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Date: Mon, 19 Apr 2010 16:43:50 -0400 (EDT)
From: "Uwe Schindler (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Assigned: (LUCENE-2404) Improve speed of ThaiWordFilter by
 CharacterIterator, factor out LowerCasing and also fix some bugs (empty
 tokens stop iteration)
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     [ https://issues.apache.org/jira/browse/LUCENE-2404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Uwe Schindler reassigned LUCENE-2404:
-------------------------------------

    Assignee: Uwe Schindler  (was: Robert Muir)

> 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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