Lucene example source code file (TestICUNormalizer2Filter.java)

This example Lucene source code file (TestICUNormalizer2Filter.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, icunormalizer2filter, io, ioexception, override, reader, reader, ru, string, string, tokenstream, tokenstream, whitespacetokenizer

The Lucene TestICUNormalizer2Filter.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;

import com.ibm.icu.text.Normalizer2;

/**
 * Tests the ICUNormalizer2Filter
 */
public class TestICUNormalizer2Filter extends BaseTokenStreamTestCase {
  Analyzer a = new Analyzer() {
    @Override
    public TokenStream tokenStream(String fieldName, Reader reader) {
      return new ICUNormalizer2Filter(
          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
    assertAnalyzesTo(a, "ΜΆΪΟΣ", new String[] { "μάϊοσ" });
    assertAnalyzesTo(a, "Μάϊος", new String[] { "μάϊοσ" });

    // 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[] { "क्ष" });
  }
  
  public void testAlternate() throws IOException {
    Analyzer a = new Analyzer() {
      @Override
      public TokenStream tokenStream(String fieldName, Reader reader) {
        return new ICUNormalizer2Filter(
            new WhitespaceTokenizer(TEST_VERSION_CURRENT, reader),
            /* specify nfc with decompose to get nfd */
            Normalizer2.getInstance(null, "nfc", Normalizer2.Mode.DECOMPOSE));
      }
    };
    
    // decompose EAcute into E + combining Acute
    assertAnalyzesTo(a, "\u00E9", new String[] { "\u0065\u0301" });
  }
  
  /** blast some random strings through the analyzer */
  public void testRandomStrings() throws Exception {
    checkRandomData(random, a, 10000*RANDOM_MULTIPLIER);
  }
}