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https://issues.apache.org/jira/browse/LUCENE-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13456361#comment-13456361
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Uwe Schindler commented on LUCENE-4391:
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+1, I was thinking aout a similar thing, too! If somebody wants to create 
another codec, reusing *some* Lucene40 stuff, he should subclass Codec directly 
and delegate the needed things to Codec.forName("Lucene40").fooBar()

The same should be done for Lucene40 PostingsFormat!
                
> Lucene40Codec methods should be final
> -------------------------------------
>
>                 Key: LUCENE-4391
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4391
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Adrien Grand
>             Fix For: 4.0
>
>
> I think all methods but {{getPostingsFormatForField}} should be made final so 
> that users can't create a Codec that redefines any of the formats of Lucene40 
> by subclassing (since the codec name can't be overriden by subclassing, 
> Lucene will fail at loading segments that use such codecs).

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