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https://issues.apache.org/jira/browse/LUCENE-2102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784480#action_12784480
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Robert Muir commented on LUCENE-2102:
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bq. The patch's TurkishLowerCaseFilter is as unflexible as that. The idea is
just a replacement for the current patch (and it is even a little bit more
universal, because you can change the chars to map).
Uwe this is not true. With a tokenfilter, I can use Version that will apply the
logic i mentioned above:
bq. after finding a regular I (\u0049) we could search ahead for COMBINING DOT
ABOVE (ignoring any nonspacing marks and format and such along the way), and
handle this differently.
you cannot do this with mappingchar filter, or rather, you could, but there
would be millions of mappings for this one character. I could later patch this
filter with Version and some lookahead based on unicode properties if i wanted
to improve it.
> 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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