/*
* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
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}
* method, which invokes the
* {@code checkGuard} 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();
}
}