org.jquantlib.quotes
Class Handle.Link

java.lang.Object
  org.jquantlib.quotes.Handle.Link

All Implemented Interfaces:

Observable, Observer

Enclosing class:

Handle<T extends Observable>

private class Handle.Link
extends java.lang.Object
implements Observable, Observer

Field Summary

private static java.lang.String	EMPTY_HANDLE
private boolean	isObserver
T	observable

Constructor Summary

Handle.Link(T observable, boolean isObserver)

Method Summary

void	addObserver(Observer observer) Attaches a observer to the Observable.
int	countObservers() Counts how many Observers were attached to this class.
void	deleteObserver(Observer observer) Detaches a previously attached observer to the observable.
void	deleteObservers() Detaches all previously attached observer to the observable.
T	getLink()
java.util.List<Observer>	getObservers() Returns list of observers registered with the Observable.
boolean	isEmpty()
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.
void	setLink(T observable, boolean isObserver)
void	update(Observable o, java.lang.Object arg) This method is called whenever the observed object is changed.

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_HANDLE

private static final java.lang.String EMPTY_HANDLE

See Also:

Constant Field Values

observable

public T extends Observable observable

isObserver

private boolean isObserver

Constructor Detail

Handle.Link

public Handle.Link(T observable,
                   boolean isObserver)

Method Detail

isEmpty

public final boolean isEmpty()

getLink

public final T getLink()

setLink

public final void setLink(T observable,
                          boolean isObserver)

update

public final void update(Observable o,
                         java.lang.Object arg)

Description copied from interface: Observer

This method is called whenever the observed object is changed.

Specified by:

update in interface Observer

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