org.extex.interpreter.observer.expand
Class ExpandObserverList

java.lang.Object
  org.extex.interpreter.observer.expand.ExpandObserverList

All Implemented Interfaces:

ExpandObserver

public final class ExpandObserverList
extends java.lang.Object
implements ExpandObserver

This class provides a type-safe list of observers for the expand event.

Version:

$Revision: 4770 $

Author:

Gerd Neugebauer

Constructor Summary

ExpandObserverList()

Method Summary

void	add(ExpandObserver observer) Add an observer to the list.
static ExpandObserver	register(ExpandObserver list, ExpandObserver observer) Take a list and add an observer.
void	update(Token token) Invoke all observers on the list to inform them of the token to be expanded.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpandObserverList

public ExpandObserverList()

Method Detail

register

public static ExpandObserver register(ExpandObserver list,
                                      ExpandObserver observer)

Take a list and add an observer. If the list is null then a new one is created.

Parameters:

list - the input list or null

observer - the observer to add

Returns:

the input list or a new one with the observer added

add

public void add(ExpandObserver observer)

Add an observer to the list.

Parameters:

observer - the observer to add to the list

update

public void update(Token token)

Invoke all observers on the list to inform them of the token to be expanded.

Specified by:

update in interface ExpandObserver

Parameters:

token - the token to be expanded