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25 
26 package com.sun.corba.se.impl.orbutil ;
27 
28 /**
29  * A convenience class for retrieving the string value of a system
30  * property as a privileged action.  This class is directly copied
31  * from sun.security.action.GetPropertyAction in order to avoid
32  * depending on the sun.security.action package.
33  *
34  * <p>An instance of this class can be used as the argument of
35  * <code>AccessController.doPrivileged</code>.
36  *
37  * <p>The following code retrieves the value of the system
38  * property named <code>"prop"</code> as a privileged action: <p>
39  *
40  * <pre>
41  * String s = (String) java.security.AccessController.doPrivileged(
42  *                         new GetPropertyAction("prop"));
43  * </pre>
44  *
45  * @author Roland Schemers
46  * @author Ken Cavanaugh
47  * @see java.security.PrivilegedAction
48  * @see java.security.AccessController
49  */
50 
51 public class GetPropertyAction implements java.security.PrivilegedAction {
52     private String theProp;
53     private String defaultVal;
54 
55     /**
56      * Constructor that takes the name of the system property whose
57      * string value needs to be determined.
58      *
59      * @param theProp the name of the system property.
60      */
GetPropertyAction(String theProp)61     public GetPropertyAction(String theProp) {
62         this.theProp = theProp;
63     }
64 
65     /**
66      * Constructor that takes the name of the system property and the default
67      * value of that property.
68      *
69      * @param theProp the name of the system property.
70      * @param defaulVal the default value.
71      */
GetPropertyAction(String theProp, String defaultVal)72     public GetPropertyAction(String theProp, String defaultVal) {
73         this.theProp = theProp;
74         this.defaultVal = defaultVal;
75     }
76 
77     /**
78      * Determines the string value of the system property whose
79      * name was specified in the constructor.
80      *
81      * @return the string value of the system property,
82      *         or the default value if there is no property with that key.
83      */
run()84     public Object run() {
85         String value = System.getProperty(theProp);
86         return (value == null) ? defaultVal : value;
87     }
88 }
89