Class Summary
Class	Description
Cl2oTaxonomyWriterCache	`TaxonomyWriterCache` using `CompactLabelToOrdinal`.
CollisionMap	HashMap to store colliding labels.
CompactLabelToOrdinal	This is a very efficient LabelToOrdinal implementation that uses a CharBlockArray to store all labels and a configurable number of HashArrays to reference the labels.
LabelToOrdinal	Abstract class for storing Label->Ordinal mappings in a taxonomy.

Package org.apache.lucene.facet.taxonomy.writercache.cl2o Description

Category->Ordinal caching implementation using an optimized data-structures

The internal map data structure consumes less memory (~30%) and is faster (~50%) compared to a Java HashMap<String, Integer>.