home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Lucene example source code file (CatalanAnalyzer.java)

This example Lucene source code file (CatalanAnalyzer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

catalananalyzer, catalananalyzer, default_stop_set, default_stopword_file, default_stopword_file, io, ioexception, reader, set, set, stopfilter, stopwordanalyzerbase, tokenizer, tokenstreamcomponents, tokenstreamcomponents, util

The Lucene CatalanAnalyzer.java source code

package org.apache.lucene.analysis.ca;

 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

import java.io.IOException;
import java.io.Reader;
import java.util.Set;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.LowerCaseFilter;
import org.apache.lucene.analysis.StopFilter;
import org.apache.lucene.analysis.KeywordMarkerFilter;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.snowball.SnowballFilter;
import org.apache.lucene.analysis.standard.StandardFilter;
import org.apache.lucene.analysis.standard.StandardTokenizer;
import org.apache.lucene.analysis.CharArraySet;
import org.apache.lucene.analysis.StopwordAnalyzerBase;
import org.apache.lucene.util.Version;
import org.tartarus.snowball.ext.CatalanStemmer;

 * {@link Analyzer} for Catalan.
public final class CatalanAnalyzer extends StopwordAnalyzerBase {
  private final Set<?> stemExclusionSet;
  /** File containing default Catalan stopwords. */
  public final static String DEFAULT_STOPWORD_FILE = "stopwords.txt";
   * Returns an unmodifiable instance of the default stop words set.
   * @return default stop words set.
  public static Set<?> getDefaultStopSet(){
    return DefaultSetHolder.DEFAULT_STOP_SET;
   * Atomically loads the DEFAULT_STOP_SET in a lazy fashion once the outer class 
   * accesses the static final set the first time.;
  private static class DefaultSetHolder {
    static final Set<?> DEFAULT_STOP_SET;

    static {
      try {
        DEFAULT_STOP_SET = loadStopwordSet(false, 
            CatalanAnalyzer.class, DEFAULT_STOPWORD_FILE, "#");
      } catch (IOException ex) {
        // default set should always be present as it is part of the
        // distribution (JAR)
        throw new RuntimeException("Unable to load default stopword set");

   * Builds an analyzer with the default stop words: {@link #DEFAULT_STOPWORD_FILE}.
  public CatalanAnalyzer(Version matchVersion) {
    this(matchVersion, DefaultSetHolder.DEFAULT_STOP_SET);
   * Builds an analyzer with the given stop words.
   * @param matchVersion lucene compatibility version
   * @param stopwords a stopword set
  public CatalanAnalyzer(Version matchVersion, Set<?> stopwords) {
    this(matchVersion, stopwords, CharArraySet.EMPTY_SET);

   * Builds an analyzer with the given stop words. If a non-empty stem exclusion set is
   * provided this analyzer will add a {@link KeywordMarkerFilter} before
   * stemming.
   * @param matchVersion lucene compatibility version
   * @param stopwords a stopword set
   * @param stemExclusionSet a set of terms not to be stemmed
  public CatalanAnalyzer(Version matchVersion, Set<?> stopwords, Set stemExclusionSet) {
    super(matchVersion, stopwords);
    this.stemExclusionSet = CharArraySet.unmodifiableSet(CharArraySet.copy(
        matchVersion, stemExclusionSet));

   * Creates a
   * {@link org.apache.lucene.analysis.ReusableAnalyzerBase.TokenStreamComponents}
   * which tokenizes all the text in the provided {@link Reader}.
   * @return A
   *         {@link org.apache.lucene.analysis.ReusableAnalyzerBase.TokenStreamComponents}
   *         built from an {@link StandardTokenizer} filtered with
   *         {@link StandardFilter}, {@link LowerCaseFilter}, {@link StopFilter}
   *         , {@link KeywordMarkerFilter} if a stem exclusion set is
   *         provided and {@link SnowballFilter}.
  protected TokenStreamComponents createComponents(String fieldName,
      Reader reader) {
    final Tokenizer source = new StandardTokenizer(matchVersion, reader);
    TokenStream result = new StandardFilter(matchVersion, source);
    result = new LowerCaseFilter(matchVersion, result);
    result = new StopFilter(matchVersion, result, stopwords);
      result = new KeywordMarkerFilter(result, stemExclusionSet);
    result = new SnowballFilter(result, new CatalanStemmer());
    return new TokenStreamComponents(source, result);

Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene CatalanAnalyzer.java source code file:

my book on functional programming


new blog posts


Copyright 1998-2019 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.