1 /*
   2  * Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 package com.foo;
  25 
  26 import java.io.*;
  27 import java.net.*;
  28 import java.util.*;
  29 import static java.util.ResourceBundle.Control.*;
  30 
  31 public class UserXMLControl extends ResourceBundle.Control {
  32     @Override
  33     public List<String> getFormats(String baseName) {
  34         if (baseName == null) {
  35             throw new NullPointerException();
  36         }
  37         return Arrays.asList("xml");
  38     }
  39 
  40     @Override
  41     public ResourceBundle newBundle(String baseName, Locale locale,
  42                                     String format,
  43                                     ClassLoader loader,
  44                                     boolean reload)
  45         throws IllegalAccessException,
  46                InstantiationException, IOException {
  47         if (baseName == null || locale == null
  48             || format == null || loader == null) {
  49             throw new NullPointerException();
  50         }
  51         ResourceBundle bundle = null;
  52         if (format.equals("xml")) {
  53             String bundleName = toBundleName(baseName, locale);
  54             String resourceName = toResourceName(bundleName, format);
  55             URL url = loader.getResource(resourceName);
  56             if (url != null) {
  57                 URLConnection connection = url.openConnection();
  58                 if (connection != null) {
  59                     if (reload) {
  60                         // disable caches if reloading
  61                         connection.setUseCaches(false);
  62                     }
  63                     try (InputStream stream = connection.getInputStream()) {
  64                         if (stream != null) {
  65                             BufferedInputStream bis = new BufferedInputStream(stream);
  66                             bundle = new XMLResourceBundle(bis);
  67                         }
  68                     }
  69                 }
  70             }
  71         }
  72         return bundle;
  73     }
  74 
  75     private static class XMLResourceBundle extends ResourceBundle {
  76         private Properties props;
  77 
  78         XMLResourceBundle(InputStream stream) throws IOException {
  79             props = new Properties();
  80             props.loadFromXML(stream);
  81         }
  82 
  83         protected Object handleGetObject(String key) {
  84             if (key == null) {
  85                 throw new NullPointerException();
  86             }
  87             return props.get(key);
  88         }
  89 
  90         public Enumeration<String> getKeys() {
  91             // Not implemented
  92             return null;
  93         }
  94     }
  95 }