org.apache.fop.layoutmgr

Class ElementListObserver


public class ElementListObserver
extends java.lang.Object

This class is used to observe Knuth element lists generated within the layout managers. This is mainly used for the purpose of automated testing. This implementation here does nothing. Please see the subclass within the test code.

Nested Class Summary

static interface
ElementListObserver.Observer
Implement this interface to receive notifications on element lists.

Method Summary

static void
addObserver(ElementListObserver.Observer observer)
Adds a new Observer to the list.
static boolean
isObservationActive()
static void
observe(List elementList, String category, String id)
Notifies all registered observers about the element list.
static void
removeObserver(ElementListObserver.Observer observer)
Removes an Observer from the list.

Method Details

addObserver

public static void addObserver(ElementListObserver.Observer observer)
Adds a new Observer to the list.
Parameters:
observer - the observer implementation

isObservationActive

public static boolean isObservationActive()
Returns:
true if observation is active, i.e. Observers are registered.

observe

public static void observe(List elementList,
                           String category,
                           String id)
Notifies all registered observers about the element list.
Parameters:
elementList - the Knuth element list
category - the category for the element list (example: main, static-content, table-cell)
id - ID for the element list (may be null)

removeObserver

public static void removeObserver(ElementListObserver.Observer observer)
Removes an Observer from the list. This call simply returns if the observer was not on the list and does nothing.
Parameters:
observer - the observer to remove

Copyright 1999-2007 The Apache Software Foundation. All Rights Reserved.