01: /*
02: * @(#)Guard.java 1.15 06/10/10
03: *
04: * Copyright 1990-2006 Sun Microsystems, Inc. All Rights Reserved.
05: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License version
09: * 2 only, as published by the Free Software Foundation.
10: *
11: * This program is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * General Public License version 2 for more details (a copy is
15: * included at /legal/license.txt).
16: *
17: * You should have received a copy of the GNU General Public License
18: * version 2 along with this work; if not, write to the Free Software
19: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA
21: *
22: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
23: * Clara, CA 95054 or visit www.sun.com if you need additional
24: * information or have any questions.
25: *
26: */
27:
28: package java.security;
29:
30: /**
31: * <p> This interface represents a guard, which is an object that is used
32: * to protect access to another object.
33: *
34: * <p>This interface contains a single method, <code>checkGuard</code>,
35: * with a single <code>object</code> argument. <code>checkGuard</code> is
36: * invoked (by the GuardedObject <code>getObject</code> method)
37: * to determine whether or not to allow access to the object.
38: *
39: * @see GuardedObject
40: *
41: * @version 1.9 00/02/02
42: * @author Roland Schemers
43: * @author Li Gong
44: */
45:
46: public interface Guard {
47:
48: /**
49: * Determines whether or not to allow access to the guarded object
50: * <code>object</code>. Returns silently if access is allowed.
51: * Otherwise, throws a SecurityException.
52: *
53: * @param object the object being protected by the guard.
54: *
55: * @exception SecurityException if access is denied.
56: *
57: */
58: void checkGuard(Object object) throws SecurityException;
59: }
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