com.tensegrity.generic.util
Class DefaultObservable

java.lang.Object
  com.tensegrity.generic.util.DefaultObservable

All Implemented Interfaces:

Observable

public class DefaultObservable

extends java.lang.Object

implements Observable

The class DefaultObservable is meant as a notification-delegator. It represents an observable object, or "data" in the model-view paradigm. An DefaultObservable object can have one or more observers. An observer may be any object that implements interface Observer.

Version:

$Id: DefaultObservable.java,v 1.16 2004/10/11 10:31:11 MichaelKegel Exp $

Author:

Stepan Rutz

See Also:

Observer

Constructor Summary

DefaultObservable()
Constructs a DefaultObservable with zero observers.

Method Summary

void	addObserver(Observer observer) Adds an observer to the internally managed list of observers of this observable.
void	clearChanged() Sets the state to unchanged.
void	deleteObserver(Observer observer) Deletes an observer from the internally managed list of observers of this observable.
void	deleteObservers() Deletes all of the observers registered with this observable.
static void	dumpAllObservers() Dumps all active observers to the System.err-stream.
java.util.Collection	getObservers() Returns a collection of the observers currently registered with this observable.
void	notifyObservers() Performs a notify on all registered observers, if the state has changed since the last notification.
void	notifyObservers(java.lang.Object arg) Performs a notify on all registered observers, if the state has changed since the last notification.
void	setChanged() Sets the state to changed.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultObservable

public DefaultObservable()

Constructs a DefaultObservable with zero observers.

Method Detail

addObserver

public void addObserver(Observer observer)

Description copied from interface: Observable

Adds an observer to the internally managed list of observers of this observable.

Specified by:

addObserver in interface Observable

Parameters:

observer - the observer to add to the internal list.

deleteObserver

public void deleteObserver(Observer observer)

Description copied from interface: Observable

Deletes an observer from the internally managed list of observers of this observable.

Specified by:

deleteObserver in interface Observable

Parameters:

observer - the observer to delete from the internal list.

notifyObservers

public void notifyObservers()

Description copied from interface: Observable

Performs a notify on all registered observers, if the state has changed since the last notification.

Specified by:

notifyObservers in interface Observable

See Also:

Observable.notifyObservers()

notifyObservers

public void notifyObservers(java.lang.Object arg)

Description copied from interface: Observable

Performs a notify on all registered observers, if the state has changed since the last notification.

Specified by:

notifyObservers in interface Observable

Parameters:

arg - additional argument to pass to the observers.

See Also:

Observable.notifyObservers(Object)

deleteObservers

public void deleteObservers()

Description copied from interface: Observable

Deletes all of the observers registered with this observable.

Specified by:

deleteObservers in interface Observable

See Also:

Observable.deleteObservers()

setChanged

public void setChanged()

Description copied from interface: Observable

Sets the state to changed. Affects the next notification.

Specified by:

setChanged in interface Observable

See Also:

Observable.setChanged()

clearChanged

public void clearChanged()

Description copied from interface: Observable

Sets the state to unchanged. Affects the next notification.

Specified by:

clearChanged in interface Observable

See Also:

Observable.clearChanged()

getObservers

public java.util.Collection getObservers()

Description copied from interface: Observable

Returns a collection of the observers currently registered with this observable.

Specified by:

getObservers in interface Observable

Returns:

collection of the observers.

See Also:

Observable.getObservers()

dumpAllObservers

public static final void dumpAllObservers()

Dumps all active observers to the System.err-stream.