/*
* 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.transformation;
import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.component.ComponentManager;
import org.apache.avalon.framework.component.Composable;
import org.apache.avalon.framework.parameters.Parameters;
import org.apache.avalon.excalibur.pool.Recyclable;
import org.apache.cocoon.ProcessingException;
import org.apache.cocoon.environment.SourceResolver;
import org.apache.cocoon.xml.dom.DOMBuilder;
import org.apache.cocoon.xml.dom.DOMStreamer;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;
import org.xml.sax.Locator;
import org.xml.sax.Attributes;
import java.io.IOException;
import java.util.Map;
/**
* An Abstract DOM Transformer, for use when a transformer needs a DOM-based
* view of the document.
* Subclass this interface and implement <code>transform(Document doc)</code>.
* If you need a ComponentManager there is an instance variable
* <code>manager</code> for use.
*
* @author <a href="mailto:rossb@apache.org">Ross Burton</a>
* @author <a href="mailto:brobertson@mta.ca">Bruce G. Robertson</a>
* @author <a href="mailto:vgritsenko@apache.org">Vadim Gritsenko</a>
* @version CVS $Id: AbstractDOMTransformer.java,v 1.3 2004/04/28 16:35:21 joerg Exp $
*/
public abstract class AbstractDOMTransformer extends AbstractTransformer
implements Transformer, DOMBuilder.Listener, Composable, Disposable, Recyclable {
/**
* The SAX entity resolver
*/
protected SourceResolver resolver;
/**
* The request object model
*/
protected Map objectModel;
/**
* The URI requested
*/
protected String source;
/**
* Parameters in the sitemap
*/
protected Parameters parameters;
/**
* A <code>ComponentManager</code> which is available for use.
*/
protected ComponentManager manager;
/**
* The <code>DOMBuilder</code> used to build DOM tree out of
*incoming SAX events.
*/
protected DOMBuilder builder;
public AbstractDOMTransformer() {
super();
this.builder = new DOMBuilder(this);
}
/**
* Set the component manager.
*/
public void compose(ComponentManager manager) {
this.manager = manager;
}
/**
* Set the <code>SourceResolver</code>, objectModel <code>Map</code>,
* the source and sitemap <code>Parameters</code> used to process the request.
*
* If you wish to process the parameters, override this method, call
* <code>super()</code> and then add your code.
*/
public void setup(SourceResolver resolver, Map objectModel, String src, Parameters par)
throws ProcessingException, SAXException, IOException {
this.resolver = resolver;
this.objectModel = objectModel;
this.source = src;
this.parameters = par;
}
/**
* Recycle the component.
*/
public void recycle() {
this.resolver = null;
this.source = null;
this.objectModel = null;
this.parameters = null;
this.builder.recycle();
}
/**
* dispose
*/
public void dispose() {
this.builder = null;
this.manager = null;
}
/**
* This method is called when the Document is finished.
* @param doc The DOM Document object representing this SAX stream
* @see org.apache.cocoon.xml.dom.DOMBuilder.Listener
*/
public void notify(Document doc) throws SAXException {
// Call the user's transform method
Document newdoc = transform(doc);
// Now we stream the resulting DOM tree down the pipe
DOMStreamer s = new DOMStreamer(contentHandler, lexicalHandler);
s.stream(newdoc);
}
/**
* Transform the specified DOM, returning a new DOM to stream down the pipeline.
* @param doc The DOM Document representing the SAX stream
* @return A DOM Document to stream down the pipeline
*/
protected abstract Document transform(Document doc);
//
// SAX Methods. Send incoming SAX events to the DOMBuilder.
//
public void setDocumentLocator(Locator locator) {
builder.setDocumentLocator(locator);
}
public void startDocument() throws SAXException {
builder.startDocument();
}
public void endDocument() throws SAXException {
builder.endDocument();
}
public void startPrefixMapping(String prefix, String uri) throws SAXException {
builder.startPrefixMapping(prefix, uri);
}
public void endPrefixMapping(String prefix) throws SAXException {
builder.endPrefixMapping(prefix);
}
public void startElement(String uri, String loc, String raw, Attributes a)
throws SAXException {
builder.startElement(uri, loc, raw, a);
}
public void endElement(String uri, String loc, String raw)
throws SAXException {
builder.endElement(uri, loc, raw);
}
public void characters(char c[], int start, int len)
throws SAXException {
builder.characters(c, start, len);
}
public void ignorableWhitespace(char c[], int start, int len)
throws SAXException {
builder.ignorableWhitespace(c, start, len);
}
public void processingInstruction(String target, String data)
throws SAXException {
builder.processingInstruction(target, data);
}
public void skippedEntity(String name)
throws SAXException {
builder.skippedEntity(name);
}
public void startDTD(String name, String publicId, String systemId)
throws SAXException {
builder.startDTD(name, publicId, systemId);
}
public void endDTD()
throws SAXException {
builder.endDTD();
}
public void startEntity(String name)
throws SAXException {
builder.startEntity(name);
}
public void endEntity(String name)
throws SAXException {
builder.endEntity(name);
}
public void startCDATA()
throws SAXException {
builder.startCDATA();
}
public void endCDATA()
throws SAXException {
builder.endCDATA();
}
public void comment(char ch[], int start, int len)
throws SAXException {
builder.comment(ch, start, len);
}
}