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## org.apache.lucene.facet.search
Interface FacetsAggregator

All Known Implementing Classes:
  CachedOrdsCountingFacetsAggregator, CountingFacetsAggregator, FastCountingFacetsAggregator, IntRollupFacetsAggregator, MultiAssociationsFacetsAggregator, PerCategoryListAggregator, SumFloatAssociationFacetsAggregator, SumIntAssociationFacetsAggregator, SumScoreFacetsAggregator

    public interface FacetsAggregator

Aggregates categories that were found in result documents (specified by `FacetsCollector.MatchingDocs`). If the aggregator requires document scores too, it should return `true` from `requiresDocScores()`.

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

Method Summary
`void` | `aggregate(FacetsCollector.MatchingDocs matchingDocs, CategoryListParams clp, FacetArrays facetArrays)` Aggregate the facets found in the given matching documents.
`boolean` | `requiresDocScores()` Returns `true` if this aggregator requires document scores.
`void` | `rollupValues(FacetRequest fr, int ordinal, int[] children, int[] siblings, FacetArrays facetArrays)` Rollup the values of the given ordinal.

Method Detail

### aggregate

    void aggregate(FacetsCollector.MatchingDocs matchingDocs,
                   CategoryListParams clp,
                   FacetArrays facetArrays)
                   throws IOException

  Aggregate the facets found in the given matching documents.

  Throws:
    `IOException`

### rollupValues

    void rollupValues(FacetRequest fr,
                      int ordinal,
                      int[] children,
                      int[] siblings,
                      FacetArrays facetArrays)

  Rollup the values of the given ordinal. This method is called when a category was indexed with `CategoryListParams.OrdinalPolicy.NO_PARENTS`. The given ordinal is the requested category, and you should use the children and siblings arrays to traverse its sub-tree.

### requiresDocScores

    boolean requiresDocScores()

  Returns `true` if this aggregator requires document scores.

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