org.jquantlib.quotes

Class Quote

java.lang.Object

org.jquantlib.quotes.Quote

All Implemented Interfaces:

Observable

Direct Known Subclasses:

SimpleQuote

public abstract class Quote
extends java.lang.Object
implements Observable

Purely virtual base class for market observables

Constructor Summary

Constructors

Constructor and Description
Quote()

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.
void	deleteObserver(Observer observer) Detaches a previously attached observer to the observable.
void	deleteObservers() Detaches all previously attached observer to the observable.
java.util.List<Observer>	getObservers() Returns list of observers registered with the Observable.
abstract boolean	isValid()
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.
abstract double	value()

Methods inherited from class java.lang.Object

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

Constructor Detail

Quote

public Quote()

Method Detail

value

public abstract double value()

Returns:

the current value

isValid

public abstract boolean isValid()

Returns:

true if the Quote holds a valid value

addObserver

public 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 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 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 void notifyObservers()

Description copied from interface: Observable

Notifies all attached observers about changes in the observable.

Specified by:

notifyObservers in interface Observable

notifyObservers

public 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 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 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