/*
* 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.
*/
package org.apache.cocoon.portal.transformation;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Serializable;
import java.util.Map;
import org.apache.avalon.framework.parameters.Parameters;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.cocoon.ProcessingException;
import org.apache.cocoon.caching.CacheableProcessingComponent;
import org.apache.cocoon.components.sax.XMLDeserializer;
import org.apache.cocoon.components.sax.XMLSerializer;
import org.apache.cocoon.environment.SourceResolver;
import org.apache.cocoon.transformation.AbstractSAXTransformer;
import org.apache.cocoon.xml.IncludeXMLConsumer;
import org.apache.cocoon.xml.XMLConsumer;
import org.apache.excalibur.source.SourceValidity;
import org.apache.excalibur.source.impl.validity.NOPValidity;
import org.apache.excalibur.xmlizer.XMLizer;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* This transformer records the content of all description elements
* and tries to interpret them as valid XML.
* It's actually a quick hack...
*
* @author <a href="mailto:cziegeler@apache.org">Carsten Ziegeler</a>
* @version CVS $Id$
*/
public final class RSSTransformer
extends AbstractSAXTransformer
implements CacheableProcessingComponent {
/** The xmlizer for converting html to xml */
protected XMLizer xmlizer;
/** The xml deserializer */
protected XMLDeserializer deserializer;
/** The filter */
protected XMLConsumer filter;
/**
* receive notification of start element event.
**/
public void startElement(String uri, String name, String raw, Attributes attributes)
throws SAXException {
super.startElement(uri,name,raw,attributes);
if ("description".equals(name)) {
this.startTextRecording();
}
}
/**
* receive notification of end element event.
*/
public void endElement(String uri,String name,String raw)
throws SAXException {
if ("description".equals(name)) {
final String text = this.endTextRecording();
final String html = "<html><body>"+text+"</body></html>";
Object parsed = null;
XMLSerializer serializer = null;
try {
serializer = (XMLSerializer)this.manager.lookup(XMLSerializer.ROLE);
InputStream inputStream = new ByteArrayInputStream(html.getBytes());
this.xmlizer.toSAX(inputStream,
"text/html",
null,
serializer);
// if no exception occurs, everything is fine!
parsed = serializer.getSAXFragment();
} catch (Exception ignore) {
// just ignore all exceptions
} finally {
this.manager.release( serializer );
}
if ( parsed != null ) {
this.deserializer.setConsumer( this.filter );
this.deserializer.deserialize( parsed );
} else {
this.sendTextEvent(text);
}
}
super.endElement(uri,name,raw);
}
/* (non-Javadoc)
* @see org.apache.avalon.excalibur.pool.Recyclable#recycle()
*/
public void recycle() {
this.manager.release( this.xmlizer );
this.manager.release( this.deserializer );
this.xmlizer = null;
this.deserializer = null;
this.filter = null;
super.recycle();
}
/* (non-Javadoc)
* @see org.apache.cocoon.sitemap.SitemapModelComponent#setup(org.apache.cocoon.environment.SourceResolver, java.util.Map, java.lang.String, org.apache.avalon.framework.parameters.Parameters)
*/
public void setup(SourceResolver resolver,
Map objectModel,
String src,
Parameters par)
throws ProcessingException, SAXException, IOException {
super.setup(resolver, objectModel, src, par);
try {
this.xmlizer = (XMLizer)this.manager.lookup(XMLizer.ROLE);
this.deserializer = (XMLDeserializer)this.manager.lookup(XMLDeserializer.ROLE);
} catch (ServiceException ce) {
throw new ProcessingException("Unable to lookup component.", ce);
}
}
static class HTMLFilter extends IncludeXMLConsumer {
int bodyCount = 0;
public HTMLFilter(XMLConsumer consumer) {
super(consumer);
}
public void startElement(String uri, String local, String qName, Attributes attr) throws SAXException {
if (bodyCount > 0 ) {
super.startElement(uri, local, qName, attr);
}
if ("body".equalsIgnoreCase(local)) {
bodyCount++;
}
}
public void endElement(String uri, String local, String qName) throws SAXException {
if ("body".equalsIgnoreCase(local)) {
bodyCount--;
}
if (bodyCount > 0 ) {
super.endElement(uri, local, qName );
}
}
}
/* (non-Javadoc)
* @see org.apache.cocoon.transformation.AbstractSAXTransformer#setupTransforming()
*/
public void setupTransforming()
throws IOException, ProcessingException, SAXException {
super.setupTransforming();
this.filter = new HTMLFilter( this.xmlConsumer );
}
/* (non-Javadoc)
* @see org.apache.cocoon.caching.CacheableProcessingComponent#getKey()
*/
public Serializable getKey() {
return "1";
}
/* (non-Javadoc)
* @see org.apache.cocoon.caching.CacheableProcessingComponent#getValidity()
*/
public SourceValidity getValidity() {
return NOPValidity.SHARED_INSTANCE;
}
}