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package com.yahoo.language.lucene;
import com.yahoo.component.provider.ComponentRegistry;
import com.yahoo.config.FileReference;
import com.yahoo.language.Language;
import com.yahoo.language.process.StemMode;
import com.yahoo.language.process.Token;
import org.junit.Test;
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import static org.junit.Assert.assertEquals;
public class LuceneTokenizerTest {
@Test
public void testTokenizer() {
String text = "This is my Text";
var tokenizer = new LuceneTokenizer(new LuceneAnalysisConfig
.Builder()
.configDir(FileReference.mockFileReferenceForUnitTesting(new File(".")))
.build());
Iterable<Token> tokens = tokenizer
.tokenize(text, Language.ENGLISH, StemMode.ALL, true);
assertEquals(List.of("my", "text"), tokenStrings(tokens));
}
@Test
public void testLithuanianTokenizer() {
String text = "Žalgirio mūšio data yra 1410 metai";
var tokenizer = new LuceneTokenizer(new LuceneAnalysisConfig
.Builder()
.configDir(FileReference.mockFileReferenceForUnitTesting(new File(".")))
.build());
Iterable<Token> tokens = tokenizer
.tokenize(text, Language.LITHUANIAN, StemMode.ALL, true);
assertEquals(List.of("žalgir", "mūš", "dat", "1410", "met"), tokenStrings(tokens));
}
private void assertToken(String tokenString, Iterator<Token> tokens) {
Token t = tokens.next();
assertEquals(tokenString, t.getTokenString());
}
private List<Token> iterableToList(Iterable<Token> tokens) {
List<Token> tokenList = new ArrayList<>();
tokens.forEach(tokenList::add);
return tokenList;
}
private List<String> tokenStrings(Iterable<Token> tokens) {
List<String> tokenList = new ArrayList<>();
tokens.forEach(token -> {
tokenList.add(token.getTokenString());
});
return tokenList;
}
@Test
public void testAnalyzerConfiguration() {
String languageCode = Language.ENGLISH.languageCode();
LuceneAnalysisConfig enConfig = new LuceneAnalysisConfig.Builder()
.configDir(FileReference.mockFileReferenceForUnitTesting(new File(".")))
.analysis(
Map.of(languageCode,
new LuceneAnalysisConfig
.Analysis
.Builder()
.tokenFilters(List.of(
new LuceneAnalysisConfig
.Analysis
.TokenFilters
.Builder()
.name("englishMinimalStem"),
new LuceneAnalysisConfig
.Analysis
.TokenFilters
.Builder()
.name("uppercase"))))
).build();
LuceneLinguistics linguistics = new LuceneLinguistics(enConfig, new ComponentRegistry<>());
Iterable<Token> tokens = linguistics
.getTokenizer()
.tokenize("Dogs and cats", Language.ENGLISH, StemMode.ALL, false);
assertEquals(List.of("DOG", "AND", "CAT"), tokenStrings(tokens));
}
@Test
public void testEnglishStemmerAnalyzerConfiguration() {
String languageCode = Language.ENGLISH.languageCode();
LuceneAnalysisConfig enConfig = new LuceneAnalysisConfig.Builder()
.configDir(FileReference.mockFileReferenceForUnitTesting(new File(".")))
.analysis(
Map.of(languageCode,
new LuceneAnalysisConfig.Analysis.Builder().tokenFilters(List.of(
new LuceneAnalysisConfig
.Analysis
.TokenFilters
.Builder()
.name("englishMinimalStem"))))
).build();
LuceneLinguistics linguistics = new LuceneLinguistics(enConfig, new ComponentRegistry<>());
Iterable<Token> tokens = linguistics
.getTokenizer()
.tokenize("Dogs and Cats", Language.ENGLISH, StemMode.ALL, false);
assertEquals(List.of("Dog", "and", "Cat"), tokenStrings(tokens));
}
@Test
public void testStemmerWithStopWords() {
String languageCode = Language.ENGLISH.languageCode();
LuceneAnalysisConfig enConfig = new LuceneAnalysisConfig.Builder()
.configDir(FileReference.mockFileReferenceForUnitTesting(new File(".")))
.analysis(
Map.of(languageCode,
new LuceneAnalysisConfig.Analysis.Builder().tokenFilters(List.of(
new LuceneAnalysisConfig
.Analysis
.TokenFilters
.Builder()
.name("englishMinimalStem"),
new LuceneAnalysisConfig
.Analysis
.TokenFilters
.Builder()
.name("stop")
.conf("words", "stopwords.txt"))))
).build();
LuceneLinguistics linguistics = new LuceneLinguistics(enConfig, new ComponentRegistry<>());
Iterable<Token> tokens = linguistics
.getTokenizer()
.tokenize("Dogs and Cats", Language.ENGLISH, StemMode.ALL, false);
assertEquals(List.of("Dog", "Cat"), tokenStrings(tokens));
}
}
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