org.jquantlib.quotes

Class Handle<T extends Observable>

java.lang.Object

org.jquantlib.quotes.Handle<T>

All Implemented Interfaces:

Observable

Direct Known Subclasses:

RelinkableHandle

public class Handle<T extends Observable>
extends java.lang.Object
implements Observable

Shared handle to an observable

All copies of an instance of this class refer to the same observable by means of a relinkable weak reference. When such pointer is relinked to another observable, the change will be propagated to all the copies.

Constructor Summary

Constructors

Constructor and Description
Handle()
Handle(T observable)
Handle(T observable, boolean registerAsObserver)

Method Summary

Modifier and Type	Method and Description
void	addObserver(Observer observer) Attaches a observer to the Observable.
int	countObservers() Counts how many Observers were attached to this class.
T	currentLink()
void	deleteObserver(Observer observer) Detaches a previously attached observer to the observable.
void	deleteObservers() Detaches all previously attached observer to the observable.
boolean	empty()
java.util.List<Observer>	getObservers() Returns list of observers registered with the Observable.
void	linkTo(T observable)
void	linkTo(T observable, boolean registerAsObserver)
void	notifyObservers() Notifies all attached observers about changes in the observable.
void	notifyObservers(java.lang.Object arg) Notifies all attached observers about changes in the observable.
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Handle

public Handle()

Handle

public Handle(T observable)

Handle

public Handle(T observable,
              boolean registerAsObserver)

Method Detail

empty

public final boolean empty()

currentLink

public final T currentLink()

linkTo

public void linkTo(T observable)

linkTo

public void linkTo(T observable,
                   boolean registerAsObserver)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

addObserver

public final void addObserver(Observer observer)

Description copied from interface: Observable

Attaches a observer to the Observable. After attachment the observer gets informed about changes in the Observable.

Specified by:

addObserver in interface Observable

Parameters:

observer - The observer to attach to the observable

countObservers

public final int countObservers()

Description copied from interface: Observable

Counts how many Observers were attached to this class.

Specified by:

countObservers in interface Observable

Returns:

the number of Observers

See Also:

Observer

deleteObserver

public final void deleteObserver(Observer observer)

Description copied from interface: Observable

Detaches a previously attached observer to the observable. After detachment the observer does no longer receive change notifications from the observable.

Specified by:

deleteObserver in interface Observable

Parameters:

observer - The observer to detach from the observable

notifyObservers

public final void notifyObservers()

Description copied from interface: Observable

Notifies all attached observers about changes in the observable.

Specified by:

notifyObservers in interface Observable

notifyObservers

public final void notifyObservers(java.lang.Object arg)

Description copied from interface: Observable

Notifies all attached observers about changes in the observable.

Specified by:

notifyObservers in interface Observable

Parameters:

arg - an arbitrary Object to be passed to the Observer

deleteObservers

public final void deleteObservers()

Description copied from interface: Observable

Detaches all previously attached observer to the observable. After detachment observers do not longer receive change notifications from the observable.

Specified by:

deleteObservers in interface Observable

getObservers

public final java.util.List<Observer> getObservers()

Description copied from interface: Observable

Returns list of observers registered with the Observable. List returned is unmodifiable list.

Specified by:

getObservers in interface Observable

Returns:

list of observers