Package nz.ac.vuw.ecs.swen225.gp22.domain

Class Observable<S extends Observable<S>>

java.lang.Object

nz.ac.vuw.ecs.swen225.gp22.domain.Observable<S>

Direct Known Subclasses:

Entity

public abstract class Observable<S extends Observable<S>>
extends Object

A class can extend this so an instance of it can be observed by Observer objects.

Author:

Abdul

Constructor Summary

Constructors

Constructor	Description
Observable()

Method Summary

Modifier and Type	Method	Description
void	addObserver(Observer<S> observer)	Adds an Observer to the list of observers.
void	removeObserver(Observer<S> observer)	Removes an Observer from the list of observers.
void	updateObservers()	Calls the update() method for each observer attached to this object.

Methods inherited from class java.lang.Object

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

Constructor Details

Observable

public Observable()

Method Details

addObserver

public void addObserver(Observer<S> observer)

Adds an Observer to the list of observers.

Parameters:

observer - Observer to be added.

removeObserver

public void removeObserver(Observer<S> observer)

Removes an Observer from the list of observers.

Parameters:

observer - Observer to be removed.

updateObservers

public void updateObservers()

Calls the update() method for each observer attached to this object. This method suppresses the unchecked cast because type S is always a subtype of Observable with the generic type also being S, and the value of 'this' will also be a subtype of Observable with the generic type also being S, so the cast is safe.