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https://issues.apache.org/jira/browse/LUCENE-8503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16617309#comment-16617309
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Simon Willnauer commented on LUCENE-8503:
-----------------------------------------
The reality is that unwrapping happens all over the place even in our codebase.
I suspect this is a common problem if you start work with reader hierarchies. I
wonder if you would ever see this interface if you don't work with expert API.
In this case I think we just make our live easier without risking anything.
> Simplify unwrapping Filter*Reader
> ---------------------------------
>
> Key: LUCENE-8503
> URL: https://issues.apache.org/jira/browse/LUCENE-8503
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 7.5, master (8.0)
> Reporter: Simon Willnauer
> Priority: Major
> Fix For: 7.6, master (8.0)
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Today we have 3 different kinds of FilterIndexReader. While
> FilterDirecotryReader
> and FilterLeafReader are simple to distinguish, FilterCodecReader make
> decision harder
> since now we need instanceof checks to deside which unwrap method we
> should call. This
> adds a simple interface that allows to build generic unwrap methods to
> access the delegat
> of each of the filtering readers.
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