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 object) throws SecurityException;

  39. }