GuardedObject

Page Summary

GuardedObject protects access to an object using a Guard object, allowing access only if the Guard permits it.
Access to the encapsulated object is controlled by the getObject() method, which invokes the Guard's checkGuard() method.
If access is denied by the Guard, a SecurityException is thrown.
Constructing a GuardedObject with a null Guard implies unrestricted access to the object.
GuardedObject extends the Object class and implements the Serializable interface.

public class GuardedObject extends Object
implements Serializable

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.

Public Constructor Summary

GuardedObject(Object object, Guard guard)

Constructs a GuardedObject using the specified object and guard.

Public Method Summary

Object

getObject()

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

Inherited Method Summary

From class java.lang.Object

Object	clone() Creates and returns a copy of this `Object`.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of `Class` that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.

Public Constructors

public GuardedObject (Object object, Guard 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.

Parameters

object	the object to be guarded.
guard	the Guard object that guards access to the object.

Public Methods

public Object getObject ()