1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * https://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 /*
19 * This is not the original file distributed by the Apache Software Foundation
20 * It has been modified by the Hipparchus project
21 */
22 package org.hipparchus.exception;
23
24 import java.io.IOException;
25 import java.io.InputStream;
26 import java.io.InputStreamReader;
27 import java.net.URL;
28 import java.net.URLConnection;
29 import java.util.Locale;
30 import java.util.PropertyResourceBundle;
31 import java.util.ResourceBundle;
32
33 /** Control class loading properties in UTF-8 encoding.
34 * <p>
35 * This class has been very slightly adapted from BalusC answer to question: <a
36 * href="http://stackoverflow.com/questions/4659929/how-to-use-utf-8-in-resource-properties-with-resourcebundle">
37 * How to use UTF-8 in resource properties with ResourceBundle</a>.
38 * </p>
39 */
40 public class UTF8Control extends ResourceBundle.Control {
41
42 /** Empty constructor.
43 * <p>
44 * This constructor is not strictly necessary, but it prevents spurious
45 * javadoc warnings with JDK 18 and later.
46 * </p>
47 * @since 3.0
48 */
49 public UTF8Control() { // NOPMD - unnecessary constructor added intentionally to make javadoc happy
50 // nothing to do
51 }
52
53 /** {@inheritDoc} */
54 @Override
55 public ResourceBundle newBundle(final String baseName, final Locale locale, final String format,
56 final ClassLoader loader, final boolean reload)
57 throws IllegalAccessException, InstantiationException, IOException {
58 // The below is a copy of the default implementation.
59 final String bundleName = toBundleName(baseName, locale);
60 final String resourceName = toResourceName(bundleName, "utf8");
61 ResourceBundle bundle = null;
62 InputStream stream = null;
63 if (reload) {
64 final URL url = loader.getResource(resourceName);
65 if (url != null) {
66 final URLConnection connection = url.openConnection();
67 if (connection != null) {
68 connection.setUseCaches(false);
69 stream = connection.getInputStream();
70 }
71 }
72 } else {
73 stream = loader.getResourceAsStream(resourceName);
74 }
75 if (stream != null) {
76 try { // NOPMD
77 // Only this line is changed to make it to read properties files as UTF-8.
78 bundle = new PropertyResourceBundle(new InputStreamReader(stream, "UTF-8"));
79 } finally {
80 stream.close();
81 }
82 }
83 return bundle;
84 }
85
86 }