[Reality] Containment - barriers to implementation

[Christopher Armstrong]

exarkun at divmod.com wrote:
>     class Look(TargetAction):
>         def doAction(self):
>             ....
>             if usingXRayVision:
>                 c = collect(self.target, IDescribable,
>                             # Only implementors that are lead can actually be seen
>                             lambda o: IMaterial(o).type == 'lead',
>                             # Only collectors that are lead cannot be seen through
>                             lambda o: IMaterial(o).type != 'lead',
>                             2)
>             else:
>                 c = collect(self.target, IDescribable,
>                             # All implementors are visible
>                             lambda o: True,
>                             # Open and transparent containers can be seen through
>                             lambda o: not ICloseable(o).closed or IMaterial(o).type == 'glass'
>                             2)

Hmm, the last bit kinda annoys me. Maybe we should allow the collectors 
to implement some of those 'blocking' semantics themselves ("Am I 
closed? If so, don't let things through") with the option for the 
criterion to override them?

-- 
  Twisted | Christopher Armstrong: International Man of Twistery
   Radix  |          Release Manager,  Twisted Project
---------+           http://radix.twistedmatrix.com/
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