com.isti.util
Class DataChgdListenerSupport

java.lang.Object
  com.isti.util.DataChgdListenerSupport

public class DataChgdListenerSupport

extends java.lang.Object

Class DataChgdListenerSupport is a support class for managing a list of 'DataChangedListener' objects. The methods in this class are thread safe.

Field Summary

protected java.lang.Object	invokeSourceObj Source object to be used when listener invoked.
protected java.util.ArrayList	listenersList List of 'DataChangedListener' objects.

Constructor Summary

DataChgdListenerSupport(java.lang.Object sourceObj)
Creates a support object for managing a list of 'DataChangedListener' objects.

Method Summary

void	addListener(DataChangedListener listenerObj) Adds a listener object to the list of listeners to be invoked when the 'fireListeners()' method is called.
boolean	containsListener(DataChangedListener listenerObj) Determines whether or not the given listener is contained in the list of listeners.
void	fireListeners() Invokes the listeners on the list.
void	removeListener(DataChangedListener listenerObj) Removes a listener object from the list of listeners.

Methods inherited from class java.lang.Object

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

Field Detail

invokeSourceObj

protected final java.lang.Object invokeSourceObj

Source object to be used when listener invoked.

listenersList

protected java.util.ArrayList listenersList

List of 'DataChangedListener' objects.

Constructor Detail

DataChgdListenerSupport

public DataChgdListenerSupport(java.lang.Object sourceObj)

Creates a support object for managing a list of 'DataChangedListener' objects.

Parameters:

sourceObj - source object to be passed along when a listener is invoked.

Method Detail

addListener

public void addListener(DataChangedListener listenerObj)

Adds a listener object to the list of listeners to be invoked when the 'fireListeners()' method is called.

Parameters:

listenerObj - 'DataChangedListener' object to add.

removeListener

public void removeListener(DataChangedListener listenerObj)

Removes a listener object from the list of listeners.

Parameters:

listenerObj - 'DataChangedListener' object to remove.

containsListener

public boolean containsListener(DataChangedListener listenerObj)

Determines whether or not the given listener is contained in the list of listeners.

Parameters:

listenerObj - 'DataChangedListener' object to look for.

Returns:

true if the given listener is contained in the list of listeners; false if not.

fireListeners

public void fireListeners()

Invokes the listeners on the list. The 'dataChanged()' method for each listener is called.