/*
 * File    : PRUDPPacketReply.java
 * Created : 20-Jan-2004
 * By      : parg
 * 
 * Azureus - a Java Bittorrent client
 *
 * 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.
 *
 * 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 ( see the LICENSE file ).
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package com.aelitis.net.udp.uc;

/**
 * @author parg
 *
 */

import java.io.*;
import java.net.InetSocketAddress;
import java.util.*;

import org.gudy.azureus2.core3.util.AEMonitor;
import org.gudy.azureus2.core3.util.Debug;

public abstract class 
PRUDPPacketReply
	extends PRUDPPacket
{		
	public static final int	PR_HEADER_SIZE	= 8;
	
	private static AEMonitor				class_mon = new AEMonitor( "PRUDPPacketReply:class" );

	private static Map	packet_decoders	= new HashMap();
	
	public static void
	registerDecoders(
		Map		_decoders )
	{
		try{
			class_mon.enter();
		
			Map	new_decoders = new HashMap( packet_decoders );
			
			Iterator	it = _decoders.keySet().iterator();
			
			while( it.hasNext()){
				
				Integer action = (Integer)it.next();
				
				if ( packet_decoders.containsKey( action )){
					
					Debug.out( "Duplicate codec! " + action );
				}
			}
			
			new_decoders.putAll( _decoders );
			
			packet_decoders	= new_decoders;
			
		}finally{
			
			class_mon.exit();
		}
	}
	
	public
	PRUDPPacketReply(
		int		_action,
		int		_tran_id )
	{
		super( _action, _tran_id );
	}
	

	public void
	serialise(
		DataOutputStream	os )
	
		throws IOException
	{
			// add to this and you need to adjust HEADER_SIZE above
		
		os.writeInt( getAction());
		
		os.writeInt( getTransactionId() );
	}
	
	public static PRUDPPacketReply
	deserialiseReply(
		PRUDPPacketHandler	handler,
		InetSocketAddress	originator,
		DataInputStream		is )
	
		throws IOException
	{
		int		action			= is.readInt();
		
		PRUDPPacketReplyDecoder	decoder = (PRUDPPacketReplyDecoder)packet_decoders.get( new Integer( action ));
		
		if ( decoder == null ){
			
			throw( new IOException( "No decoder registered for action '" + action + "'" ));
		}
		
		int		transaction_id	= is.readInt();

		return( decoder.decode( handler, originator, is, action, transaction_id ));
	}
	
	public String
	getString()
	{
		return( super.getString() + ":reply[trans=" + getTransactionId() + "]" );
	}
}