org.apache.lucene.search.grouping
Class AbstractDistinctValuesCollector<GC extends AbstractDistinctValuesCollector.GroupCount<?>>

java.lang.Object
  org.apache.lucene.search.Collector
      org.apache.lucene.search.grouping.AbstractDistinctValuesCollector<GC>

Direct Known Subclasses:

FunctionDistinctValuesCollector, TermDistinctValuesCollector

public abstract class AbstractDistinctValuesCollector<GC extends AbstractDistinctValuesCollector.GroupCount<?>>
extends Collector

A second pass grouping collector that keeps track of distinct values for a specified field for the top N group.

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

Nested Class Summary

static class

AbstractDistinctValuesCollector.GroupCount<GROUP_VALUE_TYPE> Returned by getGroups(), representing the value and set of distinct values for the group.

Constructor Summary

AbstractDistinctValuesCollector()

Method Summary

boolean	acceptsDocsOutOfOrder()
abstract List<GC>	getGroups() Returns all unique values for each top N group.
void	setScorer(Scorer scorer)

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

collect, setNextReader

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractDistinctValuesCollector

public AbstractDistinctValuesCollector()

Method Detail

getGroups

public abstract List<GC> getGroups()

Returns all unique values for each top N group.

Returns:

all unique values for each top N group

acceptsDocsOutOfOrder

public boolean acceptsDocsOutOfOrder()

Specified by:

acceptsDocsOutOfOrder in class Collector

setScorer

public void setScorer(Scorer scorer)
               throws IOException

Specified by:

setScorer in class Collector

Throws:

IOException