java.security
Class GuardedObject

java.lang.Object
  |
  +--java.security.GuardedObject

All Implemented Interfaces:

Serializable

public class GuardedObject

extends Object

implements Serializable

Untamed: A GuardedObject is an object that is used to protect access to another object.

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 getObject method, which invokes the checkGuard method on the Guard object that is guarding access. If access is not allowed, an exception is thrown.

Version:

1.12 01/12/03

Author:

Roland Schemers, Li Gong

See Also:

Guard, Permission, Serialized Form

Field Summary

private Guard	guard
private Object	object

Constructor Summary

GuardedObject(Object object, Guard guard)
Enabled: Constructs a GuardedObject using the specified object and guard.

Method Summary

Object	getObject() Enabled: Retrieves the guarded object, or throws an exception if access to the guarded object is denied by the guard.
private void	writeObject(ObjectOutputStream oos) Writes this object out to a stream (i.e., serializes it).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

object

private Object object

guard

private Guard guard

Constructor Detail

GuardedObject

public GuardedObject(Object object,
                     Guard guard)

Enabled: 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.

Parameters:

object - the object to be guarded.

guard - the Guard object that guards access to the object.

Method Detail

getObject

public Object getObject()
                 throws SecurityException

Enabled: Retrieves the guarded object, or throws an exception if access to the guarded object is denied by the guard.

Returns:

the guarded object.

SecurityException

writeObject

private void writeObject(ObjectOutputStream oos)
                  throws IOException

Writes this object out to a stream (i.e., serializes it). We check the guard if there is one.

IOException