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From "Pascal Schumacher (JIRA)" <>
Subject [jira] [Resolved] (LANG-1269) Wrong name or result of StringUtils::getJaroWinklerDistance
Date Fri, 28 Oct 2016 17:23:58 GMT


Pascal Schumacher resolved LANG-1269.
       Resolution: Fixed
         Assignee: Pascal Schumacher  (was: Bruno P. Kinoshita)
    Fix Version/s: 3.6

> Wrong name or result of StringUtils::getJaroWinklerDistance
> -----------------------------------------------------------
>                 Key: LANG-1269
>                 URL:
>             Project: Commons Lang
>          Issue Type: Bug
>    Affects Versions: 3.3, 3.4
>            Reporter: Jan Martin Keil
>            Assignee: Pascal Schumacher
>            Priority: Minor
>             Fix For: 3.6
> The name of the method StringUtils::getJaroWinklerDistance is misleading.
> Currently for equal strings {{1}} is returned, for completely different strings {{0}}
is returned. That is a measure of similarity, not of a distance. A distance must be {{0}}
for equal strings. I read on the issues LANG-591 and LANG-944, that it was decided to have
a similar name to StringUtils::getLevenshteinDistance, but that requires also the change of
the methods result.
> Could you please (1) rename the method to StringUtils::getJaroWinklerSimilarity or (2)
change the method to return {{1 - currentResult}}?
> First option has the disadvantage to lose the similar naming of the similar methods,
second option implies the risk to unnoticed introduce bugs in depending code. So I think it
is preferable to use the first option.

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