/* 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.context;

 import org.springframework.util.Assert;

 /**

  * A <code>static</code> field-based implementation of {@link

  * org.acegisecurity.context.SecurityContextHolderStrategy}.<p>This means that all instances in the JVM share the

  * same <code>SecurityContext</code>. This is generally useful with rich clients, such as Swing.</p>

  *

  * @author Ben Alex

  * @version $Id: SecurityContextHolder.java 1324 2006-02-12 06:29:53Z benalex $

  */

 public class GlobalSecurityContextHolderStrategy implements SecurityContextHolderStrategy {

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

     private static SecurityContext contextHolder;

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

     public void clearContext() {

         contextHolder = null;

     }

     public SecurityContext getContext() {

         if (contextHolder == null) {

             contextHolder = new SecurityContextImpl();

         }

         return contextHolder;

     }

     public void setContext(SecurityContext context) {

         Assert.notNull(context, "Only non-null SecurityContext instances are permitted");

         contextHolder = context;

     }

 }