oracle.ide.model

Class IdeSubject

java.lang.Object

oracle.ide.model.IdeSubject

All Implemented Interfaces:

Subject

Direct Known Subclasses:

IdeVetoableSubject

public class IdeSubject
extends java.lang.Object
implements Subject

The IdeSubject class defines the API to register Observers that are interested in receiving notifications of Subject changes. Classes that can have multiple views in particular must implement the Subject interface so that all observing views can be notified when changes have occurred.

See Also:

Observer, UpdateMessage

Constructor Summary

Constructors

Constructor and Description
IdeSubject()

Method Summary

Methods

Modifier and Type	Method and Description
void	attach(Observer observer) Registers an Observer interested in being notified when the internal state of the class implementing the Subject interface changes.
void	detach(Observer observer) Unregisters an observer that is not interested anymore in being notified when the internal state of the class implementing the Subject interface changes.
void	notifyObservers(java.lang.Object observed, UpdateMessage change) Notifies all observers that the state of the subject has changed.

Methods inherited from class java.lang.Object

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

Constructor Detail

IdeSubject

public IdeSubject()

Method Detail

attach

public final void attach(Observer observer)

Registers an Observer interested in being notified when the internal state of the class implementing the Subject interface changes. If the observer is already attached, this method does nothing.

Specified by:

attach in interface Subject

Parameters:

observer - the Observer that should receive notification messages from this Subject.

detach

public final void detach(Observer observer)

Unregisters an observer that is not interested anymore in being notified when the internal state of the class implementing the Subject interface changes.

Specified by:

detach in interface Subject

Parameters:

observer - the Observer that should no longer receive notification messages from this Subject.

notifyObservers

public final void notifyObservers(java.lang.Object observed,
                   UpdateMessage change)

Notifies all observers that the state of the subject has changed.

Specified by:

notifyObservers in interface Subject

Parameters:

subject - the subject whose state has changed.

change - what changed.