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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.
*/
package org.elasticsearch.index.analysis;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.ar.ArabicStemFilter;
import org.apache.lucene.analysis.bg.BulgarianStemFilter;
import org.apache.lucene.analysis.br.BrazilianStemFilter;
import org.apache.lucene.analysis.ckb.SoraniStemFilter;
import org.apache.lucene.analysis.cz.CzechStemFilter;
import org.apache.lucene.analysis.de.GermanLightStemFilter;
import org.apache.lucene.analysis.de.GermanMinimalStemFilter;
import org.apache.lucene.analysis.el.GreekStemFilter;
import org.apache.lucene.analysis.en.EnglishMinimalStemFilter;
import org.apache.lucene.analysis.en.EnglishPossessiveFilter;
import org.apache.lucene.analysis.en.KStemFilter;
import org.apache.lucene.analysis.en.PorterStemFilter;
import org.apache.lucene.analysis.es.SpanishLightStemFilter;
import org.apache.lucene.analysis.fi.FinnishLightStemFilter;
import org.apache.lucene.analysis.fr.FrenchLightStemFilter;
import org.apache.lucene.analysis.fr.FrenchMinimalStemFilter;
import org.apache.lucene.analysis.gl.GalicianMinimalStemFilter;
import org.apache.lucene.analysis.gl.GalicianStemFilter;
import org.apache.lucene.analysis.hi.HindiStemFilter;
import org.apache.lucene.analysis.hu.HungarianLightStemFilter;
import org.apache.lucene.analysis.id.IndonesianStemFilter;
import org.apache.lucene.analysis.it.ItalianLightStemFilter;
import org.apache.lucene.analysis.lv.LatvianStemFilter;
import org.apache.lucene.analysis.no.NorwegianLightStemFilter;
import org.apache.lucene.analysis.no.NorwegianLightStemmer;
import org.apache.lucene.analysis.no.NorwegianMinimalStemFilter;
import org.apache.lucene.analysis.pt.PortugueseLightStemFilter;
import org.apache.lucene.analysis.pt.PortugueseMinimalStemFilter;
import org.apache.lucene.analysis.pt.PortugueseStemFilter;
import org.apache.lucene.analysis.ru.RussianLightStemFilter;
import org.apache.lucene.analysis.snowball.SnowballFilter;
import org.apache.lucene.analysis.sv.SwedishLightStemFilter;
import org.elasticsearch.Version;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.index.IndexSettings;
import org.tartarus.snowball.ext.ArmenianStemmer;
import org.tartarus.snowball.ext.BasqueStemmer;
import org.tartarus.snowball.ext.CatalanStemmer;
import org.tartarus.snowball.ext.DanishStemmer;
import org.tartarus.snowball.ext.DutchStemmer;
import org.tartarus.snowball.ext.EnglishStemmer;
import org.tartarus.snowball.ext.FinnishStemmer;
import org.tartarus.snowball.ext.FrenchStemmer;
import org.tartarus.snowball.ext.German2Stemmer;
import org.tartarus.snowball.ext.GermanStemmer;
import org.tartarus.snowball.ext.HungarianStemmer;
import org.tartarus.snowball.ext.IrishStemmer;
import org.tartarus.snowball.ext.ItalianStemmer;
import org.tartarus.snowball.ext.KpStemmer;
import org.tartarus.snowball.ext.LithuanianStemmer;
import org.tartarus.snowball.ext.LovinsStemmer;
import org.tartarus.snowball.ext.NorwegianStemmer;
import org.tartarus.snowball.ext.PorterStemmer;
import org.tartarus.snowball.ext.PortugueseStemmer;
import org.tartarus.snowball.ext.RomanianStemmer;
import org.tartarus.snowball.ext.RussianStemmer;
import org.tartarus.snowball.ext.SpanishStemmer;
import org.tartarus.snowball.ext.SwedishStemmer;
import org.tartarus.snowball.ext.TurkishStemmer;
public class StemmerTokenFilterFactory extends AbstractTokenFilterFactory {
private String language;
public StemmerTokenFilterFactory(IndexSettings indexSettings, Environment environment, String name, Settings settings) {
super(indexSettings, name, settings);
this.language = Strings.capitalize(settings.get("language", settings.get("name", "porter")));
}
@Override
public TokenStream create(TokenStream tokenStream) {
final Version indexVersion = indexSettings.getIndexVersionCreated();
if ("arabic".equalsIgnoreCase(language)) {
return new ArabicStemFilter(tokenStream);
} else if ("armenian".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new ArmenianStemmer());
} else if ("basque".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new BasqueStemmer());
} else if ("brazilian".equalsIgnoreCase(language)) {
return new BrazilianStemFilter(tokenStream);
} else if ("bulgarian".equalsIgnoreCase(language)) {
return new BulgarianStemFilter(tokenStream);
} else if ("catalan".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new CatalanStemmer());
} else if ("czech".equalsIgnoreCase(language)) {
return new CzechStemFilter(tokenStream);
} else if ("danish".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new DanishStemmer());
// Dutch stemmers
} else if ("dutch".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new DutchStemmer());
} else if ("dutch_kp".equalsIgnoreCase(language) || "dutchKp".equalsIgnoreCase(language) || "kp".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new KpStemmer());
// English stemmers
} else if ("english".equalsIgnoreCase(language)) {
return new PorterStemFilter(tokenStream);
} else if ("light_english".equalsIgnoreCase(language) || "lightEnglish".equalsIgnoreCase(language)
|| "kstem".equalsIgnoreCase(language)) {
return new KStemFilter(tokenStream);
} else if ("lovins".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new LovinsStemmer());
} else if ("porter".equalsIgnoreCase(language)) {
return new PorterStemFilter(tokenStream);
} else if ("porter2".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new EnglishStemmer());
} else if ("minimal_english".equalsIgnoreCase(language) || "minimalEnglish".equalsIgnoreCase(language)) {
