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From "Matt Benson (JIRA)" <>
Subject [jira] [Commented] (COLLECTIONS-333) Generic versions of Transformed* classes
Date Wed, 20 Jul 2011 19:34:58 GMT


Matt Benson commented on COLLECTIONS-333:

That is probably not going to happen.  See the Commons sandbox [functor] component, specifically
the UnaryFunctor class.  If you try and like [functor], tell the dev list so and push for
its promotion to proper and release!

> Generic versions of Transformed* classes
> ----------------------------------------
>                 Key: COLLECTIONS-333
>                 URL:
>             Project: Commons Collections
>          Issue Type: Improvement
>          Components: Bag, Collection, List, Set
>    Affects Versions: 3.2
>         Environment: OS X
>            Reporter: Edwin Tellman
>            Assignee: Stephen Kestle
>            Priority: Minor
>             Fix For: 4.0-beta-1
> The generic version of Transformer required the input and output types to be identical.
 This seemed to me to reduce the usefulness of transformed collections, as transforming one
type into another seems like it would be a fairly common operation.  I'm not sure how to fix
this, however, as it also doesn't seem feasible to have a generic TransformedCollection with
different input and output types that implements Collection<E>.  Anyway, this patch
de-generifies TransformedCollection, which also fixes some compilation problems.  Please disregard
this change if you disagree and have a better solution.
> Cloned from COLLECTIONS-243, where there is much Transformed* discussion.

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