/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited

  *

  * 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.acegisecurity.ui.session;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import org.springframework.context.ApplicationContext;

 import org.springframework.web.context.support.WebApplicationContextUtils;

 import javax.servlet.ServletContext;

 import javax.servlet.http.HttpSessionEvent;

 import javax.servlet.http.HttpSessionListener;

 /**

  * Declared in web.xml as

  * <pre>

  * <listener>

  *     <listener-class>org.acegisecurity.ui.session.HttpSessionEventPublisher</listener-class>

  * </listener>

  * </pre>

  *

  * Publishes <code>HttpSessionApplicationEvent</code>s to the Spring Root WebApplicationContext. Maps

  * javax.servlet.http.HttpSessionListener.sessionCreated() to {@link HttpSessionCreatedEvent}. Maps

  * javax.servlet.http.HttpSessionListener.sessionDestroyed() to {@link HttpSessionDestroyedEvent}.

  *

  * @author Ray Krueger

  */

 public class HttpSessionEventPublisher implements HttpSessionListener {

     //~ Static fields/initializers =====================================================================================

     private static final Log log = LogFactory.getLog(HttpSessionEventPublisher.class);

     //~ Instance fields ================================================================================================

     //~ Methods ========================================================================================================

     ApplicationContext getContext(ServletContext servletContext) {

         return WebApplicationContextUtils.getWebApplicationContext(servletContext);

     }

     /**

      * Handles the HttpSessionEvent by publishing a {@link HttpSessionCreatedEvent} to the application

      * appContext.

      *

      * @param event HttpSessionEvent passed in by the container

      */

     public void sessionCreated(HttpSessionEvent event) {

         HttpSessionCreatedEvent e = new HttpSessionCreatedEvent(event.getSession());

         if (log.isDebugEnabled()) {

             log.debug("Publishing event: " + e);

         }

         getContext(event.getSession().getServletContext()).publishEvent(e);

     }

     /**

      * Handles the HttpSessionEvent by publishing a {@link HttpSessionDestroyedEvent} to the application

      * appContext.

      *

      * @param event The HttpSessionEvent pass in by the container

      */

     public void sessionDestroyed(HttpSessionEvent event) {

         HttpSessionDestroyedEvent e = new HttpSessionDestroyedEvent(event.getSession());

         if (log.isDebugEnabled()) {

             log.debug("Publishing event: " + e);

         }

         getContext(event.getSession().getServletContext()).publishEvent(e);

     }

 }