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https://issues.apache.org/jira/browse/LUCENE-2102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784472#action_12784472
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Uwe Schindler commented on LUCENE-2102:
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One othe possibility to resolve the problem in a completely different way: You
could wrap a MappingCharFilter on top of the input reader in Analyzer and just
add a replacement for this one char:
[http://lucene.apache.org/java/3_0_0/api/all/org/apache/lucene/analysis/MappingCharFilter.html]
This would be a very easy fix without code duplication. You just change the
input before tokenization. And its already in Lucene core, just plug it into
the analyzer's tokenStream() or reusableTokenStream() method as a wrapper
around the Reader param.
This would be very easy also for the other analyzers having problem with seldom
chars. It can also be used to remove chars at all or replace them by longer
sequences like รค -> ae (for german).
> LowerCaseFilter for Turkish language
> ------------------------------------
>
> Key: LUCENE-2102
> URL: https://issues.apache.org/jira/browse/LUCENE-2102
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Analysis
> Affects Versions: 3.0
> Reporter: Ahmet Arslan
> Assignee: Robert Muir
> Priority: Minor
> Fix For: 3.1
>
> Attachments: LUCENE-2102.patch, LUCENE-2102.patch, LUCENE-2102.patch
>
>
> java.lang.Character.toLowerCase() converts 'I' to 'i' however in Turkish
> alphabet lowercase of 'I' is not 'i'. It is LATIN SMALL LETTER DOTLESS I.
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