/*
 * $Id$
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.portlet.context;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

/**
 * Some of the factory/managers (e.g. the ObjectFactory) need access to
 * the {@link org.apache.struts2.ServletActionContext} object when initializing.
 * This {@link javax.servlet.ServletContextListener} keeps a reference to the
 * {@link javax.servlet.ServletContext} and exposes it through a <code>public static</code>
 * method.
 *
 */
public class ServletContextHolderListener implements ServletContextListener {

    private static ServletContext context = null;

    /**
     * @return The current servlet context
     */
    public static ServletContext getServletContext() {
        return context;
    }

    /**
     * Stores the reference to the {@link ServletContext}.
     *
     * @see javax.servlet.ServletContextListener#contextInitialized(javax.servlet.ServletContextEvent)
     */
    public void contextInitialized(ServletContextEvent event) {
        context = event.getServletContext();

    }

    /**
     * @see javax.servlet.ServletContextListener#contextDestroyed(javax.servlet.ServletContextEvent)
     */
    public void contextDestroyed(ServletContextEvent event) {
        context = null;
    }

}
