| /* |
| * 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; |
| } |
| |
| } |
