/*
* Copyright (C) 2005 Luca Veltri - University of Parma - Italy
*
* This file is part of MjSip (http://www.mjsip.org)
*
* MjSip 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.
*
* MjSip 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 MjSip; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author(s):
* Luca Veltri (luca.veltri@unipr.it)
*/
package org.zoolu.sip.provider;
import org.zoolu.net.*;
import org.zoolu.sip.message.Message;
import java.io.IOException;
/** UdpTransport provides an UDP transport service for SIP.
*/
class UdpTransport implements Transport, UdpProviderListener
{
/** UDP protocol type */
public static final String PROTO_UDP="udp";
/** UDP provider */
UdpProvider udp_provider;
/** The protocol type */
String proto;
/** Transport listener */
TransportListener listener;
/** Creates a new UdpTransport */
public UdpTransport(int port, TransportListener listener) throws IOException
{ this.listener=listener;
UdpSocket socket=new UdpSocket(port);
udp_provider=new UdpProvider(socket,this);
}
/** Creates a new UdpTransport */
public UdpTransport(int port, IpAddress ipaddr, TransportListener listener) throws IOException
{ this.listener=listener;
UdpSocket socket=new UdpSocket(port,ipaddr);
udp_provider=new UdpProvider(socket,this);
}
/** Creates a new UdpTransport */
public UdpTransport(UdpSocket socket, TransportListener listener)
{ this.listener=listener;
udp_provider=new UdpProvider(socket,this);
}
/** Gets protocol type */
public String getProtocol()
{ return PROTO_UDP;
}
/** Sends a Message to a destination address and port */
public void sendMessage(Message msg, IpAddress dest_ipaddr, int dest_port) throws IOException
{ if (udp_provider!=null)
{ byte[] data=msg.toString().getBytes();
UdpPacket packet=new UdpPacket(data,data.length);
packet.setIpAddress(dest_ipaddr);
packet.setPort(dest_port);
udp_provider.send(packet);
}
}
/** Stops running */
public void halt()
{ if (udp_provider!=null) udp_provider.halt();
}
/** Gets a String representation of the Object */
public String toString()
{ if (udp_provider!=null) return udp_provider.toString();
else return null;
}
//************************* Callback methods *************************
/** When a new UDP datagram is received. */
public void onReceivedPacket(UdpProvider udp, UdpPacket packet)
{ Message msg=new Message(packet);
msg.setRemoteAddress(packet.getIpAddress().toString());
msg.setRemotePort(packet.getPort());
msg.setTransport(PROTO_UDP);
if (listener!=null) listener.onReceivedMessage(this,msg);
}
/** When DatagramService stops receiving UDP datagrams. */
public void onServiceTerminated(UdpProvider udp, Exception error)
{ if (listener!=null) listener.onTransportTerminated(this,error);
UdpSocket socket=udp.getUdpSocket();
if (socket!=null) try { socket.close(); } catch (Exception e) {}
this.udp_provider=null;
this.listener=null;
}
}