org.gvsig.tools.observer

Interface Observer

All Known Subinterfaces:

ComplexObserver

public interface Observer

A interface to be implemented by objects that want to be informed of changes in Observable objects.

Version:

$Id$

Author:

gvSIG Team

See Also:

ComplexObserver

Method Summary

Methods

Modifier and Type	Method and Description
void	update(Observable observable, Object notification) Called whenever a Observable object is changed and this Observer has registered on it to receive notifications.

Method Detail

update

void update(Observable observable,
          Object notification)

Called whenever a Observable object is changed and this Observer has registered on it to receive notifications.

Implementations of this method will be called for each simple notification or, if a complex notification is created, for each of the child notifications.

In the latter case, don't assume any ordering in the notification between this Observer and other Observers listening to the same Observable.

In a complex notification scenario, if you want to receive only the complex notification and not each of the child notifications, just implement the ComplexObserver and prepare this method implementation to handle receiving DefaultComplexNotification instances as well as direct notification objects.

Parameters:

observable - the observable object.

notification - the notification data.