| /* |
| * Copyright 1999-2004 The Apache Software Foundation. |
| * |
| * Licensed 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.sitemap; |
| |
| import org.apache.avalon.framework.parameters.Parameters; |
| import org.apache.avalon.framework.service.ServiceException; |
| import org.apache.avalon.framework.service.ServiceManager; |
| import org.apache.avalon.framework.service.Serviceable; |
| import org.apache.cocoon.ProcessingException; |
| import org.apache.cocoon.caching.CacheableProcessingComponent; |
| import org.apache.cocoon.components.source.SourceUtil; |
| import org.apache.cocoon.environment.SourceResolver; |
| import org.apache.cocoon.generation.Generator; |
| import org.apache.cocoon.xml.ContentHandlerWrapper; |
| import org.apache.cocoon.xml.XMLConsumer; |
| import org.apache.excalibur.source.Source; |
| import org.apache.excalibur.source.SourceException; |
| import org.apache.excalibur.source.SourceValidity; |
| import org.apache.excalibur.source.impl.validity.AggregatedValidity; |
| import org.xml.sax.Attributes; |
| import org.xml.sax.SAXException; |
| import org.xml.sax.helpers.AttributesImpl; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Map; |
| |
| /** |
| * This generator implements the sitemap content aggregation. |
| * It combines several parts into one big XML document which is streamed |
| * into the pipeline. |
| * |
| * @author <a href="mailto:giacomo@apache.org">Giacomo Pati</a> |
| * @author <a href="mailto:cziegeler@apache.org">Carsten Ziegeler</a> |
| * @version CVS $Id: ContentAggregator.java,v 1.6 2004/03/05 13:02:58 bdelacretaz Exp $ |
| */ |
| public class ContentAggregator |
| extends ContentHandlerWrapper |
| implements Generator, CacheableProcessingComponent, Serviceable { |
| |
| /** the root element of the aggregated content */ |
| protected Element rootElement; |
| |
| /** the parts */ |
| protected ArrayList parts = new ArrayList(); |
| |
| /** Empty Attributes */ |
| private AttributesImpl emptyAttrs = new AttributesImpl(); |
| |
| /** Indicates the position in the stack of the root element of the aggregated content */ |
| private int rootElementIndex; |
| |
| /** The element used for the current part */ |
| protected Element currentElement; |
| |
| /** The SourceResolver */ |
| protected SourceResolver resolver; |
| |
| /** The component manager */ |
| protected ServiceManager manager; |
| |
| /** This object holds the part parts :) */ |
| protected final class Part { |
| public String uri; |
| public Element element; |
| public Source source; |
| boolean stripRootElement; |
| |
| public Part(String uri, Element element, String stripRoot) { |
| this.uri = uri; |
| this.element = element; |
| this.stripRootElement = (stripRoot.equals("yes") || stripRoot.equals("true")); |
| } |
| } |
| |
| /** This object holds an element definition */ |
| protected final class Element { |
| public String namespace; |
| public String prefix; |
| public String name; |
| |
| public Element(String name, String namespace, String prefix) { |
| this.namespace = namespace; |
| this.prefix = prefix; |
| this.name = name; |
| } |
| } |
| |
| /** |
| * generates the content |
| */ |
| public void generate() |
| throws IOException, SAXException, ProcessingException { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Generating aggregated content"); |
| } |
| this.contentHandler.startDocument(); |
| this.startElem(this.rootElement); |
| try { |
| for (int i = 0; i < this.parts.size(); i++) { |
| final Part part = (Part)this.parts.get(i); |
| this.rootElementIndex = (part.stripRootElement ? -1 : 0); |
| if (part.element != null) { |
| this.currentElement = part.element; |
| this.startElem(part.element); |
| } else { |
| this.currentElement = this.rootElement; |
| } |
| |
| try { |
| SourceUtil.parse(this.manager, part.source, this); |
| } finally { |
