Class DistinctValuesCollector<T,R>
- java.lang.Object
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- org.apache.lucene.search.SimpleCollector
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- org.apache.lucene.search.grouping.SecondPassGroupingCollector<T>
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- org.apache.lucene.search.grouping.DistinctValuesCollector<T,R>
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- All Implemented Interfaces:
Collector
,LeafCollector
public class DistinctValuesCollector<T,R> extends SecondPassGroupingCollector<T>
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.
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
DistinctValuesCollector.GroupCount<T,R>
Returned bygetGroups()
, representing the value and set of distinct values for the group.
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Field Summary
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Fields inherited from class org.apache.lucene.search.grouping.SecondPassGroupingCollector
groupReducer, groups, groupSelector, totalGroupedHitCount, totalHitCount
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Constructor Summary
Constructors Constructor Description DistinctValuesCollector(GroupSelector<T> groupSelector, Collection<SearchGroup<T>> groups, GroupSelector<R> valueSelector)
Create a DistinctValuesCollector
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description List<DistinctValuesCollector.GroupCount<T,R>>
getGroups()
Returns all unique values for each top N group.-
Methods inherited from class org.apache.lucene.search.grouping.SecondPassGroupingCollector
collect, doSetNextReader, getGroupSelector, scoreMode, setScorer
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Methods inherited from class org.apache.lucene.search.SimpleCollector
getLeafCollector
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.apache.lucene.search.LeafCollector
competitiveIterator
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Constructor Detail
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DistinctValuesCollector
public DistinctValuesCollector(GroupSelector<T> groupSelector, Collection<SearchGroup<T>> groups, GroupSelector<R> valueSelector)
Create a DistinctValuesCollector- Parameters:
groupSelector
- the group selector to determine the top-level groupsgroups
- the top-level groups to collect forvalueSelector
- a group selector to determine which values to collect per-group
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Method Detail
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getGroups
public List<DistinctValuesCollector.GroupCount<T,R>> getGroups()
Returns all unique values for each top N group.- Returns:
- all unique values for each top N group
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