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https://issues.apache.org/jira/browse/LUCENE-1794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12741339#action_12741339
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Robert Muir commented on LUCENE-1794:
-------------------------------------

{quote}
reset() is always called by IndexWriter before consuming the TokenStream; end() 
is called as last operation on the TokenStream.
{quote}

Uwe, this may be the case for IndexWriter, but if I do not explicitly call it 
like so in ThaiAnalyzer, then ThaiWordFilter's reset() is not invoked:
{noformat}
  streams.source.reset(reader);
  streams.result.reset(); // reset the ThaiWordFilter's state <-- right here
{noformat}

By calling reset I can ensure it happens regardless of what is consuming the 
tokenstream... (such as my tests!) maybe this is overkill?


> implement reusableTokenStream for all contrib analyzers
> -------------------------------------------------------
>
>                 Key: LUCENE-1794
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1794
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: contrib/analyzers
>            Reporter: Robert Muir
>            Assignee: Robert Muir
>            Priority: Minor
>             Fix For: 2.9
>
>         Attachments: LUCENE-1794.patch, LUCENE-1794.patch
>
>
> most contrib analyzers do not have an impl for reusableTokenStream
> regardless of how expensive the back compat reflection is for indexing speed, 
> I think we should do this to mitigate any performance costs. hey, overall it 
> might even be an improvement!
> the back compat code for non-final analyzers is already in place so this is 
> easy money in my opinion.

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