1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * 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}, 33 * with a single {@code object} argument. {@code checkGuard} is 34 * invoked (by the GuardedObject {@code getObject} method) 35 * to determine whether or not to allow access to the object. 36 * 37 * @see GuardedObject 38 * 39 * @author Roland Schemers 40 * @author Li Gong 41 */ 42 43 public interface Guard { 44 45 /** 46 * Determines whether or not to allow access to the guarded object 47 * {@code object}. Returns silently if access is allowed. 48 * Otherwise, throws a SecurityException. 49 * 50 * @param object the object being protected by the guard. 51 * 52 * @exception SecurityException if access is denied. 53 * 54 */ 55 void checkGuard(Object object) throws SecurityException; 56 } 57
