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https://issues.apache.org/jira/browse/LUCENE-5202?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benson Margulies updated LUCENE-5202:
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Description:
This is a bit hard to explain except by looking at the test case. I've coded a
filter that uses LookaheadTokenFilter. The incrementToken method peeks some
tokens. Then, it seems, nextToken in the Lookahead class calls peekToken
itself, which seems to me to consume a token so that it's not seen when the
derived class sets out to process the next set of tokens.
In passing, this test case can be used to demonstrate that it does not work to
try to use the afterPosition method to set up attributes of the token that
we're 'after'. Probably that was never intended. However, I'm hoping for some
feedback as to whether the rest of the structure here is as intended for
subclasses of LookaheadTokenFilter.
was:
I will attach a patch including a unit test that demonstrates this.
In addition, there will be a test case in which the token book-keeping seems to
go wrong.
> LookaheadTokenFilter consumes an extra token in nextToken
> ---------------------------------------------------------
>
> Key: LUCENE-5202
> URL: https://issues.apache.org/jira/browse/LUCENE-5202
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 4.3.1
> Reporter: Benson Margulies
> Attachments: LUCENE-5202.patch
>
>
> This is a bit hard to explain except by looking at the test case. I've coded
> a filter that uses LookaheadTokenFilter. The incrementToken method peeks some
> tokens. Then, it seems, nextToken in the Lookahead class calls peekToken
> itself, which seems to me to consume a token so that it's not seen when the
> derived class sets out to process the next set of tokens.
> In passing, this test case can be used to demonstrate that it does not work
> to try to use the afterPosition method to set up attributes of the token that
> we're 'after'. Probably that was never intended. However, I'm hoping for some
> feedback as to whether the rest of the structure here is as intended for
> subclasses of LookaheadTokenFilter.
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