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

java.lang.Object
  org.apache.lucene.search.Collector
      org.apache.lucene.search.grouping.AbstractDistinctValuesCollector<TermDistinctValuesCollector.GroupCount>
          org.apache.lucene.search.grouping.term.TermDistinctValuesCollector

public class TermDistinctValuesCollector
extends AbstractDistinctValuesCollector<TermDistinctValuesCollector.GroupCount>

A term based implementation of AbstractDistinctValuesCollector that relies on FieldCache.DocTermsIndex 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

static class

TermDistinctValuesCollector.GroupCount Holds distinct values for a single group.

Constructor Summary

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

Method Summary

void	collect(int doc)
List<TermDistinctValuesCollector.GroupCount>	getGroups() Returns all unique values for each top N group.
void	setNextReader(AtomicReaderContext context)

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

acceptsDocsOutOfOrder, 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 class Collector

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

setNextReader

public void setNextReader(AtomicReaderContext context)
                   throws IOException

Specified by:

setNextReader in class Collector

Throws:

IOException