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https://issues.apache.org/jira/browse/LUCENE-6952?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley updated LUCENE-6952:
---------------------------------
    Attachment: LUCENE_6952.patch

I expanded the scope to include any class starting with Filter that is a 
delegate that wasn't already abstract:

Lucene-core:
* FilterCodecReader
* FilterLeafReader
* FilterCollector
* FilterDirectory

Lucene-test-framework
* FilterFileChannel
* FilterFileStore
* _not_ FilterFileSystem
* FilterFileSystemProvider
* FilterOutputStream2
* _not_ FilterPath

When I had tentatively made FilterFileSystem and FilterPath abstract, I noticed 
a bunch of direct usages that seemed to use it as a pair of a delegate with a 
FileSystem impl so it wasn't a pure delegate.  But that's debatable; it's fine 
either way I guess.

> FilterLeafReader and friends should be abstract
> -----------------------------------------------
>
>                 Key: LUCENE-6952
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6952
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: David Smiley
>            Priority: Minor
>             Fix For: master
>
>         Attachments: LUCENE_6952.patch
>
>
> I think it's confusing that FilterLeafReader (and it's Filter\* inner 
> classes) are not abstract.  By making them abstract, we clarify to users how 
> to use them by virtue of them being abstract.  It seems only a couple tests 
> directly instantiate them.



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