// $Id: ActionSetModelElementStereotype.java,v 1.11 2004/09/19 21:06:25 mvw Exp $
// Copyright (c) 1996-2003 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.

package org.argouml.uml.ui.foundation.core;

import java.awt.event.ActionEvent;

import org.argouml.i18n.Translator;
import org.argouml.model.ModelFacade;
import org.argouml.model.uml.foundation.extensionmechanisms.ExtensionMechanismsHelper;
import org.argouml.model.uml.modelmanagement.ModelManagementHelper;
import org.argouml.uml.ui.UMLChangeAction;
import org.argouml.uml.ui.UMLComboBox2;

/**
 * @since Oct 10, 2002
 * @author jaap.branderhorst@xs4all.nl
 * @stereotype singleton
 */
public class ActionSetModelElementStereotype extends UMLChangeAction {

    private static final ActionSetModelElementStereotype SINGLETON = 
        new ActionSetModelElementStereotype();

    /**
     * Constructor for ActionSetModelElementStereotype.
     */
    protected ActionSetModelElementStereotype() {
        super(Translator.localize("Set"), true, NO_ICON);
    }
   
    /**
     * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
     */
    public void actionPerformed(ActionEvent e) {
        Object source = e.getSource();
        Object oldStereo = null;
        Object newStereo = null;
        Object target = null;
        if (source instanceof UMLComboBox2) {
            UMLComboBox2 combo = (UMLComboBox2) source;
            if (ModelFacade.isAStereotype(combo.getSelectedItem())) 
                newStereo = /*(MStereotype)*/ combo.getSelectedItem();
            if (ModelFacade.isAModelElement(combo.getTarget())) {
                target = /*(MModelElement)*/ combo.getTarget();
                oldStereo = null;
                if (ModelFacade.getStereotypes(target).size() > 0) {
                    oldStereo = ModelFacade.getStereotypes(target)
                        .iterator().next();
                }
            }
	    if ("".equals(combo.getSelectedItem()))
		newStereo = null;
        }
        if (newStereo != oldStereo && target != null) {
	    if (newStereo != null) {
		newStereo = /*(MStereotype)*/
		    ModelManagementHelper.getHelper().getCorrespondingElement(
				  newStereo,
				  ModelFacade.getModel(target));
	    }
            ExtensionMechanismsHelper.getHelper()
                .setStereoType(target, newStereo);
            super.actionPerformed(e);
        }
    }

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

}