001    /**
002     * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.kernel.language;
016    
017    import com.liferay.portal.kernel.concurrent.ConcurrentReferenceValueHashMap;
018    import com.liferay.portal.kernel.memory.FinalizeManager;
019    import com.liferay.portal.kernel.util.StringPool;
020    
021    import java.io.IOException;
022    import java.io.InputStream;
023    import java.io.InputStreamReader;
024    
025    import java.net.URL;
026    import java.net.URLConnection;
027    
028    import java.util.Locale;
029    import java.util.Map;
030    import java.util.PropertyResourceBundle;
031    import java.util.ResourceBundle;
032    import java.util.ResourceBundle.Control;
033    
034    /**
035     * @author Raymond Aug??
036     * @author Shuyang Zhou
037     */
038    public class UTF8Control extends Control {
039    
040            public static final UTF8Control INSTANCE = new UTF8Control();
041    
042            @Override
043            public Locale getFallbackLocale(String baseName, Locale locale) {
044                    return null;
045            }
046    
047            @Override
048            public ResourceBundle newBundle(
049                            String baseName, Locale locale, String format,
050                            ClassLoader classLoader, boolean reload)
051                    throws IOException {
052    
053                    URL url = classLoader.getResource(
054                            toResourceName(toBundleName(baseName, locale), "properties"));
055    
056                    if (url == null) {
057                            return null;
058                    }
059    
060                    URLConnection urlConnection = url.openConnection();
061    
062                    urlConnection.setUseCaches(!reload);
063    
064                    if (!reload) {
065                            CachedResourceBundle cachedResourceBundle =
066                                    _cachedResourceBundles.get(url);
067    
068                            if (cachedResourceBundle != null) {
069                                    if (urlConnection.getLastModified() <=
070                                                    cachedResourceBundle.getLastModified()) {
071    
072                                            return cachedResourceBundle.getResourceBundle();
073                                    }
074                            }
075                    }
076    
077                    try (InputStream inputStream = urlConnection.getInputStream()) {
078                            ResourceBundle resourceBundle = new PropertyResourceBundle(
079                                    new InputStreamReader(inputStream, StringPool.UTF8));
080    
081                            CachedResourceBundle cachedResourceBundle =
082                                    new CachedResourceBundle(
083                                            resourceBundle, urlConnection.getLastModified());
084    
085                            _cachedResourceBundles.put(url, cachedResourceBundle);
086    
087                            return resourceBundle;
088                    }
089            }
090    
091            private static final Map<URL, CachedResourceBundle> _cachedResourceBundles =
092                    new ConcurrentReferenceValueHashMap<>(
093                            FinalizeManager.SOFT_REFERENCE_FACTORY);
094    
095            private static final class CachedResourceBundle {
096    
097                    public CachedResourceBundle(
098                            ResourceBundle resourceBundle, long lastModified) {
099    
100                            _resourceBundle = resourceBundle;
101                            _lastModified = lastModified;
102                    }
103    
104                    public long getLastModified() {
105                            return _lastModified;
106                    }
107    
108                    public ResourceBundle getResourceBundle() {
109                            return _resourceBundle;
110                    }
111    
112                    private final long _lastModified;
113                    private final ResourceBundle _resourceBundle;
114    
115            }
116    
117    }