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https://issues.apache.org/jira/browse/COLLECTIONS-333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13068568#comment-13068568
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Michael Mogley commented on COLLECTIONS-333:
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Actually, I was going to raise an issue to have Transformer be made generic. It
should not be difficult to parametrize this interface using both a source and
target type, along the lines of Transformer<S,T>. The transform method would
then become:
T transform(S source)
The corresponding transformer classes could be parametrized in a similar way.
> Generic versions of Transformed* classes
> ----------------------------------------
>
> Key: COLLECTIONS-333
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-333
> 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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