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From "Stephen Colebourne (JIRA)" <j...@apache.org>
Subject [jira] Commented: (COLLECTIONS-308) CollectionUtils.transform fails when collection is HashMap$Values
Date Wed, 24 Dec 2008 09:26:44 GMT

    [ https://issues.apache.org/jira/browse/COLLECTIONS-308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12659074#action_12659074
] 

Stephen Colebourne commented on COLLECTIONS-308:
------------------------------------------------

There is no way to 'fix' this in commons-collections - its the nature of transform() to alter
the input collection.

The only change to make is to add some javadoc.

> CollectionUtils.transform fails when collection is HashMap$Values
> -----------------------------------------------------------------
>
>                 Key: COLLECTIONS-308
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-308
>             Project: Commons Collections
>          Issue Type: Bug
>          Components: Collection
>    Affects Versions: 3.2
>         Environment: Ubuntu
>            Reporter: Lluís Martínez
>            Priority: Minor
>
> I'm trying to apply a transformation to all values in a map :
> 		Collection values = map.values();
> 		CollectionUtils.transform(values, transformer);
> Gives a java.lang.UnsupportedOperationException in CollectionUtils line 439.
> According to Javadoc the method values of Hashmap "does not support the add or addAll
operations.".

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