org.puremvc.java.patterns.observer
Class Observer

java.lang.Object
  org.puremvc.java.patterns.observer.Observer

All Implemented Interfaces:

IObserver

public class Observer
extends java.lang.Object
implements IObserver

A base IObserver implementation.

An Observer is an object that encapsulates information about an interested object with a method that should be called when a particular INotification is broadcast.

In PureMVC, the Observer class assumes these responsibilities:

• Encapsulate the notification (callback) method of the interested object.
• Encapsulate the notification context (this) of the interested object.
• Provide methods for setting the notification method and context.
• Provide a method for notifying the interested object.

See Also:

View, Notification

Constructor Summary

Observer(IFunction notify, java.lang.Object context)
Constructor.

Method Summary

boolean	compareNotifyContext(java.lang.Object object) Compare an object to the notification context.
java.lang.Object	getNotifyContext() Get the notification context.
IFunction	getNotifyMethod() Get the notification method.
void	notifyObserver(INotification notification) Notify the interested object.
void	setNotifyContext(java.lang.Object notifyContext) Set the notification context.
void	setNotifyMethod(IFunction notifyMethod) Set the notification method.

Methods inherited from class java.lang.Object

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

Constructor Detail

Observer

public Observer(IFunction notify,
                java.lang.Object context)

Constructor.

The notification method on the interested object should take one parameter of type INotification

Parameters:

notify - the notification method of the interested object

context - the notification context of the interested object

Method Detail

compareNotifyContext

public boolean compareNotifyContext(java.lang.Object object)

Compare an object to the notification context.

Specified by:

compareNotifyContext in interface IObserver

Parameters:

object - the object to compare

Returns:

boolean indicating if the object and the notification context are the same

notifyObserver

public void notifyObserver(INotification notification)

Notify the interested object.

Specified by:

notifyObserver in interface IObserver

Parameters:

notification - the INotification to pass to the interested object's notification method.

setNotifyContext

public void setNotifyContext(java.lang.Object notifyContext)

Set the notification context.

Specified by:

setNotifyContext in interface IObserver

Parameters:

notifyContext - the notification context (this) of the interested object.

setNotifyMethod

public void setNotifyMethod(IFunction notifyMethod)

Set the notification method.

The notification method should take one parameter of type INotification.

Specified by:

setNotifyMethod in interface IObserver

Parameters:

notifyMethod - the notification (callback) method of the interested object.

getNotifyMethod

public IFunction getNotifyMethod()

Get the notification method.

Returns:

the notification (callback) method of the interested object.

getNotifyContext

public java.lang.Object getNotifyContext()

Get the notification context.

Returns:

the notification context (this) of the interested object.