org.androidpn.server.xmpp.router.MessageRouter.java Source code

Introduction

Here is the source code for org.androidpn.server.xmpp.router.MessageRouter.java

Source

/*
 * Copyright (C) 2010 Moduad Co., Ltd.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
package org.androidpn.server.xmpp.router;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.androidpn.server.message.MessageConfirmHandler;
import org.androidpn.server.message.MessageHandler;
import org.androidpn.server.message.MessageVideoHandler;
import org.androidpn.server.message.SingleMessageHandler;
import org.androidpn.server.xmpp.handler.IQHandler;
import org.androidpn.server.xmpp.session.ClientSession;
import org.androidpn.server.xmpp.session.Session;
import org.androidpn.server.xmpp.session.SessionManager;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.dom4j.Element;
import org.xmpp.packet.IQ;
import org.xmpp.packet.JID;
import org.xmpp.packet.Message;
import org.xmpp.packet.PacketError;
import org.xmpp.packet.Presence;

/** 
 * This class is to route Message packets to their corresponding handler.
 *
 * @author Sehwan Noh (devnoh@gmail.com)
 */
public class MessageRouter {

    private final Log log = LogFactory.getLog(getClass());

    private SessionManager sessionManager;

    private List<MessageHandler> messageHandlers = new ArrayList<MessageHandler>();

    private Map<String, MessageHandler> namespace2Handlers = new ConcurrentHashMap<String, MessageHandler>();

    /**
     * Constucts a packet router.
     */
    public MessageRouter() {
        sessionManager = SessionManager.getInstance();
        messageHandlers.add(new SingleMessageHandler());
        messageHandlers.add(new MessageConfirmHandler());
        messageHandlers.add(new MessageVideoHandler());
    }

    /**
     * Routes the Message packet.
     * 
     * @param packet the packet to route
     */
    public void route(Message packet) {
        if (packet == null) {
            throw new NullPointerException();
        }
        ClientSession session = sessionManager.getSession(packet.getFrom());
        if (session != null && session.getStatus() == Session.STATUS_AUTHENTICATED
                || ("jabber:message:message".equals(packet.getElement().getNamespace().toString()))) {
            handle(packet);
        } else {
            // FIXME ??, session.process ?,??,
            packet.setTo(session.getAddress());
            packet.setFrom((JID) null);
            packet.setError(PacketError.Condition.not_authorized);
            session.process(packet);
        }
    }

    /**
     * handle send message
     * @param packet
     */
    private void handle(Message packet) {

        Element element = packet.getElement();
        String namespace = null;
        if (element != null) {
            namespace = element.getNamespaceURI();
        }
        if (namespace == null) {
            Message.Type type = packet.getType();
            if (type == null || Message.Type.error == type || packet.getTo() != null) {
                log.warn("Unknown Message type");
            }
        } else {
            MessageHandler handler = getHandler(namespace);
            if (handler == null) {
                sendErrorPacket(packet, PacketError.Condition.service_unavailable);
            } else {
                handler.process(packet);
            }
        }

    }

    /**
     * Senda the error packet to the original sender
     */
    private void sendErrorPacket(Message originalPacket, PacketError.Condition condition) {
        if (Message.Type.error == originalPacket.getType()) {
            log.error("Cannot reply an IQ error to another IQ error: " + originalPacket);
            return;
        }
        /*originalPacket.
        IQ reply = IQ.createResultIQ(originalPacket);
        reply.setChildElement(originalPacket.getChildElement().createCopy());
        reply.setError(condition);
        try {
        PacketDeliverer.deliver(reply);
        } catch (Exception e) {
        // Ignore
        }*/
    }

    /**
     * Returns an IQHandler with the given namespace.
     */
    private MessageHandler getHandler(String namespace) {
        MessageHandler handler = namespace2Handlers.get(namespace);
        if (handler == null) {
            for (MessageHandler handlerCandidate : messageHandlers) {
                if (namespace.equalsIgnoreCase(handlerCandidate.getNamespace())) {
                    handler = handlerCandidate;
                    namespace2Handlers.put(namespace, handler);
                    break;
                }
            }
        }
        return handler;
    }
}