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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-460) hashCode improvements
Date Sun, 30 Oct 2005 15:08:55 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-460?page=comments#action_12356326 ] 

Yonik Seeley commented on LUCENE-460:
-------------------------------------

Oh, and preserve entropy by using reversible integer hash functions (see the previous link).
 -  key ^= (key << a) | (key >>> b); for a,b in (17,16) (16,17) (14,19) (19,14)
(13,20) (20,13) (10,23) (23,10) (8,25) (25,8)
 - multiply by an odd
 - addition
 - xor
 - rotates

> hashCode improvements
> ---------------------
>
>          Key: LUCENE-460
>          URL: http://issues.apache.org/jira/browse/LUCENE-460
>      Project: Lucene - Java
>         Type: Improvement
>   Components: Search
>     Versions: CVS Nightly - Specify date in submission
>     Reporter: Yonik Seeley
>     Priority: Minor
>      Fix For: CVS Nightly - Specify date in submission

>
> It would be nice for all Query classes to implement hashCode and equals to enable them
to be used as keys when caching.

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