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Lucene example source code file (TestCJKTokenizer.java)

This example Lucene source code file (TestCJKTokenizer.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, cjkanalyzer, exception, exception, io, ioexception, ioexception, string, string, testcjktokenizer, testtoken, testtoken

The Lucene TestCJKTokenizer.java source code

package org.apache.lucene.analysis.cjk;

/**
 * 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 org.apache.lucene.analysis.BaseTokenStreamTestCase;
import org.apache.lucene.analysis.Analyzer;

public class TestCJKTokenizer extends BaseTokenStreamTestCase {
  
  class TestToken {
    String termText;
    int start;
    int end;
    String type;
  }

  public TestToken newToken(String termText, int start, int end, int type) {
    TestToken token = new TestToken();
    token.termText = termText;
    token.type = CJKTokenizer.TOKEN_TYPE_NAMES[type];
    token.start = start;
    token.end = end;
    return token;
  }

  public void checkCJKToken(final String str, final TestToken[] out_tokens) throws IOException {
    Analyzer analyzer = new CJKAnalyzer(TEST_VERSION_CURRENT);
    String terms[] = new String[out_tokens.length];
    int startOffsets[] = new int[out_tokens.length];
    int endOffsets[] = new int[out_tokens.length];
    String types[] = new String[out_tokens.length];
    for (int i = 0; i < out_tokens.length; i++) {
      terms[i] = out_tokens[i].termText;
      startOffsets[i] = out_tokens[i].start;
      endOffsets[i] = out_tokens[i].end;
      types[i] = out_tokens[i].type;
    }
    assertAnalyzesTo(analyzer, str, terms, startOffsets, endOffsets, types, null);
  }
  
  public void checkCJKTokenReusable(final Analyzer a, final String str, final TestToken[] out_tokens) throws IOException {
    Analyzer analyzer = new CJKAnalyzer(TEST_VERSION_CURRENT);
    String terms[] = new String[out_tokens.length];
    int startOffsets[] = new int[out_tokens.length];
    int endOffsets[] = new int[out_tokens.length];
    String types[] = new String[out_tokens.length];
    for (int i = 0; i < out_tokens.length; i++) {
      terms[i] = out_tokens[i].termText;
      startOffsets[i] = out_tokens[i].start;
      endOffsets[i] = out_tokens[i].end;
      types[i] = out_tokens[i].type;
    }
    assertAnalyzesToReuse(analyzer, str, terms, startOffsets, endOffsets, types, null);
  }
  
  public void testJa1() throws IOException {
    String str = "\u4e00\u4e8c\u4e09\u56db\u4e94\u516d\u4e03\u516b\u4e5d\u5341";
       
    TestToken[] out_tokens = { 
      newToken("\u4e00\u4e8c", 0, 2, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
      newToken("\u4e8c\u4e09", 1, 3, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u4e09\u56db", 2, 4, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u56db\u4e94", 3, 5, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
      newToken("\u4e94\u516d", 4, 6, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
      newToken("\u516d\u4e03", 5, 7, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u4e03\u516b", 6, 8, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u516b\u4e5d", 7, 9, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u4e5d\u5341", 8,10, CJKTokenizer.DOUBLE_TOKEN_TYPE)
    };
    checkCJKToken(str, out_tokens);
  }
  
  public void testJa2() throws IOException {
    String str = "\u4e00 \u4e8c\u4e09\u56db \u4e94\u516d\u4e03\u516b\u4e5d \u5341";
       
    TestToken[] out_tokens = { 
      newToken("\u4e00", 0, 1, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
      newToken("\u4e8c\u4e09", 2, 4, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u4e09\u56db", 3, 5, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u4e94\u516d", 6, 8, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
      newToken("\u516d\u4e03", 7, 9, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u4e03\u516b", 8, 10, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u516b\u4e5d", 9, 11, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u5341", 12,13, CJKTokenizer.DOUBLE_TOKEN_TYPE)
    };
    checkCJKToken(str, out_tokens);
  }
  
  public void testC() throws IOException {
    String str = "abc defgh ijklmn opqrstu vwxy z";
       
