Package org.apache.lucene.search

Class TopFieldCollector

java.lang.Object

org.apache.lucene.search.TopDocsCollector<FieldValueHitQueue.Entry>

org.apache.lucene.search.TopFieldCollector

All Implemented Interfaces:

Collector

public abstract class TopFieldCollector
extends TopDocsCollector<FieldValueHitQueue.Entry>

A Collector that sorts by SortField using FieldComparators.

See the constructor of TopFieldCollectorManager for instantiating a TopFieldCollectorManager with support for concurrency in IndexSearcher.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary

Fields inherited from class org.apache.lucene.search.TopDocsCollector

EMPTY_TOPDOCS, pq, totalHits, totalHitsRelation

Method Summary

Modifier and Type	Method	Description
boolean	isEarlyTerminated()	Return whether collection terminated early.
protected TopDocs	newTopDocs(ScoreDoc[] results, int start)	Returns a TopDocs instance containing the given results.
protected void	populateResults(ScoreDoc[] results, int howMany)	Populates the results array with the ScoreDoc instances.
static void	populateScores(ScoreDoc[] topDocs, IndexSearcher searcher, Query query)	Populate scores of the given topDocs.
ScoreMode	scoreMode()	Indicates what features are required from the scorer.
TopFieldDocs	topDocs()	Returns the top docs that were collected by this collector.
protected void	updateGlobalMinCompetitiveScore(Scorable scorer)
protected void	updateMinCompetitiveScore(Scorable scorer)

Methods inherited from class org.apache.lucene.search.TopDocsCollector

getTotalHits, topDocs, topDocs, topDocsSize

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.lucene.search.Collector

getLeafCollector, setWeight

Method Details

scoreMode

public ScoreMode scoreMode()

Description copied from interface: Collector

Indicates what features are required from the scorer.

updateGlobalMinCompetitiveScore

protected void updateGlobalMinCompetitiveScore(Scorable scorer)
                                        throws IOException

Throws:

IOException

updateMinCompetitiveScore

protected void updateMinCompetitiveScore(Scorable scorer)
                                  throws IOException

Throws:

IOException

populateScores

public static void populateScores(ScoreDoc[] topDocs,
 IndexSearcher searcher,
 Query query)
                           throws IOException

Populate scores of the given topDocs.

Parameters:

topDocs - the top docs to populate

searcher - the index searcher that has been used to compute topDocs

query - the query that has been used to compute topDocs

Throws:

IllegalArgumentException - if there is evidence that topDocs have been computed against a different searcher or a different query.

IOException

WARNING: This API is experimental and might change in incompatible ways in the next release.

populateResults

protected void populateResults(ScoreDoc[] results,
 int howMany)

Description copied from class: TopDocsCollector

Populates the results array with the ScoreDoc instances. This can be overridden in case a different ScoreDoc type should be returned.

Overrides:

populateResults in class TopDocsCollector<FieldValueHitQueue.Entry>

newTopDocs

protected TopDocs newTopDocs(ScoreDoc[] results,
 int start)

Description copied from class: TopDocsCollector

Returns a TopDocs instance containing the given results. If results is null it means there are no results to return, either because there were 0 calls to collect() or because the arguments to topDocs were invalid.

Overrides:

newTopDocs in class TopDocsCollector<FieldValueHitQueue.Entry>

topDocs

public TopFieldDocs topDocs()

Description copied from class: TopDocsCollector

Returns the top docs that were collected by this collector.

Overrides:

topDocs in class TopDocsCollector<FieldValueHitQueue.Entry>

isEarlyTerminated

public boolean isEarlyTerminated()

Return whether collection terminated early.