EncodedResourceControl.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.github.rodionmoiseev.c10n.share;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.Locale;
import java.util.PropertyResourceBundle;
import java.util.ResourceBundle;

public class EncodedResourceControl extends ResourceBundle.Control {
    private final String charsetName;

    public EncodedResourceControl(String charsetName) {
        this.charsetName = charsetName;
    }

    @Override
    public ResourceBundle newBundle(String baseName, Locale locale,
                                    String format, ClassLoader loader, boolean reload)
            throws IllegalAccessException, InstantiationException, IOException {
        if (format.equals("java.properties")) {
            String bundleName = toBundleName(baseName, locale);
            final String resourceName = toResourceName(bundleName, "properties");
            final ClassLoader classLoader = loader;
            final boolean reloadFlag = reload;
            InputStream stream;
            try {
                stream = AccessController
                        .doPrivileged(new PrivilegedExceptionAction<InputStream>() {
                            public InputStream run() throws IOException {
                                InputStream is = null;
                                if (reloadFlag) {
                                    URL url = classLoader
                                            .getResource(resourceName);
                                    if (url != null) {
                                        URLConnection connection = url
                                                .openConnection();
                                        if (connection != null) {
                                            // Disable caches to get
                                            // fresh data for
                                            // reloading.
                                            connection.setUseCaches(false);
                                            is = connection.getInputStream();
                                        }
                                    }
                                } else {
                                    is = classLoader
                                            .getResourceAsStream(resourceName);
                                }
                                return is;
                            }
                        });
            } catch (PrivilegedActionException e) {
                throw (IOException) e.getException();
            }
            try {
                return new PropertyResourceBundle(new InputStreamReader(stream, charsetName));
            } finally {
                stream.close();
            }
        }
        return super.newBundle(baseName, locale, format, loader, reload);
    }
}