advice please

From: Noah Roberts (nroberts_at_dontemailme.invalid)
Date: 08/13/04 

Date: Fri, 13 Aug 2004 13:03:00 -0700

The problem: Implement a protocol that contains multiple "modes" where
commands and events cause the system to enter a specific mode in which
different sets of commands are available. Some commands are available
in any mode, others result in an error saying disallowed. Some commands
result in different things depending on the mode we are in.

I am thinking that mode is a state and so that pattern fits. I also
have commands parsing themselves and returning command subclasses based
on input (prototype). What I am working on now is who should know more,
the mode or the command. Should commands query the mode and dissalow
themselves, or should the mode querry the command and dissalow it?
Should I generalize the mode interface so that the command can perform
operations or should I have the mode query the command for data
(arguments) and perform the operations? Is there another option I am
not thinking of? 

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