# Hierarchy For Package org.apache.lucene.search.grouping

## Class Hierarchy

- java.lang.Object
  - org.apache.lucene.search.grouping.AllGroupHeadsCollector.GroupHead<T>
  - org.apache.lucene.search.grouping.DistinctValuesCollector.GroupCount<T,R>
  - org.apache.lucene.search.grouping.GroupDocs<T>
  - org.apache.lucene.search.grouping.GroupFacetCollector.FacetEntry
  - org.apache.lucene.search.grouping.GroupFacetCollector.GroupedFacetResult
  - org.apache.lucene.search.grouping.GroupFacetCollector.SegmentResult
  - org.apache.lucene.search.grouping.GroupingSearch
  - org.apache.lucene.search.grouping.GroupReducer<T,C>
  - org.apache.lucene.search.grouping.GroupSelector<T>
    - org.apache.lucene.search.grouping.TermGroupSelector
    - org.apache.lucene.search.grouping.ValueSourceGroupSelector
  - org.apache.lucene.search.grouping.SearchGroup<T>
    - org.apache.lucene.search.grouping.CollectedSearchGroup<T>
  - org.apache.lucene.search.SimpleCollector (implements org.apache.lucene.search.Collector, org.apache.lucene.search.LeafCollector)
    - org.apache.lucene.search.grouping.AllGroupHeadsCollector<T>
    - org.apache.lucene.search.grouping.AllGroupsCollector<T>
    - org.apache.lucene.search.grouping.BlockGroupingCollector
    - org.apache.lucene.search.grouping.FirstPassGroupingCollector<T>
    - org.apache.lucene.search.grouping.GroupFacetCollector
      - org.apache.lucene.search.grouping.TermGroupFacetCollector
    - org.apache.lucene.search.grouping.SecondPassGroupingCollector<T>
      - org.apache.lucene.search.grouping.DistinctValuesCollector<T,R>
      - org.apache.lucene.search.grouping.TopGroupsCollector<T>
  - org.apache.lucene.search.grouping.TopGroups<T>

## Enum Hierarchy

- java.lang.Object
  - java.lang.Enum<E> (implements java.lang.Comparable<T>, java.io.Serializable)
    - org.apache.lucene.search.grouping.TopGroups.ScoreMergeMode
    - org.apache.lucene.search.grouping.GroupSelector.State

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