--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/security/GuardedObject.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,102 @@
+/*
+ * Copyright 1997-2004 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package java.security;
+
+/**
+ * A GuardedObject is an object that is used to protect access to
+ * another object.
+ *
+ * <p>A GuardedObject encapsulates a target object and a Guard object,
+ * such that access to the target object is possible
+ * only if the Guard object allows it.
+ * Once an object is encapsulated by a GuardedObject,
+ * access to that object is controlled by the <code>getObject</code>
+ * method, which invokes the
+ * <code>checkGuard</code> method on the Guard object that is
+ * guarding access. If access is not allowed,
+ * an exception is thrown.
+ *
+ * @see Guard
+ * @see Permission
+ *
+ * @author Roland Schemers
+ * @author Li Gong
+ */
+
+public class GuardedObject implements java.io.Serializable {
+
+    private static final long serialVersionUID = -5240450096227834308L;
+
+    private Object object; // the object we are guarding
+    private Guard guard;   // the guard
+
+    /**
+     * Constructs a GuardedObject using the specified object and guard.
+     * If the Guard object is null, then no restrictions will
+     * be placed on who can access the object.
+     *
+     * @param object the object to be guarded.
+     *
+     * @param guard the Guard object that guards access to the object.
+     */
+
+    public GuardedObject(Object object, Guard guard)
+    {
+        this.guard = guard;
+        this.object = object;
+    }
+
+    /**
+     * Retrieves the guarded object, or throws an exception if access
+     * to the guarded object is denied by the guard.
+     *
+     * @return the guarded object.
+     *
+     * @exception SecurityException if access to the guarded object is
+     * denied.
+     */
+    public Object getObject()
+        throws SecurityException
+    {
+        if (guard != null)
+            guard.checkGuard(object);
+
+        return object;
+    }
+
+    /**
+     * Writes this object out to a stream (i.e., serializes it).
+     * We check the guard if there is one.
+     */
+    private void writeObject(java.io.ObjectOutputStream oos)
+        throws java.io.IOException
+    {
+        if (guard != null)
+            guard.checkGuard(object);
+
+        oos.defaultWriteObject();
+    }
+}