isobasepackager.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;

import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.util.BitSet;
import java.util.Hashtable;
import java.util.Vector;

import org.jpos.util.LogEvent;
import org.jpos.util.LogSource;
import org.jpos.util.Logger;

/**
 * provides base functionality for the actual packagers
 *
 * @author [e-mail]
 * @version $Id: ISOBasePackager.java,v 1.44 2004/04/12 22:12:51 apr Exp $
 * @see org.jpos.iso.packager.ISO87APackager
 * @see org.jpos.iso.packager.ISO87BPackager
 */
public abstract class ISOBasePackager implements ISOPackager, LogSource {
    protected ISOFieldPackager[] fld;

    protected Logger logger = null;
    protected String realm = null;

    public void setFieldPackager (ISOFieldPackager[] fld) {
        this.fld = fld;
    }
    /**
     * @return true if BitMap have to be emited
     */
    protected boolean emitBitMap () {
        return (fld[1] instanceof ISOBitMapPackager);
    }
    /**
     * usually 2 for normal fields, 1 for bitmap-less
     * or ANSI X9.2 
     * @return first valid field
     */
    protected int getFirstField() {
        if (!(fld[0] instanceof ISOMsgFieldPackager))
            return (fld[1] instanceof ISOBitMapPackager) ? 2 : 1;
        return 0;
    }
    /**
     * @param   m   the Component to pack
     * @return      Message image
     * @exception ISOException
     */
    public byte[] pack (ISOComponent m) throws ISOException {
        LogEvent evt = new LogEvent (this, "pack");
        try {
            if (m.getComposite() != m) 
                throw new ISOException ("Can't call packager on non Composite");

            ISOComponent c;
            Vector v = new Vector();
            Hashtable fields = m.getChildren();
            int len = 0;
            int first = getFirstField();

            c = (ISOComponent) fields.get (new Integer (0));
            byte[] b;

            if (first > 0 && c != null) {
                b = fld[0].pack(c);
                len += b.length;
                v.addElement (b);
            }

            if (emitBitMap()) {
                // BITMAP (-1 in HashTable)
                c = (ISOComponent) fields.get (new Integer (-1));
                b = getBitMapfieldPackager().pack(c);
                len += b.length;
                v.addElement (b);
            }

            // if Field 1 is a BitMap then we are packing an
            // ISO-8583 message so next field is fld#2.
            // else we are packing an ANSI X9.2 message, first field is 1
            int tmpMaxField=Math.min (m.getMaxField(), 128);

            for (int i=first; i<=tmpMaxField; i++) {
                if ((c=(ISOComponent) fields.get (new Integer (i))) != null)
                {
                    try {
                        ISOFieldPackager fp = fld[i];
                        if (fp == null)
                            throw new ISOException ("null field packager");
                        b = fp.pack(c);
                        len += b.length;
                        v.addElement (b);
                    } catch (ISOException e) {
                        evt.addMessage ("error packing field "+i);
                        evt.addMessage (c);
                        evt.addMessage (e);
                        throw e;
                    }
                }
            }
        
            if(m.getMaxField()>128 && fld.length > 128) {
                for (int i=1; i<=64; i++) {
                    if ((c = (ISOComponent) 
                        fields.get (new Integer (i+128))) != null)
                    {
                        try {
                            b = fld[i+128].pack(c);
                            len += b.length;
                            v.addElement (b);
                        } catch (ISOException e) {
                            evt.addMessage ("error packing field "+(i+128));
                            evt.addMessage (c);
                            evt.addMessage (e);
                            throw e;
                        }
                    }
                }
            }

            int k = 0;
            byte[] d = new byte[len];
            for (int i=0; i<v.size(); i++) {
                b = (byte[]) v.elementAt(i);
                for (int j=0; j<b.length; j++)
                    d[k++] = b[j];
            }
            if (logger != null)  // save a few CPU cycle if no logger available
                evt.addMessage (ISOUtil.hexString (d));
            return d;
        } catch (ISOException e) {
            evt.addMessage (e);
            throw e;
        } finally {
            Logger.log(evt);
        }
    }

    /**
     * @param   m   the Container of this message
     * @param   b   ISO message image
     * @return      consumed bytes
     * @exception ISOException
     */
    public int unpack (ISOComponent m, byte[] b) throws ISOException {
        LogEvent evt = new LogEvent (this, "unpack");
        try {
            if (m.getComposite() != m) 
                throw new ISOException ("Can't call packager on non Composite");
            if (logger != null)  // save a few CPU cycle if no logger available
                evt.addMessage (ISOUtil.hexString (b));

            int consumed = 0;
            if (!(fld[0] instanceof ISOMsgFieldPackager) &&
                !(fld[0] instanceof ISOBitMapPackager))
            {
                ISOComponent mti = fld[0].createComponent(0);
                consumed  = fld[0].unpack(mti, b, 0);
                m.set (mti);
            }
            BitSet bmap = null;
            int maxField = fld.length;