# Lucene 4.2.1 facet API

Provides faceted indexing and search capabilities (checkout the userguide).

See:
Description

Packages
org.apache.lucene.facet: faceted search
org.apache.lucene.facet.associations: Allows associating arbitrary values with a category.
org.apache.lucene.facet.codecs.facet42: Codec + DocValuesFormat that are optimized for facets.
org.apache.lucene.facet.collections: Various optimized Collections implementations.
org.apache.lucene.facet.complements: Allows to cache the total counts of categories, so that during search which returns a large number of results (>60% of segment size), the complement set of matching documents is counted.
org.apache.lucene.facet.encoding: Offers various encoders and decoders for category ordinals.
org.apache.lucene.facet.index: Facets indexing code.
org.apache.lucene.facet.params: Facets indexing and search parameters.
org.apache.lucene.facet.partitions: Category Partitions
org.apache.lucene.facet.sampling: Facets sampling.
org.apache.lucene.facet.search: Facets search code.
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.taxonomy.writercache: Improves indexing time by caching a map of CategoryPath to their Ordinal.
org.apache.lucene.facet.taxonomy.writercache.cl2o: Category->Ordinal caching implementation using an optimized data-structures
org.apache.lucene.facet.taxonomy.writercache.lru: An LRU cache implementation for the CategoryPath to Ordinal map
org.apache.lucene.facet.util: Various utilities for faceted search

Provides faceted indexing and search capabilities (checkout the userguide).

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