# Uses of Package
org.apache.lucene.facet.taxonomy.directory

- Packages that use org.apache.lucene.facet.taxonomy.directory
  Package | Description
  --- | ---
  org.apache.lucene.facet.taxonomy | Taxonomy of Categories
  org.apache.lucene.facet.taxonomy.directory | Taxonomy index implementation using on top of a Directory.
  org.apache.lucene.facet.util | Various utilities for faceted search

- Classes in org.apache.lucene.facet.taxonomy.directory used by org.apache.lucene.facet.taxonomy
  Class and Description
  ParallelTaxonomyArrays Returns 3 arrays for traversing the taxonomy: `parents`: `parents[i]` denotes the parent of category ordinal `i`. `children`: `children[i]` denotes the youngest child of category ordinal `i`.

- Classes in org.apache.lucene.facet.taxonomy.directory used by org.apache.lucene.facet.taxonomy.directory
  Class and Description
  DirectoryTaxonomyReader A `TaxonomyReader` which retrieves stored taxonomy information from a `Directory`.
  DirectoryTaxonomyWriter `TaxonomyWriter` which uses a `Directory` to store the taxonomy information on disk, and keeps an additional in-memory cache of some or all categories.
  DirectoryTaxonomyWriter.OrdinalMap Mapping from old ordinal to new ordinals, used when merging indexes wit separate taxonomies.
  ParallelTaxonomyArrays Returns 3 arrays for traversing the taxonomy: `parents`: `parents[i]` denotes the parent of category ordinal `i`. `children`: `children[i]` denotes the youngest child of category ordinal `i`.

- Classes in org.apache.lucene.facet.taxonomy.directory used by org.apache.lucene.facet.util
  Class and Description
  DirectoryTaxonomyWriter `TaxonomyWriter` which uses a `Directory` to store the taxonomy information on disk, and keeps an additional in-memory cache of some or all categories.
  DirectoryTaxonomyWriter.OrdinalMap Mapping from old ordinal to new ordinals, used when merging indexes wit separate taxonomies.

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