## Uses of Class
org.apache.lucene.facet.Facets

- Packages that use Facets
  Package | Description
  --- | ---
  org.apache.lucene.facet | Faceted search.
  org.apache.lucene.facet.range | Provides range faceting capabilities.
  org.apache.lucene.facet.sortedset | Provides faceting capabilities over facets that were indexed with `SortedSetDocValuesFacetField`.
  org.apache.lucene.facet.taxonomy | Taxonomy of Categories.

- - ### Uses of Facets in org.apache.lucene.facet

    Subclasses of Facets in org.apache.lucene.facet
    Modifier and Type | Class and Description
    --- | ---
    `class` | `LongValueFacetCounts` `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.
    `class` | `MultiFacets` Maps specified dims to provided Facets impls; else, uses the default Facets impl.

    Fields in org.apache.lucene.facet declared as Facets
    Modifier and Type | Field and Description
    --- | ---
    `Facets` | DrillSideways.DrillSidewaysResult.`facets` Combined drill down and sideways results.

    Methods in org.apache.lucene.facet that return Facets
    Modifier and Type | Method and Description
    --- | ---
    `protected Facets` | DrillSideways.`buildFacetsResult(FacetsCollector drillDowns, FacetsCollector[] drillSideways, String[] drillSidewaysDims)` Subclass can override to customize per-dim Facets impl.

    Constructors in org.apache.lucene.facet with parameters of type Facets
    Constructor and Description
    `DrillSidewaysResult(Facets facets, TopDocs hits)` Sole constructor.
    `MultiFacets(Map<String,Facets> dimToFacets, Facets defaultFacets)` Create this, with the specified default `Facets` for fields not included in `dimToFacets`.

    Constructor parameters in org.apache.lucene.facet with type arguments of type Facets
    Constructor and Description
    `MultiFacets(Map<String,Facets> dimToFacets)` Create this, with no default `Facets`.
    `MultiFacets(Map<String,Facets> dimToFacets, Facets defaultFacets)` Create this, with the specified default `Facets` for fields not included in `dimToFacets`.

  - ### Uses of Facets in org.apache.lucene.facet.range

    Subclasses of Facets in org.apache.lucene.facet.range
    Modifier and Type | Class and Description
    --- | ---
    `class` | `DoubleRangeFacetCounts` `Facets` implementation that computes counts for dynamic double ranges from a provided `DoubleValuesSource`.
    `class` | `LongRangeFacetCounts` `Facets` implementation that computes counts for dynamic long ranges from a provided `LongValuesSource`.

  - ### Uses of Facets in org.apache.lucene.facet.sortedset

    Subclasses of Facets in org.apache.lucene.facet.sortedset
    Modifier and Type | Class and Description
    --- | ---
    `class` | `ConcurrentSortedSetDocValuesFacetCounts` Like `SortedSetDocValuesFacetCounts`, but aggregates counts concurrently across segments.
    `class` | `SortedSetDocValuesFacetCounts` Compute facets counts from previously indexed `SortedSetDocValuesFacetField`, without require a separate taxonomy index.

  - ### Uses of Facets in org.apache.lucene.facet.taxonomy

    Subclasses of Facets in org.apache.lucene.facet.taxonomy
    Modifier and Type | Class and Description
    --- | ---
    `class` | `FastTaxonomyFacetCounts` Computes facets counts, assuming the default encoding into DocValues was used.
    `class` | `FloatTaxonomyFacets` Base class for all taxonomy-based facets that aggregate to a per-ords float[].
    `class` | `IntTaxonomyFacets` Base class for all taxonomy-based facets that aggregate to a per-ords int[].
    `class` | `TaxonomyFacetCounts` Reads from any `OrdinalsReader`; use `FastTaxonomyFacetCounts` if you are using the default encoding from `BinaryDocValues`.
    `class` | `TaxonomyFacets` Base class for all taxonomy-based facets impls.
    `class` | `TaxonomyFacetSumFloatAssociations` Aggregates sum of int values previously indexed with `FloatAssociationFacetField`, assuming the default encoding.
    `class` | `TaxonomyFacetSumIntAssociations` Aggregates sum of int values previously indexed with `IntAssociationFacetField`, assuming the default encoding.
    `class` | `TaxonomyFacetSumValueSource` Aggregates sum of values from `DoubleValues.doubleValue()`, for each facet label.

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