    TestToken[] out_tokens = { 
      newToken("abc", 0, 3, CJKTokenizer.SINGLE_TOKEN_TYPE), 
      newToken("defgh", 4, 9, CJKTokenizer.SINGLE_TOKEN_TYPE),
      newToken("ijklmn", 10, 16, CJKTokenizer.SINGLE_TOKEN_TYPE),
      newToken("opqrstu", 17, 24, CJKTokenizer.SINGLE_TOKEN_TYPE), 
      newToken("vwxy", 25, 29, CJKTokenizer.SINGLE_TOKEN_TYPE), 
      newToken("z", 30, 31, CJKTokenizer.SINGLE_TOKEN_TYPE),
    };
    checkCJKToken(str, out_tokens);
  }
  
  public void testMix() throws IOException {
    String str = "\u3042\u3044\u3046\u3048\u304aabc\u304b\u304d\u304f\u3051\u3053";
       
    TestToken[] out_tokens = { 
      newToken("\u3042\u3044", 0, 2, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
      newToken("\u3044\u3046", 1, 3, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u3046\u3048", 2, 4, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u3048\u304a", 3, 5, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
      newToken("abc", 5, 8, CJKTokenizer.SINGLE_TOKEN_TYPE), 
      newToken("\u304b\u304d", 8, 10, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u304d\u304f", 9, 11, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u304f\u3051", 10,12, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u3051\u3053", 11,13, CJKTokenizer.DOUBLE_TOKEN_TYPE)
    };
    checkCJKToken(str, out_tokens);
  }
  
  public void testMix2() throws IOException {
    String str = "\u3042\u3044\u3046\u3048\u304aab\u3093c\u304b\u304d\u304f\u3051 \u3053";
       
    TestToken[] out_tokens = { 
      newToken("\u3042\u3044", 0, 2, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
      newToken("\u3044\u3046", 1, 3, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u3046\u3048", 2, 4, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u3048\u304a", 3, 5, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
      newToken("ab", 5, 7, CJKTokenizer.SINGLE_TOKEN_TYPE), 
      newToken("\u3093", 7, 8, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
      newToken("c", 8, 9, CJKTokenizer.SINGLE_TOKEN_TYPE), 
      newToken("\u304b\u304d", 9, 11, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u304d\u304f", 10, 12, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u304f\u3051", 11,13, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u3053", 14,15, CJKTokenizer.DOUBLE_TOKEN_TYPE)
    };
    checkCJKToken(str, out_tokens);
  }

  public void testSingleChar() throws IOException {
    String str = "\u4e00";
       
    TestToken[] out_tokens = { 
      newToken("\u4e00", 0, 1, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
    };
    checkCJKToken(str, out_tokens);
  }
  
  /*
   * Full-width text is normalized to half-width 
   */
  public void testFullWidth() throws Exception {
    String str = "Test 1234";
    TestToken[] out_tokens = { 
        newToken("test", 0, 4, CJKTokenizer.SINGLE_TOKEN_TYPE), 
        newToken("1234", 5, 9, CJKTokenizer.SINGLE_TOKEN_TYPE)
    };
    checkCJKToken(str, out_tokens);
  }
  
  /*
   * Non-english text (not just CJK) is treated the same as CJK: C1C2 C2C3 
   */
  public void testNonIdeographic() throws Exception {
    String str = "\u4e00 روبرت موير";
    TestToken[] out_tokens = {
        newToken("\u4e00", 0, 1, CJKTokenizer.DOUBLE_TOKEN_TYPE),
        newToken("رو", 2, 4, CJKTokenizer.DOUBLE_TOKEN_TYPE),
        newToken("وب", 3, 5, CJKTokenizer.DOUBLE_TOKEN_TYPE),
        newToken("بر", 4, 6, CJKTokenizer.DOUBLE_TOKEN_TYPE),
        newToken("رت", 5, 7, CJKTokenizer.DOUBLE_TOKEN_TYPE),
        newToken("مو", 8, 10, CJKTokenizer.DOUBLE_TOKEN_TYPE),
        newToken("وي", 9, 11, CJKTokenizer.DOUBLE_TOKEN_TYPE),
        newToken("ير", 10, 12, CJKTokenizer.DOUBLE_TOKEN_TYPE)
    };
    checkCJKToken(str, out_tokens);
  }
  
