base24channel.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 java.net.SocketException;
import org.jpos.iso.*;

/**
 * Implements an ISOChannel able to exchange messages with
 * ACI's BASE24 over an X.25 link.<br>
 * An instance of this class exchanges messages by means of an
 * intermediate 'port server' as described in the
 * <a href="/doc/javadoc/overview-summary.html">Overview</a> page.
 * @author [e-mail]
 *
 * @version $Id: BASE24Channel.java,v 1.7 2002/05/03 11:03:38 apr Exp $
 *
 * @see ISOMsg
 * @see ISOException
 * @see ISOChannel
 */
public class BASE24Channel extends BaseChannel {
    /**
     * Public constructor (used by Class.forName("...").newInstance())
     */
    public BASE24Channel () {
        super();
    }
    /**
     * Construct client ISOChannel
     * @param host  server TCP Address
     * @param port  server port number
     * @param p     an ISOPackager
     * @see ISOPackager
     */
    public BASE24Channel (String host, int port, ISOPackager p) {
        super(host, port, p);
    }
    /**
     * Construct server ISOChannel
     * @param p     an ISOPackager
     * @see ISOPackager
     * @exception IOException
     */
    public BASE24Channel (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 BASE24Channel (ISOPackager p, ServerSocket serverSocket) 
        throws IOException
    {
        super(p, serverSocket);
    }
    /**
     * @param m the Message to send (in this case it is unused)
     * @param len   message len (ignored)
     * @exception IOException
     */
    protected void sendMessageTrailler(ISOMsg m, int len) throws IOException {
        serverOut.write (3);
    }
    /**
     * @return a byte array with the received message
     * @exception IOException
     */
    protected byte[] streamReceive() throws IOException {
        int i;
        byte[] buf = new byte[4096];
        for (i=0; i<4096; i++) {
            int c = -1;
            try {
                c = serverIn.read();
            } catch (SocketException e) { }
            if (c == 03)
                break;
            else if (c == -1)
                throw new EOFException("connection closed");
	    buf[i] = (byte) c;
        }
        if (i == 4096)
            throw new IOException("packet too long");

        byte[] d = new byte[i];
        System.arraycopy(buf, 0, d, 0, i);
        return d;
    }
}