com.webobjects.eocontrol
Class EOObserverProxy

java.lang.Object
  |
  +--com.webobjects.eocontrol.EODelayedObserver
        |
        +--com.webobjects.eocontrol.EOObserverProxy

All Implemented Interfaces:

EOObserving

public class EOObserverProxy

extends EODelayedObserver

The EOObserverProxy class is a part of EOControl's change tracking mechanism. It provides a means for objects that can't inherit from EODelayedObserver to handle subjectChanged messages.

An EOObserverProxy has a target object on whose behalf it observes objects. EOObserverProxy overrides subjectChanged to send an action message to its target object, allowing the target to act as though it had received subjectChanged directly from an EODelayedObserverQueue.

See Also:

EOObserverCenter, EODelayedObserverQueue

Field Summary

Fields inherited from class com.webobjects.eocontrol.EODelayedObserver

ObserverNumberOfPriorities, ObserverPriorityFifth, ObserverPriorityFirst, ObserverPriorityFourth, ObserverPriorityImmediate, ObserverPriorityLater, ObserverPrioritySecond, ObserverPrioritySixth, ObserverPriorityThird

Constructor Summary

EOObserverProxy(Object target, NSSelector action, int priority)
Creates a new EOObserverProxy to send action to target upon receiving a subjectChanged message.

Method Summary

int	priority() Returns the priority of the action.
void	subjectChanged() Implemented to react to a change in an observed object.

Methods inherited from class com.webobjects.eocontrol.EODelayedObserver

discardPendingNotification, objectWillChange, observerQueue

Methods inherited from class java.lang.Object

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

Constructor Detail

EOObserverProxy

public EOObserverProxy(Object target,
                       NSSelector action,
                       int priority)

Creates a new EOObserverProxy to send action to target upon receiving a subjectChanged message. action should be a selector for a typical action method, taking one java.util.Object argument and returning void. priority indicates when the receiver is sent this message from EODelayedObserverQueue's notifyObserversUpToPriority method.

Parameters:

target - the target object on whose behalf EOObserverProxy observes objects

action - the selector (a typical action method)

priority - the priority of the action

Method Detail

priority

public int priority()

Returns the priority of the action.

Overrides:

priority in class EODelayedObserver

Returns:

the priority of the action

See Also:

EODelayedObserver.ObserverPriorityImmediate, EODelayedObserver.ObserverPriorityFirst, EODelayedObserver.ObserverPrioritySecond, EODelayedObserver.ObserverPriorityThird, EODelayedObserver.ObserverPriorityFourth, EODelayedObserver.ObserverPriorityFifth, EODelayedObserver.ObserverPrioritySixth, EODelayedObserver.ObserverPriorityLater, EODelayedObserverQueue, EODelayedObserver

subjectChanged

public void subjectChanged()

Implemented to react to a change in an observed object. Sends the action to the target registered with the receiver.

Specified by:

subjectChanged in class EODelayedObserver