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From "Thomas Morton (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1297) Allow other string distance measures in spellchecker
Date Sun, 15 Jun 2008 12:46:45 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12605134#action_12605134
] 

Thomas Morton commented on LUCENE-1297:
---------------------------------------

Hi,
   This code used to be in the SpellChecker itself.  It just converts the int from the Levenshtein
into a value between 0 and 1.      1 being identical, 0 being maximally different.  This return
value is part of the StringDistance interface and different methods compute this value differently
so it's necessary to compute it on a per distance measure basis.   

Thanks...Tom

> Allow other string distance measures in spellchecker
> ----------------------------------------------------
>
>                 Key: LUCENE-1297
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1297
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: contrib/spellchecker
>    Affects Versions: 2.4
>         Environment: n/a
>            Reporter: Thomas Morton
>            Assignee: Otis Gospodnetic
>            Priority: Minor
>             Fix For: 2.4
>
>         Attachments: LUCENE-1297.patch, LUCENE-1297.patch
>
>
> Updated spelling code to allow for other string distance measures to be used.
> Created StringDistance interface.
> Modified existing Levenshtein distance measure to implement interface (and renamed class).
> Verified that change to Levenshtein distance didn't impact runtime performance.
> Implemented Jaro/Winkler distance metric
> Modified SpellChecker to take distacne measure as in constructor or in set method and
to use interface when calling.

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