/*******************************************************************************
$Source: /cvs/repositories/openii3/project/java/source/org/openeai/xml/XmlValidator.java,v $
$Revision: 1.9 $
*******************************************************************************/
/**********************************************************************
This file is part of the OpenEAI Application Foundation or
OpenEAI Message Object API created by Tod Jackson
(tod@openeai.org) and Steve Wheat (steve@openeai.org) at
the University of Illinois Urbana-Champaign.
Copyright (C) 2002 The OpenEAI Software Foundation
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
For specific licensing details and examples of how this software
can be used to build commercial integration software or to implement
integrations for your enterprise, visit http://www.OpenEai.org/licensing.
*/
package org.openeai.xml;
import org.openeai.*;
import java.io.*;
import org.jdom.Document;
import org.jdom.output.XMLOutputter;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
/**
* A convenience classed that can be used to validate an already created
* JDOM Document object.
* <P>
* @author Tod Jackson (tod@openeai.org)
* @author Steve Wheat (steve@openeai.org)
* @version 3.0 - 28 January 2003
*/
public class XmlValidator extends OpenEaiObject {
/**
* Constructor
*/
public XmlValidator() {
}
/**
* Uses the Xerces SAXParser to validate an existing JDOM Document object.
*<P>
* @return boolean true if the document is valid, false if the document is not valid
*/
public final synchronized boolean isValid(Document inDoc) {
XMLOutputter xmlOut = new XMLOutputter();
ByteArrayOutputStream bArray = new ByteArrayOutputStream();
String parserName = "org.apache.xerces.parsers.SAXParser";
try {
xmlOut.output(inDoc, bArray);
}
catch (IOException e) {
logger.fatal(e.getMessage(), e);
}
byte[] b = bArray.toByteArray();
try {
ParseErrorHandler errHandler = new ParseErrorHandler();
errHandler.setExitOnError(false);
XMLReader parser = (XMLReader)Class.forName(parserName).newInstance();
parser.setFeature("http://xml.org/sax/features/validation",true);
parser.setErrorHandler(errHandler);
parser.parse(new InputSource(new ByteArrayInputStream(b)));
if (errHandler.hasErrors()) {
return false;
}
logger.debug("XML Document is valid!");
return true;
}
catch (Exception e) {
logger.fatal(e.getMessage(), e);
}
return false;
}
}