/*

 * 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.

 */

import java.io.BufferedInputStream;

import java.io.InputStream;

import java.io.IOException;

import java.util.Enumeration;

import java.util.Locale;

import java.util.Properties;

import java.util.ResourceBundle;

import java.util.spi.ResourceBundleProvider;

public class MyResourcesProvider implements ResourceBundleProvider {

    @Override

    public ResourceBundle getBundle(String baseName, Locale locale) {

        String xmlName = toXMLName(baseName, locale);

        try (InputStream is = this.getClass().getModule().getResourceAsStream(xmlName)) {

            return new XMLResourceBundle(new BufferedInputStream(is));

        } catch (IOException e) {

            throw new RuntimeException(e);

        }

    }

    private String toXMLName(String baseName, Locale locale) {

        StringBuilder sb = new StringBuilder(baseName.replace('.', '/'));

        String lang = locale.getLanguage();

        if (!lang.isEmpty()) {

            sb.append('_').append(lang);

            String country = locale.getCountry();

            if (!country.isEmpty()) {

                sb.append('_').append(country);

            }

        }

        return sb.append(".xml").toString();

    }

    private static class XMLResourceBundle extends ResourceBundle {

        private Properties props;

        XMLResourceBundle(InputStream stream) throws IOException {

            props = new Properties();

            props.loadFromXML(stream);

        }

        @Override

        protected Object handleGetObject(String key) {

            if (key == null) {

                throw new NullPointerException();

            }

            return props.get(key);

        }

        @Override

        public Enumeration<String> getKeys() {

            // Not implemented

            return null;

        }

    }

}