Lucene example source code file (TestLatvianStemmer.java)

This example Lucene source code file (TestLatvianStemmer.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, basetokenstreamtestcase, io, ioexception, ioexception, latvianstemfilter, mocktokenizer, override, reader, reader, reusableanalyzerbase, reusableanalyzerbase, tokenizer, tokenstreamcomponents, tokenstreamcomponents

The Lucene TestLatvianStemmer.java source code

package org.apache.lucene.analysis.lv;

/**
 * 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.MockTokenizer;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.ReusableAnalyzerBase;

/**
 * Basic tests for {@link LatvianStemmer}
 */
public class TestLatvianStemmer extends BaseTokenStreamTestCase {
  private Analyzer a = new ReusableAnalyzerBase() {
    @Override
    protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
      Tokenizer tokenizer = new MockTokenizer(reader, MockTokenizer.WHITESPACE, false);
      return new TokenStreamComponents(tokenizer, new LatvianStemFilter(tokenizer));
    }
  };
  
  public void testNouns1() throws IOException {
    // decl. I
    checkOneTerm(a, "tēvs",   "tēv"); // nom. sing.
    checkOneTerm(a, "tēvi",   "tēv"); // nom. pl.
    checkOneTerm(a, "tēva",   "tēv"); // gen. sing.
    checkOneTerm(a, "tēvu",   "tēv"); // gen. pl.
    checkOneTerm(a, "tēvam",  "tēv"); // dat. sing.
    checkOneTerm(a, "tēviem", "tēv"); // dat. pl.
    checkOneTerm(a, "tēvu",   "tēv"); // acc. sing.
    checkOneTerm(a, "tēvus",  "tēv"); // acc. pl.
    checkOneTerm(a, "tēvā",   "tēv"); // loc. sing.
    checkOneTerm(a, "tēvos",  "tēv"); // loc. pl.
    checkOneTerm(a, "tēvs",   "tēv"); // voc. sing.
    checkOneTerm(a, "tēvi",   "tēv"); // voc. pl.
  }
  
  /**
   * decl II nouns with (s,t) -> š and (d,z) -> ž
   * palatalization will generally conflate to two stems
   * due to the ambiguity (plural and singular).
   */
  public void testNouns2() throws IOException {
    // decl. II
    
    // c -> č palatalization
    checkOneTerm(a, "lācis",  "lāc"); // nom. sing.
    checkOneTerm(a, "lāči",   "lāc"); // nom. pl.
    checkOneTerm(a, "lāča",   "lāc"); // gen. sing.
    checkOneTerm(a, "lāču",   "lāc"); // gen. pl.
    checkOneTerm(a, "lācim",  "lāc"); // dat. sing.
    checkOneTerm(a, "lāčiem", "lāc"); // dat. pl.
    checkOneTerm(a, "lāci",   "lāc"); // acc. sing.
    checkOneTerm(a, "lāčus",  "lāc"); // acc. pl.
    checkOneTerm(a, "lācī",   "lāc"); // loc. sing.
    checkOneTerm(a, "lāčos",  "lāc"); // loc. pl.
    checkOneTerm(a, "lāci",   "lāc"); // voc. sing.
    checkOneTerm(a, "lāči",   "lāc"); // voc. pl.
    
    // n -> ņ palatalization
    checkOneTerm(a, "akmens",   "akmen"); // nom. sing.
    checkOneTerm(a, "akmeņi",   "akmen"); // nom. pl.
    checkOneTerm(a, "akmens",   "akmen"); // gen. sing.
    checkOneTerm(a, "akmeņu",   "akmen"); // gen. pl.
    checkOneTerm(a, "akmenim",  "akmen"); // dat. sing.
    checkOneTerm(a, "akmeņiem", "akmen"); // dat. pl.
    checkOneTerm(a, "akmeni",   "akmen"); // acc. sing.
    checkOneTerm(a, "akmeņus",  "akmen"); // acc. pl.
    checkOneTerm(a, "akmenī",   "akmen"); // loc. sing.
    checkOneTerm(a, "akmeņos",  "akmen"); // loc. pl.
    checkOneTerm(a, "akmens",   "akmen"); // voc. sing.
    checkOneTerm(a, "akmeņi",   "akmen"); // voc. pl.
    
