TestThaiAnalyzer.java

/*
 * 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.
 */
package org.apache.lucene.analysis.th;


import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.BaseTokenStreamTestCase;
import org.apache.lucene.analysis.CharArraySet;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.core.StopAnalyzer;
import org.apache.lucene.analysis.tokenattributes.FlagsAttribute;

/**
 * Test case for ThaiAnalyzer, modified from TestFrenchAnalyzer
 *
 */

public class TestThaiAnalyzer extends BaseTokenStreamTestCase {
  
  @Override
  public void setUp() throws Exception {
    super.setUp();
    assumeTrue("JRE does not support Thai dictionary-based BreakIterator", ThaiTokenizer.DBBI_AVAILABLE);
  }
  /* 
   * testcase for offsets
   */
  public void testOffsets() throws Exception {
    Analyzer analyzer = new ThaiAnalyzer(CharArraySet.EMPTY_SET);
    assertAnalyzesTo(analyzer, "การที่ได้ต้องแสดงว่างานดี",
        new String[] { "การ", "ที่", "ได้", "ต้อง", "แสดง", "ว่า", "งาน", "ดี" },
        new int[] { 0, 3, 6, 9, 13, 17, 20, 23 },
        new int[] { 3, 6, 9, 13, 17, 20, 23, 25 });
    analyzer.close();
  }
  
  public void testStopWords() throws Exception {
    Analyzer analyzer = new ThaiAnalyzer();
    assertAnalyzesTo(analyzer, "การที่ได้ต้องแสดงว่างานดี",
        new String[] { "แสดง", "งาน", "ดี" },
        new int[] { 13, 20, 23 },
        new int[] { 17, 23, 25 },
        new int[] { 5, 2, 1 });
    analyzer.close();
  }
  
  /*
   * Test that position increments are adjusted correctly for stopwords.
   */
  // note this test uses stopfilter's stopset
  public void testPositionIncrements() throws Exception {
    final ThaiAnalyzer analyzer = new ThaiAnalyzer(StopAnalyzer.ENGLISH_STOP_WORDS_SET);
    assertAnalyzesTo(analyzer, "การที่ได้ต้อง the แสดงว่างานดี", 
        new String[] { "การ", "ที่", "ได้", "ต้อง", "แสดง", "ว่า", "งาน", "ดี" },
        new int[] { 0, 3, 6, 9, 18, 22, 25, 28 },
        new int[] { 3, 6, 9, 13, 22, 25, 28, 30 },
        new int[] { 1, 1, 1, 1, 2, 1, 1, 1 });
   
    // case that a stopword is adjacent to thai text, with no whitespace
    assertAnalyzesTo(analyzer, "การที่ได้ต้องthe แสดงว่างานดี", 
        new String[] { "การ", "ที่", "ได้", "ต้อง", "แสดง", "ว่า", "งาน", "ดี" },
        new int[] { 0, 3, 6, 9, 17, 21, 24, 27 },
        new int[] { 3, 6, 9, 13, 21, 24, 27, 29 },
        new int[] { 1, 1, 1, 1, 2, 1, 1, 1 });
    analyzer.close();
  }
  
  public void testReusableTokenStream() throws Exception {
    ThaiAnalyzer analyzer = new ThaiAnalyzer(CharArraySet.EMPTY_SET);
    assertAnalyzesTo(analyzer, "", new String[] {});
    
    assertAnalyzesTo(
        analyzer,
        "การที่ได้ต้องแสดงว่างานดี",
        new String[] { "การ", "ที่", "ได้", "ต้อง", "แสดง", "ว่า", "งาน", "ดี"});
    
    assertAnalyzesTo(
        analyzer,
        "บริษัทชื่อ XY&Z - คุยกับ xyz@demo.com",
        new String[] { "บริษัท", "ชื่อ", "xy", "z", "คุย", "กับ", "xyz", "demo.com" });
    analyzer.close();
  }
  
  /** blast some random strings through the analyzer */
  public void testRandomStrings() throws Exception {
    Analyzer analyzer = new ThaiAnalyzer();
    checkRandomData(random(), analyzer, 1000*RANDOM_MULTIPLIER);
    analyzer.close();
  }
  
  /** blast some random large strings through the analyzer */
  public void testRandomHugeStrings() throws Exception {
    Analyzer analyzer = new ThaiAnalyzer();
    checkRandomData(random(), analyzer, 100*RANDOM_MULTIPLIER, 8192);
    analyzer.close();
  }
  
  // LUCENE-3044
  public void testAttributeReuse() throws Exception {
    ThaiAnalyzer analyzer = new ThaiAnalyzer();
    // just consume
    TokenStream ts = analyzer.tokenStream("dummy", "ภาษาไทย");
    assertTokenStreamContents(ts, new String[] { "ภาษา", "ไทย" });
    // this consumer adds flagsAtt, which this analyzer does not use. 
    ts = analyzer.tokenStream("dummy", "ภาษาไทย");
    ts.addAttribute(FlagsAttribute.class);
    assertTokenStreamContents(ts, new String[] { "ภาษา", "ไทย" });
    analyzer.close();
  }
  
  /**
   * test we fold digits to latin-1
   */
  public void testDigits() throws Exception {
    ThaiAnalyzer a = new ThaiAnalyzer();
    checkOneTerm(a, "๑๒๓๔", "1234");
    a.close();
  }
  
  public void testTwoSentences() throws Exception {
    Analyzer analyzer = new ThaiAnalyzer(CharArraySet.EMPTY_SET);
    assertAnalyzesTo(analyzer, "This is a test. การที่ได้ต้องแสดงว่างานดี",
          new String[] { "this", "is", "a", "test", "การ", "ที่", "ได้", "ต้อง", "แสดง", "ว่า", "งาน", "ดี" },
          new int[] { 0, 5, 8, 10, 16, 19, 22, 25, 29, 33, 36, 39 },
          new int[] { 4, 7, 9, 14, 19, 22, 25, 29, 33, 36, 39, 41 });
    analyzer.close();
  }
}