    }

    /*
     * @see org.argouml.uml.ui.UMLComboBoxModel2#isValidElement(Object)
     */
    protected boolean isValidElement(Object o) {
        return Model.getFacade().isAAssociation(o);
    }

    /**
     * To simplify implementation, we list all associations
     * found with any of the Classifiers
     * represented by the linked Instances. <p>
     *
     * TODO: Make a foolproof algorithm that only allows selecting associations
     * that create a correct model. Also take into account n-ary associations
     * and associationclasses. This algo best goes in the model subsystem, e.g.
     * in a method getAllPossibleAssociationsForALink().
     *
     * @see org.argouml.uml.ui.UMLComboBoxModel2#buildModelList()
     */
    protected void buildModelList() {
        Collection linkEnds;
        Collection associations = new HashSet();
        Object t = getTarget();
        if (Model.getFacade().isALink(t)) {
            linkEnds = Model.getFacade().getConnections(t);
            Iterator ile = linkEnds.iterator();
            while (ile.hasNext()) {
                Object instance = Model.getFacade().getInstance(ile.next());
                Collection c = Model.getFacade().getClassifiers(instance);
                Iterator ic = c.iterator();
                while (ic.hasNext()) {
                    Object classifier = ic.next();
                    Collection ae =
                        Model.getFacade().getAssociationEnds(classifier);
                    Iterator iae = ae.iterator();
                    while (iae.hasNext()) {
                        Object associationEnd = iae.next();
                        Object association =
                            Model.getFacade().getAssociation(associationEnd);
                        associations.add(association);
                    }
                }
            }
        }
        setElements(associations);
    }

    /*
     * @see org.argouml.uml.ui.UMLComboBoxModel2#getSelectedModelElement()
     */
    protected Object getSelectedModelElement() {
        if (Model.getFacade().isALink(getTarget())) {
            return Model.getFacade().getAssociation(getTarget());
        }
        return null;
    }

    /*
     * @see org.argouml.uml.ui.UMLComboBoxModel2#modelChanged(org.argouml.model.UmlChangeEvent)
     */
    @Override
    public void modelChanged(UmlChangeEvent evt) {
        /*
         * Rebuild the list from scratch to be sure it's correct.
         */
        Object t = getTarget();
        if (t != null
                && evt.getSource() == t
                && evt.getNewValue() != null) {
            buildModelList();
            /* In some cases (se issue 3780) the list remains the same, but
             * the selected item differs. Without the next step,
             * the combo would not be refreshed.
             */
            setSelectedItem(getSelectedModelElement());
        }
    }

    /**
     * The UID.
     */
    private static final long serialVersionUID = 3232437122889409351L;
}
