Java tutorial
/** * FreeDesktopSearch - A Search Engine for your Desktop * Copyright (C) 2013 Mirko Sertic * * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public * License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along with this program; if not, see <http://www.gnu.org/licenses/>. */ package de.mirkosertic.desktopsearch; import org.apache.lucene.analysis.Analyzer; import org.apache.lucene.analysis.ar.ArabicAnalyzer; import org.apache.lucene.analysis.bg.BulgarianAnalyzer; import org.apache.lucene.analysis.br.BrazilianAnalyzer; import org.apache.lucene.analysis.ca.CatalanAnalyzer; import org.apache.lucene.analysis.ckb.SoraniAnalyzer; import org.apache.lucene.analysis.cz.CzechAnalyzer; import org.apache.lucene.analysis.da.DanishAnalyzer; import org.apache.lucene.analysis.de.GermanAnalyzer; import org.apache.lucene.analysis.el.GreekAnalyzer; import org.apache.lucene.analysis.en.EnglishAnalyzer; import org.apache.lucene.analysis.es.SpanishAnalyzer; import org.apache.lucene.analysis.eu.BasqueAnalyzer; import org.apache.lucene.analysis.fa.PersianAnalyzer; import org.apache.lucene.analysis.fi.FinnishAnalyzer; import org.apache.lucene.analysis.fr.FrenchAnalyzer; import org.apache.lucene.analysis.ga.IrishAnalyzer; import org.apache.lucene.analysis.gl.GalicianAnalyzer; import org.apache.lucene.analysis.hi.HindiAnalyzer; import org.apache.lucene.analysis.hu.HungarianAnalyzer; import org.apache.lucene.analysis.hy.ArmenianAnalyzer; import org.apache.lucene.analysis.id.IndonesianAnalyzer; import org.apache.lucene.analysis.it.ItalianAnalyzer; import org.apache.lucene.analysis.lv.LatvianAnalyzer; import org.apache.lucene.analysis.miscellaneous.PerFieldAnalyzerWrapper; import org.apache.lucene.analysis.nl.DutchAnalyzer; import org.apache.lucene.analysis.no.NorwegianAnalyzer; import org.apache.lucene.analysis.pt.PortugueseAnalyzer; import org.apache.lucene.analysis.ro.RomanianAnalyzer; import org.apache.lucene.analysis.ru.RussianAnalyzer; import org.apache.lucene.analysis.standard.StandardAnalyzer; import org.apache.lucene.analysis.sv.SwedishAnalyzer; import org.apache.lucene.analysis.th.ThaiAnalyzer; import org.apache.lucene.analysis.tr.TurkishAnalyzer; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; class AnalyzerCache { private static final String FIELD_PREFIX = IndexFields.CONTENT + "_"; private final Map<SupportedLanguage, Analyzer> analyzerByLanguage; private final Analyzer standardAnalyzer; private static Analyzer configure(Analyzer aAnalyzer) { aAnalyzer.setVersion(IndexFields.LUCENE_VERSION); return aAnalyzer; } public AnalyzerCache(Configuration aConfiguration) { standardAnalyzer = configure(new StandardAnalyzer()); analyzerByLanguage = new HashMap<>(); registerIfEnabled(SupportedLanguage.ar, aConfiguration, configure(new ArabicAnalyzer())); registerIfEnabled(SupportedLanguage.bg, aConfiguration, configure(new BulgarianAnalyzer())); registerIfEnabled(SupportedLanguage.br, aConfiguration, configure(new BrazilianAnalyzer())); registerIfEnabled(SupportedLanguage.ca, aConfiguration, configure(new CatalanAnalyzer())); registerIfEnabled(SupportedLanguage.ckb, aConfiguration, configure(new SoraniAnalyzer())); registerIfEnabled(SupportedLanguage.cz, aConfiguration, configure(new