/** * $RCSfile$ * $Revision: $ * $Date: $ * * Copyright (C) 2007 Jive Software. All rights reserved. * * This software is published under the terms of the GNU Public License (GPL), * a copy of which is included in this distribution. */ package org.jivesoftware.openfire.user; import org.xmpp.packet.Presence; import java.util.List; import java.util.concurrent.CopyOnWriteArrayList; /** * Dispatches presence events of remote users. The following events are supported: * <ul> * <li><b>remoteUserAvailable</b> --> A remote user is now available.</li> * <li><b>remoteUserUnavailable</b> --> A remote user is no longer available.</li> * </ul> * Use {@link #addListener(RemotePresenceEventListener)} and * {@link #removeListener(RemotePresenceEventListener)} to add or remove {@link RemotePresenceEventListener}. * * @author Armando Jagucki */ public class RemotePresenceEventDispatcher { private static List<RemotePresenceEventListener> listeners = new CopyOnWriteArrayList<RemotePresenceEventListener>(); /** * Registers a listener to receive events. * * @param listener the listener. */ public static void addListener(RemotePresenceEventListener listener) { if (listener == null) { throw new NullPointerException(); } listeners.add(listener); } /** * Unregisters a listener to receive events. * * @param listener the listener. */ public static void removeListener(RemotePresenceEventListener listener) { listeners.remove(listener); } /** * Notification message indicating that a remote user is now available or has changed * his available presence. This event is triggered when an available presence is received * by <tt>PresenceRouter</tt>. * * @param presence the received available presence. */ public static void remoteUserAvailable(Presence presence) { if (!listeners.isEmpty()) { for (RemotePresenceEventListener listener : listeners) { listener.remoteUserAvailable(presence); } } } /** * Notification message indicating that a remote user that was available is no longer * available. A remote user becomes unavailable when an unavailable presence is received. * by <tt>PresenceRouter</tt>. * * @param presence the received unavailable presence. */ public static void remoteUserUnavailable(Presence presence) { if (!listeners.isEmpty()) { for (RemotePresenceEventListener listener : listeners) { listener.remoteUserUnavailable(presence); } } } }