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https://issues.apache.org/jira/browse/COLLECTIONS-607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17069161#comment-17069161
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Chen Guoping commented on COLLECTIONS-607:
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I had provide a commit on GitHub:
https://github.com/dota17/commons-collections/commit/a1b45dba11c5542de2494a2ec2d4b21dc7b39c7b
Can you help to review it ? Thanks
> Adding a hash table based BidiMap
> ---------------------------------
>
> Key: COLLECTIONS-607
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-607
> Project: Commons Collections
> Issue Type: New Feature
> Components: BidiMap
> Reporter: Rodion Efremov
> Priority: Minor
> Labels: features, newbie
> Original Estimate: 336h
> Remaining Estimate: 336h
>
> In the class Javadoc of
> http://svn.apache.org/viewvc/commons/proper/collections/trunk/src/main/java/org/apache/commons/collections4/bidimap/DualHashBidiMap.java?view=markup
>
> there is a mention that Collections would welcome a direct hash-based
> implementation of BidiMap interface.
> I am working on such; my source is available at
> https://github.com/coderodde/BidirectionalHashMap
> At this point it does not adhere to style/interfaces of Commons Collections
> (such as implementing the BidiMap interface), yet I believe that is a matter
> of simple rewrite.
> Currently, it represents the "collision chains" as AVL-trees, thus
> guaranteeing O(log n) access/modification even on poor hash functions. If
> that is not required, rewriting would be trivial as well.
> I have several questions, but I have to start from the most important: is
> there any acute need for such a data structure?
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