CzechAnalyzer())); registerIfEnabled(SupportedLanguage.da, aConfiguration, configure(new DanishAnalyzer())); registerIfEnabled(SupportedLanguage.de, aConfiguration, configure(new GermanAnalyzer())); registerIfEnabled(SupportedLanguage.el, aConfiguration, configure(new GreekAnalyzer())); registerIfEnabled(SupportedLanguage.en, aConfiguration, configure(new EnglishAnalyzer())); registerIfEnabled(SupportedLanguage.es, aConfiguration, configure(new SpanishAnalyzer())); registerIfEnabled(SupportedLanguage.eu, aConfiguration, configure(new BasqueAnalyzer())); registerIfEnabled(SupportedLanguage.fa, aConfiguration, configure(new PersianAnalyzer())); registerIfEnabled(SupportedLanguage.fi, aConfiguration, configure(new FinnishAnalyzer())); registerIfEnabled(SupportedLanguage.fr, aConfiguration, configure(new FrenchAnalyzer())); registerIfEnabled(SupportedLanguage.ga, aConfiguration, configure(new IrishAnalyzer())); registerIfEnabled(SupportedLanguage.gl, aConfiguration, configure(new GalicianAnalyzer())); registerIfEnabled(SupportedLanguage.hi, aConfiguration, configure(new HindiAnalyzer())); registerIfEnabled(SupportedLanguage.hu, aConfiguration, configure(new HungarianAnalyzer())); registerIfEnabled(SupportedLanguage.hy, aConfiguration, configure(new ArmenianAnalyzer())); registerIfEnabled(SupportedLanguage.id, aConfiguration, configure(new IndonesianAnalyzer())); registerIfEnabled(SupportedLanguage.it, aConfiguration, configure(new ItalianAnalyzer())); registerIfEnabled(SupportedLanguage.lv, aConfiguration, configure(new LatvianAnalyzer())); registerIfEnabled(SupportedLanguage.nl, aConfiguration, configure(new DutchAnalyzer())); registerIfEnabled(SupportedLanguage.no, aConfiguration, configure(new NorwegianAnalyzer())); registerIfEnabled(SupportedLanguage.pt, aConfiguration, configure(new PortugueseAnalyzer())); registerIfEnabled(SupportedLanguage.ro, aConfiguration, configure(new RomanianAnalyzer())); registerIfEnabled(SupportedLanguage.ru, aConfiguration, configure(new RussianAnalyzer())); registerIfEnabled(SupportedLanguage.sv, aConfiguration, configure(new SwedishAnalyzer())); registerIfEnabled(SupportedLanguage.th, aConfiguration, configure(new ThaiAnalyzer())); registerIfEnabled(SupportedLanguage.tr, aConfiguration, configure(new TurkishAnalyzer())); } private void registerIfEnabled(SupportedLanguage aLanguage, Configuration aConfiguration, Analyzer aAnalyzer) { if (aConfiguration.getEnabledLanguages().contains(aLanguage)) { analyzerByLanguage.put(aLanguage, aAnalyzer); } } public String getFieldNameFor(SupportedLanguage aLanguage) { return FIELD_PREFIX + aLanguage.name(); } public Analyzer getAnalyzer() { Map<String, Analyzer> theFieldAnalyzer = new HashMap<>(); analyzerByLanguage.entrySet().stream() .forEach(e -> theFieldAnalyzer.put(getFieldNameFor(e.getKey()), e.getValue())); return new PerFieldAnalyzerWrapper(standardAnalyzer, theFieldAnalyzer); } public boolean supportsLanguage(SupportedLanguage aLanguage) { return analyzerByLanguage.containsKey(aLanguage); } public String[] getAllFieldNames() { List<String> theFieldNames = new ArrayList<>(); theFieldNames.add(IndexFields.CONTENT); analyzerByLanguage.entrySet().stream().forEach(e -> theFieldNames.add(getFieldNameFor(e.getKey()))); return theFieldNames.toArray(new String[theFieldNames.size()]); } }