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1   /* Copyright 2004 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.acegisecurity.runas;
17  
18  import org.acegisecurity.Authentication;
19  import org.acegisecurity.ConfigAttribute;
20  import org.acegisecurity.ConfigAttributeDefinition;
21  import org.acegisecurity.RunAsManager;
22  
23  
24  /***
25   * Implementation of a {@link RunAsManager} that does nothing.
26   * 
27   * <p>
28   * This class should be used if you do not require run-as authenticaiton
29   * replacement functionality.
30   * </p>
31   *
32   * @author Ben Alex
33   * @version $Id: NullRunAsManager.java,v 1.2 2005/11/17 00:55:51 benalex Exp $
34   */
35  public class NullRunAsManager implements RunAsManager {
36      //~ Methods ================================================================
37  
38      public Authentication buildRunAs(Authentication authentication,
39          Object object, ConfigAttributeDefinition config) {
40          return null;
41      }
42  
43      public boolean supports(ConfigAttribute attribute) {
44          return false;
45      }
46  
47      public boolean supports(Class clazz) {
48          return true;
49      }
50  }