// $Id: ActionSetModelElementNamespace.java,v 1.11 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
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
// PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
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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.uml.ui.UMLChangeAction;
import org.argouml.uml.ui.UMLComboBox2;

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

    private static final ActionSetModelElementNamespace SINGLETON = 
        new ActionSetModelElementNamespace();

    /**
     * Constructor for ActionSetModelElementNamespace.
     */
    protected ActionSetModelElementNamespace() {
        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 oldNamespace = null;
        Object newNamespace = null;
        Object m = null;
        if (source instanceof UMLComboBox2) {
            UMLComboBox2 box = (UMLComboBox2) source;
            Object o = box.getTarget();
            if (org.argouml.model.ModelFacade.isAModelElement(o)) {
                m = /*(MModelElement)*/ o;
                oldNamespace = ModelFacade.getNamespace(m);
            }
            o = box.getSelectedItem();
            if (org.argouml.model.ModelFacade.isANamespace(o)) {
                newNamespace = /*(MNamespace)*/ o;
            }
        }
        if (newNamespace != oldNamespace && m != null && newNamespace != null) {
            ModelFacade.setNamespace(m, newNamespace);
            super.actionPerformed(e);
        }
    }



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

}