[jira] Commented: (COLLECTIONS-301) Provide SingleValueMap

["Henri Yandell (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/COLLECTIONS-301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12610721#action_12610721 ] 

Henri Yandell commented on COLLECTIONS-301:
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A normal map would also contain only one copy of that value as it would be String interned. The same would hold for other primitive wrapper classes - the JVM often ensures that they are the same Object instance.


> Provide SingleValueMap
> ----------------------
>
>                 Key: COLLECTIONS-301
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-301
>             Project: Commons Collections
>          Issue Type: New Feature
>          Components: Map
>    Affects Versions: 3.2
>            Reporter: Michael
>
> I miss an efficient implementation of a SingleValueMap.
> The idea goes as follows:
> Map<String, String> map = new SingleValueMap<String, String>();
> map.put("hello","greeting");
> map.put("hola","greeting");
> map.put("hallo",greeting");
> a normal map would now hold three copies of "greeting". A SingleValueMap would contain only one copy of this value. All keys would map to one copy, identically to a N:1 relaton.

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