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https://issues.apache.org/jira/browse/LUCENE-2211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12800709#action_12800709
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Uwe Schindler commented on LUCENE-2211:
---------------------------------------
Fixed in Lucene 3.0 revision: 899639
> Advances BaseTokenStreamTestCase that uses a fake attribute to check, if
> clearAttributes() was called correctly - found bugs in contrib/analyzers
> -------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-2211
> URL: https://issues.apache.org/jira/browse/LUCENE-2211
> Project: Lucene - Java
> Issue Type: Bug
> Components: Analysis, contrib/analyzers
> Affects Versions: 2.9, 2.9.1, 3.0
> Reporter: Uwe Schindler
> Fix For: 2.9.2, 3.0.1, 3.1
>
> Attachments: LUCENE-2211-branch30.patch, LUCENE-2211.patch,
> LUCENE-2211.patch, LUCENE-2211.patch, LUCENE-2211.patch, LUCENE-2211.patch,
> LUCENE-2211.patch, LUCENE-2211.patch, LUCENE-2211.patch
>
>
> Robert had the idea to use a fake attribute inside BaseTokenStreamTestCase
> that records if its clear() method was called. If this is not the case after
> incrementToken(), asserTokenStreamContents fails. It also uses the attribute
> in TeeSinkTokenFilter, because there a lot of copying, captureState and
> restoreState() is used. By the attribute, you can track wonderful, if
> save/restore and clearAttributes is correctly implemented. It also verifies
> that *before* a captureState() it was also cleared (as the state will also
> contain the clear call). Because if you consume tokens in a filter, capture
> the consumed tokens and insert them, the capturedStates must also be cleared
> before.
> In contrib analyzers are some test that fail to pass this additional
> assertion. They are not fixed in the attached patch.
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