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25 
26 package sun.security.action;
27 
28 /**
29  * A convenience class for retrieving the integer 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 integer value of the system
36  * property named <code>"prop"</code> as a privileged action. Since it does
37  * not pass a default value to be used in case the property
38  * <code>"prop"</code> is not defined, it has to check the result for
39  * <code>null</code>: <p>
40  *
41  * <pre>
42  * Integer tmp = java.security.AccessController.doPrivileged
43  *     (new sun.security.action.GetIntegerAction("prop"));
44  * int i;
45  * if (tmp != null) {
46  *     i = tmp.intValue();
47  * }
48  * </pre>
49  *
50  * <p>The following code retrieves the integer value of the system
51  * property named <code>"prop"</code> as a privileged action, and also passes
52  * a default value to be used in case the property <code>"prop"</code> is not
53  * defined: <p>
54  *
55  * <pre>
56  * int i = ((Integer)java.security.AccessController.doPrivileged(
57  *                         new GetIntegerAction("prop", 3))).intValue();
58  * </pre>
59  *
60  * @author Roland Schemers
61  * @see java.security.PrivilegedAction
62  * @see java.security.AccessController
63  * @since 1.2
64  */
65 
66 public class GetIntegerAction
67         implements java.security.PrivilegedAction<Integer> {
68     private String theProp;
69     private int defaultVal;
70     private boolean defaultSet = false;
71 
72     /**
73      * Constructor that takes the name of the system property whose integer
74      * value needs to be determined.
75      *
76      * @param theProp the name of the system property.
77      */
GetIntegerAction(String theProp)78     public GetIntegerAction(String theProp) {
79         this.theProp = theProp;
80     }
81 
82     /**
83      * Constructor that takes the name of the system property and the default
84      * value of that property.
85      *
86      * @param theProp the name of the system property.
87      * @param defaulVal the default value.
88      */
GetIntegerAction(String theProp, int defaultVal)89     public GetIntegerAction(String theProp, int defaultVal) {
90         this.theProp = theProp;
91         this.defaultVal = defaultVal;
92         this.defaultSet = true;
93     }
94 
95     /**
96      * Determines the integer value of the system property whose name was
97      * specified in the constructor.
98      *
99      * <p>If there is no property of the specified name, or if the property
100      * does not have the correct numeric format, then an <code>Integer</code>
101      * object representing the default value that was specified in the
102      * constructor is returned, or <code>null</code> if no default value was
103      * specified.
104      *
105      * @return the <code>Integer</code> value of the property.
106      */
run()107     public Integer run() {
108         Integer value = Integer.getInteger(theProp);
109         if ((value == null) && defaultSet)
110             return new Integer(defaultVal);
111         return value;
112     }
113 }
114