package org.apache.lucene.analysis.snowball;
/**
* 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.BaseTokenStreamTestCase;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.ReusableAnalyzerBase;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.index.Payload;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.KeywordTokenizer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.FlagsAttribute;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.tokenattributes.PayloadAttribute;
import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
import org.apache.lucene.analysis.tokenattributes.TypeAttribute;
import org.apache.lucene.util.Version;
public class TestSnowball extends BaseTokenStreamTestCase {
public void testEnglish() throws Exception {
Analyzer a = new SnowballAnalyzer(TEST_VERSION_CURRENT, "English");
assertAnalyzesTo(a, "he abhorred accents",
new String[]{"he", "abhor", "accent"});
}
public void testStopwords() throws Exception {
Analyzer a = new SnowballAnalyzer(TEST_VERSION_CURRENT, "English",
StandardAnalyzer.STOP_WORDS_SET);
assertAnalyzesTo(a, "the quick brown fox jumped",
new String[]{"quick", "brown", "fox", "jump"});
}
/**
* Test english lowercasing. Test both cases (pre-3.1 and post-3.1) to ensure
* we lowercase I correct for non-Turkish languages in either case.
*/
public void testEnglishLowerCase() throws Exception {
Analyzer a = new SnowballAnalyzer(TEST_VERSION_CURRENT, "English");
assertAnalyzesTo(a, "cryogenic", new String[] { "cryogen" });
assertAnalyzesTo(a, "CRYOGENIC", new String[] { "cryogen" });
Analyzer b = new SnowballAnalyzer(Version.LUCENE_30, "English");
assertAnalyzesTo(b, "cryogenic", new String[] { "cryogen" });
assertAnalyzesTo(b, "CRYOGENIC", new String[] { "cryogen" });
}
/**
* Test turkish lowercasing
*/
public void testTurkish() throws Exception {
Analyzer a = new SnowballAnalyzer(TEST_VERSION_CURRENT, "Turkish");
assertAnalyzesTo(a, "ağacı", new String[] { "ağaç" });
assertAnalyzesTo(a, "AĞACI", new String[] { "ağaç" });
}
/**
* Test turkish lowercasing (old buggy behavior)
* @deprecated Remove this when support for 3.0 indexes is no longer required
*/
@Deprecated
public void testTurkishBWComp() throws Exception {
Analyzer a = new SnowballAnalyzer(Version.LUCENE_30, "Turkish");
// AĞACI in turkish lowercases to ağacı, but with lowercase filter ağaci.
// this fails due to wrong casing, because the stemmer
// will only remove -ı, not -i
assertAnalyzesTo(a, "ağacı", new String[] { "ağaç" });
assertAnalyzesTo(a, "AĞACI", new String[] { "ağaci" });
}
public void testReusableTokenStream() throws Exception {
Analyzer a = new SnowballAnalyzer(TEST_VERSION_CURRENT, "English");
assertAnalyzesToReuse(a, "he abhorred accents",
new String[]{"he", "abhor", "accent"});
assertAnalyzesToReuse(a, "she abhorred him",
new String[]{"she", "abhor", "him"});
}
public void testFilterTokens() throws Exception {
SnowballFilter filter = new SnowballFilter(new TestTokenStream(), "English");
CharTermAttribute termAtt = filter.getAttribute(CharTermAttribute.class);
OffsetAttribute offsetAtt = filter.getAttribute(OffsetAttribute.class);
TypeAttribute typeAtt = filter.getAttribute(TypeAttribute.class);
PayloadAttribute payloadAtt = filter.getAttribute(PayloadAttribute.class);
PositionIncrementAttribute posIncAtt = filter.getAttribute(PositionIncrementAttribute.class);
FlagsAttribute flagsAtt = filter.getAttribute(FlagsAttribute.class);
filter.incrementToken();
assertEquals("accent", termAtt.toString());
assertEquals(2, offsetAtt.startOffset());
assertEquals(7, offsetAtt.endOffset());
assertEquals("wrd", typeAtt.type());
assertEquals(3, posIncAtt.getPositionIncrement());
assertEquals(77, flagsAtt.getFlags());
assertEquals(new Payload(new byte[]{0,1,2,3}), payloadAtt.getPayload());
}
private final class TestTokenStream extends TokenStream {
private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
private final OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class);
private final TypeAttribute typeAtt = addAttribute(TypeAttribute.class);
private final PayloadAttribute payloadAtt = addAttribute(PayloadAttribute.class);
private final PositionIncrementAttribute posIncAtt = addAttribute(PositionIncrementAttribute.class);
private final FlagsAttribute flagsAtt = addAttribute(FlagsAttribute.class);
TestTokenStream() {
super();
}
@Override
public boolean incrementToken() {
clearAttributes();
termAtt.setEmpty().append("accents");
offsetAtt.setOffset(2, 7);
typeAtt.setType("wrd");
posIncAtt.setPositionIncrement(3);
payloadAtt.setPayload(new Payload(new byte[]{0,1,2,3}));
flagsAtt.setFlags(77);
return true;
}
}
public void testEmptyTerm() throws IOException {
String langs[] = {
"Armenian", "Basque", "Catalan", "Danish", "Dutch", "English",
"Finnish", "French", "German2", "German", "Hungarian", "Irish",
"Italian", "Kp", "Lovins", "Norwegian", "Porter", "Portuguese",
"Romanian", "Russian", "Spanish", "Swedish", "Turkish"
};
for (final String lang : langs) {
Analyzer a = new ReusableAnalyzerBase() {
@Override
protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
Tokenizer tokenizer = new KeywordTokenizer(reader);
return new TokenStreamComponents(tokenizer, new SnowballFilter(tokenizer, lang));
}
};
checkOneTermReuse(a, "", "");
}
}
}