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Posted to dev@lucene.apache.org by "Uwe Schindler (JIRA)" <ji...@apache.org> on 2010/04/19 22:58:49 UTC
[jira] Resolved: (LUCENE-2404) Improve speed of ThaiWordFilter by
CharacterIterator, factor out LowerCasing and also fix some bugs (empty
tokens stop iteration)
[ https://issues.apache.org/jira/browse/LUCENE-2404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Uwe Schindler resolved LUCENE-2404.
-----------------------------------
Resolution: Fixed
Committed revisions: 935734 (Lucene) & 935739 (Solr)
> Improve speed of ThaiWordFilter by CharacterIterator, factor out LowerCasing and also fix some bugs (empty tokens stop iteration)
> ---------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-2404
> URL: https://issues.apache.org/jira/browse/LUCENE-2404
> Project: Lucene - Java
> Issue Type: Bug
> Components: contrib/analyzers
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 3.1
>
> Attachments: LUCENE-2404-2.patch, LUCENE-2404-2.patch, LUCENE-2404.patch, LUCENE-2404.patch
>
>
> The ThaiWordFilter creates new Strings out of term buffer before passing to The BreakIterator., But BreakIterator can take a CharacterIterator and directly process on it without buffer copying.
> As Java itsself does not provide a CharacterIterator implementation in java.text, we can use the javax.swing.text.Segment class, that operates on a char[] and is even reuseable! This class is very strange but it works and is in JDK 1.4+ and not deprecated.
> The filter also had a bug: It stopped iterating tokens when an empty token occurred. Also the lowercasing for non-thai words was removed and put into the Analyzer by adding LowerCaseFilter.
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