| if (part.element != null) { |
| this.endElem(part.element); |
| } |
| } |
| } |
| } finally { |
| this.endElem(this.rootElement); |
| this.contentHandler.endDocument(); |
| } |
| getLogger().debug("Finished aggregating content"); |
| } |
| |
| /** |
| * Generate the unique key. |
| * This key must be unique inside the space of this component. |
| * |
| * @return The generated key hashes the src |
| */ |
| public java.io.Serializable getKey() { |
| try { |
| StringBuffer buffer = new StringBuffer(); |
| buffer.append("CA(") |
| .append(this.rootElement.prefix).append(':') |
| .append(this.rootElement.name).append('<') |
| .append(this.rootElement.namespace).append(">)"); |
| Source current; |
| for (int i = 0; i < this.parts.size(); i++) { |
| final Part part = (Part)this.parts.get(i); |
| current = part.source; |
| if (part.element == null) { |
| buffer.append("P=") |
| .append(part.stripRootElement).append(':') |
| .append(current.getURI()).append(';'); |
| } else { |
| buffer.append("P=") |
| .append(part.element.prefix).append(':') |
| .append(part.element.name) |
| .append('<').append(part.element.namespace).append(">:") |
| .append(part.stripRootElement).append(':') |
| .append(current.getURI()).append(';'); |
| } |
| } |
| return buffer.toString(); |
| } catch (Exception e) { |
| getLogger().error("Could not generateKey", e); |
| return null; |
| } |
| } |
| |
| /** |
| * Generate the validity object. |
| * |
| * @return The generated validity object or <code>null</code> if the |
| * component is currently not cacheable. |
| */ |
| public SourceValidity getValidity() { |
| try { |
| AggregatedValidity v = new AggregatedValidity(); |
| Source current; |
| for (int i = 0; i < this.parts.size(); i++) { |
| current = ((Part)this.parts.get(i)).source; |
| SourceValidity sv = current.getValidity(); |
| if (sv == null) { |
| return null; |
| } else { |
| v.add(sv); |
| } |
| } |
| return v; |
| } catch (Exception e) { |
| getLogger().error("Could not getValidity", e); |
| return null; |
| } |
| } |
| |
| /** |
| * Set the root element. Please make sure that the parameters are not null! |
| */ |
| public void setRootElement(String element, String namespace, String prefix) { |
| this.rootElement = new Element(element, |
| namespace, |
| prefix); |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Root element='" + element + |
| "' ns='" + namespace + "' prefix='" + prefix + "'"); |
| } |
| } |
| |
| /** |
| * Add a part. Please make sure that the parameters are not null! |
| */ |
| public void addPart(String uri, |
| String element, |
| String namespace, |
| String stripRootElement, |
| String prefix) { |
| Element elem = null; |
| if (!element.equals("")) { |
| if (namespace.equals("")) { |
| elem = new Element(element, |
| this.rootElement.namespace, |
| this.rootElement.prefix); |
| } else { |
| elem = new Element(element, |
| namespace, |
| prefix); |
| } |
| } |
| this.parts.add(new Part(uri, |
| elem, |
| stripRootElement)); |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Part uri='" + uri + |
| "' element='" + element + "' ns='" + namespace + |
| "' stripRootElement='" + stripRootElement + "' prefix='" + prefix + "'"); |
| } |
| } |
| |
| /** |
| * Set the <code>XMLConsumer</code> that will receive XML data. |
| * <br> |
| * This method will simply call <code>setContentHandler(consumer)</code> |
| * and <code>setLexicalHandler(consumer)</code>. |
| */ |
| public void setConsumer(XMLConsumer consumer) { |
| this.setContentHandler(consumer); |
| this.setLexicalHandler(consumer); |
| } |
| |
| /** |
| * Recycle the producer by removing references |
| */ |
| public void recycle() { |
| super.recycle(); |
| this.rootElement = null; |
| for(int i=0; i<this.parts.size();i++) { |
| final Part current = (Part)this.parts.get(i); |
