org.apache.lucene.search.grouping.term

Class TermDistinctValuesCollector

java.lang.Object

org.apache.lucene.search.SimpleCollector

org.apache.lucene.search.grouping.AbstractDistinctValuesCollector<TermDistinctValuesCollector.GroupCount>

org.apache.lucene.search.grouping.term.TermDistinctValuesCollector

All Implemented Interfaces:

Collector, LeafCollector

public class TermDistinctValuesCollector
extends AbstractDistinctValuesCollector<TermDistinctValuesCollector.GroupCount>

A term based implementation of AbstractDistinctValuesCollector that relies on SortedDocValues to count the distinct values per group.

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

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	TermDistinctValuesCollector.GroupCount Holds distinct values for a single group.

Constructor Summary

Constructors

Constructor and Description
TermDistinctValuesCollector(String groupField, String countField, Collection<SearchGroup<BytesRef>> groups) Constructs TermDistinctValuesCollector instance.

Method Summary

Modifier and Type	Method and Description
void	collect(int doc)
protected void	doSetNextReader(LeafReaderContext context)
List<TermDistinctValuesCollector.GroupCount>	getGroups() Returns all unique values for each top N group.

Methods inherited from class org.apache.lucene.search.grouping.AbstractDistinctValuesCollector

needsScores

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

getLeafCollector, setScorer

Methods inherited from class java.lang.Object

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

Constructor Detail

TermDistinctValuesCollector

public TermDistinctValuesCollector(String groupField,
                                   String countField,
                                   Collection<SearchGroup<BytesRef>> groups)

Constructs TermDistinctValuesCollector instance.

Parameters:

groupField - The field to group by

countField - The field to count distinct values for

groups - The top N groups, collected during the first phase search

Method Detail

collect

public void collect(int doc)
             throws IOException

Specified by:

collect in interface LeafCollector

Specified by:

collect in class SimpleCollector

Throws:

IOException

getGroups

public List<TermDistinctValuesCollector.GroupCount> getGroups()

Description copied from class: AbstractDistinctValuesCollector

Returns all unique values for each top N group.

Specified by:

getGroups in class AbstractDistinctValuesCollector<TermDistinctValuesCollector.GroupCount>

Returns:

all unique values for each top N group

doSetNextReader

protected void doSetNextReader(LeafReaderContext context)
                        throws IOException

Overrides:

doSetNextReader in class SimpleCollector

Throws:

IOException