History for EventCode

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<pre>

class Event:
    """An abstraction for events."""

    def __init__(self, aReason, aCallback):
	"""Construct the instance."""

	self.__reason = aReason
	self.__callback = aCallback
        return

    def getReason(self):
	"""Returns the reason that the event is interested in."""

	return self.__reason

    def getCallback(self):
	"""Returns the method to invoke for the event."""

	return self.__callback

    def execute(self, aReason):
	"""Execute the event for the given model."""

	self.getCallback().execute(aReason)
        return

</pre>
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