Lucene example source code file (TestICUFoldingFilter.java)

This example Lucene source code file (TestICUFoldingFilter.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, analyzer, exception, f, icufoldingfilter, icufoldingfilter, io, ioexception, reader, reader, ru, string, string, tokenstream, whitespacetokenizer

The Lucene TestICUFoldingFilter.java source code

package org.apache.lucene.analysis.icu;

/**
 * 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.Reader;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.BaseTokenStreamTestCase;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.WhitespaceTokenizer;

/**
 * Tests ICUFoldingFilter
 */
public class TestICUFoldingFilter extends BaseTokenStreamTestCase {
  Analyzer a = new Analyzer() {
    @Override
    public TokenStream tokenStream(String fieldName, Reader reader) {
      return new ICUFoldingFilter(
          new WhitespaceTokenizer(TEST_VERSION_CURRENT, reader));
    }
  };
  public void testDefaults() throws IOException {
    // case folding
    assertAnalyzesTo(a, "This is a test", new String[] { "this", "is", "a", "test" });

    // case folding
    assertAnalyzesTo(a, "Ruß", new String[] { "russ" });
    
    // case folding with accent removal
    assertAnalyzesTo(a, "ΜΆΪΟΣ", new String[] { "μαιοσ" });
    assertAnalyzesTo(a, "Μάϊος", new String[] { "μαιοσ" });

    // supplementary case folding
    assertAnalyzesTo(a, "𐐖", new String[] { "𐐾" });
    
    // normalization
    assertAnalyzesTo(a, "ﴳﴺﰧ", new String[] { "طمطمطم" });

    // removal of default ignorables
    assertAnalyzesTo(a, "क्‍ष", new String[] { "कष" });
    
    // removal of latin accents (composed)
    assertAnalyzesTo(a, "résumé", new String[] { "resume" });
    
    // removal of latin accents (decomposed)
    assertAnalyzesTo(a, "re\u0301sume\u0301", new String[] { "resume" });
    
    // fold native digits
    assertAnalyzesTo(a, "৭০৬", new String[] { "706" });
    
    // ascii-folding-filter type stuff
    assertAnalyzesTo(a, "đis is cræzy", new String[] { "dis", "is", "craezy" });

    // proper downcasing of Turkish dotted-capital I
    // (according to default case folding rules)
    assertAnalyzesTo(a, "ELİF", new String[] { "elif" });
    
    // handling of decomposed combining-dot-above
    assertAnalyzesTo(a, "eli\u0307f", new String[] { "elif" });
  }
  
  /** blast some random strings through the analyzer */
  public void testRandomStrings() throws Exception {
    checkRandomData(random, a, 10000*RANDOM_MULTIPLIER);
  }
}