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https://issues.apache.org/jira/browse/LUCENE-2542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12890575#action_12890575
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Shai Erera commented on LUCENE-2542:
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Patch looks good. I think it's ready to commit, but it will take me another day
or two until I can get to it. So if someone else wants to commit it, please do.
> TopDocsCollector should be abstract super class that is the real
> "TopDocsCollector" contract, a subclass should implement the priority-queue
> logic. e.g. PQTopDocsCollector
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-2542
> URL: https://issues.apache.org/jira/browse/LUCENE-2542
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Affects Versions: 3.0.2
> Reporter: Woody Anderson
> Fix For: 4.0
>
> Attachments: LUCENE-2542.patch, LUCENE-2542.patch, LUCENE-2542.patch,
> LUCENE_3.0.2-2542.patch
>
>
> TopDocsCollector is both an abstract interface for producing TopDocs as well
> as a PriorityQueue based implementation.
> Not all Collectors that could produce TopDocs must use a PriorityQueue, and
> it would be advantageous to allow the TopDocsCollector to be an "interface"
> type abstract class, with a PQTopDocsCollector sub-class.
> While doing this, it'd be good to clean up the generics uses in these
> classes. As it's odd to create a TopFieldCollector and have to case the
> TopDocs object, when this can be fixed with generics.
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