org.extex.interpreter.observer.start
Class StartObserverList

java.lang.Object
  org.extex.interpreter.observer.start.StartObserverList

All Implemented Interfaces:

StartObserver

public final class StartObserverList
extends java.lang.Object
implements StartObserver

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

Version:

$Revision: 4728 $

Author:

Gerd Neugebauer

Constructor Summary

StartObserverList()

Method Summary

void	add(StartObserver observer) Add an observer to the list.
static StartObserver	register(StartObserver list, StartObserver observer) Take a list and add an observer.
void	update(Interpreter interpreter) Invoke all observers on the list to inform them of the start operation.

Methods inherited from class java.lang.Object

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

Constructor Detail

StartObserverList

public StartObserverList()

Method Detail

register

public static StartObserver register(StartObserver list,
                                     StartObserver 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(StartObserver observer)

Add an observer to the list.

Parameters:

observer - the observer to add to the list

update

public void update(Interpreter interpreter)
            throws HelpingException

Invoke all observers on the list to inform them of the start operation. This method is meant to be invoked just after the start has occurred.

Specified by:

update in interface StartObserver

Parameters:

interpreter - the interpreter to be started

Throws:

HelpingException - in case of an error

See Also:

StartObserver.update( org.extex.interpreter.Interpreter)