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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
    6    * under the terms of the GNU General Public License version 2 only, as
    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
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   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   }

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