com.deltax.util.listener
Class BaseSignalSource

java.lang.Object
  com.deltax.util.listener.BaseSignalSource

All Implemented Interfaces:

SignalSource

Direct Known Subclasses:

TSignalSource

public abstract class BaseSignalSource

extends java.lang.Object

implements SignalSource

A base implementation of SignalSource. The notify(Signal) and notifyException(ExceptionSignal) methods are protected.

Version:

1.0

Author:

Cristiano Sadun

Field Summary

protected ListenerSupport

ls The listener support object

Constructor Summary

protected

BaseSignalSource() Initialize the listener support object.

Method Summary

void	addListener(Listener listener) Allow source clients to add listeners.
int	countListeners() Return the number of registered listeners.
boolean	isRegistered(Listener listener) Return true if the given object is registered as a listener.
protected void	notify(Signal signal) Notify a signal to the listners.
protected void	notifyException(ExceptionSignal exceptionsignal) Notify a exception signal to the listners.
void	removeAllListeners()
void	removeListener(Listener listener) Allow source clients to remove listeners.
boolean	supportsExceptionSignals() Always return true, since this implementation does support exception signals.

Methods inherited from class java.lang.Object

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

Field Detail

ls

protected ListenerSupport ls

The listener support object

Constructor Detail

BaseSignalSource

protected BaseSignalSource()

Initialize the listener support object.

Method Detail

addListener

public void addListener(Listener listener)

Allow source clients to add listeners.

Parameters:

listener - the listener to add.

isRegistered

public boolean isRegistered(Listener listener)

Return true if the given object is registered as a listener.

Parameters:

listener - the listner to check

Returns:

true if the given object is registered as a listener, else false.

notify

protected void notify(Signal signal)

Notify a signal to the listners.

Parameters:

signal - the signal to be notified.

notifyException

protected void notifyException(ExceptionSignal exceptionsignal)

Notify a exception signal to the listners.

countListeners

public int countListeners()

Return the number of registered listeners.

Returns:

the number of registered listeners.

removeListener

public void removeListener(Listener listener)

Allow source clients to remove listeners.

Parameters:

listener - the listener to remove.

removeAllListeners

public void removeAllListeners()

supportsExceptionSignals

public boolean supportsExceptionSignals()

Always return true, since this implementation does support exception signals.

Specified by:

supportsExceptionSignals in interface SignalSource

Returns:

true