So I have designed the following solution:
1. New interface is created:
interface UndoableActorXml extends ActorXml
{
public XmlAction getUndoAction()
}
2. public void ActionFactory.executeAction(UndoableActorXml action)and
ActionHandler.executeAction(UndoableActorXml action) are declared and
implemented.
The ActionFactory.executeAction provides that the UndoHandler is the
last handler to be called.
UndoHandler.executeAction obtaines the undo - action ActionPair by
calling the getUndoAction() and creates the ActionPair.
Your comments are welcome before I start to implement.
Dimitry
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