com.qwazr.utils.Language.java Source code

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Here is the source code for com.qwazr.utils.Language.java

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/**
 * Copyright 2014-2016 Emmanuel Keller / QWAZR
 *
 * Licensed 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.
 */
package com.qwazr.utils;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;

import com.cybozu.labs.langdetect.Detector;
import com.cybozu.labs.langdetect.DetectorFactory;
import com.cybozu.labs.langdetect.LangDetectException;

public class Language {

    private static final String[] LANG_LIST = { "af", "ar", "bg", "bn", "cs", "da", "de", "el", "en", "es", "et",
            "fa", "fi", "fr", "gu", "he", "hi", "hr", "hu", "id", "it", "ja", "kn", "ko", "lt", "lv", "mk", "ml",
            "mr", "ne", "nl", "no", "pa", "pl", "pt", "ro", "ru", "sk", "sl", "so", "sq", "sv", "sw", "ta", "te",
            "th", "tl", "tr", "uk", "ur", "vi", "zh-cn", "zh-tw" };

    static {
        try {
            List<String> langList = DetectorFactory.getLangList();
            List<String> profiles = new ArrayList<String>(langList.size());
            for (String lang : LANG_LIST) {
                InputStream is = com.cybozu.labs.langdetect.Detector.class.getResourceAsStream("/profiles/" + lang);
                profiles.add(IOUtils.toString(is));
                is.close();
            }
            DetectorFactory.loadProfile(profiles);
        } catch (LangDetectException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Try to detect the language of a given text.
     * 
     * @param text
     *            the text to identify
     * @param length
     *            the number of characters used for the language detection
     * @return the code of the detected language
     * @throws LangDetectException
     *             from langDetect package
     */
    public static final String detect(String text, int length) throws LangDetectException {
        if (StringUtils.isEmpty(text))
            return null;
        Detector detector = DetectorFactory.create();
        detector.setMaxTextLength(length);
        detector.append(text);
        return detector.detect();
    }

    /**
     * Try to detect the language of a given text.
     * 
     * @param text
     *            the text to identify
     * @param length
     *            the number of characters used for the language detection
     * @return the code of the detected language, null if the language is not
     *         detected
     */
    public static final String quietDetect(String text, int length) {
        try {
            return detect(text, length);
        } catch (LangDetectException e) {
            return null;
        }
    }
}