/*
* $Id: ResolverSetupServletContextListener.java 439747 2006-09-03 09:22:46Z mrdon $
*
* Copyright 2006 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.struts2.util;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.apache.struts2.dispatcher.Dispatcher;
import org.apache.struts2.dispatcher.DispatcherListener;
import com.opensymphony.xwork2.config.Configuration;
import com.opensymphony.xwork2.config.entities.PackageConfig;
/**
* A Servlet Context Listener that will loop through all Reference Resolvers available in
* the xwork Configuration and set the ServletContext on those that are ServletContextAware.
* The Servlet Context can be used by the External Reference Resolver to initialise it's state. i.e. the
* Spring framework uses a ContextServletListener to initialise it's IoC container, storing it's
* container context (ApplicationContext in Spring terms) in the Servlet context, the External
* Reference Resolver can get a reference to the container context from the servlet context.
*/
public class ResolverSetupServletContextListener implements ServletContextListener {
Map<ServletContext,Listener> listeners = new HashMap<ServletContext,Listener>();
public synchronized void contextDestroyed(ServletContextEvent event) {
Listener l = listeners.get(event.getServletContext());
Dispatcher.removeDispatcherListener(l);
listeners.remove(event.getServletContext());
}
public synchronized void contextInitialized(ServletContextEvent event) {
Listener l = new Listener(event.getServletContext());
Dispatcher.addDispatcherListener(l);
listeners.put(event.getServletContext(), l);
}
private class Listener implements DispatcherListener {
private ServletContext servletContext;
public Listener(ServletContext ctx) {
this.servletContext = ctx;
}
public void dispatcherInitialized(Dispatcher du) {
Configuration config = du.getConfigurationManager().getConfiguration();
String key;
PackageConfig packageConfig;
for (Iterator iter = config.getPackageConfigNames().iterator();
iter.hasNext();) {
key = (String) iter.next();
packageConfig = config.getPackageConfig(key);
if (packageConfig.getExternalRefResolver()instanceof ServletContextAware) {
((ServletContextAware) packageConfig.getExternalRefResolver()).setServletContext(servletContext);
}
}
}
public void dispatcherDestroyed(Dispatcher du) {
}
}
}