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From "Simon Willnauer (JIRA)" <>
Subject [jira] Commented: (LUCENE-2653) ThaiAnalyzer assumes things about your jre
Date Sun, 19 Sep 2010 14:32:32 GMT


Simon Willnauer commented on LUCENE-2653:

bq. I dont understand the question. ThaiWordFilter has always been broken this way, it is
broken by design.
could somebody have used the broken behavior and relies on it? Just making sure its not a
bw break somehow which we should document.

> 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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