| java.lang.Object | ||
| ↳ | org.apache.lucene.search.Collector | |
| ↳ | org.apache.lucene.search.PositiveScoresOnlyCollector | |
Class Overview
A Collector implementation which wraps another
Collector and makes sure only documents with
scores > 0 are collected.
Summary
| Public Constructors | |||||||||||
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| Public Methods | |||||||||||
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Return
true if this collector does not
require the matching docIDs to be delivered in int sort
order (smallest to largest) to collect(int). | |||||||||||
Called once for every document matching a query, with the unbased document
number.
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Called before collecting from each IndexReader.
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Called before successive calls to
collect(int). | |||||||||||
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[Expand]
Inherited Methods | |||||||||||
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From class
org.apache.lucene.search.Collector
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From class
java.lang.Object
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Public Constructors
Public Methods
public boolean acceptsDocsOutOfOrder ()
Return true if this collector does not
require the matching docIDs to be delivered in int sort
order (smallest to largest) to collect(int).
Most Lucene Query implementations will visit
matching docIDs in order. However, some queries
(currently limited to certain cases of BooleanQuery) can achieve faster searching if the
Collector allows them to deliver the
docIDs out of order.
Many collectors don't mind getting docIDs out of
order, so it's important to return true
here.
public void collect (int doc)
Called once for every document matching a query, with the unbased document number.
Note: This is called in an inner search loop. For good search performance,
implementations of this method should not call doc(int) or
document(int) on every hit.
Doing so can slow searches by an order of magnitude or more.
Throws
| IOException |
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public void setNextReader (IndexReader reader, int docBase)
Called before collecting from each IndexReader. All doc ids in
collect(int) will correspond to reader.
Add docBase to the current IndexReaders internal document id to re-base ids
in collect(int).
Parameters
| reader | next IndexReader |
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Throws
| IOException |
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public void setScorer (Scorer scorer)
Called before successive calls to collect(int). Implementations
that need the score of the current document (passed-in to
collect(int)), should save the passed-in Scorer and call
scorer.score() when needed.
Throws
| IOException |
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