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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2068) fix reverseStringFilter for unicode 4.0
Date Sun, 22 Nov 2009 21:08:39 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Simon Willnauer updated LUCENE-2068:
------------------------------------

    Attachment: LUCENE_2068.patch

added a CHANGES.txt entry. Will commit soon.

> fix reverseStringFilter for unicode 4.0
> ---------------------------------------
>
>                 Key: LUCENE-2068
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2068
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: contrib/analyzers
>            Reporter: Robert Muir
>            Assignee: Simon Willnauer
>            Priority: Minor
>             Fix For: 3.1
>
>         Attachments: LUCENE-2068.patch, LUCENE-2068.patch, LUCENE_2068.patch, LUCENE_2068.patch,
LUCENE_2068.patch
>
>
> ReverseStringFilter is not aware of supplementary characters: when it reverses it will
create unpaired surrogates, which will be replaced by U+FFFD by the indexer (but not at query
time).
> The wrong words will conflate to each other, and the right words won't match, basically
the whole thing falls apart.
> This patch implements in-place reverse with the algorithm from apache harmony AbstractStringBuilder.reverse0()

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