/*
* 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.generation;
import java.beans.PropertyDescriptor;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import javax.xml.transform.TransformerException;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.sax.SAXResult;
import org.apache.avalon.framework.parameters.Parameters;
import org.apache.cocoon.ProcessingException;
import org.apache.cocoon.components.flow.FlowHelper;
import org.apache.cocoon.components.flow.WebContinuation;
import org.apache.cocoon.components.jxdom.DocumentAdapter;
import org.apache.cocoon.environment.Context;
import org.apache.cocoon.environment.ObjectModelHelper;
import org.apache.cocoon.environment.Request;
import org.apache.cocoon.environment.Response;
import org.apache.cocoon.environment.SourceResolver;
import org.apache.cocoon.transformation.TraxTransformer;
import org.apache.cocoon.xml.XMLConsumer;
import org.apache.commons.jxpath.DynamicPropertyHandler;
import org.apache.commons.jxpath.JXPathBeanInfo;
import org.apache.commons.jxpath.JXPathIntrospector;
import org.xml.sax.SAXException;
/**
* <p>XSLT Generator: works by taking a Java Bean as an input "document"</p>
*/
public class TraxGenerator extends TraxTransformer implements Generator {
//
// VG: Caching aspect: DocumentAdapter will have to dynamically generate
// cache validity depending on what resources had been used during
// generation phase. Another option is to leave it uncacheable.
//
DocumentAdapter doc;
public void setup(SourceResolver resolver, Map objectModel,
String src, Parameters parameters)
throws ProcessingException, SAXException, IOException {
super.setup(resolver, objectModel, src, parameters);
Object bean = FlowHelper.getContextObject(objectModel);
WebContinuation kont = FlowHelper.getWebContinuation(objectModel);
Map map = new HashMap();
Request request = ObjectModelHelper.getRequest(objectModel);
Response response = ObjectModelHelper.getResponse(objectModel);
Context context = ObjectModelHelper.getContext(objectModel);
if (bean != null) {
fillContext(bean, map);
map.put("flowContext", bean);
map.put("continuation", kont);
}
map.put("request", request);
map.put("response", response);
map.put("context", context);
Object session = request.getSession(false);
if (session != null) {
map.put("session", session);
}
doc = new DocumentAdapter(map, "document");
}
private void fillContext(Object contextObject, Map map) {
if (contextObject == null) return;
// Hack: I use jxpath to populate the context object's properties
// in the jexl context
final JXPathBeanInfo bi =
JXPathIntrospector.getBeanInfo(contextObject.getClass());
if (bi.isDynamic()) {
Class cl = bi.getDynamicPropertyHandlerClass();
try {
DynamicPropertyHandler h = (DynamicPropertyHandler) cl.newInstance();
String[] result = h.getPropertyNames(contextObject);
for (int i = 0; i < result.length; i++) {
try {
map.put(result[i],
(h.getProperty(contextObject, result[i])));
} catch (Exception exc) {
exc.printStackTrace();
}
}
} catch (Exception ignored) {
ignored.printStackTrace();
}
} else {
PropertyDescriptor[] props = bi.getPropertyDescriptors();
for (int i = 0; i < props.length; i++) {
try {
Method read = props[i].getReadMethod();
if (read != null) {
map.put(props[i].getName(),
(read.invoke(contextObject, null)));
}
} catch (Exception ignored) {
ignored.printStackTrace();
}
}
}
}
public void generate()
throws IOException, SAXException, ProcessingException {
javax.xml.transform.Transformer transformer =
transformerHandler.getTransformer();
DOMSource src = new DOMSource(doc);
SAXResult result = new SAXResult(xmlConsumer);
try {
transformer.transform(src, result);
} catch (TransformerException exc) {
throw new SAXException(exc.getMessage(), exc);
}
}
public void setConsumer(XMLConsumer consumer) {
this.xmlConsumer = consumer;
}
public void recycle() {
super.recycle();
this.doc = null;
}
}