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

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Here is the source code for com.liferay.portal.kernel.util.CacheResourceBundleLoader.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.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;

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

/**
 * @author Carlos Sierra Andrs
 */
public class CacheResourceBundleLoader implements ResourceBundleLoader {

    public CacheResourceBundleLoader(ResourceBundleLoader resourceBundleLoader) {

        _resourceBundleLoader = resourceBundleLoader;
    }

    @Override
    public ResourceBundle loadResourceBundle(Locale locale) {
        ResourceBundle resourceBundle = _resourceBundles.get(locale);

        if (resourceBundle == _nullResourceBundle) {
            return null;
        }

        if (resourceBundle == null) {
            try {
                resourceBundle = _resourceBundleLoader.loadResourceBundle(locale);
            } catch (Exception e) {
                if (_log.isDebugEnabled()) {
                    _log.debug(e, e);
                }
            }

            if (resourceBundle == null) {
                _resourceBundles.put(locale, _nullResourceBundle);
            } else {
                _resourceBundles.put(locale, resourceBundle);
            }
        }

        return resourceBundle;
    }

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

    private static final ResourceBundle _nullResourceBundle = new ResourceBundle() {

        @Override
        public Enumeration<String> getKeys() {
            throw new UnsupportedOperationException();
        }

        @Override
        protected Object handleGetObject(String key) {
            throw new UnsupportedOperationException();
        }

    };

    private final ResourceBundleLoader _resourceBundleLoader;
    private final Map<Locale, ResourceBundle> _resourceBundles = new ConcurrentHashMap<>();

}