package org.apache.lucene.analysis.de;

/**
 * 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.Tokenizer;
import org.apache.lucene.analysis.core.WhitespaceTokenizer;
import org.apache.lucene.analysis.util.ReusableAnalyzerBase;

import static org.apache.lucene.analysis.util.VocabularyAssert.*;

/**
 * Simple tests for {@link GermanMinimalStemFilter}
 */
public class TestGermanMinimalStemFilter extends BaseTokenStreamTestCase {
  private Analyzer analyzer = new ReusableAnalyzerBase() {
    @Override
    protected TokenStreamComponents createComponents(String fieldName,
        Reader reader) {
      Tokenizer source = new WhitespaceTokenizer(TEST_VERSION_CURRENT, reader);
      return new TokenStreamComponents(source, new GermanMinimalStemFilter(source));
    }
  };
  
  /** Test some examples from the paper */
  public void testExamples() throws IOException {
    checkOneTerm(analyzer, "sängerinnen", "sangerin");
    checkOneTerm(analyzer, "frauen", "frau");
    checkOneTerm(analyzer, "kenntnisse", "kenntnis");
    checkOneTerm(analyzer, "staates", "staat");
    checkOneTerm(analyzer, "bilder", "bild");
    checkOneTerm(analyzer, "boote", "boot");
    checkOneTerm(analyzer, "götter", "gott");
    checkOneTerm(analyzer, "äpfel", "apfel");
  }
  
  /** Test against a vocabulary from the reference impl */
  public void testVocabulary() throws IOException {
    assertVocabulary(analyzer, getDataFile("deminimaltestdata.zip"), "deminimal.txt");
  }
}