UserXMLControl.java

/*
 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.foo;

import java.io.*;
import java.net.*;
import java.util.*;
import static java.util.ResourceBundle.Control.*;

public class UserXMLControl extends ResourceBundle.Control {
    @Override
    public List<String> getFormats(String baseName) {
        if (baseName == null) {
            throw new NullPointerException();
        }
        return Arrays.asList("xml");
    }

    @Override
    public ResourceBundle newBundle(String baseName, Locale locale,
                                    String format,
                                    ClassLoader loader,
                                    boolean reload)
        throws IllegalAccessException,
               InstantiationException, IOException {
        if (baseName == null || locale == null
            || format == null || loader == null) {
            throw new NullPointerException();
        }
        ResourceBundle bundle = null;
        if (format.equals("xml")) {
            String bundleName = toBundleName(baseName, locale);
            String resourceName = toResourceName(bundleName, format);
            URL url = loader.getResource(resourceName);
            if (url != null) {
                URLConnection connection = url.openConnection();
                if (connection != null) {
                    if (reload) {
                        // disable caches if reloading
                        connection.setUseCaches(false);
                    }
                    try (InputStream stream = connection.getInputStream()) {
                        if (stream != null) {
                            BufferedInputStream bis = new BufferedInputStream(stream);
                            bundle = new XMLResourceBundle(bis);
                        }
                    }
                }
            }
        }
        return bundle;
    }

    private static class XMLResourceBundle extends ResourceBundle {
        private Properties props;

        XMLResourceBundle(InputStream stream) throws IOException {
            props = new Properties();
            props.loadFromXML(stream);
        }

        protected Object handleGetObject(String key) {
            if (key == null) {
                throw new NullPointerException();
            }
            return props.get(key);
        }

        public Enumeration<String> getKeys() {
            // Not implemented
            return null;
        }
    }
}