org.apache.lucene.search.grouping

## Class ValueSourceGroupSelector

- java.lang.Object
- - org.apache.lucene.search.grouping.GroupSelector<MutableValue>
  - - org.apache.lucene.search.grouping.ValueSourceGroupSelector

-     public class ValueSourceGroupSelector
      extends GroupSelector<MutableValue>

  A GroupSelector that groups via a ValueSource

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.apache.lucene.search.grouping.GroupSelector

      `GroupSelector.State`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `ValueSourceGroupSelector(ValueSource valueSource, Map<?,?> context)` Create a new ValueSourceGroupSelector

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `GroupSelector.State` | `advanceTo(int doc)` Advance the GroupSelector's iterator to the given document
    `MutableValue` | `copyValue()`
    `MutableValue` | `currentValue()` Get the group value of the current document N.B.
    `void` | `setGroups(Collection<SearchGroup<MutableValue>> searchGroups)` Set a restriction on the group values returned by this selector If the selector is positioned on a document whose group value is not contained within this set, then `GroupSelector.advanceTo(int)` will return `GroupSelector.State.SKIP`
    `void` | `setNextReader(LeafReaderContext readerContext)` Set the LeafReaderContext

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### ValueSourceGroupSelector

          public ValueSourceGroupSelector(ValueSource valueSource,
                                          Map<?,?> context)

      Create a new ValueSourceGroupSelector
      Parameters:
        `valueSource` - the ValueSource to group by
        `context` - a context map for the ValueSource

  - ### Method Detail

    - #### setNextReader

          public void setNextReader(LeafReaderContext readerContext)
                             throws IOException

      Description copied from class: `GroupSelector`
      Set the LeafReaderContext
      Specified by:
        `setNextReader` in class `GroupSelector<MutableValue>`
      Throws:
        `IOException`

    - #### advanceTo

          public GroupSelector.State advanceTo(int doc)
                                        throws IOException

      Description copied from class: `GroupSelector`
      Advance the GroupSelector's iterator to the given document
      Specified by:
        `advanceTo` in class `GroupSelector<MutableValue>`
      Throws:
        `IOException`

    - #### currentValue

          public MutableValue currentValue()

      Description copied from class: `GroupSelector`
      Get the group value of the current document N.B. this object may be reused, for a persistent version use `GroupSelector.copyValue()`
      Specified by:
        `currentValue` in class `GroupSelector<MutableValue>`

    - #### copyValue

          public MutableValue copyValue()

      Specified by:
        `copyValue` in class `GroupSelector<MutableValue>`
      Returns:
        a copy of the group value of the current document

    - #### setGroups

          public void setGroups(Collection<SearchGroup<MutableValue>> searchGroups)

      Description copied from class: `GroupSelector`
      Set a restriction on the group values returned by this selector If the selector is positioned on a document whose group value is not contained within this set, then `GroupSelector.advanceTo(int)` will return `GroupSelector.State.SKIP`
      Specified by:
        `setGroups` in class `GroupSelector<MutableValue>`
      Parameters:
        `searchGroups` - a set of `SearchGroup` objects to limit selections to

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