[LUCENE-1003] [PATCH] RussianAnalyzer's tokenizer skips numbers from input text,

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2
• Component/s: modules/analysis
• Lucene Fields: New, Patch Available
• Assignee: Otis Gospodnetic
• Reporter: OpenTeam.ru
• Created: 19/Sep/07 05:00
• Updated: 28/Aug/22 11:41
• Resolved: 14/May/08 05:38

Description

RussianAnalyzer's tokenizer skips numbers from input text, so that resulting token stream miss numbers. Problem can be solved by adding numbers to RussianCharsets.UnicodeRussian. See test case below for details.

TestRussianAnalyzer.java

public class TestRussianAnalyzer extends TestCase {

  Reader reader = new StringReader("text 1000");

  // test FAILS
  public void testStemmer() {
    testAnalyzer(new RussianAnalyzer());
  }

  // test PASSES
  public void testFixedRussianAnalyzer() {
    testAnalyzer(new RussianAnalyzer(getRussianCharSet()));
  }

  private void testAnalyzer(RussianAnalyzer analyzer) {
    try {
      TokenStream stream = analyzer.tokenStream("text", reader);
      assertEquals("text", stream.next().termText());
      assertNotNull(stream.next());
    } catch (IOException e) {
      fail(e.getMessage());
    }
  }

  private char[] getRussianCharSet() {
    int length = RussianCharsets.UnicodeRussian.length;
    final char[] russianChars = new char[length + 10];

    System
        .arraycopy(RussianCharsets.UnicodeRussian, 0, russianChars, 0, length);
    russianChars[length++] = '0';
    russianChars[length++] = '1';
    russianChars[length++] = '2';
    russianChars[length++] = '3';
    russianChars[length++] = '4';
    russianChars[length++] = '5';
    russianChars[length++] = '6';
    russianChars[length++] = '7';
    russianChars[length++] = '8';
    russianChars[length] = '9';
    return russianChars;
  }
}