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org.apache.lucene.analysis.snowball.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.
 */

/**
 * {@link org.apache.lucene.analysis.TokenFilter} and {@link
 * org.apache.lucene.analysis.Analyzer} implementations that use Snowball
 * stemmers.
 * 

 * This project provides pre-compiled version of the Snowball stemmers
 * based on revision 500 of the Tartarus Snowball repository,
 * together with classes integrating them with the Lucene search engine.
 * 
 * 

 * A few changes has been made to the static Snowball code and compiled stemmers:
 * 
 * 

 *   
Class SnowballProgram is made abstract and contains new abstract method stem() to avoid reflection in Lucene filter class SnowballFilter.
 *   
All use of StringBuffers has been refactored to StringBuilder for speed.
 *   
Snowball BSD license header has been added to the Java classes to avoid having RAT adding ASL headers.
 * 
 * 

 * See the Snowball home page for more information about the algorithms.
 * 
 * 
 * 

 * IMPORTANT NOTICE ON BACKWARDS COMPATIBILITY!
 * 
 * 

 * An index created using the Snowball module in Lucene 2.3.2 and below
 * might not be compatible with the Snowball module in Lucene 2.4 or greater.
 * 
 * 

 * For more information about this issue see:
 * https://issues.apache.org/jira/browse/LUCENE-1142
 * 
 */
package org.apache.lucene.analysis.snowball;