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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 string value of a system
   30    * property 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 value of the system
   36    * property named <code>"prop"</code> as a privileged action: <p>
   37    *
   38    * <pre>
   39    * String s = java.security.AccessController.doPrivileged
   40    *                      (new GetPropertyAction("prop"));
   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 GetPropertyAction
   50           implements java.security.PrivilegedAction<String> {
   51       private String theProp;
   52       private String defaultVal;
   53   
   54       /**
   55        * Constructor that takes the name of the system property whose
   56        * string value needs to be determined.
   57        *
   58        * @param theProp the name of the system property.
   59        */
   60       public GetPropertyAction(String theProp) {
   61           this.theProp = theProp;
   62       }
   63   
   64       /**
   65        * Constructor that takes the name of the system property and the default
   66        * value of that property.
   67        *
   68        * @param theProp the name of the system property.
   69        * @param defaulVal the default value.
   70        */
   71       public GetPropertyAction(String theProp, String defaultVal) {
   72           this.theProp = theProp;
   73           this.defaultVal = defaultVal;
   74       }
   75   
   76       /**
   77        * Determines the string value of the system property whose
   78        * name was specified in the constructor.
   79        *
   80        * @return the string value of the system property,
   81        *         or the default value if there is no property with that key.
   82        */
   83       public String run() {
   84           String value = System.getProperty(theProp);
   85           return (value == null) ? defaultVal : value;
   86       }
   87   }

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