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

Taxonomy index implementation using on top of a Directory.

See:
Description

Interface Summary
DirectoryTaxonomyWriter.OrdinalMap: Mapping from old ordinal to new ordinals, used when merging indexes wit separate taxonomies.

Class Summary
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.DiskOrdinalMap: `DirectoryTaxonomyWriter.OrdinalMap` maintained on file system
DirectoryTaxonomyWriter.MemoryOrdinalMap: `DirectoryTaxonomyWriter.OrdinalMap` maintained in memory
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`.

## Package org.apache.lucene.facet.taxonomy.directory Description

Taxonomy index implementation using on top of a Directory.

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