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Posted to dev@commons.apache.org by "Stephen Smith (JIRA)" <ji...@apache.org> on 2007/03/18 14:07:09 UTC
[jira] Commented: (COLLECTIONS-243) Generic versions of Predicated,
Syncronized and Unmodifiable classes
[ https://issues.apache.org/jira/browse/COLLECTIONS-243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12481935 ]
Stephen Smith commented on COLLECTIONS-243:
-------------------------------------------
I agree with Stephen K that the Transformer<I, O> contract is incorrect - I'm currently genericising CollectionUtils and have to omit any changes to Transformer related methods due to compiler bustage.
Transformer<? super E, ? extends E> looks right to me.
> Generic versions of Predicated, Syncronized and Unmodifiable classes
> --------------------------------------------------------------------
>
> Key: COLLECTIONS-243
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-243
> Project: Commons Collections
> Issue Type: Improvement
> Components: Bag, Collection, List, Set
> Affects Versions: Generics
> Environment: OS X
> Reporter: Edwin Tellman
> Priority: Minor
> Fix For: Generics
>
> Attachments: collections_06_03_11.patch
>
>
> I added generics to some more classes and fixed some compilation problems.
> 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.
> The modified collection classes are:
> Bags: PredicatedSortedBag, AbstractBagDecorator, SynchronizedBag, UnmodifiableSortedBag, SynchronizedSortedBag, PredicatedBag
> Lists: PredicatedList, SynchronizedList
> Sets: PredicatedSortedSet, SynchronizedSortedSet, PredicatedSet, UnmodifiableSortedSet, SynchronizedSet
> Miscellaneous: PredicatedBuffer
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