Allow easy extensions of TopDocCollector
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Key: LUCENE-1356
URL: https://issues.apache.org/jira/browse/LUCENE-1356
Project: Lucene - Java
Issue Type: Improvement
Components: Index
Reporter: Shai Erera
Priority: Minor
Attachments: 1356.patch
TopDocCollector's members and constructor are declared either private or
package visible. It makes it hard to extend it as if you want to extend it you
can reuse its *hq* and *totatlHits* members, but need to define your own. It
also forces you to override getTotalHits() and topDocs().
By changing its members and constructor (the one that accepts a PQ) to
protected, we allow users to extend it in order to get a different view of 'top
docs' (like TopFieldCollector does), but still enjoy its getTotalHits() and
topDocs() method implementations.
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