vapchannel.java

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/*
 * Copyright (c) 2000 jPOS.org.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *    "This product includes software developed by the jPOS project 
 *    (http://www.jpos.org/)". Alternately, this acknowledgment may 
 *    appear in the software itself, if and wherever such third-party 
 *    acknowledgments normally appear.
 *
 * 4. The names "jPOS" and "jPOS.org" must not be used to endorse 
 *    or promote products derived from this software without prior 
 *    written permission. For written permission, please contact 
 *    [e-mail].
 *
 * 5. Products derived from this software may not be called "jPOS",
 *    nor may "jPOS" appear in their name, without prior written
 *    permission of the jPOS project.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  
 * IN NO EVENT SHALL THE JPOS PROJECT OR ITS CONTRIBUTORS BE LIABLE FOR 
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the jPOS Project.  For more
 * information please see <http://www.jpos.org/>.
 */

package org.jpos.iso.channel;

import java.io.*;
import java.util.*;
import java.net.ServerSocket;
import java.net.Socket;
import org.jpos.iso.*;
import org.jpos.util.Logger;
import org.jpos.util.LogEvent;
import org.jpos.core.Configuration;
import org.jpos.core.ConfigurationException;
import org.jpos.iso.header.BASE1Header;

/**
 * ISOChannel implementation - VISA's VAP framing
 *
 * @author [e-mail]
 * @version $Id: VAPChannel.java,v 1.7 2001/09/24 11:25:41 eflood Exp $
 * @see ISOMsg
 * @see ISOException
 * @see ISOChannel
 */
public class VAPChannel extends BaseChannel {
    String srcid, dstid;
    /**
     * Public constructor (used by Class.forName("...").newInstance())
     */
    public VAPChannel () {
        super();
	srcid = "000000";
	dstid = "000000";
    }
    /**
     * Construct client ISOChannel
     * @param host  server TCP Address
     * @param port  server port number
     * @param p     an ISOPackager (should be ISO87BPackager)
     * @param hlen  the header len
     * @see org.jpos.iso.packager.ISO87BPackager
     */
    public VAPChannel (String host, int port, ISOPackager p) {
        super(host, port, p);
    }
    /**
     * Construct server ISOChannel
     * @param p     an ISOPackager (should be ISO87BPackager)
     * @param hlen  the header len
     * @exception IOException
     * @see org.jpos.iso.packager.ISO87BPackager
     */
    public VAPChannel (ISOPackager p) throws IOException {
        super(p);
    }
    /**
     * constructs a server ISOChannel associated with a Server Socket
     * @param p     an ISOPackager
     * @param serverSocket where to accept a connection
     * @exception IOException
     * @see ISOPackager
     */
    public VAPChannel (ISOPackager p, ServerSocket serverSocket) 
        throws IOException
    {
        super(p, serverSocket);
    }

    /**
     * The default header for VAPChannel is BASE1Header
     */
    protected ISOHeader getDynamicHeader (byte[] image) {
    	return new BASE1Header (image);
    }

    protected void sendMessageLength(int len) throws IOException {
        serverOut.write (len >> 8);
        serverOut.write (len);
        serverOut.write (0);
        serverOut.write (0);
    }
    /**
     * @param   m   the message
     * @param   len already packed message len (to avoid re-pack)
     * @exception IOException
     */
    protected void sendMessageHeader(ISOMsg m, int len) 
        throws IOException
    {
        ISOHeader h = (m.getHeader() != null) ?
		m.getISOHeader() :
		new BASE1Header (srcid, dstid);

        if (h instanceof BASE1Header)
            ((BASE1Header)h).setLen(len);

        serverOut.write(h.pack());
    }
    protected int getMessageLength() throws IOException, ISOException {
        int l = 0;
        byte[] b = new byte[4];
        // ignore VAP polls (0 message length)
        while (l == 0) {
            serverIn.readFully(b,0,4);
            l = ((((int)b[0])&0xFF) << 8) | (((int)b[1])&0xFF);
            if (l == 0) {
                serverOut.write(b);
                serverOut.flush();
		Logger.log (new LogEvent (this, "poll"));
            }
        }
        return l;
    }

    protected int getHeaderLength() {
        return BASE1Header.LENGTH;
    }
	
    protected boolean isRejected(byte[] b) {
        BASE1Header h = new BASE1Header(b);
        return h.isRejected() || (h.getHLen() != BASE1Header.LENGTH);
    }

    /**
     * sends an ISOMsg over the TCP/IP session<br>
     * swap source/destination addresses in BASE1Header if
     * a reply message is detected.<br>
     * Sending an incoming message is seen as a reply.
     *
     * @param m the Message to be sent
     * @exception IOException
     * @exception ISOException
     * @see ISOChannel#send
     */
    public void send (ISOMsg m) throws IOException, ISOException
    {
        if (m.isIncoming() && m.getHeader() != null) {
            BASE1Header h = new BASE1Header(m.getHeader());
            h.swapDirection();
        }
        super.send(m);
    }

    public void setConfiguration (Configuration cfg)
	throws ConfigurationException 
    {
	srcid = cfg.get ("srcid", "000000");
	dstid = cfg.get ("dstid", "000000");
	super.setConfiguration (cfg);
    }
}