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https://issues.apache.org/jira/browse/COLLECTIONS-275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12541034
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Stephen Colebourne commented on COLLECTIONS-275:
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This could not be implemented. The Collection and Map interfaces cannot be
implemented by the same class due to to clashing return types on remove(Object)
> IndexedCollection would be a useful addition to Commons Collections
> -------------------------------------------------------------------
>
> Key: COLLECTIONS-275
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-275
> Project: Commons Collections
> Issue Type: New Feature
> Components: Collection
> Reporter: Stephen Kestle
> Fix For: Generics
>
>
> I propose that an IndexedCollection is added, which has the following
> properties
> * IndexedCollection<K,C> implements Collection<C>, Map<K,C>
> * Contains a Transformer<C,K> for determining the keys
> * Presents as an unmodifiableMap (all manipulation must be done through the
> collection)
> * It will need constructors for unique indexes (Map) and non-unique
> (Map<K,Collection<V>> / MultiMap).
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