source: java/UTF8ResourceBundleLoader/src/net/oni2/resourcebundle/ResourceBundleControl.java@ 1193

Last change on this file since 1193 was 842, checked in by alloc, 12 years ago

java: UTF8ResourceBundleLoader: Initial import.
File size: 5.4 KB
Line 
1package net.oni2.resourcebundle;
2
3/*
4 * This file is part of aion-emu <aion-emu.com>.
5 *
6 * aion-emu is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * aion-emu is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with aion-emu. If not, see <http://www.gnu.org/licenses/>.
18 */
19//package com.aionemu.commons.utils.i18n;
20
21import java.io.IOException;
22import java.io.InputStream;
23import java.io.InputStreamReader;
24import java.net.URL;
25import java.net.URLConnection;
26import java.security.AccessController;
27import java.security.PrivilegedActionException;
28import java.security.PrivilegedExceptionAction;
29import java.util.Locale;
30import java.util.PropertyResourceBundle;
31import java.util.ResourceBundle;
32
33/**
34 * This class allows us to read ResourceBundles with custom encodings, so we
35 * don't have write \\uxxxx symbols and use utilities like native2ascii to
36 * convert files.
37 * <p/>
38 * <br>
39 *
40 * Usage: For instance we want to load resource bundle "test" from current
41 * deirectory and use english locale. If locale not found, we will use default
42 * file (and ignore default locale).
43 *
44 * <pre>
45 * URLClassLoader loader = new URLClassLoader(new URL[] { new File(&quot;.&quot;).toURI()
46 * .toURL() });
47 *
48 * ResourceBundle rb = ResourceBundle.getBundle(&quot;test&quot;, Locale.ENGLISH, loader,
49 * new ResourceBundleControl(&quot;UTF-8&quot;));
50 *
51 * // English locale not found, use default
52 * if (!rb.getLocale().equals(Locale.ENGLISH)) {
53 * rb = ResourceBundle.getBundle(&quot;test&quot;, Locale.ROOT, loader,
54 * new ResourceBundleControl(&quot;UTF-8&quot;));
55 * }
56 *
57 * System.out.println(rb.getString(&quot;test&quot;));
58 * </pre>
59 *
60 * @author SoulKeeper
61 */
62public class ResourceBundleControl extends ResourceBundle.Control {
63 /**
64 * Encoding which will be used to read resource bundle, by defaults it's
65 * 8859_1
66 */
67 private String encoding = "UTF-8";
68
69 /**
70 * Just empty default constructor
71 */
72 public ResourceBundleControl() {
73 }
74
75 /**
76 * This constructor allows to set encoding that will be used while reading
77 * resource bundle
78 *
79 * @param encoding
80 * encoding to use
81 */
82 public ResourceBundleControl(String encoding) {
83 this.encoding = encoding;
84 }
85
86 /**
87 * This code is just copy-paste with usage {@link java.io.Reader} instead of
88 * {@link java.io.InputStream} to read properties.<br>
89 * <br>
90 *
91 * {@inheritDoc}
92 */
93 @Override
94 public ResourceBundle newBundle(String baseName, Locale locale,
95 String format, ClassLoader loader, boolean reload)
96 throws IllegalAccessException, InstantiationException, IOException {
97 String bundleName = toBundleName(baseName, locale);
98 ResourceBundle bundle = null;
99 if (format.equals("java.class")) {
100 try {
101 @SuppressWarnings({ "unchecked" })
102 Class<? extends ResourceBundle> bundleClass = (Class<? extends ResourceBundle>) loader
103 .loadClass(bundleName);
104
105 // If the class isn't a ResourceBundle subclass, throw a
106 // ClassCastException.
107 if (ResourceBundle.class.isAssignableFrom(bundleClass)) {
108 bundle = bundleClass.newInstance();
109 } else {
110 throw new ClassCastException(bundleClass.getName()
111 + " cannot be cast to ResourceBundle");
112 }
113 } catch (ClassNotFoundException ignored) {
114 }
115 } else if (format.equals("java.properties")) {
116 final String resourceName = toResourceName(bundleName, "properties");
117 final ClassLoader classLoader = loader;
118 final boolean reloadFlag = reload;
119 InputStreamReader isr = null;
120 InputStream stream;
121 try {
122 stream = AccessController
123 .doPrivileged(new PrivilegedExceptionAction<InputStream>() {
124 @Override
125 public InputStream run() throws IOException {
126 InputStream is = null;
127 if (reloadFlag) {
128 URL url = classLoader
129 .getResource(resourceName);
130 if (url != null) {
131 URLConnection connection = url
132 .openConnection();
133 if (connection != null) {
134 // Disable caches to get fresh data
135 // for
136 // reloading.
137 connection.setUseCaches(false);
138 is = connection.getInputStream();
139 }
140 }
141 } else {
142 is = classLoader
143 .getResourceAsStream(resourceName);
144 }
145 return is;
146 }
147 });
148 if (stream != null) {
149 isr = new InputStreamReader(stream, encoding);
150 }
151 } catch (PrivilegedActionException e) {
152 throw (IOException) e.getException();
153 }
154 if (isr != null) {
155 try {
156 bundle = new PropertyResourceBundle(isr);
157 } finally {
158 isr.close();
159 }
160 }
161 } else {
162 throw new IllegalArgumentException("unknown format: " + format);
163 }
164 return bundle;
165 }
166
167 /**
168 * Returns encoding that will be used to read .properties resource bundles
169 *
170 * @return encoding
171 */
172 public String getEncoding() {
173 return encoding;
174 }
175
176 /**
177 * Sets the encoding that will be used to read properties resource bundles
178 *
179 * @param encoding
180 * encoding that will be used for properties
181 */
182 public void setEncoding(String encoding) {
183 this.encoding = encoding;
184 }
185}
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