[jira] [Resolved] (COLLECTIONS-275) IndexedCollection would be a useful addition to Commons Collections

["Thomas Neidhart (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/COLLECTIONS-275?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thomas Neidhart resolved COLLECTIONS-275.
-----------------------------------------

    Resolution: Fixed

Finished the existing implementation in r1451883:

 * support of non-unique keys via a MultiValueMap
 * added flag uniqueIndex
 * added new static factory method nonUniqueIndexedCollection
 * fixes unit tests
 * added values(K) method to retrieve all values mapped to a key
 * get(Object) will return the first value in case of a non-unique index

To simplify the code, always a MultiMap is used, but it may be more efficient to create a separate UniqueIndexedCollection class which uses a Map internally.
                
> 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
>            Assignee: Stephen Kestle
>             Fix For: 4.0
>
>
> 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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