/*****************************************************************************
* Copyright (C) The Apache Software Foundation. All rights reserved. *
* ------------------------------------------------------------------------- *
* This software is published under the terms of the Apache Software License *
* version 1.1, a copy of which has been included with this distribution in *
* the LICENSE file. *
*****************************************************************************/
package org.apache.cocoon.xml;
import org.apache.cocoon.xml.dom.DOMStreamer;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
/**
* Abstract implementation of {@link XMLFragment} for objects that are more easily represented
* as a DOM.
* <br/>
* The toSAX() method is implemented by streaming (using a <code>DOMStreamer</code>)
* the results of <code>toDOM()</code> that must be implemented by concrete subclasses.
*
* @author <a href="mailto:sylvain.wallez@anyware-tech.com">Sylvain Wallez</a>
* @version CVS $Revision: 1.1 $ $Date: 2002/01/03 12:31:22 $
*/
public abstract class AbstractDOMFragment implements XMLFragment {
/**
* Generates SAX events representing the object's state by serializing the
* result of <code>toDOM()</code>.
*/
public void toSAX(ContentHandler handler) throws SAXException {
// The ComponentManager is unknown here : use JAXP to create a document
DocumentBuilder builder;
try {
builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
}
catch (ParserConfigurationException pce) {
throw new SAXException("Couldn't get a DocumentBuilder", pce);
}
Document doc = builder.newDocument();
// Create a DocumentFragment that will hold the results of toDOM()
// (which can create several top-level elements)
Node df = doc.createDocumentFragment();
// Build the DOM representation of this object
try {
toDOM(df);
}
catch(Exception e) {
throw new SAXException("Exception while converting object to DOM", e);
}
// Stream the document fragment
DOMStreamer streamer = new DOMStreamer(handler);
streamer.stream(df);
}
}