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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.language.process;
import com.yahoo.language.Language;
import java.util.ArrayList;
import java.util.List;
/**
* @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen Hult</a>
*/
public class StemmerImpl implements Stemmer {
private final Tokenizer tokenizer;
public StemmerImpl(Tokenizer tokenizer) {
this.tokenizer = tokenizer;
}
@Override
public List<StemList> stem(String input, StemMode stemMode, Language language) {
List<StemList> stems = new ArrayList<>();
for (Token token : tokenizer.tokenize(input, language, stemMode, false)) {
findStems(token, stems);
}
return stems;
}
private void findStems(Token token, List<StemList> out) {
int len;
if (token.isSpecialToken() || (len = token.getNumComponents()) == 0) {
if (token.isIndexable()) {
StemList word = new StemList();
word.add(token.getTokenString()); // takes care of getStem(0)
for (int i = 1; i < token.getNumStems(); i++) {
word.add(token.getStem(i));
}
out.add(word);
}
} else {
for (int i = 0; i < len; ++i) {
findStems(token.getComponent(i), out);
}
}
}
}
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