[jira] [Commented] (LUCENE-5186) Add CachingWrapperFilter.getFilter()

["Adrien Grand (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-5186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13747308#comment-13747308 ] 

Adrien Grand commented on LUCENE-5186:
--------------------------------------

This sounds good to me, would you like to write a patch?
                
> Add CachingWrapperFilter.getFilter()
> ------------------------------------
>
>                 Key: LUCENE-5186
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5186
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/search
>            Reporter: Trejkaz
>            Priority: Minor
>
> There are a couple of use cases I can think of where being able to get the underlying filter out of CachingWrapperFilter would be useful:
> 1. You might want to introspect the filter to figure out what's in it (the use case we hit.)
> 2. You might want to serialise the filter since Lucene no longer supports that itself.
> We currently work around this by subclassing, keeping another copy of the underlying filter reference and implementing a trivial getter, which is an easy workaround, but the trap is that a junior developer could unknowingly create a CachingWrapperFilter without knowing that the BetterCachingWrapperFilter exists, introducing a filter which cannot be introspected.

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