/*
* 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.acting;
import java.util.HashMap;
import java.util.Map;
import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.parameters.Parameters;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.avalon.excalibur.component.ComponentHandler;
import org.apache.cocoon.components.sax.XMLByteStreamCompiler;
import org.apache.cocoon.components.sax.XMLByteStreamFragment;
import org.apache.cocoon.environment.ObjectModelHelper;
import org.apache.cocoon.environment.Redirector;
import org.apache.cocoon.environment.Request;
import org.apache.cocoon.environment.SourceResolver;
import org.apache.cocoon.generation.ServerPagesGenerator;
import org.apache.cocoon.xml.AbstractXMLConsumer;
/**
* Allows actions to be written in XSP. This allows to use XSP to produce
* XML fragments that are later reused in generators.<br/>
*
* This action works in concert with the "action" logicheet, that offers
* actions-related services such as redirect or result map access, and the
* "capture" logicsheet that allows to capture parts of XSP-generated XML
* either as an <code>XMLizable</code> containing serialized SAX events,
* or as a DOM <code>Node</code>.<br/>
*
* As for generators, the XSP file name is set using the "src" attribute.<br/>
*
* This action accepts a single parameter, "output-attribute", which names
* the request attribute where the XSP-generated document will be stored
* (as an <code>XMLizable</code>). If this parameter is omitted, the
* XSP result is discarded (often the case when inner fragments are captured
* with the "capture" logicsheet").<br/>
*
* When "output-attribute" is set, the action status defaults to "success",
* meaning child sitemap statements are executed. This allows to use an
* existing XSP without modification with this action.<br/>
*
* When "output-attribute" isn't set, the action status defaults to "failure".
* The XSP must then use the "action" logicsheet to set its status.<br/>
*
* Example :
* <pre>
* <action type="serverpages" src="myAction.xsp">
* <map:param name="output-attribute" value="xsp-action-result"/>
* ...
* </action>
* </pre>
*
* @author <a href="mailto:sylvain@apache.org">Sylvain Wallez</a>
* @version CVS $Id: ServerPagesAction.java 125255 2005-01-15 07:56:05Z antonio $
*/
public class ServerPagesAction
extends ConfigurableComposerAction
implements Disposable, ThreadSafe {
public static final String REDIRECTOR_OBJECT = "xsp-action:redirector";
public static final String ACTION_RESULT_OBJECT = "xsp-action:result";
public static final String ACTION_SUCCESS_OBJECT = "xsp-action:success";
ComponentHandler generatorHandler;
public void configure(Configuration conf)
throws ConfigurationException {
try {
this.generatorHandler = ComponentHandler.getComponentHandler(
ServerPagesGenerator.class,
conf,
this.manager,
null, // Context
null, // RoleManager
null, // LogkitLoggerManager
null, // InstrumentManager
"N/A" // instrumentableName
);
this.generatorHandler.enableLogging(getLogger());
this.generatorHandler.initialize();
} catch(Exception e) {
throw new ConfigurationException("Cannot set up component handler", e);
}
}
/* (non-Javadoc)
* @see org.apache.avalon.framework.activity.Disposable#dispose()
*/
public void dispose() {
if (this.generatorHandler != null) {
this.generatorHandler.dispose();
this.generatorHandler = null;
}
}
public Map act(Redirector redirector, SourceResolver resolver, Map objectModel,
String source, Parameters parameters)
throws Exception {
if (this.getLogger().isDebugEnabled()) {
getLogger().debug("serverpage source: " + source);
}
String outputKey = parameters.getParameter("output-attribute", null);
Map resultMap = new HashMap();
Object success = null;
// Get a ServerPagesGenerator
ServerPagesGenerator generator = (ServerPagesGenerator)this.generatorHandler.get();
// Generator output, if output-attribute was given
XMLByteStreamCompiler compiler = null;
try {
generator.enableLogging(getLogger());
generator.compose(this.manager);
generator.setup(resolver, objectModel, source, parameters);
// Setup generator output
if (outputKey == null) {
// discard output to a "black hole"
generator.setConsumer(new AbstractXMLConsumer() { } ); // Make the abstract class instanciable
} else {
// store output in a byte stream
compiler = new XMLByteStreamCompiler();
generator.setConsumer(compiler);
}
// Augment the object model for the "action" logicsheet
objectModel.put(REDIRECTOR_OBJECT, redirector);
objectModel.put(ACTION_RESULT_OBJECT, resultMap);
// Let the XSP do it's stuff
generator.generate();
success = objectModel.get(ACTION_SUCCESS_OBJECT);
} finally {
// Release generator
generatorHandler.put(generator);
// Clean up object model
objectModel.remove(REDIRECTOR_OBJECT);
objectModel.remove(ACTION_RESULT_OBJECT);
objectModel.remove(ACTION_SUCCESS_OBJECT);
}
if (outputKey != null) {
// Success defaults to true when the whole output is captured
if (success == null) {
success = Boolean.TRUE;
}
if (success == Boolean.TRUE) {
// Store the XSP output in the request
Request req = ObjectModelHelper.getRequest(objectModel);
req.setAttribute(outputKey, new XMLByteStreamFragment(compiler.getSAXFragment()));
}
}
return (success == Boolean.TRUE) ? resultMap : null;
}
}