// **********************************************************************// // <copyright>// //  BBN Technologies//  10 Moulton Street//  Cambridge, MA 02138//  (617) 873-8000// //  Copyright (C) BBNT Solutions LLC. All rights reserved.// // </copyright>// **********************************************************************// // $Source: /cvs/distapps/openmap/src/openmap/com/bbn/openmap/event/ZoomSupport.java,v $// $RCSfile: ZoomSupport.java,v $// $Revision: 1.3.2.1 $// $Date: 2004/10/14 18:26:46 $// $Author: dietrick $// // **********************************************************************package com.bbn.openmap.event;import java.util.Iterator;/** * This is a utility class that can be used by beans that need support * for handling ZoomListeners and firing ZoomEvents. You can use an * instance of this class as a member field of your bean and delegate * work to it. */public class ZoomSupport extends ListenerSupport {    /**     * Construct a ZoomSupport.     *      * @param sourceBean The bean to be given as the source for any     *        events.     */    public ZoomSupport(Object sourceBean) {        super(sourceBean);    }    /**     * Add a ZoomListener to the listener list.     *      * @param listener The ZoomListener to be added     */    public synchronized void addZoomListener(ZoomListener listener) {        addListener(listener);    }    /**     * Remove a ZoomListener from the listener list.     *      * @param listener The ZoomListener to be removed     */    public synchronized void removeZoomListener(ZoomListener listener) {        removeListener(listener);    }    /**     * Send a zoom event to all registered listeners.     *      * @param zoomType Either ZoomEvent.RELATIVE or ZoomEvent.ABSOLUTE     * @param amount The new scale if ABSOLUTE, the multiplier if     *        RELATIVE     */    public void fireZoom(int zoomType, float amount) {        if (!((zoomType == ZoomEvent.RELATIVE) || (zoomType == ZoomEvent.ABSOLUTE))) {            throw new IllegalArgumentException("Bad value, " + zoomType                    + " for zoomType in " + "ZoomSupport.fireZoom()");        }        if (size() == 0)            return;        ZoomEvent evt = new ZoomEvent(source, zoomType, amount);        Iterator it = iterator();        while (it.hasNext()) {            ((ZoomListener) it.next()).zoom(evt);        }    }}