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org.apache.lucene.facet.taxonomy.package-info Maven / Gradle / Ivy

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Taxonomy of Categories.
 *
 * 
Facets are defined using a hierarchy of categories, known as a Taxonomy. For example,
 * the taxonomy of a book store application might have the following structure:
 *
 * 

 *   
Author
 *       

 *         
Mark Twain
 *         
J. K. Rowling
 *       
 * 
 *
 * 

 *   
Date
 *       

 *         
2010
 *       
 *       

 *         
March
 *         
April
 *       
 *   
2009
 * 
 *
 * 
The Taxonomy translates category-paths into integer identifiers (often termed
 * ordinals) and vice versa. The category Author/Mark Twain adds two nodes to
 * the taxonomy: Author and Author/Mark Twain, each is assigned a
 * different ordinal. The taxonomy maintains the invariant that a node always has an ordinal that is
 * < all its children.
 */
package org.apache.lucene.facet.taxonomy;