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