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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
 */
package com.sun.webkit;

import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Locale;
import java.util.PropertyResourceBundle;
import java.util.ResourceBundle;
import java.util.logging.Level;
import java.util.logging.Logger;

final class LocalizedStrings {
    private final static Logger log = 
        Logger.getLogger(LocalizedStrings.class.getName());

    private final static ResourceBundle BUNDLE =
        ResourceBundle.getBundle("com.sun.webkit.LocalizedStrings",
            Locale.getDefault(), new EncodingResourceBundleControl("utf-8"));

    /** Private ctor to avoid unexpected instantiation */
    private LocalizedStrings() {}

    private static String getLocalizedProperty(String propName) {
        log.log(Level.FINE, "Get property: " + propName);
        String propValue = BUNDLE.getString(propName);
        if ((propValue != null) && (propValue.trim().length() > 0)) {
            log.log(Level.FINE, "Property value: " + propValue);
            return propValue.trim();
        }
        log.log(Level.FINE, "Unknown property value");
        return null;
    }

    private static final class EncodingResourceBundleControl
        extends ResourceBundle.Control
    {
        private final String encoding;

        private EncodingResourceBundleControl(String encoding) {
            this.encoding = encoding;
        }

        @Override
        public ResourceBundle newBundle(String baseName, Locale locale,
                                        String format, ClassLoader loader,
                                        boolean reload)
            throws IllegalAccessException, InstantiationException, IOException
        {
            String bundleName = toBundleName(baseName, locale);
            String resourceName = toResourceName(bundleName, "properties");
            URL resourceURL = loader.getResource(resourceName);
            if (resourceURL != null)
            {
                try
                {
                    return new PropertyResourceBundle(new InputStreamReader(resourceURL.openStream(), encoding));
                }
                catch (Exception z)
                {
                    log.log(Level.FINE, "exception thrown during bundle initialization", z);
                }
            }

            return super.newBundle(baseName, locale, format, loader, reload);
        }
    }
}