de.alpharogroup.designpattern.observer

Class AbstractSubject<T,O extends Observer<T>>

java.lang.Object

de.alpharogroup.designpattern.observer.AbstractSubject<T,O>

Type Parameters:

T - the generic type of the observable.

O - the generic type of the observer

All Implemented Interfaces:

Subject<T,O>

Direct Known Subclasses:

ChatRoom

public abstract class AbstractSubject<T,O extends Observer<T>>
extends Object
implements Subject<T,O>

The Class AbstractSubject is an implementation from the interface Subject. This class encapsulates the observable and fires an update if the observable changes. The update informs all registered observers about the change of the observable.

Constructor Summary

Constructors

Constructor and Description
AbstractSubject() Default constructor for a new subject.
AbstractSubject(T observable) Constructor for a new subject with an observable.

Method Summary

Modifier and Type	Method and Description
void	addObserver(O observer) Adds the given observer.
void	addObservers(Collection<O> observers) Adds the given observers.
T	getObservable() Gets the observable.
void	removeObserver(O observer) Removes the given observer.
void	removeObservers(Collection<O> observers) Removes the given observers.
void	setObservable(T observable) Sets the observable.
void	updateObservers() Update observers.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractSubject

public AbstractSubject()

Default constructor for a new subject.

AbstractSubject

public AbstractSubject(T observable)

Constructor for a new subject with an observable.

Parameters:

observable - the observable

Method Detail

addObserver

public void addObserver(O observer)

Adds the given observer.

Specified by:

addObserver in interface Subject<T,O extends Observer<T>>

Parameters:

observer - the observer to be added.

addObservers

public void addObservers(Collection<O> observers)

Adds the given observers.

Specified by:

addObservers in interface Subject<T,O extends Observer<T>>

Parameters:

observers - the observers to be added.

getObservable

public T getObservable()

Gets the observable.

Specified by:

getObservable in interface Subject<T,O extends Observer<T>>

Returns:

the observable

removeObserver

public void removeObserver(O observer)

Removes the given observer.

Specified by:

removeObserver in interface Subject<T,O extends Observer<T>>

Parameters:

observer - the observer to be remove.

removeObservers

public void removeObservers(Collection<O> observers)

Removes the given observers.

Specified by:

removeObservers in interface Subject<T,O extends Observer<T>>

Parameters:

observers - the observers to be remove.

setObservable

public void setObservable(T observable)

Sets the observable.

Specified by:

setObservable in interface Subject<T,O extends Observer<T>>

Parameters:

observable - the new observable

updateObservers

public void updateObservers()

Update observers.

Specified by:

updateObservers in interface Subject<T,O extends Observer<T>>