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Subject [collections][lang] Predicate etc impls, was Re: commons-collections: New code contribution.
Date Thu, 05 Dec 2002 11:47:06 GMT
[please note the square brackets in the title ;-)]

This has been a hot topic before in commons. The current position is that there is a large
body of code such as what you suggest already coded. It resides in [lang]s functor package
(not released yet). However, the classes use a different Predicate interface from [collections],
which needs to be resolved.

The plan is to make [collections] depend on [lang] and deprecate the Predicate etc. interfaces
in [collections].

Can you take a look at the [lang] code, and see if you have any Predicate/Transformer/Executor
implementations which are not in the functor package. If so, I'd like to add to the [lang]


>  from:    Tom Drake <>
> I'm new to this list, but have worked with the commons-collections package
> for quite a while.
> I recently came off a project that implemented a simple but powerful rules
> engine
> based on three interfaces that were essentially identical to the Predicate,
> Closure, and Transformer
> interfaces. I've built a number of concrete implementations of these commons
> interfaces that are generally
> useful (e.g. AndPredicate, OrPredicate, TransformerChain, etc...) I'd like
> to contribute this code
> along with corresponding Junit tests. Is anyone on this list interested in
> taking a look at the code?
> I can email a zip file containing all my sources to any interested
> committers.
> Thanks,
> Tom Drake
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