Lucene example source code file (TestIndonesianStemmer.java)

This example Lucene source code file (TestIndonesianStemmer.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

analyzer, indonesianstemfilter, indonesianstemfilter, io, ioexception, ioexception, keywordtokenizer, override, reader, reader, reusableanalyzerbase, testindonesianstemmer, tokenizer, tokenstreamcomponents, tokenstreamcomponents

The Lucene TestIndonesianStemmer.java source code

package org.apache.lucene.analysis.id;

/**
 * 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.
 */

import java.io.IOException;
import java.io.Reader;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.BaseTokenStreamTestCase;
import org.apache.lucene.analysis.KeywordTokenizer;
import org.apache.lucene.analysis.ReusableAnalyzerBase;
import org.apache.lucene.analysis.Tokenizer;

/**
 * Tests {@link IndonesianStemmer}
 */
public class TestIndonesianStemmer extends BaseTokenStreamTestCase {
  /* full stemming, no stopwords */
  Analyzer a = new ReusableAnalyzerBase() {
    @Override
    public TokenStreamComponents createComponents(String fieldName, Reader reader) {
      Tokenizer tokenizer = new KeywordTokenizer(reader);
      return new TokenStreamComponents(tokenizer, new IndonesianStemFilter(tokenizer));
    }
  };
  
  /** Some examples from the paper */
  public void testExamples() throws IOException {
    checkOneTerm(a, "bukukah", "buku");
    checkOneTermReuse(a, "adalah", "ada");
    checkOneTermReuse(a, "bukupun", "buku");
    checkOneTermReuse(a, "bukuku", "buku");
    checkOneTermReuse(a, "bukumu", "buku");
    checkOneTermReuse(a, "bukunya", "buku");
    checkOneTermReuse(a, "mengukur", "ukur");
    checkOneTermReuse(a, "menyapu", "sapu");
    checkOneTermReuse(a, "menduga", "duga");
    checkOneTermReuse(a, "menuduh", "uduh");
    checkOneTermReuse(a, "membaca", "baca");
    checkOneTermReuse(a, "merusak", "rusak");
    checkOneTermReuse(a, "pengukur", "ukur");
    checkOneTermReuse(a, "penyapu", "sapu");
    checkOneTermReuse(a, "penduga", "duga");
    checkOneTermReuse(a, "pembaca", "baca");
    checkOneTermReuse(a, "diukur", "ukur");
    checkOneTermReuse(a, "tersapu", "sapu");
    checkOneTermReuse(a, "kekasih", "kasih");
    checkOneTermReuse(a, "berlari", "lari");
    checkOneTermReuse(a, "belajar", "ajar");
    checkOneTermReuse(a, "bekerja", "kerja");
    checkOneTermReuse(a, "perjelas", "jelas");
    checkOneTermReuse(a, "pelajar", "ajar");
    checkOneTermReuse(a, "pekerja", "kerja");
    checkOneTermReuse(a, "tarikkan", "tarik");
    checkOneTermReuse(a, "ambilkan", "ambil");
    checkOneTermReuse(a, "mengambilkan", "ambil");
    checkOneTermReuse(a, "makanan", "makan");
    checkOneTermReuse(a, "janjian", "janji");
    checkOneTermReuse(a, "perjanjian", "janji");
    checkOneTermReuse(a, "tandai", "tanda");
    checkOneTermReuse(a, "dapati", "dapat");
    checkOneTermReuse(a, "mendapati", "dapat");
    checkOneTermReuse(a, "pantai", "panta");
  }
  
  /** Some detailed analysis examples (that might not be the best) */
  public void testIRExamples() throws IOException {
    checkOneTerm(a, "penyalahgunaan", "salahguna");
    checkOneTermReuse(a, "menyalahgunakan", "salahguna");
    checkOneTermReuse(a, "disalahgunakan", "salahguna");
       
    checkOneTermReuse(a, "pertanggungjawaban", "tanggungjawab");
    checkOneTermReuse(a, "mempertanggungjawabkan", "tanggungjawab");
    checkOneTermReuse(a, "dipertanggungjawabkan", "tanggungjawab");
    
    checkOneTermReuse(a, "pelaksanaan", "laksana");
    checkOneTermReuse(a, "pelaksana", "laksana");
    checkOneTermReuse(a, "melaksanakan", "laksana");
    checkOneTermReuse(a, "dilaksanakan", "laksana");
    
    checkOneTermReuse(a, "melibatkan", "libat");
    checkOneTermReuse(a, "terlibat", "libat");
    
    checkOneTermReuse(a, "penculikan", "culik");
    checkOneTermReuse(a, "menculik", "culik");
    checkOneTermReuse(a, "diculik", "culik");
    checkOneTermReuse(a, "penculik", "culik");
    
    checkOneTermReuse(a, "perubahan", "ubah");
    checkOneTermReuse(a, "peledakan", "ledak");
    checkOneTermReuse(a, "penanganan", "tangan");
    checkOneTermReuse(a, "kepolisian", "polisi");
    checkOneTermReuse(a, "kenaikan", "naik");
    checkOneTermReuse(a, "bersenjata", "senjata");
    checkOneTermReuse(a, "penyelewengan", "seleweng");
    checkOneTermReuse(a, "kecelakaan", "celaka");
  }
  
  /* inflectional-only stemming */
  Analyzer b = new ReusableAnalyzerBase() {
    @Override
    public TokenStreamComponents createComponents(String fieldName, Reader reader) {
      Tokenizer tokenizer = new KeywordTokenizer(reader);
      return new TokenStreamComponents(tokenizer, new IndonesianStemFilter(tokenizer, false));
    }
  };
  
  /** Test stemming only inflectional suffixes */
  public void testInflectionalOnly() throws IOException {
    checkOneTerm(b, "bukunya", "buku");
    checkOneTermReuse(b, "bukukah", "buku");
    checkOneTermReuse(b, "bukunyakah", "buku");
    checkOneTermReuse(b, "dibukukannya", "dibukukan");
  }
  
  public void testShouldntStem() throws IOException {
    checkOneTerm(a, "bersenjata", "senjata");
    checkOneTermReuse(a, "bukukah", "buku");
    checkOneTermReuse(a, "gigi", "gigi");
  }
}