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https://issues.apache.org/jira/browse/LUCENE-2100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12786125#action_12786125
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Robert Muir commented on LUCENE-2100:
-------------------------------------

Simon what do you suggest? Instead of breaking in 3.1, should we add a warning 
'this will become final in X.Y, please do not subclass it, because it is not a 
good idea' ???

Uwe did some similar thing with making all the TokenStreams final before but I 
don't remember what the approach was (maybe just a break)

> Make contrib analyzers final
> ----------------------------
>
>                 Key: LUCENE-2100
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2100
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: contrib/analyzers
>    Affects Versions: 1.9, 2.0.0, 2.1, 2.2, 2.3, 2.3.1, 2.3.2, 2.4, 2.4.1, 
> 2.9, 2.9.1, 3.0
>            Reporter: Simon Willnauer
>            Priority: Minor
>             Fix For: 3.1
>
>
> The analyzers in contrib/analyzers should all be marked final. None of the 
> Analyzers should ever be subclassed - users should build their own analyzers 
> if a different combination of filters and Tokenizers is desired.

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