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1 /*
2  * @(#)Guard.java 1.12 03/12/19
3  *
4  * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5  * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6  */
7
8 package java.security;
9
10 /**
11  * <p> This interface represents a guard, which is an object that is used
12  * to protect access to another object.
13  *
14  * <p>This interface contains a single method, <code>checkGuard</code>,
15  * with a single <code>object</code> argument. <code>checkGuard</code> is
16  * invoked (by the GuardedObject <code>getObject</code> method)
17  * to determine whether or not to allow access to the object.
18  *
19  * @see GuardedObject
20  *
21  * @version 1.12 03/12/19
22  * @author Roland Schemers
23  * @author Li Gong
24  */
25
26 public interface Guard {
27
28     /**
29      * Determines whether or not to allow access to the guarded object
30      * <code>object</code>. Returns silently if access is allowed.
31      * Otherwise, throws a SecurityException.
32      *
33      * @param object the object being protected by the guard.
34      *
35      * @exception SecurityException if access is denied.
36      *
37      */
38     void checkGuard(Object JavaDoc object) throws SecurityException JavaDoc;
39 }
40
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