01 /*
02 * Copyright 1997-1998 Sun Microsystems, Inc. All Rights Reserved.
03 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04 *
05 * This code is free software; you can redistribute it and/or modify it
06 * under the terms of the GNU General Public License version 2 only, as
07 * published by the Free Software Foundation. Sun designates this
08 * particular file as subject to the "Classpath" exception as provided
09 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package java.security;
27
28 /**
29 * <p> This interface represents a guard, which is an object that is used
30 * to protect access to another object.
31 *
32 * <p>This interface contains a single method, <code>checkGuard</code>,
33 * with a single <code>object</code> argument. <code>checkGuard</code> is
34 * invoked (by the GuardedObject <code>getObject</code> method)
35 * to determine whether or not to allow access to the object.
36 *
37 * @see GuardedObject
38 *
39 * @version 1.19 07/05/05
40 * @author Roland Schemers
41 * @author Li Gong
42 */
43
44 public interface Guard {
45
46 /**
47 * Determines whether or not to allow access to the guarded object
48 * <code>object</code>. Returns silently if access is allowed.
49 * Otherwise, throws a SecurityException.
50 *
51 * @param object the object being protected by the guard.
52 *
53 * @exception SecurityException if access is denied.
54 *
55 */
56 void checkGuard(Object object) throws SecurityException;
57 }
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