org.apache.lucene.facet

## Class LongValueFacetCounts

- java.lang.Object
- - org.apache.lucene.facet.Facets
  - - org.apache.lucene.facet.LongValueFacetCounts

-     public class LongValueFacetCounts
      extends Facets

  `Facets` implementation that computes counts for all uniqute long values, more efficiently counting small values (0-1023) using an int array, and switching to a `HashMap` for values above 1023. Retrieve all facet counts, in value order, with `getAllChildrenSortByValue()`, or get the topN values sorted by count with `getTopChildrenSortByCount(int)`.
  WARNING: This API is experimental and might change in incompatible ways in the next release.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `LongValueFacetCounts(String field, FacetsCollector hits, boolean multiValued)` Create `LongValueFacetCounts`, using either single-valued `NumericDocValues` or multi-valued `SortedNumericDocValues` from the specified field.
    `LongValueFacetCounts(String field, IndexReader reader, boolean multiValued)` Counts all facet values for this reader.
    `LongValueFacetCounts(String field, LongValuesSource valueSource, FacetsCollector hits)` Create `LongValueFacetCounts`, using the provided `LongValuesSource`.
    `LongValueFacetCounts(String field, LongValuesSource valueSource, FacetsCollector hits, boolean multiValued)` Create `LongValueFacetCounts`, using the provided `LongValuesSource`.
    `LongValueFacetCounts(String field, LongValuesSource valueSource, IndexReader reader)` Counts all facet values for the provided `LongValuesSource`.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `FacetResult` | `getAllChildrenSortByValue()` Returns all unique values seen, sorted by value.
    `List<FacetResult>` | `getAllDims(int topN)` Returns topN labels for any dimension that had hits, sorted by the number of hits that dimension matched; this is used for "sparse" faceting, where many different dimensions were indexed, for example depending on the type of document.
    `Number` | `getSpecificValue(String dim, String... path)` Return the count or value for a specific path.
    `FacetResult` | `getTopChildren(int topN, String dim, String... path)` Returns the topN child labels under the specified path.
    `FacetResult` | `getTopChildrenSortByCount(int topN)` Returns the specified top number of facets, sorted by count.
    `String` | `toString()`

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

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

- - ### Constructor Detail

    - #### LongValueFacetCounts

          public LongValueFacetCounts(String field,
                                      FacetsCollector hits,
                                      boolean multiValued)
                               throws IOException

      Create `LongValueFacetCounts`, using either single-valued `NumericDocValues` or multi-valued `SortedNumericDocValues` from the specified field.
      Throws:
        `IOException`

    - #### LongValueFacetCounts

          public LongValueFacetCounts(String field,
                                      LongValuesSource valueSource,
                                      FacetsCollector hits)
                               throws IOException

      Create `LongValueFacetCounts`, using the provided `LongValuesSource`. If hits is null then all facets are counted.
      Throws:
        `IOException`

    - #### LongValueFacetCounts

          public LongValueFacetCounts(String field,
                                      LongValuesSource valueSource,
                                      FacetsCollector hits,
                                      boolean multiValued)
                               throws IOException

      Create `LongValueFacetCounts`, using the provided `LongValuesSource`. random access (implement `DocIdSet.bits()`).
      Throws:
        `IOException`

    - #### LongValueFacetCounts

          public LongValueFacetCounts(String field,
                                      IndexReader reader,
                                      boolean multiValued)
                               throws IOException

      Counts all facet values for this reader. This produces the same result as computing facets on a `MatchAllDocsQuery`, but is more efficient.
      Throws:
        `IOException`

    - #### LongValueFacetCounts

          public LongValueFacetCounts(String field,
                                      LongValuesSource valueSource,
                                      IndexReader reader)
                               throws IOException

      Counts all facet values for the provided `LongValuesSource`. This produces the same result as computing facets on a `MatchAllDocsQuery`, but is more efficient.
      Throws:
        `IOException`

  - ### Method Detail

    - #### getTopChildren

          public FacetResult getTopChildren(int topN,
                                            String dim,
                                            String... path)

      Description copied from class: `Facets`
      Returns the topN child labels under the specified path. Returns null if the specified path doesn't exist or if this dimension was never seen.
      Specified by:
        `getTopChildren` in class `Facets`

    - #### getTopChildrenSortByCount

          public FacetResult getTopChildrenSortByCount(int topN)

      Returns the specified top number of facets, sorted by count.

    - #### getAllChildrenSortByValue

          public FacetResult getAllChildrenSortByValue()

      Returns all unique values seen, sorted by value.

    - #### getSpecificValue

          public Number getSpecificValue(String dim,
                                         String... path)
                                  throws IOException

      Description copied from class: `Facets`
      Return the count or value for a specific path. Returns -1 if this path doesn't exist, else the count.
      Specified by:
        `getSpecificValue` in class `Facets`
      Throws:
        `IOException`

    - #### getAllDims

          public List<FacetResult> getAllDims(int topN)
                                       throws IOException

      Description copied from class: `Facets`
      Returns topN labels for any dimension that had hits, sorted by the number of hits that dimension matched; this is used for "sparse" faceting, where many different dimensions were indexed, for example depending on the type of document.
      Specified by:
        `getAllDims` in class `Facets`
      Throws:
        `IOException`

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

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