org.jivesoftware.smackx.RosterExchangeManager Maven / Gradle / Ivy

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Smack is an Open Source XMPP (Jabber) client library for instant messaging and presence. This library provides the client side functionality as specified in the core XMPP specifications as related to the client side of said specifications.
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/**
 * $RCSfile$
 * $Revision: 11613 $
 * $Date: 2010-02-09 05:55:56 -0600 (Tue, 09 Feb 2010) $
 *
 * Copyright 2003-2007 Jive Software.
 *
 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jivesoftware.smackx;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.jivesoftware.smack.PacketListener;
import org.jivesoftware.smack.Roster;
import org.jivesoftware.smack.RosterEntry;
import org.jivesoftware.smack.RosterGroup;
import org.jivesoftware.smack.Connection;
import org.jivesoftware.smack.filter.PacketExtensionFilter;
import org.jivesoftware.smack.filter.PacketFilter;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smackx.packet.RosterExchange;

/**
 *
 * Manages Roster exchanges. A RosterExchangeManager provides a high level access to send 
 * rosters, roster groups and roster entries to XMPP clients. It also provides an easy way
 * to hook up custom logic when entries are received from another XMPP client through 
 * RosterExchangeListeners.
 *
 * @author Gaston Dombiak
 */
public class RosterExchangeManager {

    private List rosterExchangeListeners = new ArrayList();

    private Connection con;

    private PacketFilter packetFilter = new PacketExtensionFilter("x", "jabber:x:roster");
    private PacketListener packetListener;

    /**
     * Creates a new roster exchange manager.
     *
     * @param con a Connection which is used to send and receive messages.
     */
    public RosterExchangeManager(Connection con) {
        this.con = con;
        init();
    }

    /**
     * Adds a listener to roster exchanges. The listener will be fired anytime roster entries
     * are received from remote XMPP clients.
     *
     * @param rosterExchangeListener a roster exchange listener.
     */
    public void addRosterListener(RosterExchangeListener rosterExchangeListener) {
        synchronized (rosterExchangeListeners) {
            if (!rosterExchangeListeners.contains(rosterExchangeListener)) {
                rosterExchangeListeners.add(rosterExchangeListener);
            }
        }
    }

    /**
     * Removes a listener from roster exchanges. The listener will be fired anytime roster 
     * entries are received from remote XMPP clients.
     *
     * @param rosterExchangeListener a roster exchange listener..
     */
    public void removeRosterListener(RosterExchangeListener rosterExchangeListener) {
        synchronized (rosterExchangeListeners) {
            rosterExchangeListeners.remove(rosterExchangeListener);
        }
    }

    /**
     * Sends a roster to userID. All the entries of the roster will be sent to the
     * target user.
     * 
     * @param roster the roster to send
     * @param targetUserID the user that will receive the roster entries
     */
    public void send(Roster roster, String targetUserID) {
        // Create a new message to send the roster
        Message msg = new Message(targetUserID);
        // Create a RosterExchange Package and add it to the message
        RosterExchange rosterExchange = new RosterExchange(roster);
        msg.addExtension(rosterExchange);

        // Send the message that contains the roster
        con.sendPacket(msg);
    }

    /**
     * Sends a roster entry to userID.
     * 
     * @param rosterEntry the roster entry to send
     * @param targetUserID the user that will receive the roster entries
     */
    public void send(RosterEntry rosterEntry, String targetUserID) {
        // Create a new message to send the roster
        Message msg = new Message(targetUserID);
        // Create a RosterExchange Package and add it to the message
        RosterExchange rosterExchange = new RosterExchange();
        rosterExchange.addRosterEntry(rosterEntry);
        msg.addExtension(rosterExchange);

        // Send the message that contains the roster
        con.sendPacket(msg);
    }

    /**
     * Sends a roster group to userID. All the entries of the group will be sent to the 
     * target user.
     * 
     * @param rosterGroup the roster group to send
     * @param targetUserID the user that will receive the roster entries
     */
    public void send(RosterGroup rosterGroup, String targetUserID) {
        // Create a new message to send the roster
        Message msg = new Message(targetUserID);
        // Create a RosterExchange Package and add it to the message
        RosterExchange rosterExchange = new RosterExchange();
        for (RosterEntry entry : rosterGroup.getEntries()) {
            rosterExchange.addRosterEntry(entry);
        }
        msg.addExtension(rosterExchange);

        // Send the message that contains the roster
        con.sendPacket(msg);
    }

    /**
     * Fires roster exchange listeners.
     */
    private void fireRosterExchangeListeners(String from, Iterator remoteRosterEntries) {
        RosterExchangeListener[] listeners = null;
        synchronized (rosterExchangeListeners) {
            listeners = new RosterExchangeListener[rosterExchangeListeners.size()];
            rosterExchangeListeners.toArray(listeners);
        }
        for (int i = 0; i < listeners.length; i++) {
            listeners[i].entriesReceived(from, remoteRosterEntries);
        }
    }

    private void init() {
        // Listens for all roster exchange packets and fire the roster exchange listeners.
        packetListener = new PacketListener() {
            public void processPacket(Packet packet) {
                Message message = (Message) packet;
                RosterExchange rosterExchange =
                    (RosterExchange) message.getExtension("x", "jabber:x:roster");
                // Fire event for roster exchange listeners
                fireRosterExchangeListeners(message.getFrom(), rosterExchange.getRosterEntries());
            };

        };
        con.addPacketListener(packetListener, packetFilter);
    }

    public void destroy() {
        if (con != null)
            con.removePacketListener(packetListener);

    }
    protected void finalize() throws Throwable {
        destroy();
        super.finalize();
    }
}