  /*
   * Non-english text with nonletters (non-spacing marks,etc) is treated as C1C2 C2C3,
   * except for words are split around non-letters.
   */
  public void testNonIdeographicNonLetter() throws Exception {
    String str = "\u4e00 رُوبرت موير";
    TestToken[] out_tokens = {
        newToken("\u4e00", 0, 1, CJKTokenizer.DOUBLE_TOKEN_TYPE),
        newToken("ر", 2, 3, CJKTokenizer.DOUBLE_TOKEN_TYPE),
        newToken("وب", 4, 6, CJKTokenizer.DOUBLE_TOKEN_TYPE),
        newToken("بر", 5, 7, CJKTokenizer.DOUBLE_TOKEN_TYPE),
        newToken("رت", 6, 8, CJKTokenizer.DOUBLE_TOKEN_TYPE),
        newToken("مو", 9, 11, CJKTokenizer.DOUBLE_TOKEN_TYPE),
        newToken("وي", 10, 12, CJKTokenizer.DOUBLE_TOKEN_TYPE),
        newToken("ير", 11, 13, CJKTokenizer.DOUBLE_TOKEN_TYPE)
    };
    checkCJKToken(str, out_tokens);
  }
  
  public void testTokenStream() throws Exception {
    Analyzer analyzer = new CJKAnalyzer(TEST_VERSION_CURRENT);
    assertAnalyzesTo(analyzer, "\u4e00\u4e01\u4e02", 
        new String[] { "\u4e00\u4e01", "\u4e01\u4e02"});
  }
  
  public void testReusableTokenStream() throws Exception {
    Analyzer analyzer = new CJKAnalyzer(TEST_VERSION_CURRENT);
    String str = "\u3042\u3044\u3046\u3048\u304aabc\u304b\u304d\u304f\u3051\u3053";
    
    TestToken[] out_tokens = { 
      newToken("\u3042\u3044", 0, 2, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
      newToken("\u3044\u3046", 1, 3, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u3046\u3048", 2, 4, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u3048\u304a", 3, 5, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
      newToken("abc", 5, 8, CJKTokenizer.SINGLE_TOKEN_TYPE), 
      newToken("\u304b\u304d", 8, 10, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u304d\u304f", 9, 11, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u304f\u3051", 10,12, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u3051\u3053", 11,13, CJKTokenizer.DOUBLE_TOKEN_TYPE)
    };
    checkCJKTokenReusable(analyzer, str, out_tokens);
    
    str = "\u3042\u3044\u3046\u3048\u304aab\u3093c\u304b\u304d\u304f\u3051 \u3053";
    TestToken[] out_tokens2 = { 
      newToken("\u3042\u3044", 0, 2, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
      newToken("\u3044\u3046", 1, 3, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u3046\u3048", 2, 4, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u3048\u304a", 3, 5, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
      newToken("ab", 5, 7, CJKTokenizer.SINGLE_TOKEN_TYPE), 
      newToken("\u3093", 7, 8, CJKTokenizer.DOUBLE_TOKEN_TYPE), 
      newToken("c", 8, 9, CJKTokenizer.SINGLE_TOKEN_TYPE), 
      newToken("\u304b\u304d", 9, 11, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u304d\u304f", 10, 12, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u304f\u3051", 11,13, CJKTokenizer.DOUBLE_TOKEN_TYPE),
      newToken("\u3053", 14,15, CJKTokenizer.DOUBLE_TOKEN_TYPE)
    };
    checkCJKTokenReusable(analyzer, str, out_tokens2);
  }
  
  /**
   * LUCENE-2207: wrong offset calculated by end() 
   */
  public void testFinalOffset() throws IOException {
    checkCJKToken("あい", new TestToken[] { 
        newToken("あい", 0, 2, CJKTokenizer.DOUBLE_TOKEN_TYPE) });
    checkCJKToken("あい   ", new TestToken[] { 
        newToken("あい", 0, 2, CJKTokenizer.DOUBLE_TOKEN_TYPE) });
    checkCJKToken("test", new TestToken[] { 
        newToken("test", 0, 4, CJKTokenizer.SINGLE_TOKEN_TYPE) });
    checkCJKToken("test   ", new TestToken[] { 
        newToken("test", 0, 4, CJKTokenizer.SINGLE_TOKEN_TYPE) });
    checkCJKToken("あいtest", new TestToken[] {
        newToken("あい", 0, 2, CJKTokenizer.DOUBLE_TOKEN_TYPE),
        newToken("test", 2, 6, CJKTokenizer.SINGLE_TOKEN_TYPE) });
    checkCJKToken("testあい    ", new TestToken[] { 
        newToken("test", 0, 4, CJKTokenizer.SINGLE_TOKEN_TYPE),
        newToken("あい", 4, 6, CJKTokenizer.DOUBLE_TOKEN_TYPE) });
  }
  
  /** blast some random strings through the analyzer */
  public void testRandomStrings() throws Exception {
    checkRandomData(random, new CJKAnalyzer(TEST_VERSION_CURRENT), 10000*RANDOM_MULTIPLIER);
  }
}

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