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https://issues.apache.org/jira/browse/LUCENE-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13464704#comment-13464704
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Shai Erera commented on LUCENE-4391:
------------------------------------

I really don't like the delegate() solution ... every method calls this, which 
in turn calls Codec.forName(). I have a solution and a simple patch to this. 
I'll open a separate issue as it's focused just on FilterCodec.
                
> 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
>            Assignee: Adrien Grand
>             Fix For: 4.0
>
>         Attachments: LUCENE-4391.patch, LUCENE-4391.patch
>
>
> 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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