| if (current.source != null) { |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("Releasing " + String.valueOf(current.source)); |
| } |
| this.resolver.release(current.source); |
| } |
| } |
| this.parts.clear(); |
| this.currentElement = null; |
| this.resolver = null; |
| } |
| |
| /** |
| * Set the <code>SourceResolver</code>, object model <code>Map</code>, |
| * the source and sitemap <code>Parameters</code> used to process the request. |
| */ |
| public void setup(SourceResolver resolver, Map objectModel, String src, Parameters par) |
| throws ProcessingException, SAXException, IOException { |
| this.resolver = resolver; |
| // get the Source for each part |
| try { |
| for(int i=0; i<this.parts.size();i++) { |
| final Part current = (Part)this.parts.get(i); |
| current.source = resolver.resolveURI(current.uri); |
| } |
| } catch (SourceException se) { |
| throw SourceUtil.handle("Unable to resolve source.", se); |
| } |
| } |
| |
| /** |
| * Private method generating startElement event for the aggregated parts |
| * and the root element |
| */ |
| private void startElem(Element element) |
| throws SAXException { |
| final String qname = (element.prefix.equals("")) ? element.name : element.prefix + ':' + element.name; |
| if (!element.namespace.equals("")) { |
| this.contentHandler.startPrefixMapping(element.prefix, element.namespace); |
| } |
| this.contentHandler.startElement(element.namespace, element.name, qname, this.emptyAttrs); |
| } |
| |
| /** |
| * Private method generating endElement event for the aggregated parts |
| * and the root element |
| */ |
| private void endElem(Element element) throws SAXException { |
| final String qname = (element.prefix.equals("")) ? element.name : element.prefix + ':' + element.name; |
| this.contentHandler.endElement(element.namespace, element.name, qname); |
| if (!element.namespace.equals("")) { |
| this.contentHandler.endPrefixMapping(element.prefix); |
| } |
| } |
| |
| /** |
| * Ignore start and end document events |
| */ |
| public void startDocument() throws SAXException { |
| } |
| |
| /** |
| * Ignore start and end document events |
| */ |
| public void endDocument() throws SAXException { |
| } |
| |
| /** |
| * Override startElement() event to add namespace and prefix |
| */ |
| public void startElement(String namespaceURI, String localName, String raw, Attributes atts) |
| throws SAXException { |
| this.rootElementIndex++; |
| if (this.rootElementIndex == 0) { |
| getLogger().debug("Skipping root element start event."); |
| return; |
| } |
| if (namespaceURI == null || namespaceURI.equals("")) { |
| final String qname = this.currentElement.prefix.equals("") ? localName : this.currentElement.prefix + ':' + localName; |
| this.contentHandler.startElement(this.currentElement.namespace, localName, qname, atts); |
| } else { |
| this.contentHandler.startElement(namespaceURI, localName, raw, atts); |
| } |
| } |
| |
| /** |
| * Override startElement() event to add namespace and prefix |
| */ |
| public void endElement(String namespaceURI, String localName, String raw) throws SAXException { |
| this.rootElementIndex--; |
| if (this.rootElementIndex == -1) { |
| getLogger().debug("Skipping root element end event."); |
| return; |
| } |
| if (namespaceURI == null || namespaceURI.equals("")) { |
| final String qname = this.currentElement.prefix.equals("") ? localName : this.currentElement.prefix + ':' + localName; |
| this.contentHandler.endElement(this.currentElement.namespace, localName, qname); |
| } else { |
| this.contentHandler.endElement(namespaceURI, localName, raw); |
| } |
| } |
| |
| /* (non-Javadoc) |
| * @see org.apache.avalon.framework.service.Serviceable#service(org.apache.avalon.framework.service.ServiceManager) |
| */ |
| public void service(ServiceManager manager) throws ServiceException { |
| this.manager = manager; |
| } |
| } |
