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From robert burrell donkin <>
Subject Re: [general] lang scope?
Date Thu, 05 Dec 2002 19:50:07 GMT
On Thursday, December 5, 2002, at 06:35 PM, Tom Drake wrote:

> It sounds like I've jumped into a bit of a hornets nest.

this is actually pretty tame :)

but it's too late to jump of the frying pan...

> I was thinking this morning that such a move will run a high risk of
> creating a circular dependancy between [collections] and [lang][functor]. 
> It
> seems likely that functors would want to use collection objects and
> vice-versa. If I'm right about this, then all this code really belongs 
> under
> the same package.

(i don't have a deep understanding of the issues so this might be 
completely left field.)

i suppose that it's the implementations rather than the interfaces that 
will depend on collection objects.

this might point towards having a separate (possibly revamped) pattern 
component. the interfaces might live in lang and the implementations in 
pattern. pattern could depend on collection whereas collection could 
depend on lang.

- robert

> -----Original Message-----
> From: Rodney Waldhoff []
> Sent: Thursday, December 05, 2002 9:47 AM
> To: Jakarta Commons Developers List
> Subject: [general] lang scope? (was Re: [collections][lang] Predicate
> etc impls, was Re: commons-collections: New code contribution.)
> On Thu, 5 Dec 2002 wrote:
>> The plan is to make [collections] depend on [lang] and deprecate the
>> Predicate etc. interfaces in [collections].
> At the risk of becoming increasingly unpopular with the lang folks, for
> reasons similiar to those I enumerated in [1] (and others), I'm
> uncomfortable with moving Predicate et al to lang.  I'm having a lot of
> trouble seeing lang as meeting the "Each package must have a clearly
> defined purpose, scope, and API -- Do one thing well, and keep your
> contracts." criterion.
> Don't get me wrong, I think all of this is great stuff, but why does it
> all have to be in lang?  If it doesn't meet the common reuse principle, it
> should be in a different component.  The current (i.e., released) contents
> of o.a.c.lang, o.a.c.lang.builder, o.a.c.lang.enum and
> o.a.c.lang.exception seem reasonably coherent, but I don't think the
> either the functor or the reflection packages are a clean fit (with
> respect to the CRP, R/REP, etc.), either with each other or the other
> classes in lang.
> [1]
> <
> dev@jakarta.a
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