lucene/analysis/common/src/test/org/apache/lucene/analysis/cjk/TestCJKBigramFilterFactory.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.cjk;

import java.io.Reader;
import java.io.StringReader;
import org.apache.lucene.analysis.BaseTokenStreamFactoryTestCase;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.Tokenizer;

/** Simple tests to ensure the CJK bigram factory is working. */
public class TestCJKBigramFilterFactory extends BaseTokenStreamFactoryTestCase {
  public void testDefaults() throws Exception {
    Reader reader = new StringReader("多くの学生が試験に落ちた。");
    TokenStream stream = tokenizerFactory("standard").create();
    ((Tokenizer) stream).setReader(reader);
    stream = tokenFilterFactory("CJKBigram").create(stream);
    assertTokenStreamContents(
        stream, new String[] {"多く", "くの", "の学", "学生", "生が", "が試", "試験", "験に", "に落", "落ち", "ちた"});
  }

  public void testHanOnly() throws Exception {
    Reader reader = new StringReader("多くの学生が試験に落ちた。");
    TokenStream stream = tokenizerFactory("standard").create();
    ((Tokenizer) stream).setReader(reader);
    stream = tokenFilterFactory("CJKBigram", "hiragana", "false").create(stream);
    assertTokenStreamContents(
        stream, new String[] {"多", "く", "の", "学生", "が", "試験", "に", "落", "ち", "た"});
  }

  public void testHanOnlyUnigrams() throws Exception {
    Reader reader = new StringReader("多くの学生が試験に落ちた。");
    TokenStream stream = tokenizerFactory("standard").create();
    ((Tokenizer) stream).setReader(reader);
    stream =
        tokenFilterFactory("CJKBigram", "hiragana", "false", "outputUnigrams", "true")
            .create(stream);
    assertTokenStreamContents(
        stream,
        new String[] {"多", "く", "の", "学", "学生", "生", "が", "試", "試験", "験", "に", "落", "ち", "た"});
  }

  /** Test that bogus arguments result in exception */
  public void testBogusArguments() throws Exception {
    IllegalArgumentException expected =
        expectThrows(
            IllegalArgumentException.class,
            () -> {
              tokenFilterFactory("CJKBigram", "bogusArg", "bogusValue");
            });
  }
}