/*
 * Copyright (c) 2005, Stanford University. All rights reserved. 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions
 * are met: 
 *  - Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *  - Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 *  - Neither the name of the Stanford University nor the names of its 
 *    contributors may be used to endorse or promote products derived 
 *    from this software without specific prior written permission. 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE. 
 */

/*
 * Created on Jun 30, 2005
 *
 */
package org.simtk.util;

import java.util.*;

/**
 *  
  * @author Christopher Bruns
  * 
  * When an item is selected in the user interface, objects can register
  * to learn about the seletion through this object.
 */
public class SelectionBroadcaster {
    protected Set<SelectionListener> listeners = new HashSet<SelectionListener>();
    protected Set<Selectable> selectedObjects = new HashSet<Selectable>();

    public void addSelectionListener(SelectionListener l) {listeners.add(l);}

    public void fireSelect(Selectable s) {
        for (Iterator i = listeners.iterator(); i.hasNext(); ) {
            SelectionListener l = (SelectionListener) i.next();
            l.select(s);
        }
        selectedObjects.add(s);
    }
    public void fireUnSelect() {
        for (Iterator i = listeners.iterator(); i.hasNext(); ) {
            SelectionListener l = (SelectionListener) i.next();
            l.unSelect();
        }
        selectedObjects.clear();
    }
    public void fireUnSelect(Selectable s) {
        for (Iterator i = listeners.iterator(); i.hasNext(); ) {
            SelectionListener l = (SelectionListener) i.next();
            l.unSelect(s);
        }
        selectedObjects.remove(s);
    }
    
    /** 
     * 
     * Return a list of those objects that have been selected through this object
     */
    public Collection getSelected() {
        return selectedObjects;
    }
}