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jPOS is an ISO-8583 based financial transaction library/framework that can be customized and extended in order to implement financial interchanges.
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/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2013 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 */

package org.jpos.iso.packager;

import org.jpos.iso.*;
import org.jpos.util.LogEvent;
import org.jpos.util.Logger;

import java.util.BitSet;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * ISO 8583 v1987 BINARY Packager 
 * customized for VISA Base1 subfields
 * 
 *
 * @author Eoin Flood
 * @version $Id$
 * @see ISOPackager
 * @see ISOBasePackager
 * @see ISOComponent
 */

public class Base1SubFieldPackager extends ISOBasePackager 
{
    // These methods are identical to ISOBasePackager
    // except that fld[1] has been replaced with fld[0]
    // and a secondard bitmap is not allowed

    protected boolean emitBitMap()
    {
        return (fld[0] instanceof ISOBitMapPackager);
    }

    protected int getFirstField()
    {
        return (fld[0] instanceof ISOBitMapPackager) ? 1 : 0;
    }

    protected ISOFieldPackager getBitMapfieldPackager() 
    {
        return fld[0];
    }

    /**
     * Unpack a packed subfield into
     * its corresponding ISOComponent
     */

    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;
            ISOBitMap bitmap = new ISOBitMap (-1);

            BitSet bmap = null;
            int maxField = fld.length;
            if (emitBitMap()) 
            {
                consumed += getBitMapfieldPackager().unpack(bitmap,b,consumed);
                bmap = (BitSet) bitmap.getValue();
                m.set (bitmap);
                maxField = bmap.size();
            }
            for (int i=getFirstField(); i l = new ArrayList();
            Map fields = m.getChildren();
            int len = 0;

            if (emitBitMap()) 
            {
                // BITMAP (-1 in HashTable)
                c = (ISOComponent) fields.get (Integer.valueOf(-1));
                byte[] b = getBitMapfieldPackager().pack(c);
                len += b.length;
                l.add(b);
            }

            for (int i=getFirstField(); i<=m.getMaxField(); i++) 
            {
                if ((c = (ISOComponent) fields.get (Integer.valueOf(i))) != null)
                {
                    try 
                    {
                        byte[] b = fld[i].pack(c);
                        len += b.length;
                        l.add(b);
                    } 
                    catch (Exception e) 
                    {
                        evt.addMessage ("error packing field "+i);
                        evt.addMessage (c);
                        evt.addMessage (e);
                    }
                }
            }
            int k = 0;
            byte[] d = new byte[len];
            for (byte[] b :l) {
                System.arraycopy(b, 0, d, k, b.length);
                k += b.length;
            }
            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);
        }
    }
}