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// Copyright 2020 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.language.opennlp;
import com.google.common.base.Optional;
import com.optimaize.langdetect.LanguageDetector;
import com.optimaize.langdetect.LanguageDetectorBuilder;
import com.optimaize.langdetect.i18n.LdLocale;
import com.optimaize.langdetect.ngram.NgramExtractors;
import com.optimaize.langdetect.profiles.LanguageProfile;
import com.optimaize.langdetect.profiles.LanguageProfileReader;
import com.optimaize.langdetect.text.CommonTextObjectFactories;
import com.optimaize.langdetect.text.TextObjectFactory;
import com.yahoo.language.Language;
import com.yahoo.language.detect.Detection;
import com.yahoo.language.detect.Detector;
import com.yahoo.language.detect.Hint;
import com.yahoo.language.simple.SimpleDetector;
import com.yahoo.text.Utf8;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.ByteBuffer;
import java.util.List;
import java.util.Locale;
import java.util.logging.Logger;
import java.util.logging.Level;
/**
* Detects the language of some sample text using SimpleDetector for CJK and Optimaize otherwise.
*
* @author bratseth
*/
public class OptimaizeDetector implements Detector {
static private Object initGuard = new Object();
static private TextObjectFactory textObjectFactory = null;
static private LanguageDetector languageDetector = null;
static private final Logger log = Logger.getLogger(OptimaizeDetector.class.getName());
static private void initOptimaize() {
synchronized (initGuard) {
if ((textObjectFactory != null) && (languageDetector != null)) return;
// origin: https://github.com/optimaize/language-detector
// load all languages:
List<LanguageProfile> languageProfiles;
try {
languageProfiles = new LanguageProfileReader().readAllBuiltIn();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
//build language detector:
languageDetector = LanguageDetectorBuilder.create(NgramExtractors.standard())
.withProfiles(languageProfiles)
.build();
//create a text object factory
textObjectFactory = CommonTextObjectFactories.forDetectingOnLargeText();
}
}
private SimpleDetector simpleDetector = new SimpleDetector();
public OptimaizeDetector() {
initOptimaize();
}
@Override
public Detection detect(byte[] input, int offset, int length, Hint hint) {
return new Detection(guessLanguage(input, offset, length), simpleDetector.guessEncoding(input), false);
}
@Override
public Detection detect(ByteBuffer input, Hint hint) {
byte[] buf = new byte[input.remaining()];
input.get(buf, 0, buf.length);
return detect(buf, 0, buf.length, hint);
}
@Override
public Detection detect(String input, Hint hint) {
return new Detection(guessLanguage(input), Utf8.getCharset().name(), false);
}
private Language guessLanguage(byte[] buf, int offset, int length) {
return guessLanguage(Utf8.toString(buf, offset, length));
}
public Language guessLanguage(String input) {
if (input == null || input.length() == 0) return Language.UNKNOWN;
Language result = simpleDetector.guessLanguage(input);
if (result != Language.UNKNOWN) return result;
return guessLanguageUsingOptimaize(input);
}
private static Language guessLanguageUsingOptimaize(String input) {
Optional<LdLocale> result = languageDetector.detect(textObjectFactory.forText(input));
if ( ! result.isPresent()) return Language.UNKNOWN;
log.log(Level.FINE, "guessing language "+result.get()+" from input: "+input);
return Language.fromLocale(new Locale(result.get().getLanguage()));
}
}
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