// **********************************************************************// // <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/CenterSupport.java,v $// $RCSfile: CenterSupport.java,v $// $Revision: 1.4.2.1 $// $Date: 2004/10/14 18:26:44 $// $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 CenterListeners and firing CenterEvents You can use an * instance of this class as a member field of your bean and delegate * work to it. * <p> * A center event is one that sets the center of a map by specifying * latitude and longitude. */public class CenterSupport extends ListenerSupport {    /**     * @param sourceBean The bean to be given as the source for any     *        events     */    public CenterSupport(Object sourceBean) {        super(sourceBean);    }    /**     * Add a CenterListener to the listener list.     *      * @param listener The CenterListener to be added     */    public synchronized void addCenterListener(CenterListener listener) {        addListener(listener);    }    /**     * Remove a CenterListener from the listener list.     *      * @param listener The CenterListener to be removed     */    public synchronized void removeCenterListener(CenterListener listener) {        removeListener(listener);    }    /**     * Send a center event to all registered listeners.     *      * @param latitude the latitude     * @param longitude the longitude     * @see CenterEvent     */    public synchronized void fireCenter(float latitude, float longitude) {        Iterator it = iterator();        if (size() == 0)            return;        CenterEvent evt = new CenterEvent(source, latitude, longitude);        while (it.hasNext()) {            ((CenterListener) it.next()).center(evt);        }    }}