return new EnglishMinimalStemFilter(tokenStream);
} else if ("possessive_english".equalsIgnoreCase(language) || "possessiveEnglish".equalsIgnoreCase(language)) {
return new EnglishPossessiveFilter(tokenStream);
// Finnish stemmers
} else if ("finnish".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new FinnishStemmer());
} else if ("light_finish".equalsIgnoreCase(language) || "lightFinish".equalsIgnoreCase(language)) {
// leaving this for backward compatibility
return new FinnishLightStemFilter(tokenStream);
} else if ("light_finnish".equalsIgnoreCase(language) || "lightFinnish".equalsIgnoreCase(language)) {
return new FinnishLightStemFilter(tokenStream);
// French stemmers
} else if ("french".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new FrenchStemmer());
} else if ("light_french".equalsIgnoreCase(language) || "lightFrench".equalsIgnoreCase(language)) {
return new FrenchLightStemFilter(tokenStream);
} else if ("minimal_french".equalsIgnoreCase(language) || "minimalFrench".equalsIgnoreCase(language)) {
return new FrenchMinimalStemFilter(tokenStream);
// Galician stemmers
} else if ("galician".equalsIgnoreCase(language)) {
return new GalicianStemFilter(tokenStream);
} else if ("minimal_galician".equalsIgnoreCase(language)) {
return new GalicianMinimalStemFilter(tokenStream);
// German stemmers
} else if ("german".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new GermanStemmer());
} else if ("german2".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new German2Stemmer());
} else if ("light_german".equalsIgnoreCase(language) || "lightGerman".equalsIgnoreCase(language)) {
return new GermanLightStemFilter(tokenStream);
} else if ("minimal_german".equalsIgnoreCase(language) || "minimalGerman".equalsIgnoreCase(language)) {
return new GermanMinimalStemFilter(tokenStream);
} else if ("greek".equalsIgnoreCase(language)) {
return new GreekStemFilter(tokenStream);
} else if ("hindi".equalsIgnoreCase(language)) {
return new HindiStemFilter(tokenStream);
// Hungarian stemmers
} else if ("hungarian".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new HungarianStemmer());
} else if ("light_hungarian".equalsIgnoreCase(language) || "lightHungarian".equalsIgnoreCase(language)) {
return new HungarianLightStemFilter(tokenStream);
} else if ("indonesian".equalsIgnoreCase(language)) {
return new IndonesianStemFilter(tokenStream);
// Irish stemmer
} else if ("irish".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new IrishStemmer());
// Italian stemmers
} else if ("italian".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new ItalianStemmer());
} else if ("light_italian".equalsIgnoreCase(language) || "lightItalian".equalsIgnoreCase(language)) {
return new ItalianLightStemFilter(tokenStream);
} else if ("latvian".equalsIgnoreCase(language)) {
return new LatvianStemFilter(tokenStream);
} else if ("lithuanian".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new LithuanianStemmer());
// Norwegian (Bokmål) stemmers
} else if ("norwegian".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new NorwegianStemmer());
} else if ("light_norwegian".equalsIgnoreCase(language) || "lightNorwegian".equalsIgnoreCase(language)) {
return new NorwegianLightStemFilter(tokenStream);
} else if ("minimal_norwegian".equalsIgnoreCase(language) || "minimalNorwegian".equals(language)) {
return new NorwegianMinimalStemFilter(tokenStream);
// Norwegian (Nynorsk) stemmers
} else if ("light_nynorsk".equalsIgnoreCase(language) || "lightNynorsk".equalsIgnoreCase(language)) {
return new NorwegianLightStemFilter(tokenStream, NorwegianLightStemmer.NYNORSK);
} else if ("minimal_nynorsk".equalsIgnoreCase(language) || "minimalNynorsk".equalsIgnoreCase(language)) {
return new NorwegianMinimalStemFilter(tokenStream, NorwegianLightStemmer.NYNORSK);
// Portuguese stemmers
} else if ("portuguese".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new PortugueseStemmer());
} else if ("light_portuguese".equalsIgnoreCase(language) || "lightPortuguese".equalsIgnoreCase(language)) {
return new PortugueseLightStemFilter(tokenStream);
} else if ("minimal_portuguese".equalsIgnoreCase(language) || "minimalPortuguese".equalsIgnoreCase(language)) {
return new PortugueseMinimalStemFilter(tokenStream);
} else if ("portuguese_rslp".equalsIgnoreCase(language)) {
return new PortugueseStemFilter(tokenStream);
} else if ("romanian".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new RomanianStemmer());
// Russian stemmers
} else if ("russian".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new RussianStemmer());
} else if ("light_russian".equalsIgnoreCase(language) || "lightRussian".equalsIgnoreCase(language)) {
return new RussianLightStemFilter(tokenStream);
// Spanish stemmers
} else if ("spanish".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new SpanishStemmer());
} else if ("light_spanish".equalsIgnoreCase(language) || "lightSpanish".equalsIgnoreCase(language)) {
return new SpanishLightStemFilter(tokenStream);
// Sorani Kurdish stemmer
} else if ("sorani".equalsIgnoreCase(language)) {
return new SoraniStemFilter(tokenStream);
// Swedish stemmers
} else if ("swedish".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new SwedishStemmer());
} else if ("light_swedish".equalsIgnoreCase(language) || "lightSwedish".equalsIgnoreCase(language)) {
return new SwedishLightStemFilter(tokenStream);
} else if ("turkish".equalsIgnoreCase(language)) {
return new SnowballFilter(tokenStream, new TurkishStemmer());
}
return new SnowballFilter(tokenStream, language);
}
}