151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/* 219b88cdf6c245d9a7d1e4996d494be4e14f546a6Sergio Giro * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This code is free software; you can redistribute it and/or modify it 651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * under the terms of the GNU General Public License version 2 only, as 751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * published by the Free Software Foundation. Oracle designates this 851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * particular file as subject to the "Classpath" exception as provided 951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * by Oracle in the LICENSE file that accompanied this code. 1051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This code is distributed in the hope that it will be useful, but WITHOUT 1251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * version 2 for more details (a copy is included in the LICENSE file that 1551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * accompanied this code). 1651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * You should have received a copy of the GNU General Public License version 1851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 2 along with this work; if not, write to the Free Software Foundation, 1951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 2151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or visit www.oracle.com if you need additional information or have any 2351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * questions. 2451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 2551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 2651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskipackage java.security; 2751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 2851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/** 2951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * A GuardedObject is an object that is used to protect access to 3051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * another object. 3151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 3251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * <p>A GuardedObject encapsulates a target object and a Guard object, 3351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * such that access to the target object is possible 3451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * only if the Guard object allows it. 3551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Once an object is encapsulated by a GuardedObject, 3619b88cdf6c245d9a7d1e4996d494be4e14f546a6Sergio Giro * access to that object is controlled by the {@code getObject} 3751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * method, which invokes the 3819b88cdf6c245d9a7d1e4996d494be4e14f546a6Sergio Giro * {@code checkGuard} method on the Guard object that is 3951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * guarding access. If access is not allowed, 4051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * an exception is thrown. 4151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 4251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see Guard 4351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @see Permission 4451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 4551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @author Roland Schemers 4651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @author Li Gong 4751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 4851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 4951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskipublic class GuardedObject implements java.io.Serializable { 5051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 5151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private static final long serialVersionUID = -5240450096227834308L; 5251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 5351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private Object object; // the object we are guarding 5451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private Guard guard; // the guard 5551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 5651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 5751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Constructs a GuardedObject using the specified object and guard. 5851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * If the Guard object is null, then no restrictions will 5951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * be placed on who can access the object. 6051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 6151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param object the object to be guarded. 6251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 6351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @param guard the Guard object that guards access to the object. 6451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 6551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 6651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public GuardedObject(Object object, Guard guard) 6751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski { 6851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this.guard = guard; 6951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this.object = object; 7051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 7151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 7251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 7351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Retrieves the guarded object, or throws an exception if access 7451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * to the guarded object is denied by the guard. 7551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 7651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @return the guarded object. 7751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 7851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * @exception SecurityException if access to the guarded object is 7951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * denied. 8051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 8151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public Object getObject() 8251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throws SecurityException 8351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski { 8451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (guard != null) 8551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski guard.checkGuard(object); 8651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 8751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return object; 8851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 8951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 9051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski /** 9151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Writes this object out to a stream (i.e., serializes it). 9251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * We check the guard if there is one. 9351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 9451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private void writeObject(java.io.ObjectOutputStream oos) 9551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski throws java.io.IOException 9651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski { 9751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (guard != null) 9851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski guard.checkGuard(object); 9951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 10051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski oos.defaultWriteObject(); 10151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 10251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski} 103