com.liferay.portal.kernel.util.CollatorUtil.java Source code

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Here is the source code for com.liferay.portal.kernel.util.CollatorUtil.java

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.portal.kernel.util;

import com.liferay.petra.string.StringPool;
import com.liferay.portal.kernel.configuration.Filter;
import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;

import java.io.FileInputStream;
import java.io.InputStream;

import java.text.Collator;
import java.text.ParseException;
import java.text.RuleBasedCollator;

import java.util.Locale;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author Preston Crary
 */
public class CollatorUtil {

    public static Collator getInstance(Locale locale) {
        String rules = _rules.get(locale);

        if (rules == null) {
            String languageId = LocaleUtil.toLanguageId(locale);

            rules = PropsUtil.get("collator.rules", new Filter(languageId));

            if (Validator.isNull(rules)) {
                rules = StringPool.BLANK;
            } else if (rules.startsWith("file:")) {
                try {
                    try (InputStream is = new FileInputStream(rules.substring(5))) {

                        rules = StringUtil.read(is);
                    }
                } catch (Exception e) {
                    _log.error(e, e);

                    rules = StringPool.BLANK;
                }
            }

            _rules.put(locale, rules);
        }

        if (!rules.equals(StringPool.BLANK)) {
            try {
                return new RuleBasedCollator(rules);
            } catch (ParseException pe) {
                _log.error(pe, pe);

                _rules.put(locale, StringPool.BLANK);
            }
        }

        return Collator.getInstance(locale);
    }

    private static final Log _log = LogFactoryUtil.getLog(CollatorUtil.class);

    private static final Map<Locale, String> _rules = new ConcurrentHashMap<>();

}