/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-2014 The eXist Project
* http://exist-db.org
*
* This program 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
* of the License, or (at your option) any later version.
*
* This program 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.exist.collections.triggers;
import java.net.URISyntaxException;
import java.util.List;
import java.util.Map;
import javax.xml.transform.Templates;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXResult;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamSource;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.exist.collections.Collection;
import org.exist.dom.persistent.BinaryDocument;
import org.exist.dom.persistent.DocumentImpl;
import org.exist.security.PermissionDeniedException;
import org.exist.storage.DBBroker;
import org.exist.storage.txn.Txn;
import org.exist.xmldb.XmldbURI;
import org.exist.xquery.Constants;
import org.xml.sax.SAXException;
/**
* STXTransformerTrigger applies an STX stylesheet to the input SAX stream,
* using <a href="http://joost.sourceforge.net">Joost</a>. The stylesheet location
* is identified by parameter "src". If the src parameter is just a path, the stylesheet
* will be loaded from the database, otherwise, it is interpreted as an URI.
*
* @author wolf
*/
public class STXTransformerTrigger extends SAXTrigger implements DocumentTrigger {
protected Logger LOG = LogManager.getLogger(getClass());
private SAXTransformerFactory factory = (SAXTransformerFactory)TransformerFactory.newInstance("net.sf.joost.trax.TransformerFactoryImpl", getClass().getClassLoader());
private TransformerHandler handler = null;
private static STXTemplatesCache templatesCache = new STXTemplatesCache();
@Override
public void configure(DBBroker broker, Collection parent, Map<String, List<?>> parameters) throws TriggerException {
super.configure(broker, parent, parameters);
final String stylesheet = (String)parameters.get("src").get(0);
if(stylesheet == null) {
throw new TriggerException("STXTransformerTrigger requires an attribute 'src'");
}
/*
String origProperty = System.getProperty("javax.xml.transform.TransformerFactory");
System.setProperty("javax.xml.transform.TransformerFactory", "net.sf.joost.trax.TransformerFactoryImpl");
factory = (SAXTransformerFactory)TransformerFactory.newInstance();
// reset property to previous setting
if(origProperty != null) {
System.setProperty("javax.xml.transform.TransformerFactory", origProperty);
}
*/
/*ServiceLoader<TransformerFactory> loader = ServiceLoader.load(TransformerFactory.class);
for(TransformerFactory transformerFactory : loader) {
if(transformerFactory.getClass().getName().equals("net.sf.joost.trax.TransformerFactoryImpl")) {
factory = transformerFactory.ne
}
}*/
XmldbURI stylesheetUri=null;
try {
stylesheetUri = XmldbURI.xmldbUriFor(stylesheet);
} catch(final URISyntaxException e) {
}
//TODO: allow full XmldbURIs to be used as well.
if(stylesheetUri==null || stylesheet.indexOf(':') == Constants.STRING_NOT_FOUND) {
stylesheetUri = parent.getURI().resolveCollectionPath(stylesheetUri);
DocumentImpl doc;
try {
doc = (DocumentImpl)broker.getXMLResource(stylesheetUri);
if(doc == null) {
throw new TriggerException("stylesheet " + stylesheetUri + " not found in database");
}
if(doc instanceof BinaryDocument) {
throw new TriggerException("stylesheet " + stylesheetUri + " must be stored as an xml document and not a binary document!");
}
handler = factory.newTransformerHandler(templatesCache.getOrUpdateTemplate(broker, doc));
} catch (final TransformerConfigurationException e) {
throw new TriggerException(e.getMessage(), e);
} catch (final PermissionDeniedException e) {
throw new TriggerException(e.getMessage(), e);
} catch (final SAXException e) {
throw new TriggerException(e.getMessage(), e);
}
} else {
try {
LOG.debug("compiling stylesheet " + stylesheet);
final Templates template = factory.newTemplates(new StreamSource(stylesheet));
handler = factory.newTransformerHandler(template);
} catch (final TransformerConfigurationException e) {
throw new TriggerException(e.getMessage(), e);
}
}
}
private void prepare() {
//XXX: refactoring required!!!
// final SAXResult result = new SAXResult();
// result.setHandler(getOutputHandler());
// result.setLexicalHandler(getLexicalOutputHandler());
// handler.setResult(result);
// setOutputHandler(handler);
// setLexicalOutputHandler(handler);
}
@Override
public void beforeCreateDocument(DBBroker broker, Txn transaction, XmldbURI uri) throws TriggerException {
prepare();
}
@Override
public void afterCreateDocument(DBBroker broker, Txn transaction, DocumentImpl document) throws TriggerException {
}
@Override
public void beforeUpdateDocument(DBBroker broker, Txn transaction, DocumentImpl document) throws TriggerException {
prepare();
}
@Override
public void afterUpdateDocument(DBBroker broker, Txn transaction, DocumentImpl document) throws TriggerException {
}
@Override
public void beforeCopyDocument(DBBroker broker, Txn transaction, DocumentImpl document, XmldbURI newUri) throws TriggerException {
prepare();
}
@Override
public void afterCopyDocument(DBBroker broker, Txn transaction, DocumentImpl document, XmldbURI newUri) throws TriggerException {
}
@Override
public void beforeMoveDocument(DBBroker broker, Txn transaction, DocumentImpl document, XmldbURI newUri) throws TriggerException {
prepare();
}
@Override
public void afterMoveDocument(DBBroker broker, Txn transaction, DocumentImpl document, XmldbURI newUri) throws TriggerException {
}
@Override
public void beforeDeleteDocument(DBBroker broker, Txn transaction, DocumentImpl document) throws TriggerException {
prepare();
}
@Override
public void afterDeleteDocument(DBBroker broker, Txn transaction, XmldbURI uri) throws TriggerException {
}
@Override
public void beforeUpdateDocumentMetadata(DBBroker broker, Txn txn, DocumentImpl document) throws TriggerException {
}
@Override
public void afterUpdateDocumentMetadata(DBBroker broker, Txn txn, DocumentImpl document) throws TriggerException {
}
}