/*
* Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
*
* This software is open source.
* See the bottom of this file for the licence.
*/
package org.dom4j.io;
import java.io.
IOException;
import org.dom4j.
Document;
import org.xml.sax.
ContentHandler;
import org.xml.sax.
ErrorHandler;
import org.xml.sax.
SAXException;
import org.xml.sax.
XMLReader;
import org.xml.sax.helpers.
DefaultHandler;
/**
* <p>
* <code>SAXValidator</code> validates an XML document by writing the document
* to a text buffer and parsing it with a validating SAX parser. This could be
* implemented much more efficiently by validating against the dom4j object
* model directly but at least allows the reuse of existing SAX based validating
* parsers.
* </p>
*
* @author <a href="mailto:james.strachan@metastuff.com">James Strachan </a>
* @version $Revision: 1.10 $
*/
public class
SAXValidator {
/** <code>XMLReader</code> used to parse the SAX events */
private
XMLReader xmlReader;
/** ErrorHandler class to use */
private
ErrorHandler errorHandler;
public
SAXValidator() {
}
public
SAXValidator(
XMLReader xmlReader) {
this.
xmlReader =
xmlReader;
}
/**
* Validates the given <code>Document</code> by writing it to a validating
* SAX Parser.
*
* @param document
* is the Document to validate
*
* @throws SAXException
* if a validation error occurs
* @throws RuntimeException
* DOCUMENT ME!
*/
public void
validate(
Document document) throws
SAXException {
if (
document != null) {
XMLReader reader =
getXMLReader();
if (
errorHandler != null) {
reader.
setErrorHandler(
errorHandler);
}
try {
reader.
parse(new
DocumentInputSource(
document));
} catch (
IOException e) {
throw new
RuntimeException("Caught and exception that should "
+ "never happen: " +
e);
}
}
}
// Properties
// -------------------------------------------------------------------------
/**
* DOCUMENT ME!
*
* @return the <code>XMLReader</code> used to parse SAX events
*
* @throws SAXException
* DOCUMENT ME!
*/
public
XMLReader getXMLReader() throws
SAXException {
if (
xmlReader == null) {
xmlReader =
createXMLReader();
configureReader();
}
return
xmlReader;
}
/**
* Sets the <code>XMLReader</code> used to parse SAX events
*
* @param reader
* is the <code>XMLReader</code> to parse SAX events
*
* @throws SAXException
* DOCUMENT ME!
*/
public void
setXMLReader(
XMLReader reader) throws
SAXException {
this.
xmlReader =
reader;
configureReader();
}
/**
* DOCUMENT ME!
*
* @return the <code>ErrorHandler</code> used by SAX
*/
public
ErrorHandler getErrorHandler() {
return
errorHandler;
}
/**
* Sets the <code>ErrorHandler</code> used by the SAX
* <code>XMLReader</code>.
*
* @param errorHandler
* is the <code>ErrorHandler</code> used by SAX
*/
public void
setErrorHandler(
ErrorHandler errorHandler) {
this.
errorHandler =
errorHandler;
}
// Implementation methods
// -------------------------------------------------------------------------
/**
* Factory Method to allow alternate methods of creating and configuring
* XMLReader objects
*
* @return DOCUMENT ME!
*
* @throws SAXException
* DOCUMENT ME!
*/
protected
XMLReader createXMLReader() throws
SAXException {
return
SAXHelper.
createXMLReader(true);
}
/**
* Configures the XMLReader before use
*
* @throws SAXException
* DOCUMENT ME!
*/
protected void
configureReader() throws
SAXException {
ContentHandler handler =
xmlReader.
getContentHandler();
if (
handler == null) {
xmlReader.
setContentHandler(new
DefaultHandler());
}
// configure validation support
xmlReader.
setFeature("http://xml.org/sax/features/validation", true);
// configure namespace support
xmlReader.
setFeature("http://xml.org/sax/features/namespaces", true);
xmlReader.
setFeature("http://xml.org/sax/features/namespace-prefixes",
false);
}
}
/*
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain copyright statements and
* notices. Redistributions must also contain a copy of this document.
*
* 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 name "DOM4J" must not be used to endorse or promote products derived
* from this Software without prior written permission of MetaStuff, Ltd. For
* written permission, please contact dom4j-info@metastuff.com.
*
* 4. Products derived from this Software may not be called "DOM4J" nor may
* "DOM4J" appear in their names without prior written permission of MetaStuff,
* Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
*
* 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
*
* THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``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 METASTUFF, LTD. 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.
*
* Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
*/