Examples of org.apache.lucene.facet.search.TopKInEachNodeHandler

org.apache.lucene.facet.search.TopKInEachNodeHandler
Generates {@link FacetResult} from the {@link FacetArrays} aggregated for aparticular {@link FacetRequest}. The generated {@link FacetResult} is asubtree of the taxonomy tree. Its root node, {@link FacetResult#getFacetResultNode()}, is the facet specified by {@link FacetRequest#categoryPath}, and the enumerated children, {@link FacetResultNode#subResults}, of each node in that {@link FacetResult}are the top K ( = {@link FacetRequest#numResults}) among its children in the taxonomy. The depth (number of levels excluding the root) of the {@link FacetResult} tree is specified by {@link FacetRequest#getDepth()}.
Because the number of selected children of each node is restricted, and not the overall number of nodes in the {@link FacetResult}, facets not selected into {@link FacetResult} might have better values, or ordinals, (typically,higher counts), than facets that are selected into the {@link FacetResult}.
The generated {@link FacetResult} also provides with{@link FacetResult#getNumValidDescendants()}, which returns the total number of facets that are descendants of the root node, no deeper than {@link FacetRequest#getDepth()}, and which have valid value. The rootnode itself is not counted here. Valid value is determined by the {@link FacetResultsHandler}. {@link TopKInEachNodeHandler} defines valid as!= 0.
NOTE: this code relies on the assumption that {@link TaxonomyReader#INVALID_ORDINAL} == -1, a smaller value than any validordinal. @lucene.experimental

  }


  @Override
  public PartitionsFacetResultsHandler createFacetResultsHandler(FacetRequest fr, OrdinalValueResolver resolver) {
    if (fr.getResultMode() == ResultMode.PER_NODE_IN_TREE) {
      return new TopKInEachNodeHandler(taxonomyReader, fr, resolver, facetArrays);
    } else {
      return new TopKFacetResultsHandler(taxonomyReader, fr, resolver, facetArrays);
    }
  }

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   *        taxonomy size.
   */
  public FacetResultsHandler createFacetResultsHandler(TaxonomyReader taxonomyReader) {
    try {
      if (resultMode == ResultMode.PER_NODE_IN_TREE) {
        return new TopKInEachNodeHandler(taxonomyReader, (FacetRequest) clone());
      } 
      return new TopKFacetResultsHandler(taxonomyReader, (FacetRequest) clone());
    } catch (CloneNotSupportedException e) {
      // Shouldn't happen since we implement Cloneable. If it does happen, it is
      // probably because the class was changed to not implement Cloneable

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                return new FloatFacetResultsHandler(taxonomyReader, fr, facetArrays);
            }
        }


        if (fr.getResultMode() == ResultMode.PER_NODE_IN_TREE) {
            return new TopKInEachNodeHandler(taxonomyReader, fr, facetArrays);
        }
        return new TopKFacetResultsHandler(taxonomyReader, fr, facetArrays);
    }

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