Lucene example source code file (TestCzechAnalyzer.java)

This example Lucene source code file (TestCzechAnalyzer.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, czechanalyzer, czechanalyzer, deprecated, exception, exception, inputstream, io, ioexception, pokud, pokud, republika, string, string, utf-8

The Lucene TestCzechAnalyzer.java source code

package org.apache.lucene.analysis.cz;

/**
 * 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.InputStream;

import org.apache.lucene.analysis.BaseTokenStreamTestCase;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.CharArraySet;
import org.apache.lucene.util.Version;

/**
 * Test the CzechAnalyzer
 * 
 * Before Lucene 3.1, CzechAnalyzer was a StandardAnalyzer with a custom 
 * stopword list. As of 3.1 it also includes a stemmer.
 *
 */
public class TestCzechAnalyzer extends BaseTokenStreamTestCase {
  
  /**
   * @deprecated Remove this test when support for 3.0 indexes is no longer needed.
   */
  @Deprecated
  public void testStopWordLegacy() throws Exception {
    assertAnalyzesTo(new CzechAnalyzer(Version.LUCENE_30), "Pokud mluvime o volnem", 
        new String[] { "mluvime", "volnem" });
  }
  
  public void testStopWord() throws Exception {
    assertAnalyzesTo(new CzechAnalyzer(TEST_VERSION_CURRENT), "Pokud mluvime o volnem", 
        new String[] { "mluvim", "voln" });
  }
  
  /**
   * @deprecated Remove this test when support for 3.0 indexes is no longer needed.
   */
  @Deprecated
  public void testReusableTokenStreamLegacy() throws Exception {
    Analyzer analyzer = new CzechAnalyzer(Version.LUCENE_30);
    assertAnalyzesToReuse(analyzer, "Pokud mluvime o volnem", new String[] { "mluvime", "volnem" });
    assertAnalyzesToReuse(analyzer, "Česká Republika", new String[] { "česká", "republika" });
  }
  
  public void testReusableTokenStream() throws Exception {
    Analyzer analyzer = new CzechAnalyzer(TEST_VERSION_CURRENT);
    assertAnalyzesToReuse(analyzer, "Pokud mluvime o volnem", new String[] { "mluvim", "voln" });
    assertAnalyzesToReuse(analyzer, "Česká Republika", new String[] { "česk", "republik" });
  }

  /**
   * An input stream that always throws IOException for testing.
   * @deprecated Remove this class when the loadStopWords method is removed.
   */
  @Deprecated
  private class UnreliableInputStream extends InputStream {
    @Override
    public int read() throws IOException {
      throw new IOException();
    }
  }
  
  /**
   * The loadStopWords method does not throw IOException on error,
   * instead previously it set the stoptable to null (versus empty)
   * this would cause a NPE when it is time to create the StopFilter.
   * @deprecated Remove this test when the loadStopWords method is removed.
   */
  @Deprecated
  public void testInvalidStopWordFile() throws Exception {
    CzechAnalyzer cz = new CzechAnalyzer(Version.LUCENE_30);
    cz.loadStopWords(new UnreliableInputStream(), "UTF-8");
    assertAnalyzesTo(cz, "Pokud mluvime o volnem",
        new String[] { "pokud", "mluvime", "o", "volnem" });
  }
  
  /** 
   * Test that changes to the stop table via loadStopWords are applied immediately
   * when using reusable token streams.
   * @deprecated Remove this test when the loadStopWords method is removed.
   */
  @Deprecated
  public void testStopWordFileReuse() throws Exception {
    CzechAnalyzer cz = new CzechAnalyzer(Version.LUCENE_30);
    assertAnalyzesToReuse(cz, "Česká Republika", 
      new String[] { "česká", "republika" });
    
    InputStream stopwords = getClass().getResourceAsStream("customStopWordFile.txt");
    cz.loadStopWords(stopwords, "UTF-8");
    
    assertAnalyzesToReuse(cz, "Česká Republika", new String[] { "česká" });
  }
  
  public void testWithStemExclusionSet() throws IOException{
    CharArraySet set = new CharArraySet(TEST_VERSION_CURRENT, 1, true);
    set.add("hole");
    CzechAnalyzer cz = new CzechAnalyzer(TEST_VERSION_CURRENT, CharArraySet.EMPTY_SET, set);
    assertAnalyzesTo(cz, "hole desek", new String[] {"hole", "desk"});
  }
  
  /** blast some random strings through the analyzer */
  public void testRandomStrings() throws Exception {
    checkRandomData(random, new CzechAnalyzer(TEST_VERSION_CURRENT), 10000*RANDOM_MULTIPLIER);
  }
}