/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */ 

package rbcp;

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

public class XMLResourceBundleControl 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;
        }
    }
}