isomsgfieldpackager.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;

/**
 * ISOMsgFieldPackager is a packager able to pack compound ISOMsgs
 * (one message inside another one, and so on...)
 *
 * @author [e-mail]
 * @version $Id: ISOMsgFieldPackager.java,v 1.10 2001/05/02 10:38:16 apr Exp $
 * @see org.jpos.iso.packager.PostPackager
 */
public class ISOMsgFieldPackager extends ISOFieldPackager {
    protected ISOPackager msgPackager;
    protected ISOFieldPackager fieldPackager;
    /**
     * @param fieldPackager low level field packager
     * @param msgPackager ISOMsgField default packager
     */
    public ISOMsgFieldPackager (
            ISOFieldPackager fieldPackager,
            ISOPackager msgPackager)
    {
        super(fieldPackager.getLength(), fieldPackager.getDescription());
        this.msgPackager = msgPackager;
        this.fieldPackager = fieldPackager;
    }
    /**
     * @param c - a component
     * @return packed component
     * @exception ISOException
     */
    public byte[] pack (ISOComponent c) throws ISOException {
        if (c instanceof ISOMsg) {
            ISOMsg m = (ISOMsg) c;
            m.recalcBitMap();
            ISOBinaryField f = new ISOBinaryField(0, msgPackager.pack(m));
            return fieldPackager.pack(f);
        }
        return fieldPackager.pack(c);
    }

    /**
     * @param c - the Component to unpack
     * @param b - binary image
     * @param offset - starting offset within the binary image
     * @return consumed bytes
     * @exception ISOException
     */
    public int unpack (ISOComponent c, byte[] b, int offset)
        throws ISOException
    {
        ISOBinaryField f = new ISOBinaryField(0);
        int consumed = fieldPackager.unpack(f, b, offset);
	if (c instanceof ISOMsg) 
	    msgPackager.unpack((ISOMsg) c, (byte[]) f.getValue());
        return consumed;
    }
    public ISOComponent createComponent(int fieldNumber) {
        ISOMsg m = new ISOMsg(fieldNumber);
        m.setPackager(msgPackager);
        return m;
    }
    public int getMaxPackedLength() {
        return fieldPackager.getLength();
    }
}