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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2653) ThaiAnalyzer assumes things about your jre
Date Sun, 19 Sep 2010 14:42:32 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12912234#action_12912234
] 

Robert Muir commented on LUCENE-2653:
-------------------------------------

no, in this case the filter does not work at all, it does nothing.

> ThaiAnalyzer assumes things about your jre
> ------------------------------------------
>
>                 Key: LUCENE-2653
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2653
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: contrib/analyzers
>    Affects Versions: 3.1, 4.0
>            Reporter: Robert Muir
>         Attachments: LUCENE-2653.patch
>
>
> The ThaiAnalyzer/ThaiWordFilter depends on the fact that BreakIterator.getWordInstance(new
Locale("th")) returns a dictionary-based break iterator that can segment thai phrases into
words (it does not use whitespace).
> But this is non-standard that the JRE will specialize this locale in this way, its nice,
but you can't depend on it.
> For example, if you are running on IBM JRE, this analyzer/wordfilter is completely "broken"
in the sense it won't do what it claims to do.
> At the minimum, we need to document this and suggest users look at ICUTokenizer for thai,
which always has this breakiterator and is not jre-dependent.
> Better, would be to check statically that the thing actually works.
> when creating a new ThaiWordFilter we could clone() the BreakIterator, which is often
cheaper than making a new one anyway.
> we could throw an exception, if its not supported, and add a boolean so the user knows
it works.
> and we could refer to this boolean with Assert.assume in its tests.

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