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From "Rodion Efremov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (COLLECTIONS-479) An Order Statistic Tree
Date Sat, 21 Dec 2013 13:02:10 GMT

     [ https://issues.apache.org/jira/browse/COLLECTIONS-479?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rodion Efremov updated COLLECTIONS-479:
---------------------------------------

    Attachment: COLLECTIONS-479.patch

The patch applies 2 files: {{OrderStatisticTree.java}} and its test file {{OrderStatisticTreeTest.java}}.

> 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
>         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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