/*
* $Id: SpringExternalReferenceResolverSetupListener.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.spring.lifecycle;
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 org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.web.context.support.WebApplicationContextUtils;
import com.opensymphony.xwork2.config.Configuration;
import com.opensymphony.xwork2.config.ExternalReferenceResolver;
import com.opensymphony.xwork2.config.entities.PackageConfig;
/**
* Setup any {@link com.opensymphony.xwork2.config.ExternalReferenceResolver}s
* that implement the ApplicationContextAware interface from the Spring
* framework. Relies on Spring's
* {@link org.springframework.web.context.ContextLoaderListener}having been
* called first.
*/
public class SpringExternalReferenceResolverSetupListener implements
ServletContextListener {
private Map<ServletContext,Listener> listeners = new HashMap<ServletContext,Listener>();
/* (non-Javadoc)
* @see javax.servlet.ServletContextListener#contextDestroyed(javax.servlet.ServletContextEvent)
*/
public synchronized void contextDestroyed(ServletContextEvent event) {
Listener l = listeners.get(event.getServletContext());
Dispatcher.removeDispatcherListener(l);
listeners.remove(event.getServletContext());
}
/* (non-Javadoc)
* @see javax.servlet.ServletContextListener#contextInitialized(javax.servlet.ServletContextEvent)
*/
public synchronized void contextInitialized(ServletContextEvent event) {
Listener l = new Listener(event.getServletContext());
Dispatcher.addDispatcherListener(l);
listeners.put(event.getServletContext(), l);
}
/**
* Handles initializing and cleaning up the dispatcher
* @author brownd
*
*/
private class Listener implements DispatcherListener {
private ServletContext servletContext;
/**
* Constructs the listener
*
* @param ctx The servlet context
*/
public Listener(ServletContext ctx) {
this.servletContext = ctx;
}
/* (non-Javadoc)
* @see org.apache.struts2.dispatcher.DispatcherListener#dispatcherInitialized(org.apache.struts2.dispatcher.Dispatcher)
*/
public void dispatcherInitialized(Dispatcher du) {
ApplicationContext appContext = WebApplicationContextUtils
.getWebApplicationContext(servletContext);
Configuration xworkConfig = du.getConfigurationManager().getConfiguration();
Map packageConfigs = xworkConfig.getPackageConfigs();
Iterator i = packageConfigs.values().iterator();
while (i.hasNext()) {
PackageConfig packageConfig = (PackageConfig) i.next();
ExternalReferenceResolver resolver = packageConfig.getExternalRefResolver();
if (resolver == null || !(resolver instanceof ApplicationContextAware))
continue;
ApplicationContextAware contextAware = (ApplicationContextAware) resolver;
contextAware.setApplicationContext(appContext);
}
}
/* (non-Javadoc)
* @see org.apache.struts2.dispatcher.DispatcherListener#dispatcherDestroyed(org.apache.struts2.dispatcher.Dispatcher)
*/
public void dispatcherDestroyed(Dispatcher du) {
}
}
}