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