org.apache.lucene.facet.taxonomy

## Class TaxonomyFacets

- java.lang.Object
- - org.apache.lucene.facet.Facets
  - - org.apache.lucene.facet.taxonomy.TaxonomyFacets

- Direct Known Subclasses:
    FloatTaxonomyFacets, IntTaxonomyFacets

      public abstract class TaxonomyFacets
      extends Facets

  Base class for all taxonomy-based facets impls.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected FacetsConfig` | `config` `FacetsConfig` provided to the constructor.
    `protected String` | `indexFieldName` Index field name provided to the constructor.
    `protected int[]` | `parents` Maps an ordinal to its parent, or -1 if there is no parent (root node).
    `protected TaxonomyReader` | `taxoReader` `TaxonomyReader` provided to the constructor.

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `TaxonomyFacets(String indexFieldName, TaxonomyReader taxoReader, FacetsConfig config)` Sole constructor.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `childrenLoaded()` Returns true if the (costly, and lazily initialized) children int[] was initialized.
    `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.
    `protected int[]` | `getChildren()` Returns int[] mapping each ordinal to its first child; this is a large array and is computed (and then saved) the first time this method is invoked.
    `protected int[]` | `getSiblings()` Returns int[] mapping each ordinal to its next sibling; this is a large array and is computed (and then saved) the first time this method is invoked.
    `boolean` | `siblingsLoaded()` Returns true if the (costly, and lazily initialized) sibling int[] was initialized.
    `protected FacetsConfig.DimConfig` | `verifyDim(String dim)` Throws `IllegalArgumentException` if the dimension is not recognized.

    - ### Methods inherited from class org.apache.lucene.facet.Facets

      `getSpecificValue, getTopChildren`

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

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

- - ### Field Detail

    - #### indexFieldName

          protected final String indexFieldName

      Index field name provided to the constructor.

    - #### taxoReader

          protected final TaxonomyReader taxoReader

      `TaxonomyReader` provided to the constructor.

    - #### config

          protected final FacetsConfig config

      `FacetsConfig` provided to the constructor.

    - #### parents

          protected final int[] parents

      Maps an ordinal to its parent, or -1 if there is no parent (root node).

  - ### Constructor Detail

    - #### TaxonomyFacets

          protected TaxonomyFacets(String indexFieldName,
                                   TaxonomyReader taxoReader,
                                   FacetsConfig config)
                            throws IOException

      Sole constructor.
      Throws:
        `IOException`

  - ### Method Detail

    - #### getChildren

          protected int[] getChildren()
                               throws IOException

      Returns int[] mapping each ordinal to its first child; this is a large array and is computed (and then saved) the first time this method is invoked.
      Throws:
        `IOException`

    - #### getSiblings

          protected int[] getSiblings()
                               throws IOException

      Returns int[] mapping each ordinal to its next sibling; this is a large array and is computed (and then saved) the first time this method is invoked.
      Throws:
        `IOException`

    - #### childrenLoaded

          public boolean childrenLoaded()

      Returns true if the (costly, and lazily initialized) children int[] was initialized.
      WARNING: This API is experimental and might change in incompatible ways in the next release.

    - #### siblingsLoaded

          public boolean siblingsLoaded()

      Returns true if the (costly, and lazily initialized) sibling int[] was initialized.
      WARNING: This API is experimental and might change in incompatible ways in the next release.

    - #### verifyDim

          protected FacetsConfig.DimConfig verifyDim(String dim)

      Throws `IllegalArgumentException` if the dimension is not recognized. Otherwise, returns the `FacetsConfig.DimConfig` for this dimension.

    - #### 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`

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