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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2069) fix LowerCaseFilter for unicode 4.0
Date Wed, 25 Nov 2009 12:34:39 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2069?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Simon Willnauer updated LUCENE-2069:
------------------------------------

    Attachment: LUCENE-2069.patch

I revised the patch and fixed some issues:
- replaced real characters in tests
- extended tests to boundaries
- Removed "code duplication" in LowercaseFilter

the latter is the most important issue. I figured that if we implement a factory with the
basic codePointAt method based on a version we can implement the most of the algorithms /
methods just by obtaining the version correspondent instance of CharacterUtils (new class
I introduced) What this class does is pretty simple - if version >= 3.1 it delegates to
the Character correspondent while for earlier versions it convert a character to a codepoint
without checking the for high surrogates. Once we have done this conversion we can simply
use all the Character.*(int) methods as they are.



> fix LowerCaseFilter for unicode 4.0
> -----------------------------------
>
>                 Key: LUCENE-2069
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2069
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Analysis
>            Reporter: Robert Muir
>            Priority: Minor
>             Fix For: 3.1
>
>         Attachments: LUCENE-2069.patch, LUCENE-2069.patch, LUCENE-2069.patch, LUCENE-2069.patch
>
>
> lowercase suppl. characters correctly. 
> this only fixes the filter, the LowerCaseTokenizer is part of a more complex issue (CharTokenizer)

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