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103 lines
2.3 KiB
103 lines
2.3 KiB
/*
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* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.security;
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/**
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* A GuardedObject is an object that is used to protect access to
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* another object.
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*
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* <p>A GuardedObject encapsulates a target object and a Guard object,
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* such that access to the target object is possible
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* only if the Guard object allows it.
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* Once an object is encapsulated by a GuardedObject,
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* access to that object is controlled by the {@code getObject}
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* method, which invokes the
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* {@code checkGuard} method on the Guard object that is
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* guarding access. If access is not allowed,
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* an exception is thrown.
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*
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* @see Guard
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* @see Permission
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*
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* @author Roland Schemers
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* @author Li Gong
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*/
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public class GuardedObject implements java.io.Serializable {
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private static final long serialVersionUID = -5240450096227834308L;
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private Object object; // the object we are guarding
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private Guard guard; // the guard
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/**
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* Constructs a GuardedObject using the specified object and guard.
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* If the Guard object is null, then no restrictions will
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* be placed on who can access the object.
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*
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* @param object the object to be guarded.
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*
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* @param guard the Guard object that guards access to the object.
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*/
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public GuardedObject(Object object, Guard guard)
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{
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this.guard = guard;
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this.object = object;
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}
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/**
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* Retrieves the guarded object, or throws an exception if access
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* to the guarded object is denied by the guard.
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*
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* @return the guarded object.
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*
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* @exception SecurityException if access to the guarded object is
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* denied.
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*/
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public Object getObject()
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throws SecurityException
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{
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if (guard != null)
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guard.checkGuard(object);
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return object;
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}
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/**
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* Writes this object out to a stream (i.e., serializes it).
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* We check the guard if there is one.
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*/
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private void writeObject(java.io.ObjectOutputStream oos)
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throws java.io.IOException
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{
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if (guard != null)
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guard.checkGuard(object);
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oos.defaultWriteObject();
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}
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}
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