[jira] [Closed] (COLLECTIONS-504) CompositeMap should support compositing of maps of derived types

["Peter Cooper Jr. (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/COLLECTIONS-504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Peter Cooper Jr. closed COLLECTIONS-504.
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    Resolution: Invalid

> CompositeMap should support compositing of maps of derived types
> ----------------------------------------------------------------
>
>                 Key: COLLECTIONS-504
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-504
>             Project: Commons Collections
>          Issue Type: Bug
>          Components: Map
>    Affects Versions: 4.0
>            Reporter: Peter Cooper Jr.
>            Priority: Minor
>
> I'm attempting to composite two maps, one of which is a {{Map<String, String>}} and the other of which is a {{Map<String, Object>}}. I would have expected that I could composite them into a {{CompositeMap<String, Object>}}, but the constructors of CompositeMap expect all of the maps being composited to have exactly the same type arguments.
> That is, I think the constructors should take arguments of {{Map<? extends K, ? extends V>}} instead of what they currently have of {{Map<K, V>}}, much like most collection methods, since there shouldn't be a problem accepting type arguments that are subtypes of the composite map types.
> Thanks!



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