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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2404) Improve speed of ThaiWordFilter by CharacterIterator, factor out LowerCasing and also fix some bugs (empty tokens stop iteration)
Date Mon, 19 Apr 2010 17:39:52 GMT
Improve speed of ThaiWordFilter by CharacterIterator, factor out LowerCasing and also fix some
bugs (empty tokens stop iteration)
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                 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: Robert Muir
             Fix For: 3.1
         Attachments: 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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