[jira] [Updated] (LUCENE-2227) separate chararrayset interface from impl

["David Smiley (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-2227?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Smiley updated LUCENE-2227:
---------------------------------

    Fix Version/s:     (was: 4.7)
                   4.8

> separate chararrayset interface from impl
> -----------------------------------------
>
>                 Key: LUCENE-2227
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2227
>             Project: Lucene - Core
>          Issue Type: Task
>          Components: modules/analysis
>    Affects Versions: 3.0
>            Reporter: Robert Muir
>            Priority: Minor
>              Labels: dead
>             Fix For: 4.8
>
>
> CharArraySet should be abstract
> the hashing implementation currently being used should instead be called CharArrayHashSet
> currently our 'CharArrayHashSet' is hardcoded across Lucene, but others might want their own impl.
> For example, implementing CharArraySet as DFA with org.apache.lucene.util.automaton gives faster contains(char[], int, int) performance, as it can do a 'fast fail' and need not hash the entire string.
> This is useful as it speeds up indexing in StopFilter.
> I did not think this would be faster but i did benchmarks over and over with the reuters corpus, and it is, even with english text's wierd average word length of 5



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