0N/A/*
2362N/A * Copyright (c) 1997, 2004, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
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
2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
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 *
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 *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2362N/A * or visit www.oracle.com if you need additional information or have any
2362N/A * questions.
0N/A */
0N/A
0N/Apackage java.security;
0N/A
0N/A/**
0N/A * A GuardedObject is an object that is used to protect access to
0N/A * another object.
0N/A *
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 *
0N/A * @see Guard
0N/A * @see Permission
0N/A *
0N/A * @author Roland Schemers
0N/A * @author Li Gong
0N/A */
0N/A
0N/Apublic class GuardedObject implements java.io.Serializable {
0N/A
0N/A private static final long serialVersionUID = -5240450096227834308L;
0N/A
0N/A private Object object; // the object we are guarding
0N/A private Guard guard; // the guard
0N/A
0N/A /**
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 *
0N/A * @param object the object to be guarded.
0N/A *
0N/A * @param guard the Guard object that guards access to the object.
0N/A */
0N/A
0N/A public GuardedObject(Object object, Guard guard)
0N/A {
0N/A this.guard = guard;
0N/A this.object = object;
0N/A }
0N/A
0N/A /**
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 *
0N/A * @return the guarded object.
0N/A *
0N/A * @exception SecurityException if access to the guarded object is
0N/A * denied.
0N/A */
0N/A public Object getObject()
0N/A throws SecurityException
0N/A {
0N/A if (guard != null)
0N/A guard.checkGuard(object);
0N/A
0N/A return object;
0N/A }
0N/A
0N/A /**
0N/A * Writes this object out to a stream (i.e., serializes it).
0N/A * We check the guard if there is one.
0N/A */
0N/A private void writeObject(java.io.ObjectOutputStream oos)
0N/A throws java.io.IOException
0N/A {
0N/A if (guard != null)
0N/A guard.checkGuard(object);
0N/A
0N/A oos.defaultWriteObject();
0N/A }
0N/A}