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

    java.lang.Object
      org.apache.lucene.search.Collector
          org.apache.lucene.search.grouping.AbstractDistinctValuesCollector<FunctionDistinctValuesCollector.GroupCount>
              org.apache.lucene.search.grouping.function.FunctionDistinctValuesCollector

    public class FunctionDistinctValuesCollector

extends AbstractDistinctValuesCollector<FunctionDistinctValuesCollector.GroupCount>

Function based implementation of `AbstractDistinctValuesCollector`.

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

Nested Class Summary
`static class` | `FunctionDistinctValuesCollector.GroupCount` Holds distinct values for a single group.

Constructor Summary
`FunctionDistinctValuesCollector(Map<?,?> vsContext, ValueSource groupSource, ValueSource countSource, Collection<SearchGroup<MutableValue>> groups)`

Method Summary
`void` | `collect(int doc)`
`List<FunctionDistinctValuesCollector.GroupCount>` | `getGroups()` Returns all unique values for each top N group.
`void` | `setNextReader(AtomicReaderContext context)`

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

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

Constructor Detail

### FunctionDistinctValuesCollector

    public FunctionDistinctValuesCollector(Map<?,?> vsContext,
                                           ValueSource groupSource,
                                           ValueSource countSource,
                                           Collection<SearchGroup<MutableValue>> groups)

Method Detail

### getGroups

    public List<FunctionDistinctValuesCollector.GroupCount> getGroups()

  Description copied from class: `AbstractDistinctValuesCollector`
  Returns all unique values for each top N group.

  Specified by:
    `getGroups` in class `AbstractDistinctValuesCollector<FunctionDistinctValuesCollector.GroupCount>`
  Returns:
    all unique values for each top N group

### 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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