    // no palatalization
    checkOneTerm(a, "kurmis",   "kurm"); // nom. sing.
    checkOneTerm(a, "kurmji",   "kurm"); // nom. pl.
    checkOneTerm(a, "kurmja",   "kurm"); // gen. sing.
    checkOneTerm(a, "kurmju",   "kurm"); // gen. pl.
    checkOneTerm(a, "kurmim",   "kurm"); // dat. sing.
    checkOneTerm(a, "kurmjiem", "kurm"); // dat. pl.
    checkOneTerm(a, "kurmi",    "kurm"); // acc. sing.
    checkOneTerm(a, "kurmjus",  "kurm"); // acc. pl.
    checkOneTerm(a, "kurmī",    "kurm"); // loc. sing.
    checkOneTerm(a, "kurmjos",  "kurm"); // loc. pl.
    checkOneTerm(a, "kurmi",    "kurm"); // voc. sing.
    checkOneTerm(a, "kurmji",   "kurm"); // voc. pl.
  }
  
  public void testNouns3() throws IOException {
    // decl III
    checkOneTerm(a, "lietus",  "liet"); // nom. sing.
    checkOneTerm(a, "lieti",   "liet"); // nom. pl.
    checkOneTerm(a, "lietus",  "liet"); // gen. sing.
    checkOneTerm(a, "lietu",   "liet"); // gen. pl.
    checkOneTerm(a, "lietum",  "liet"); // dat. sing.
    checkOneTerm(a, "lietiem", "liet"); // dat. pl.
    checkOneTerm(a, "lietu",   "liet"); // acc. sing.
    checkOneTerm(a, "lietus",  "liet"); // acc. pl.
    checkOneTerm(a, "lietū",   "liet"); // loc. sing.
    checkOneTerm(a, "lietos",  "liet"); // loc. pl.
    checkOneTerm(a, "lietus",  "liet"); // voc. sing.
    checkOneTerm(a, "lieti",   "liet"); // voc. pl.
  }
  
  public void testNouns4() throws IOException {
    // decl IV
    checkOneTerm(a, "lapa",  "lap"); // nom. sing.
    checkOneTerm(a, "lapas", "lap"); // nom. pl.
    checkOneTerm(a, "lapas", "lap"); // gen. sing.
    checkOneTerm(a, "lapu",  "lap"); // gen. pl.
    checkOneTerm(a, "lapai", "lap"); // dat. sing.
    checkOneTerm(a, "lapām", "lap"); // dat. pl.
    checkOneTerm(a, "lapu",  "lap"); // acc. sing.
    checkOneTerm(a, "lapas", "lap"); // acc. pl.
    checkOneTerm(a, "lapā",  "lap"); // loc. sing.
    checkOneTerm(a, "lapās", "lap"); // loc. pl.
    checkOneTerm(a, "lapa",  "lap"); // voc. sing.
    checkOneTerm(a, "lapas", "lap"); // voc. pl.
    
    checkOneTerm(a, "puika",  "puik"); // nom. sing.
    checkOneTerm(a, "puikas", "puik"); // nom. pl.
    checkOneTerm(a, "puikas", "puik"); // gen. sing.
    checkOneTerm(a, "puiku",  "puik"); // gen. pl.
    checkOneTerm(a, "puikam", "puik"); // dat. sing.
    checkOneTerm(a, "puikām", "puik"); // dat. pl.
    checkOneTerm(a, "puiku",  "puik"); // acc. sing.
    checkOneTerm(a, "puikas", "puik"); // acc. pl.
    checkOneTerm(a, "puikā",  "puik"); // loc. sing.
    checkOneTerm(a, "puikās", "puik"); // loc. pl.
    checkOneTerm(a, "puika",  "puik"); // voc. sing.
    checkOneTerm(a, "puikas", "puik"); // voc. pl.
  }
  
