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https://issues.apache.org/jira/browse/LUCENE-3434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13104646#comment-13104646
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Robert Muir commented on LUCENE-3434:
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I think you can remove the suppresswarnings and use Collections.emptyMap()
instead of Collections.EMPTY_MAP ?
> Make ShingleAnalyzerWrapper and PerFieldAnalyzerWrapper immutable
> -----------------------------------------------------------------
>
> Key: LUCENE-3434
> URL: https://issues.apache.org/jira/browse/LUCENE-3434
> Project: Lucene - Java
> Issue Type: Improvement
> Components: modules/analysis
> Reporter: Chris Male
> Attachments: LUCENE-3434-3x.patch, LUCENE-3434-trunk.patch
>
>
> Both ShingleAnalyzerWrapper and PerFieldAnalyzerWrapper have setters which
> change some state which impacts their analysis stack. If these are going to
> become reusable, then the state must be immutable as changing it will have no
> effect.
> Process will be similar to QueryAutoStopWordAnalyzer, I will remove in trunk
> and deprecate in 3x.
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