lucene/analysis/common/src/test/org/apache/lucene/analysis/tr/TestTurkishLowerCaseFilter.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.tr;

import java.io.IOException;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.BaseTokenStreamTestCase;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.core.KeywordTokenizer;

/** Test the Turkish lowercase filter. */
public class TestTurkishLowerCaseFilter extends BaseTokenStreamTestCase {

  /** Test composed forms */
  public void testTurkishLowerCaseFilter() throws Exception {
    TokenStream stream = whitespaceMockTokenizer("\u0130STANBUL \u0130ZM\u0130R ISPARTA");
    TurkishLowerCaseFilter filter = new TurkishLowerCaseFilter(stream);
    assertTokenStreamContents(
        filter,
        new String[] {
          "istanbul", "izmir", "\u0131sparta",
        });
  }

  /** Test decomposed forms */
  public void testDecomposed() throws Exception {
    TokenStream stream =
        whitespaceMockTokenizer("\u0049\u0307STANBUL \u0049\u0307ZM\u0049\u0307R ISPARTA");
    TurkishLowerCaseFilter filter = new TurkishLowerCaseFilter(stream);
    assertTokenStreamContents(
        filter,
        new String[] {
          "istanbul", "izmir", "\u0131sparta",
        });
  }

  /**
   * Test decomposed forms with additional accents In this example, U+0049 + U+0316 + U+0307 is
   * canonically equivalent to U+0130 + U+0316, and is lowercased the same way.
   */
  public void testDecomposed2() throws Exception {
    TokenStream stream =
        whitespaceMockTokenizer(
            "\u0049\u0316\u0307STANBUL \u0049\u0307ZM\u0049\u0307R I\u0316SPARTA");
    TurkishLowerCaseFilter filter = new TurkishLowerCaseFilter(stream);
    assertTokenStreamContents(
        filter,
        new String[] {
          "i\u0316stanbul", "izmir", "\u0131\u0316sparta",
        });
  }

  public void testDecomposed3() throws Exception {
    TokenStream stream = whitespaceMockTokenizer("\u0049\u0307");
    TurkishLowerCaseFilter filter = new TurkishLowerCaseFilter(stream);
    assertTokenStreamContents(filter, new String[] {"i"});
  }

  public void testEmptyTerm() throws IOException {
    Analyzer a =
        new Analyzer() {
          @Override
          protected TokenStreamComponents createComponents(String fieldName) {
            Tokenizer tokenizer = new KeywordTokenizer();
            return new TokenStreamComponents(tokenizer, new TurkishLowerCaseFilter(tokenizer));
          }
        };
    checkOneTerm(a, "", "");
    a.close();
  }
}