/*
* This file is part of the WfMOpen project.
* Copyright (C) 2001-2005 Danet GmbH (www.danet.de), BU BTS.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: SaxEventBufferConverter.java 1607 2006-09-29 12:32:13Z drmlipp $
*
* $Log$
* Revision 1.2 2006/09/08 11:20:40 drmlipp
* Improved error messages.
*
* Revision 1.1 2006/09/07 15:02:57 drmlipp
* Added.
*
*/
package de.danet.an.workflow.clients.mgmtportlets.util.jsf;
import java.io.IOException;
import java.io.StringReader;
import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.ConverterException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.XMLFilterImpl;
import de.danet.an.util.jsf.JSFUtil;
import de.danet.an.util.sax.SAXContentBuffer;
import de.danet.an.util.sax.XmlnsUrisPatcher;
import de.danet.an.workflow.util.SAXEventBufferImpl;
/**
* This class provides a converter for the <code>SAXEventBuffer</code> type.
*
* @author Michael Lipp
*/
public class SaxEventBufferConverter implements Converter {
/* (non-Javadoc)
* @see javax.faces.convert.Converter#getAsObject
*/
public Object getAsObject
(FacesContext facesContext, UIComponent component, String value)
throws ConverterException {
try {
SAXParserFactory pf = SAXParserFactory.newInstance();
pf.setValidating (false);
pf.setNamespaceAware (true);
pf.setFeature
("http://xml.org/sax/features/namespace-prefixes", true);
XMLReader reader = null;
try {
pf.setFeature ("http://xml.org/sax/features/xmlns-uris", true);
SAXParser parser = pf.newSAXParser();
reader = parser.getXMLReader();
} catch (SAXException e) {
SAXParser parser = pf.newSAXParser();
reader = new XmlnsUrisPatcher (parser.getXMLReader());
}
SAXEventBufferImpl res = new SAXEventBufferImpl ();
// Create temporary root element to make sure
// that structure is well formed.
XMLFilterImpl filter = new XMLFilterImpl () {
private int level = 0;
public void startElement
(String uri, String localName, String qName,
Attributes atts) throws SAXException {
if (level > 0) {
super.startElement (uri,localName,qName,atts);
}
level += 1;
}
public void endElement
(String uri, String localName, String qName)
throws SAXException{
level -= 1;
if (level > 0) {
super.endElement (uri, localName, qName);
}
}
};
filter.setContentHandler (res);
reader.setContentHandler (filter);
InputSource inSrc = new InputSource
(new StringReader
("<temporary-root>" + value + "</temporary-root>"));
reader.parse(inSrc);
return res;
} catch (ParserConfigurationException e) {
throw new ConverterException (e);
} catch (IOException e) {
throw new ConverterException (e);
} catch (SAXException e) {
String summary = JSFUtil.getApplicationMessage
("javax.faces.component.UIInput.CONVERSION");
throw new ConverterException
(new FacesMessage
(FacesMessage.SEVERITY_ERROR, summary, e.getMessage()));
}
}
/* (non-Javadoc)
* @see javax.faces.convert.Converter#getAsString
*/
public String getAsString
(FacesContext facesContext, UIComponent component, Object value)
throws ConverterException {
return ((SAXContentBuffer)value).toString(true);
}
}