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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.util;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
/**
* ContentHandlerFactory which constructs ContentHandlers that build DOM Documents.
*/
public class DOMBuilderContentHandlerFactory implements ContentHandlerFactory {
private static SAXTransformerFactory tFactory
= (SAXTransformerFactory)SAXTransformerFactory.newInstance();
private String namespaceURI;
private DOMImplementation domImplementation;
/**
* Main Constructor
* @param namespaceURI the main namespace URI for the DOM to be parsed
* @param domImplementation the DOMImplementation to use for build the DOM
*/
public DOMBuilderContentHandlerFactory(String namespaceURI,
DOMImplementation domImplementation) {
this.namespaceURI = namespaceURI;
this.domImplementation = domImplementation;
}
/** {@inheritDoc} */
public String[] getSupportedNamespaces() {
return new String[] {namespaceURI};
}
/** {@inheritDoc} */
public ContentHandler createContentHandler() throws SAXException {
return new Handler();
}
private class Handler extends DelegatingContentHandler
implements ContentHandlerFactory.ObjectSource {
private Document doc;
private ObjectBuiltListener obListener;
public Handler() throws SAXException {
super();
}
public Document getDocument() {
return this.doc;
}
/**
* {@inheritDoc}
*/
public Object getObject() {
return getDocument();
}
/**
* {@inheritDoc}
*/
public void setObjectBuiltListener(ObjectBuiltListener listener) {
this.obListener = listener;
}
/**
* {@inheritDoc}
*/
public void startDocument() throws SAXException {
//Suppress startDocument() call if doc has not been set, yet. It will be done later.
if (doc != null) {
super.startDocument();
}
}
/**
* {@inheritDoc}
*/
public void startElement(String uri, String localName, String qName, Attributes atts)
throws SAXException {
if (doc == null) {
TransformerHandler handler;
try {
handler = tFactory.newTransformerHandler();
} catch (TransformerConfigurationException e) {
throw new SAXException("Error creating a new TransformerHandler", e);
}
doc = domImplementation.createDocument(namespaceURI, qName, null);
//It's easier to work with an empty document, so remove the root element
doc.removeChild(doc.getDocumentElement());
handler.setResult(new DOMResult(doc));
setDelegateContentHandler(handler);
setDelegateLexicalHandler(handler);
setDelegateDTDHandler(handler);
handler.startDocument();
}
super.startElement(uri, localName, qName, atts);
}
/**
* {@inheritDoc}
*/
public void endDocument() throws SAXException {
super.endDocument();
if (obListener != null) {
obListener.notifyObjectBuilt(getObject());
}
}
}
}
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