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Posted to issues@commons.apache.org by "Lluís Martínez (JIRA)" <ji...@apache.org> on 2008/12/24 00:32:44 UTC
[jira] Created: (COLLECTIONS-308) CollectionUtils.transform fails
when collection is HashMap$Values
CollectionUtils.transform fails when collection is HashMap$Values
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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((Collection)values, this);
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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[jira] Closed: (COLLECTIONS-308) CollectionUtils.transform fails
when collection is HashMap$Values
Posted by "Lluís Martínez (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COLLECTIONS-308?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lluís Martínez closed COLLECTIONS-308.
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Resolution: Won't Fix
I agree with Stephen's explanation, proceeding to close.
James: I need the map updated as well. I will iterate the keyset, get the value, transform and put.
Thanks for your comments.
> CollectionUtils.transform fails when collection is HashMap$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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[jira] Updated: (COLLECTIONS-308) CollectionUtils.transform fails
when collection is HashMap$Values
Posted by "Lluís Martínez (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COLLECTIONS-308?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lluís Martínez updated COLLECTIONS-308:
---------------------------------------
Description:
I'm trying to apply a transformation to all values in a map :
Collection values = map.values();
CollectionUtils.transform(values, transformer);
Gives a java.lang.UnsupportedOperationException in CollectionUtils line 439.
According to Javadoc the method values of Hashmap "does not support the add or addAll operations.".
was:
I'm trying to apply a transformation to all values in a map :
Collection values = map.values();
CollectionUtils.transform((Collection)values, this);
Gives a java.lang.UnsupportedOperationException in CollectionUtils line 439.
According to Javadoc the method values of Hashmap "does not support the add or addAll operations.".
> CollectionUtils.transform fails when collection is HashMap$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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[jira] Commented: (COLLECTIONS-308) CollectionUtils.transform fails
when collection is HashMap$Values
Posted by "James Carman (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COLLECTIONS-308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12659012#action_12659012 ]
James Carman commented on COLLECTIONS-308:
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Do you need the transformation to be visible via the map? Or, are you just looking to take the values from the map, transform them in some way, and then do something with them? If so, then try:
Collection values = new HashSet(map.values());
and play around with that values collection. Of course, you can use whatever type of collection you wish (LinkedList, ArrayList, TreeSet, etc.).
> CollectionUtils.transform fails when collection is HashMap$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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[jira] Commented: (COLLECTIONS-308) CollectionUtils.transform fails
when collection is HashMap$Values
Posted by "Stephen Colebourne (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COLLECTIONS-308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12659074#action_12659074 ]
Stephen Colebourne commented on COLLECTIONS-308:
------------------------------------------------
There is no way to 'fix' this in commons-collections - its the nature of transform() to alter the input collection.
The only change to make is to add some javadoc.
> CollectionUtils.transform fails when collection is HashMap$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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You can reply to this email to add a comment to the issue online.