net.wimpi.modbus.util

Class Observable

java.lang.Object

net.wimpi.modbus.util.Observable

Direct Known Subclasses:

ObservableDigitalOut, ObservableRegister

public class Observable
extends Object

A cleanroom implementation of the Observable pattern.

Version:

1.2

Author:

Dieter Wimberger (wimpi)

Constructor Summary

Constructors

Constructor and Description
Observable() Constructs a new Observable instance.

Method Summary

Modifier and Type	Method and Description
void	addObserver(Observer o) Adds an observer instance if it is not already in the set of observers for this Observable.
int	getObserverCount() Gets observer count.
void	notifyObservers(Object arg) Notifies all observer instances in the set of observers of this Observable.
void	removeObserver(Observer o) Removes an observer instance from the set of observers of this Observable.
void	removeObservers() Removes all observer instances from the set of observers of this Observable.

Methods inherited from class java.lang.Object

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

Constructor Detail

Observable

public Observable()

Constructs a new Observable instance.

Method Detail

getObserverCount

public int getObserverCount()

Gets observer count.

Returns:

the observer count

addObserver

public void addObserver(Observer o)

Adds an observer instance if it is not already in the set of observers for this Observable.

Parameters:

o - an observer instance to be added.

removeObserver

public void removeObserver(Observer o)

Removes an observer instance from the set of observers of this Observable.

Parameters:

o - an observer instance to be removed.

removeObservers

public void removeObservers()

Removes all observer instances from the set of observers of this Observable.

notifyObservers

public void notifyObservers(Object arg)

Notifies all observer instances in the set of observers of this Observable.

Parameters:

arg - an arbitrary argument to be passed.