Class GuardedObject

java.lang.Object
java.security.GuardedObject
All Implemented Interfaces:
Serializable
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.

Since:
1.2
See Also:

  • Constructor Summary

    Constructors
    Constructor
    Description
    GuardedObject(Object object, Guard guard)
    Constructs a GuardedObject using the specified object and guard.

  • Method Summary

    Modifier and Type
    Method
    Description
    Object
    getObject()
    Retrieves the guarded object, or throws an exception if access to the guarded object is denied by the guard.

    Methods declared in class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
    boolean
    equals(Object o)
    Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    May cause performance issues, deadlocks and hangs.
    final Class<? extends Object>
    getClass()
    Answers the unique instance of java.lang.Class which represents the class of the receiver.
    int
    hashCode()
    Answers an integer hash code for the receiver.
    final void
    notify()
    Causes one thread which is waiting on the receiver to be made ready to run.
    final void
    notifyAll()
    Causes all threads which are waiting on the receiver to be made ready to run.
    String
    toString()
    Answers a string containing a concise, human-readable description of the receiver.
    final void
    wait()
    Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
    final void
    wait(long time)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
    final void
    wait(long time, int frac)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

  • Constructor Details

    • GuardedObject

      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.

  • Method Details

    • getObject

      public Object getObject() throws SecurityException
      Retrieves the guarded object, or throws an exception if access to the guarded object is denied by the guard.
      Returns:
      the guarded object.
      Throws:
      SecurityException - if access to the guarded object is denied.