Lucene example source code file (TestRussianAnalyzer.java)

This example Lucene source code file (TestRussianAnalyzer.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, chartermattribute, deprecated, exception, exception, inputstreamreader, inputstreamreader, io, ioexception, russiananalyzer, russiananalyzer, russianlettertokenizer, string, string, utf-8

The Lucene TestRussianAnalyzer.java source code

package org.apache.lucene.analysis.ru;

/**
 * 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.InputStreamReader;

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

/**
 * Test case for RussianAnalyzer.
 */

public class TestRussianAnalyzer extends BaseTokenStreamTestCase
{
    private InputStreamReader inWords;

    private InputStreamReader sampleUnicode;

    /**
     * @deprecated remove this test and its datafiles in Lucene 4.0
     * the Snowball version has its own data tests.
     */
    @Deprecated
    public void testUnicode30() throws IOException
    {
        RussianAnalyzer ra = new RussianAnalyzer(Version.LUCENE_30);
        inWords =
            new InputStreamReader(
                getClass().getResourceAsStream("testUTF8.txt"),
                "UTF-8");

        sampleUnicode =
            new InputStreamReader(
                getClass().getResourceAsStream("resUTF8.htm"),
                "UTF-8");

        TokenStream in = ra.tokenStream("all", inWords);

        RussianLetterTokenizer sample =
            new RussianLetterTokenizer(TEST_VERSION_CURRENT,
                sampleUnicode);

        CharTermAttribute text = in.getAttribute(CharTermAttribute.class);
        CharTermAttribute sampleText = sample.getAttribute(CharTermAttribute.class);

        for (;;)
        {
          if (in.incrementToken() == false)
            break;

            boolean nextSampleToken = sample.incrementToken();
            assertEquals(
                "Unicode",
                text.toString(),
                nextSampleToken == false
                ? null
                : sampleText.toString());
        }

        inWords.close();
        sampleUnicode.close();
    }
    
    /** Check that RussianAnalyzer doesnt discard any numbers */
    public void testDigitsInRussianCharset() throws IOException
    {
      RussianAnalyzer ra = new RussianAnalyzer(TEST_VERSION_CURRENT);
      assertAnalyzesTo(ra, "text 1000", new String[] { "text", "1000" });
    }
    
    /** @deprecated remove this test in Lucene 4.0: stopwords changed */
    @Deprecated
    public void testReusableTokenStream30() throws Exception {
      Analyzer a = new RussianAnalyzer(Version.LUCENE_30);
      assertAnalyzesToReuse(a, "Вместе с тем о силе электромагнитной энергии имели представление еще",
          new String[] { "вмест", "сил", "электромагнитн", "энерг", "имел", "представлен" });
      assertAnalyzesToReuse(a, "Но знание это хранилось в тайне",
          new String[] { "знан", "хран", "тайн" });
    }
    
    public void testReusableTokenStream() throws Exception {
      Analyzer a = new RussianAnalyzer(TEST_VERSION_CURRENT);
      assertAnalyzesToReuse(a, "Вместе с тем о силе электромагнитной энергии имели представление еще",
          new String[] { "вмест", "сил", "электромагнитн", "энерг", "имел", "представлен" });
      assertAnalyzesToReuse(a, "Но знание это хранилось в тайне",
          new String[] { "знан", "эт", "хран", "тайн" });
    }
    
    
    public void testWithStemExclusionSet() throws Exception {
      CharArraySet set = new CharArraySet(TEST_VERSION_CURRENT, 1, true);
      set.add("представление");
      Analyzer a = new RussianAnalyzer(TEST_VERSION_CURRENT, RussianAnalyzer.getDefaultStopSet() , set);
      assertAnalyzesToReuse(a, "Вместе с тем о силе электромагнитной энергии имели представление еще",
          new String[] { "вмест", "сил", "электромагнитн", "энерг", "имел", "представление" });
     
    }
    
    /** blast some random strings through the analyzer */
    public void testRandomStrings() throws Exception {
      checkRandomData(random, new RussianAnalyzer(TEST_VERSION_CURRENT), 10000*RANDOM_MULTIPLIER);
    }
}