package com.wickedcooljava.xml;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;
import org.xml.sax.helpers.XMLFilterImpl;

/*
Example code from Wicked Cool Java (No Starch Press)
Copyright (C) 2005 Brian D. Eubanks

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

Note: The LGPL licence can be found online at http://www.gnu.org

*/
/**
 * This class implements an XML filter that adds a signedBy attrbiute
 * to every tag. 
 */
public class SignatureFilter
extends XMLFilterImpl
{
    public void startElement(String url, String localName, String qName,
        Attributes att)
    throws SAXException {
       AttributesImpl moreAtt = new AttributesImpl(att);
       moreAtt.addAttribute("", "signedBy", "signedBy", "CDATA", 
                            "SignatureFilter");
       super.startElement(url, localName, qName, moreAtt);
    }
}