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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.accessibility;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Templates;
import javax.xml.transform.Transformer;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import org.apache.fop.apps.FOPException;
import org.apache.fop.apps.FOUserAgent;
/**
* An extension of TransformerNode used to run 2nd transform after completion of first
*/
class TransformerNodeEndProcessing extends TransformerNode {
private final ByteArrayOutputStream enrichedFOBuffer = new ByteArrayOutputStream();
private DefaultHandler delegateHandler = null;
private final FOUserAgent userAgent;
/**
* Do a transform, but perform special processing at the end for the access
* stuff.
*
* @param xsltTemplates Transform to do.
* @param fopHandler Used in the end processing
* @param userAgent the userAgent
* @throws FOPException
* if transform fails
*/
public TransformerNodeEndProcessing(Templates xsltTemplates, DefaultHandler fopHandler,
FOUserAgent userAgent) throws FOPException {
super(xsltTemplates);
delegateHandler = fopHandler;
this.userAgent = userAgent;
Result res1 = new StreamResult(enrichedFOBuffer);
super.initResult(res1);
}
/**
* Do a transform, but perform special processing at the end for the access
* stuff.
*
* @param xsltFile Transform to do.
* @param fopHandler Used in the end processing
* @param userAgent the userAgent
* @throws FOPException if transform fails
*/
public TransformerNodeEndProcessing(Source xsltFile, DefaultHandler fopHandler,
FOUserAgent userAgent) throws FOPException {
super(xsltFile);
delegateHandler = fopHandler;
this.userAgent = userAgent;
Result res1 = new StreamResult(enrichedFOBuffer);
super.initResult(res1);
}
/** {@inheritDoc} */
public void endDocument() throws SAXException {
super.endDocument();
// do the second transform to struct
try {
//TODO this must be optimized, no buffering (ex. SAX-based tee-proxy)
byte[] enrichedFO = enrichedFOBuffer.toByteArray();
Transformer transformer = AccessibilityUtil.getReduceFOTreeTemplates().newTransformer();
Source src = new StreamSource(new ByteArrayInputStream(enrichedFO));
ByteArrayOutputStream out = new ByteArrayOutputStream();
Result res = new StreamResult(out);
transformer.transform(src, res);
userAgent.setReducedFOTree(out.toByteArray());
SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
saxParserFactory.setNamespaceAware(true);
saxParserFactory.setValidating(false);
SAXParser saxParser = saxParserFactory.newSAXParser();
InputStream in = new ByteArrayInputStream(enrichedFO);
saxParser.parse(in, delegateHandler);
} catch (Exception e) {
// TODO Auto-generated catch block
throw new SAXException(e);
}
}
}
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