  /**
   * Genitive plural forms with (s,t) -> š and (d,z) -> ž
   * will not conflate due to ambiguity.
   */
  public void testNouns5() throws IOException {
    // decl V
    // l -> ļ palatalization
    checkOneTerm(a, "egle",  "egl"); // nom. sing.
    checkOneTerm(a, "egles", "egl"); // nom. pl.
    checkOneTerm(a, "egles", "egl"); // gen. sing.
    checkOneTerm(a, "egļu",  "egl"); // gen. pl.
    checkOneTerm(a, "eglei", "egl"); // dat. sing.
    checkOneTerm(a, "eglēm", "egl"); // dat. pl.
    checkOneTerm(a, "egli",  "egl"); // acc. sing.
    checkOneTerm(a, "egles", "egl"); // acc. pl.
    checkOneTerm(a, "eglē",  "egl"); // loc. sing.
    checkOneTerm(a, "eglēs", "egl"); // loc. pl.
    checkOneTerm(a, "egle",  "egl"); // voc. sing.
    checkOneTerm(a, "egles", "egl"); // voc. pl.
  }
  
  public void testNouns6() throws IOException {
    // decl VI
    
    // no palatalization
    checkOneTerm(a, "govs",  "gov"); // nom. sing.
    checkOneTerm(a, "govis", "gov"); // nom. pl.
    checkOneTerm(a, "govs",  "gov"); // gen. sing.
    checkOneTerm(a, "govju", "gov"); // gen. pl.
    checkOneTerm(a, "govij", "gov"); // dat. sing.
    checkOneTerm(a, "govīm", "gov"); // dat. pl.
    checkOneTerm(a, "govi ", "gov"); // acc. sing.
    checkOneTerm(a, "govis", "gov"); // acc. pl.
    checkOneTerm(a, "govi ", "gov"); // inst. sing.
    checkOneTerm(a, "govīm", "gov"); // inst. pl.
    checkOneTerm(a, "govī",  "gov"); // loc. sing.
    checkOneTerm(a, "govīs", "gov"); // loc. pl.
    checkOneTerm(a, "govs",  "gov"); // voc. sing.
    checkOneTerm(a, "govis", "gov"); // voc. pl.
  }
  
