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From "Robert Muir (JIRA)" <>
Subject [jira] Updated: (LUCENE-2653) ThaiAnalyzer assumes things about your jre
Date Sat, 18 Sep 2010 16:42:32 GMT


Robert Muir updated LUCENE-2653:

    Attachment: LUCENE-2653.patch

Here's a patch: it detects statically if the BreakIterator from thai locale will actually
work at all,
and sets a boolean DBBI_AVAILABLE

in the ctor if this is false, it throws UOE("This JRE does not have support for Thai segmentation")

I also added docs referring to ICUTokenizer in case you need this across all jres, and put
Assume.assumeTrue(ThaiWordFilter.DBBI_AVAILABLE) in the tests.

> ThaiAnalyzer assumes things about your jre
> ------------------------------------------
>                 Key: LUCENE-2653
>                 URL:
>             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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