/*
 * 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.packager;

import java.util.*;

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

/**
 * EuroPay SubField packager
 * @author Eoin Flood
 * @version $Revision$ $Date$
 * @see ISOPackager
 * @see ISOBasePackager
 * @see ISOComponent
 *
 * This packager is used by EuroPackager to package subfields
 * such as field 48.
 */
public class EuroSubFieldPackager extends ISOBasePackager
{ 
    /** 
     * Default constructor
     */
    public EuroSubFieldPackager()
    {
	super();
    }

    /**
     * Always return false
     */
    protected boolean emitBitMap()
    {
	return false;
    }

    public byte[] pack (ISOComponent c) throws ISOException
    {
	try
	{
	    int len;
	    Hashtable tab = c.getChildren();
	    StringBuffer sb = new StringBuffer();

	    // Handle first Required IF_CHAR field
	    ISOField f0 = (ISOField) tab.get (new Integer(0));
	    String s = (String) f0.getValue();
	    sb.append (s);
	    for (int i =1; i<fld.length; i++) 
	    {
		ISOField f = (ISOField) tab.get (new Integer(i));
		if (f != null) 
		{
		    sb.append (new String(fld[i].pack(f)));
		}
	    }
	    return sb.toString().getBytes();
	}
	catch (Exception ex)
	{
	    throw new ISOException (ex);
	}
    }

    public int unpack (ISOComponent m, byte[] b) throws ISOException
    {
	LogEvent evt = new LogEvent (this, "unpack");
	// Unpack the IF_CHAR field
	int consumed = 0;
	ISOComponent c = fld[0].createComponent(0);
	consumed += fld[0].unpack (c, b, consumed);
	m.set(c);

	// Now unpack the IFEP_LLCHAR fields
	for (int i=1; consumed < b.length ; i++) 
	{
	    c = fld[i].createComponent(i);
	    consumed += fld[i].unpack (c, b, consumed);
	    if (logger != null) 
	    {
		evt.addMessage ("<unpack fld=\"" + i 
		    +"\" packager=\""
		    +fld[i].getClass().getName()+ "\">");
		    evt.addMessage ("  <value>" 
		    +c.getValue().toString()
		    + "</value>");
		evt.addMessage ("</unpack>");
	    }
	    m.set(c);
	}
	Logger.log (evt);
	return consumed;
    }
}


@@ -3171,17 +3171,8 @@
 rst 
-Required 
 IF_C
@@ -3237,17 +3237,51 @@
 er(0));%0A
-%09
+            if (f0 != null) %7B%0A%09    
     Stri
@@ -3312,24 +3312,28 @@
 lue();%0A%09    
+    
 sb.append (s
@@ -3335,16 +3335,30 @@
 nd (s);%0A
+            %7D%0A
 %09    for
@@ -3402,31 +3402,20 @@
 %7B%0A%09%09
-ISOField f = (ISOField)
+Object obj =
  tab
@@ -3447,23 +3447,83 @@
 if (
-f != null) %0A%09%09%7B
+obj instanceof ISOField) %7B%0A                    ISOField f = (ISOField) obj;
 %0A%09%09 
@@ -3568,16 +3568,17 @@
 )));%0A%09%09%7D
+ 
 %0A%09    %7D%0A
@@ -3857,17 +3857,24 @@
 ed = 0;%0A
-%09
+        
 ISOCompo
@@ -3878,16 +3878,61 @@
 mponent 
+c;%0A        if (fld%5B0%5D != null) %7B%0A            
 c = fld%5B
@@ -3954,17 +3954,28 @@
 ent(0);%0A
-%09
+            
 consumed
@@ -4014,18 +4014,39 @@
 d);%0A
-%09m.set(c);
+            m.set(c);%0A        %7D
 %0A%0A%09/
@@ -4123,24 +4123,82 @@
  ; i++) %0A%09%7B%0A
+            if (fld%5Bi%5D == null)%0A                continue;%0A
 %09    c = fld

Support for null fields in Field 48 definition (if you don't use a given tag, there's no need to configure it in your GenericPackager XML configuration).