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Posted to issues@commons.apache.org by "Thomas Neidhart (JIRA)" <ji...@apache.org> on 2015/11/27 22:48:12 UTC

[jira] [Closed] (COLLECTIONS-552) Add an EquatorMap

     [ https://issues.apache.org/jira/browse/COLLECTIONS-552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thomas Neidhart closed COLLECTIONS-552.
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> Add an EquatorMap
> -----------------
>
>                 Key: COLLECTIONS-552
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-552
>             Project: Commons Collections
>          Issue Type: New Feature
>    Affects Versions: 4.0
>            Reporter: Thomas Neidhart
>
> An EquatorMap would use an Equator to compute the hashCode and make equality checks for the keys. Sometimes there is the use case to put objects into a map but their equals/hashCode implementation does not support that or one needs a custom version. The usual solution is to put the object in some kind of wrapper, but this requires additional memory.
> By providing an Equator, one can create custom maps quite easily. The implementation could be similar to the previous IdentityMap.



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