/*
* $Id: ServletContextSingleton.java 651946 2008-04-27 13:41:38Z apetrelli $
*
* 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.config;
import javax.servlet.ServletContext;
/**
* This singleton holds an instance of the web servlet context.
* <p/>
* This is needed for running Struts on Weblogic Server 6.1
* because there is no provision to retrieve the servlet context
* from the web session object.
* <p/>
* This class is created to bet that this singleton can be set by
* {@link org.apache.struts2.dispatcher.FilterDispatcherCompatWeblogic61}
* before the servlet context is needed by
* {@link org.apache.struts2.lifecycle.SessionLifecycleListener}
* which will use this object to get it.
*
*/
public class ServletContextSingleton {
/**
* The web servlet context. Holding this is the
* purpose of this singleton.
*/
private ServletContext servletContext;
/**
* The sole instance of this class.
*/
private static ServletContextSingleton singleton;
/**
* Constructor which cannot be called
* publicly.
*/
private ServletContextSingleton() {
}
/**
* Answers the singleton.
* <p/>
* At some point, the caller must populate the web servlet
* context.
*
* @return Answers the singleton instance of this class
*/
public static ServletContextSingleton getInstance() {
if (singleton == null) {
singleton = new ServletContextSingleton();
}
return singleton;
}
/**
* Gets the servlet context
*
* @return The web servlet context
*/
public ServletContext getServletContext() {
return servletContext;
}
/**
* Sets the servlet context
*
* @param context The web servlet context
*/
public void setServletContext(ServletContext context) {
servletContext = context;
}
}
|