base1subfieldpackager.java

pos机交易实现源代码 含金融卡交易8583协议实现 开发环境：linux 典型应用：嵌入系统开发 仅供参考

/*
 * Copyright (c) 2000 jPOS.org.  All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 * 2. Redistributions in binary form must reproduce the above copyright
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 * 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.
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 * 4. The names "jPOS" and "jPOS.org" must not be used to endorse 
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 * 5. Products derived from this software may not be called "jPOS",
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * ====================================================================
 *
 * 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.packager;

import org.jpos.iso.*;
import org.jpos.util.*;
import java.util.*;

/**
 * ISO 8583 v1987 BINARY Packager 
 * customized for VISA Base1 subfields
 * 
 *
 * @author <a href="mailto:[e-mail]">Eoin Flood</a>
 * @version $Id: Base1SubFieldPackager.java,v 1.2 2000/11/02 12:09:18 apr Exp $
 * @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<maxField; i++) 
            {
                if (bmap == null || bmap.get(i)) 
                {
                    ISOComponent c = fld[i].createComponent(i);
                    consumed += fld[i].unpack (c, b, consumed);
                    m.set(c);
                }
            }
            if (b.length != consumed) 
            {
                evt.addMessage (
                "WARNING: unpack len=" +b.length +" consumed=" +consumed);
            }
            return consumed;
        } 
        catch (ISOException e) 
        {
            evt.addMessage (e);
            throw e;
        } 
        finally 
        {
            Logger.log (evt);
        }
    }

    /**
     * Pack the subfield into a byte array
     */ 

    public byte[] pack (ISOComponent m) throws ISOException 
    {
        LogEvent evt = new LogEvent (this, "pack");
        try 
        {
            ISOComponent c;
            Vector v = new Vector();
            Hashtable fields = m.getChildren();
            int len = 0;
            byte[] b;

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

            for (int i=getFirstField(); i<=m.getMaxField(); i++) 
            {
                if ((c = (ISOComponent) fields.get (new Integer (i))) != null) 
                {
                    try 
                    {
                        b = fld[i].pack(c);
                        len += b.length;
                        v.addElement (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 (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);
        }
    }
}