/*    This file is part of Peers.    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 3 of the License, or    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, see <http://www.gnu.org/licenses/>.        Copyright 2007, 2008 Yohann Martineau */package net.sourceforge.peers.sip.transport;import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;import java.net.SocketException;import net.sourceforge.peers.Logger;import net.sourceforge.peers.sip.RFC3261;import net.sourceforge.peers.sip.Utils;public class UdpMessageSender extends MessageSender {    private DatagramSocket datagramSocket;        public UdpMessageSender(InetAddress inetAddress, int port,            DatagramSocket datagramSocket)            throws SocketException {        super(inetAddress, port);        this.datagramSocket = datagramSocket;        StringBuffer buf = new StringBuffer();        //buf.append(datagramSocket.getLocalAddress().getHostAddress());        buf.append(Utils.getInstance().getMyAddress().getHostAddress());        buf.append(RFC3261.TRANSPORT_PORT_SEP);        buf.append(datagramSocket.getLocalPort());        buf.append(RFC3261.PARAM_SEPARATOR);        buf.append(RFC3261.PARAM_TRANSPORT);        buf.append(RFC3261.PARAM_ASSIGNMENT);        buf.append(RFC3261.TRANSPORT_UDP);        contact = buf.toString();        localPort = datagramSocket.getLocalPort();    }    @Override    public synchronized void sendMessage(SipMessage sipMessage) throws IOException {        byte[] buf = sipMessage.toString().getBytes();        DatagramPacket packet = new DatagramPacket(buf, buf.length, inetAddress,                port);        datagramSocket.send(packet);        Logger.getInstance().traceNetwork(new String(packet.getData()), "SENT");    }}