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https://issues.apache.org/jira/browse/COLLECTIONS-479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15143246#comment-15143246
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Rodion Efremov commented on COLLECTIONS-479:
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Hello everybody!
I wasn't able to work on this one after all. However, I started today from
scratch and have a progress on counted AVL-tree: insert, lookup and deletion
implemented. Just lacks the actual counts needed for making it an order
statistic tree. Question: what interfaces should I implement? java.util.Set
seems like natural choice, but there might be more. What would be your opinion
on this one?
> An Order Statistic Tree
> -----------------------
>
> Key: COLLECTIONS-479
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-479
> Project: Commons Collections
> Issue Type: New Feature
> Reporter: Ajo Fod
> Priority: Minor
> Fix For: 4.x
>
> Attachments: COLLECTIONS-479.patch, NodeExistsException.java,
> RedBlackBST.java
>
>
> An order statistic tree http://en.wikipedia.org/wiki/Order_statistic_tree
> provides two useful properties. The ability to rank arbitrary keys relative
> to keys existing in the tree AND the ability to retrieve elements from the
> tree with the given rank.
> This can be used to find the percentile rank of a key for example.
> This functionality is not yet provided yet by any of the major libraries
> AFAIK.
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