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https://issues.apache.org/jira/browse/LUCENE-2653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12912227#action_12912227
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Robert Muir commented on LUCENE-2653:
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bq. Could that have been a bw break since it did not do what it claimed to do?
I dont understand the question. ThaiWordFilter has always been broken this way,
it is broken by design.
> 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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