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1   /* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
2    *
3    * Licensed under the Apache License, Version 2.0 (the "License");
4    * you may not use this file except in compliance with the License.
5    * You may obtain a copy of the License at
6    *
7    *     http://www.apache.org/licenses/LICENSE-2.0
8    *
9    * Unless required by applicable law or agreed to in writing, software
10   * distributed under the License is distributed on an "AS IS" BASIS,
11   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12   * See the License for the specific language governing permissions and
13   * limitations under the License.
14   */
15  
16  package org.springframework.security.context;
17  
18  import org.springframework.util.Assert;
19  
20  
21  /**
22   * A <code>static</code> field-based implementation of {@link
23   * org.springframework.security.context.SecurityContextHolderStrategy}.<p>This means that all instances in the JVM share the
24   * same <code>SecurityContext</code>. This is generally useful with rich clients, such as Swing.</p>
25   *
26   * @author Ben Alex
27   * @version $Id: GlobalSecurityContextHolderStrategy.java 2217 2007-10-27 00:45:30Z luke_t $
28   */
29  public class GlobalSecurityContextHolderStrategy implements SecurityContextHolderStrategy {
30      //~ Static fields/initializers =====================================================================================
31  
32      private static SecurityContext contextHolder;
33  
34      //~ Methods ========================================================================================================
35  
36      public void clearContext() {
37          contextHolder = null;
38      }
39  
40      public SecurityContext getContext() {
41          if (contextHolder == null) {
42              contextHolder = new SecurityContextImpl();
43          }
44  
45          return contextHolder;
46      }
47  
48      public void setContext(SecurityContext context) {
49          Assert.notNull(context, "Only non-null SecurityContext instances are permitted");
50          contextHolder = context;
51      }
52  }