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## org.apache.lucene.facet.search
Class FacetsAccumulator

    java.lang.Object
      org.apache.lucene.facet.search.FacetsAccumulator

Direct Known Subclasses:
  SortedSetDocValuesAccumulator, StandardFacetsAccumulator

    public class FacetsAccumulator

extends Object

Driver for Accumulating facets of faceted search requests over given documents.

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

Field Summary
`FacetArrays` | `facetArrays`
`IndexReader` | `indexReader`
`FacetSearchParams` | `searchParams`
`TaxonomyReader` | `taxonomyReader`

Constructor Summary
`FacetsAccumulator(FacetSearchParams searchParams, IndexReader indexReader, TaxonomyReader taxonomyReader)` Initializes the accumulator with the given search params, index reader and taxonomy reader.
`FacetsAccumulator(FacetSearchParams searchParams, IndexReader indexReader, TaxonomyReader taxonomyReader, FacetArrays facetArrays)` Initializes the accumulator with the given parameters as well as `FacetArrays`.

Method Summary
`List<FacetResult>` | `accumulate(List<FacetsCollector.MatchingDocs> matchingDocs)` Used by `FacetsCollector` to build the list of `facet results` that match the `facet requests` that were given in the constructor.
`static FacetsAccumulator` | `create(FacetSearchParams fsp, IndexReader indexReader, TaxonomyReader taxoReader)` Creates an appropriate `FacetsAccumulator`, returning `FacetsAccumulator` when all requests are `CountFacetRequest` and only one partition is in use, otherwise `StandardFacetsAccumulator`.
`protected FacetResultsHandler` | `createFacetResultsHandler(FacetRequest fr)` Creates a `FacetResultsHandler` that matches the given `FacetRequest`.
`protected static FacetResult` | `emptyResult(int ordinal, FacetRequest fr)` Returns an empty `FacetResult`.
`FacetsAggregator` | `getAggregator()` Returns the `FacetsAggregator` to use for aggregating the categories found in the result documents.
`protected Set<CategoryListParams>` | `getCategoryLists()`

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

Field Detail

### taxonomyReader

    public final TaxonomyReader taxonomyReader

### indexReader

    public final IndexReader indexReader

### facetArrays

    public final FacetArrays facetArrays

### searchParams

    public FacetSearchParams searchParams

Constructor Detail

### FacetsAccumulator

    public FacetsAccumulator(FacetSearchParams searchParams,
                             IndexReader indexReader,
                             TaxonomyReader taxonomyReader)

  Initializes the accumulator with the given search params, index reader and taxonomy reader. This constructor creates the default `FacetArrays`, which do not support reuse. If you want to use `ReusingFacetArrays`, you should use the `FacetsAccumulator(FacetSearchParams, IndexReader, TaxonomyReader, FacetArrays)` constructor.

### FacetsAccumulator

    public FacetsAccumulator(FacetSearchParams searchParams,
                             IndexReader indexReader,
                             TaxonomyReader taxonomyReader,
                             FacetArrays facetArrays)

  Initializes the accumulator with the given parameters as well as `FacetArrays`. Note that the accumulator doesn't call `FacetArrays.free()`. If you require that (only makes sense if you use `ReusingFacetArrays`, you should do it after you've finished with the accumulator.

Method Detail

### create

    public static FacetsAccumulator create(FacetSearchParams fsp,
                                           IndexReader indexReader,
                                           TaxonomyReader taxoReader)

  Creates an appropriate `FacetsAccumulator`, returning `FacetsAccumulator` when all requests are `CountFacetRequest` and only one partition is in use, otherwise `StandardFacetsAccumulator`.

### emptyResult

    protected static FacetResult emptyResult(int ordinal,
                                             FacetRequest fr)

  Returns an empty `FacetResult`.

### getAggregator

    public FacetsAggregator getAggregator()

  Returns the `FacetsAggregator` to use for aggregating the categories found in the result documents. The default implementation returns `CountingFacetsAggregator`, or `FastCountingFacetsAggregator` if all categories can be decoded with `DGapVInt8IntDecoder`.

### createFacetResultsHandler

    protected FacetResultsHandler createFacetResultsHandler(FacetRequest fr)

  Creates a `FacetResultsHandler` that matches the given `FacetRequest`.

### getCategoryLists

    protected Set<CategoryListParams> getCategoryLists()

### accumulate

    public List<FacetResult> accumulate(List<FacetsCollector.MatchingDocs> matchingDocs)
                                 throws IOException

  Used by `FacetsCollector` to build the list of `facet results` that match the `facet requests` that were given in the constructor.

  Parameters:
    `matchingDocs` - the documents that matched the query, per-segment.
  Throws:
    `IOException`

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