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Subject: Re: [collections] CaseInsensitiveHashMap
From: Janek Bogucki <yan@studylink.com>
To: Jakarta Commons Developers List <commons-dev@jakarta.apache.org>
In-Reply-To: <3FC37742.9090400@steitz.com>
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	<3FC37742.9090400@steitz.com>
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Date: 25 Nov 2003 16:22:52 -0500
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On Tue, 2003-11-25 at 10:37, Phil Steitz wrote:
> Thinking about this some more, the semantics of keySet() would be 
> difficult with "CompositeMap" approach that I have suggested above.  We 
> would either have to require that T be idempotent - i.e., T(T(x)) = T(x) 
> or have the user supply a (partial) inverse transformer to return *a* 
> pre-image for each transformed key.
> 
> Phil

Not quite sure if I understood your point entirely but it would not be
possible to supply an inverse transformation for the lowercase operation
because it is a many to one function. Perhaps you covered this with the
word 'partial'  but I don't see what you mean by that. What's a partial
inverse transformer?

-Janek

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