// $Id: ActionSetFlowSource.java,v 1.10 2004/09/19 21:06:25 mvw Exp $
// Copyright (c) 1996-99 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
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph appear in all copies.  This software program and
// documentation are copyrighted by The Regents of the University of
// California. The software program and documentation are supplied "AS
// IS", without any accompanying services from The Regents. The Regents
// does not warrant that the operation of the program will be
// uninterrupted or error-free. The end-user understands that the program
// was developed for research purposes and is advised not to rely
// exclusively on the program for any reason.  IN NO EVENT SHALL THE
// UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
// SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
// ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
// THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE. THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
// PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
// CALIFORNIA HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT,
// UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

// $header$
package org.argouml.uml.ui.foundation.core;

import java.awt.event.ActionEvent;
import java.util.Vector;

import org.argouml.i18n.Translator;
import org.argouml.model.ModelFacade;
import org.argouml.uml.ui.UMLChangeAction;
import org.argouml.uml.ui.UMLComboBox2;
/**
 * @since Oct 12, 2002
 * @author jaap.branderhorst@xs4all.nl
 * @stereotype singleton
 */
public class ActionSetFlowSource extends UMLChangeAction {

    private static final ActionSetFlowSource SINGLETON = 
        new ActionSetFlowSource();

    /**
     * Constructor for ActionSetElementOwnershipSpecification.
     */
    protected ActionSetFlowSource() {
        super(Translator.localize("Set"), true, NO_ICON);
    }   

    /**
     * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
     */
    public void actionPerformed(ActionEvent e) {
        super.actionPerformed(e);
        if (e.getSource() instanceof UMLComboBox2) {
            UMLComboBox2 source = (UMLComboBox2) e.getSource();
            Object target = source.getTarget();
            if (ModelFacade.isAFlow(target)) {
                Object flow = /*(MFlow)*/ target;
                Object old = null;
                if (!ModelFacade.getSources(flow).isEmpty()) {
                    old = /*(MModelElement)*/ 
                        ModelFacade.getSources(flow).toArray()[0];
                }
                if (old != source.getSelectedItem()) {
                    if (source.getSelectedItem() != null) {
                        Vector sources = new Vector();
                        sources.add(source.getSelectedItem());
                        ModelFacade.setSources(flow, sources);
                    }
                }
            }
        }
    }

    /**
     * @return Returns the SINGLETON.
     */
    public static ActionSetFlowSource getInstance() {
        return SINGLETON;
    }

}