package org.apache.lucene.analysis.en;
/*
* 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 static org.apache.lucene.analysis.VocabularyAssert.assertVocabulary;
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.MockTokenizer;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.core.KeywordTokenizer;
/**
* Tests for {@link KStemmer}
*/
public class TestKStemmer extends BaseTokenStreamTestCase {
Analyzer a = new Analyzer() {
@Override
protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
Tokenizer tokenizer = new MockTokenizer(reader, MockTokenizer.WHITESPACE, true);
return new TokenStreamComponents(tokenizer, new KStemFilter(tokenizer));
}
};
/** blast some random strings through the analyzer */
public void testRandomStrings() throws Exception {
checkRandomData(random(), a, 1000*RANDOM_MULTIPLIER);
}
/**
* test the kstemmer optimizations against a bunch of words
* that were stemmed with the original java kstemmer (generated from
* testCreateMap, commented out below).
*/
public void testVocabulary() throws Exception {
assertVocabulary(a, getDataFile("kstemTestData.zip"), "kstem_examples.txt");
}
public void testEmptyTerm() throws IOException {
Analyzer a = new Analyzer() {
@Override
protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
Tokenizer tokenizer = new KeywordTokenizer(reader);
return new TokenStreamComponents(tokenizer, new KStemFilter(tokenizer));
}
};
checkOneTerm(a, "", "");
}
/****** requires original java kstem source code to create map
public void testCreateMap() throws Exception {
String input = getBigDoc();
Reader r = new StringReader(input);
TokenFilter tf = new LowerCaseFilter(new LetterTokenizer(r));
// tf = new KStemFilter(tf);
KStemmer kstem = new KStemmer();
Map<String,String> map = new TreeMap<String,String>();
for(;;) {
Token t = tf.next();
if (t==null) break;
String s = t.termText();
if (map.containsKey(s)) continue;
map.put(s, kstem.stem(s));
}
Writer out = new BufferedWriter(new FileWriter("kstem_examples.txt"));
for (String key : map.keySet()) {
out.write(key);
out.write('\t');
out.write(map.get(key));
out.write('\n');
}
out.close();
}
******/
}