TopDocsCollector should be abstract super class that is the real
"TopDocsCollector" contract, a subclass should implement the priority-queue
logic. e.g. PQTopDocsCollector
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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, 3.0.2
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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