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Dec 23, 2005, 8:29 AM
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[jira] Commented: (LUCENE-460) hashCode improvements
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[ http://issues.apache.org/jira/browse/LUCENE-460?page=comments#action_12361200 ]
Yonik Seeley commented on LUCENE-460:
-------------------------------------
Some people have asked where some of the magic constants come from in the hashCodes:
> python -c "import random;print hex(random.getrandbits(32))[:-1]"
> Just a way of making some things unique.... let me know if you have a
> better idea on that.
>
> So those constants are just random numbers. I thought about trying to pick magic numbers to maximize hamming distances, etc,
> but it's more work and more likely to mess things up if you get it wrong. getClass().hashCode() would also work, but it would be
> slower.
> 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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