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## org.apache.lucene.search.grouping.function
Class FunctionAllGroupsCollector

    java.lang.Object
      org.apache.lucene.search.Collector
          org.apache.lucene.search.grouping.AbstractAllGroupsCollector<MutableValue>
              org.apache.lucene.search.grouping.function.FunctionAllGroupsCollector

    public class FunctionAllGroupsCollector

extends AbstractAllGroupsCollector<MutableValue>

A collector that collects all groups that match the query. Only the group value is collected, and the order is undefined. This collector does not determine the most relevant document of a group.

Implementation detail: Uses `ValueSource` and `FunctionValues` to retrieve the field values to group by.

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

Constructor Summary
`FunctionAllGroupsCollector(ValueSource groupBy, Map<?,?> vsContext)` Constructs a `FunctionAllGroupsCollector` instance.

Method Summary
`void` | `collect(int doc)`
`Collection<MutableValue>` | `getGroups()` Returns the group values This is an unordered collections of group values.
`void` | `setNextReader(AtomicReaderContext context)`

Methods inherited from class org.apache.lucene.search.grouping.AbstractAllGroupsCollector
`acceptsDocsOutOfOrder, getGroupCount, setScorer`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### FunctionAllGroupsCollector

    public FunctionAllGroupsCollector(ValueSource groupBy,
                                      Map<?,?> vsContext)

  Constructs a `FunctionAllGroupsCollector` instance.

  Parameters:
    `groupBy` - The `ValueSource` to group by
    `vsContext` - The ValueSource context

Method Detail

### getGroups

    public Collection<MutableValue> getGroups()

  Description copied from class: `AbstractAllGroupsCollector`
  Returns the group values

  This is an unordered collections of group values. For each group that matched the query there is a `BytesRef` representing a group value.

  Specified by:
    `getGroups` in class `AbstractAllGroupsCollector<MutableValue>`
  Returns:
    the group values

### collect

    public void collect(int doc)
                 throws IOException

  Specified by:
    `collect` in class `Collector`
  Throws:
    `IOException`

### setNextReader

    public void setNextReader(AtomicReaderContext context)
                       throws IOException

  Specified by:
    `setNextReader` in class `Collector`
  Throws:
    `IOException`

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