/* * 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  *    license@jpos.org. * * 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.IOException;import java.net.ServerSocket;import org.jpos.iso.BaseChannel;import org.jpos.iso.ISOException;import org.jpos.iso.ISOPackager;import org.jpos.iso.ISOUtil;/** * ISOChannel implementation suitable for OASIS Ltd &copy; hosts<br> * (four ASCII characters header indicating message length) * * @author apr@cs.com.uy * @version $Id: ASCIIChannel.java,v 1.7 2003/06/04 23:15:38 apr Exp $ * @see ISOMsg * @see ISOException * @see ISOChannel */public class ASCIIChannel extends BaseChannel {    /**     * Public constructor (used by Class.forName("...").newInstance())     */    public ASCIIChannel () {        super();    }    /**     * Construct client ISOChannel     * @param host  server TCP Address     * @param port  server port number     * @param p     an ISOPackager     * @see ISOPackager     */    public ASCIIChannel (String host, int port, ISOPackager p) {        super(host, port, p);    }    /**     * Construct server ISOChannel     * @param p     an ISOPackager     * @exception IOException     * @see ISOPackager     */    public ASCIIChannel (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 ASCIIChannel (ISOPackager p, ServerSocket serverSocket)         throws IOException    {        super(p, serverSocket);    }    /**     * @param len the packed Message len     * @exception IOException     */    protected void sendMessageLength(int len) throws IOException {        if (len > 9999)            throw new IOException ("len exceeded");        try {            serverOut.write(                ISOUtil.zeropad(Integer.toString(len), 4).getBytes()            );        } catch (ISOException e) { }    }    /**     * @return the Message len     * @exception IOException, ISOException     */    protected int getMessageLength() throws IOException, ISOException {        int l = 0;        byte[] b = new byte[4];        while (l == 0) {            serverIn.readFully(b,0,4);            try {                if ((l=Integer.parseInt(new String(b))) == 0) {                    serverOut.write(b);                    serverOut.flush();                }            } catch (NumberFormatException e) {                 throw new ISOException ("Invalid message length "+new String(b));            }        }        return l;    }}