org.apache.lucene.search

Class TopDocs

java.lang.Object

org.apache.lucene.search.TopDocs

Direct Known Subclasses:

TopFieldDocs

public class TopDocs
extends Object

Represents hits returned by IndexSearcher.search(Query,Filter,int) and IndexSearcher.search(Query,int).

Field Summary

Fields

Modifier and Type	Field and Description
ScoreDoc[]	scoreDocs The top hits for the query.
int	totalHits The total number of hits for the query.

Constructor Summary

Constructors

Constructor and Description
TopDocs(int totalHits, ScoreDoc[] scoreDocs, float maxScore)

Method Summary

Methods

Modifier and Type	Method and Description
float	getMaxScore() Returns the maximum score value encountered.
static TopDocs	merge(Sort sort, int start, int size, TopDocs[] shardHits) Same as merge(Sort, int, TopDocs[]) but also slices the result at the same time based on the provided start and size.
static TopDocs	merge(Sort sort, int topN, TopDocs[] shardHits) Returns a new TopDocs, containing topN results across the provided TopDocs, sorting by the specified Sort.
void	setMaxScore(float maxScore) Sets the maximum score value encountered.

Methods inherited from class java.lang.Object

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

Field Detail

totalHits

public int totalHits

The total number of hits for the query.

scoreDocs

public ScoreDoc[] scoreDocs

The top hits for the query.

Constructor Detail

TopDocs

public TopDocs(int totalHits,
       ScoreDoc[] scoreDocs,
       float maxScore)

Method Detail

getMaxScore

public float getMaxScore()

Returns the maximum score value encountered. Note that in case scores are not tracked, this returns Float.NaN.

setMaxScore

public void setMaxScore(float maxScore)

Sets the maximum score value encountered.

merge

public static TopDocs merge(Sort sort,
            int topN,
            TopDocs[] shardHits)
                     throws IOException

Returns a new TopDocs, containing topN results across the provided TopDocs, sorting by the specified Sort. Each of the TopDocs must have been sorted by the same Sort, and sort field values must have been filled (ie, fillFields=true must be passed to TopFieldCollector.create(org.apache.lucene.search.Sort, int, boolean, boolean, boolean, boolean).

Pass sort=null to merge sort by score descending.

Throws:

IOException

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

merge

public static TopDocs merge(Sort sort,
            int start,
            int size,
            TopDocs[] shardHits)
                     throws IOException

Same as merge(Sort, int, TopDocs[]) but also slices the result at the same time based on the provided start and size. The return TopDocs will always have a scoreDocs with length of at most size.

Throws:

IOException