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1   /*
2    * Copyright (c) 1998, 2006, Oracle and/or its affiliates. All rights reserved.
3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4    *
5    * This code is free software; you can redistribute it and/or modify it
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7    * published by the Free Software Foundation.  Oracle designates this
8    * particular file as subject to the "Classpath" exception as provided
9    * by Oracle in the LICENSE file that accompanied this code.
10   *
11   * This code is distributed in the hope that it will be useful, but WITHOUT
12   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14   * version 2 for more details (a copy is included in the LICENSE file that
15   * accompanied this code).
16   *
17   * You should have received a copy of the GNU General Public License version
18   * 2 along with this work; if not, write to the Free Software Foundation,
19   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20   *
21   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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24   */
25  
26  package sun.security.action;
27  
28  /**
29   * A convenience class for retrieving the boolean value of a system property
30   * as a privileged action.
31   *
32   * <p>An instance of this class can be used as the argument of
33   * <code>AccessController.doPrivileged</code>.
34   *
35   * <p>The following code retrieves the boolean value of the system
36   * property named <code>"prop"</code> as a privileged action: <p>
37   *
38   * <pre>
39   * boolean b = java.security.AccessController.doPrivileged
40   *              (new GetBooleanAction("prop")).booleanValue();
41   * </pre>
42   *
43   * @author Roland Schemers
44   * @see java.security.PrivilegedAction
45   * @see java.security.AccessController
46   * @since 1.2
47   */
48  
49  public class GetBooleanAction
50          implements java.security.PrivilegedAction<Boolean> {
51      private String theProp;
52  
53      /**
54       * Constructor that takes the name of the system property whose boolean
55       * value needs to be determined.
56       *
57       * @param theProp the name of the system property.
58       */
59      public GetBooleanAction(String theProp) {
60          this.theProp = theProp;
61      }
62  
63      /**
64       * Determines the boolean value of the system property whose name was
65       * specified in the constructor.
66       *
67       * @return the <code>Boolean</code> value of the system property.
68       */
69      public Boolean run() {
70          return Boolean.getBoolean(theProp);
71      }
72  }