  public void testAdjectives() throws IOException {
    checkOneTerm(a, "zils",     "zil"); // indef. nom. masc. sing.
    checkOneTerm(a, "zilais",   "zil"); // def. nom. masc. sing.
    checkOneTerm(a, "zili",     "zil"); // indef. nom. masc. pl.
    checkOneTerm(a, "zilie",    "zil"); // def. nom. masc. pl.
    checkOneTerm(a, "zila",     "zil"); // indef. nom. fem. sing.
    checkOneTerm(a, "zilā",     "zil"); // def. nom. fem. sing.
    checkOneTerm(a, "zilas",    "zil"); // indef. nom. fem. pl.
    checkOneTerm(a, "zilās",    "zil"); // def. nom. fem. pl.
    checkOneTerm(a, "zila",     "zil"); // indef. gen. masc. sing.
    checkOneTerm(a, "zilā",     "zil"); // def. gen. masc. sing.
    checkOneTerm(a, "zilu",     "zil"); // indef. gen. masc. pl.
    checkOneTerm(a, "zilo",     "zil"); // def. gen. masc. pl.
    checkOneTerm(a, "zilas",    "zil"); // indef. gen. fem. sing.
    checkOneTerm(a, "zilās",    "zil"); // def. gen. fem. sing.
    checkOneTerm(a, "zilu",     "zil"); // indef. gen. fem. pl.
    checkOneTerm(a, "zilo",     "zil"); // def. gen. fem. pl.
    checkOneTerm(a, "zilam",    "zil"); // indef. dat. masc. sing.
    checkOneTerm(a, "zilajam",  "zil"); // def. dat. masc. sing.
    checkOneTerm(a, "ziliem",   "zil"); // indef. dat. masc. pl.
    checkOneTerm(a, "zilajiem", "zil"); // def. dat. masc. pl.
    checkOneTerm(a, "zilai",    "zil"); // indef. dat. fem. sing.
    checkOneTerm(a, "zilajai",  "zil"); // def. dat. fem. sing.
    checkOneTerm(a, "zilām",    "zil"); // indef. dat. fem. pl.
    checkOneTerm(a, "zilajām",  "zil"); // def. dat. fem. pl.
    checkOneTerm(a, "zilu",     "zil"); // indef. acc. masc. sing.
    checkOneTerm(a, "zilo",     "zil"); // def. acc. masc. sing.
    checkOneTerm(a, "zilus",    "zil"); // indef. acc. masc. pl.
    checkOneTerm(a, "zilos",    "zil"); // def. acc. masc. pl.
    checkOneTerm(a, "zilu",     "zil"); // indef. acc. fem. sing.
    checkOneTerm(a, "zilo",     "zil"); // def. acc. fem. sing.
    checkOneTerm(a, "zilās",    "zil"); // indef. acc. fem. pl.
    checkOneTerm(a, "zilās",    "zil"); // def. acc. fem. pl.
    checkOneTerm(a, "zilā",     "zil"); // indef. loc. masc. sing.
    checkOneTerm(a, "zilajā",   "zil"); // def. loc. masc. sing.
    checkOneTerm(a, "zilos",    "zil"); // indef. loc. masc. pl.
    checkOneTerm(a, "zilajos",  "zil"); // def. loc. masc. pl.
    checkOneTerm(a, "zilā",     "zil"); // indef. loc. fem. sing.
    checkOneTerm(a, "zilajā",   "zil"); // def. loc. fem. sing.
    checkOneTerm(a, "zilās",    "zil"); // indef. loc. fem. pl.
    checkOneTerm(a, "zilajās",  "zil"); // def. loc. fem. pl.
    checkOneTerm(a, "zilais",   "zil"); // voc. masc. sing.
    checkOneTerm(a, "zilie",    "zil"); // voc. masc. pl.
    checkOneTerm(a, "zilā",     "zil"); // voc. fem. sing.
    checkOneTerm(a, "zilās",    "zil"); // voc. fem. pl.
  }
  
  /**
   * Note: we intentionally don't handle the ambiguous
   * (s,t) -> š and (d,z) -> ž
   */
  public void testPalatalization() throws IOException {
    checkOneTerm(a, "krāsns", "krāsn"); // nom. sing.
    checkOneTerm(a, "krāšņu", "krāsn"); // gen. pl.
    checkOneTerm(a, "zvaigzne", "zvaigzn"); // nom. sing.
    checkOneTerm(a, "zvaigžņu", "zvaigzn"); // gen. pl.
    checkOneTerm(a, "kāpslis", "kāpsl"); // nom. sing.
    checkOneTerm(a, "kāpšļu",  "kāpsl"); // gen. pl.
    checkOneTerm(a, "zizlis", "zizl"); // nom. sing.
    checkOneTerm(a, "zižļu",  "zizl"); // gen. pl.
    checkOneTerm(a, "vilnis", "viln"); // nom. sing.
    checkOneTerm(a, "viļņu",  "viln"); // gen. pl.
    checkOneTerm(a, "lelle", "lell"); // nom. sing.
    checkOneTerm(a, "leļļu", "lell"); // gen. pl.
    checkOneTerm(a, "pinne", "pinn"); // nom. sing.
    checkOneTerm(a, "piņņu", "pinn"); // gen. pl.
    checkOneTerm(a, "rīkste", "rīkst"); // nom. sing.
    checkOneTerm(a, "rīkšu",  "rīkst"); // gen. pl.
  }
  
  /**
   * Test some length restrictions, we require a 3+ char stem,
   * with at least one vowel.
   */
  public void testLength() throws IOException {
    checkOneTerm(a, "usa", "usa"); // length
    checkOneTerm(a, "60ms", "60ms"); // vowel count
  }
}