GuardedObject.java revision 0
0N/A * Copyright 1997-2004 Sun Microsystems, Inc. All Rights Reserved. 0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 0N/A * This code is free software; you can redistribute it and/or modify it 0N/A * under the terms of the GNU General Public License version 2 only, as 0N/A * published by the Free Software Foundation. Sun designates this 0N/A * particular file as subject to the "Classpath" exception as provided 0N/A * by Sun in the LICENSE file that accompanied this code. 0N/A * This code is distributed in the hope that it will be useful, but WITHOUT 0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 0N/A * version 2 for more details (a copy is included in the LICENSE file that 0N/A * accompanied this code). 0N/A * You should have received a copy of the GNU General Public License version 0N/A * 2 along with this work; if not, write to the Free Software Foundation, 0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 0N/A * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 0N/A * CA 95054 USA or visit www.sun.com if you need additional information or 0N/A * have any questions. 0N/A * A GuardedObject is an object that is used to protect access to 0N/A * <p>A GuardedObject encapsulates a target object and a Guard object, 0N/A * such that access to the target object is possible 0N/A * only if the Guard object allows it. 0N/A * Once an object is encapsulated by a GuardedObject, 0N/A * access to that object is controlled by the <code>getObject</code> 0N/A * method, which invokes the 0N/A * <code>checkGuard</code> method on the Guard object that is 0N/A * guarding access. If access is not allowed, 0N/A * an exception is thrown. 0N/A * @author Roland Schemers 0N/A * Constructs a GuardedObject using the specified object and guard. 0N/A * If the Guard object is null, then no restrictions will 0N/A * be placed on who can access the object. 0N/A * @param object the object to be guarded. 0N/A * @param guard the Guard object that guards access to the object. 0N/A * Retrieves the guarded object, or throws an exception if access 0N/A * to the guarded object is denied by the guard. 0N/A * @return the guarded object. 0N/A * @exception SecurityException if access to the guarded object is 0N/A * Writes this object out to a stream (i.e., serializes it). 0N/A * We check the guard if there is one.