1 /*
2 * Copyright (c) 1996, 2016, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 /*
27 * (C) Copyright Taligent, Inc. 1996, 1997 - All Rights Reserved
28 * (C) Copyright IBM Corp. 1996 - 1998 - All Rights Reserved
29 *
30 * The original version of this source code and documentation
31 * is copyrighted and owned by Taligent, Inc., a wholly-owned
32 * subsidiary of IBM. These materials are provided under terms
33 * of a License Agreement between Taligent and Sun. This technology
34 * is protected by multiple US and International patents.
35 *
36 * This notice and attribution to Taligent may not be removed.
37 * Taligent is a registered trademark of Taligent, Inc.
38 */
39
40 package java.util;
41
42 import java.io.InputStream;
43 import java.io.InputStreamReader;
44 import java.io.Reader;
45 import java.io.IOException;
46 import java.nio.charset.MalformedInputException;
47 import java.nio.charset.StandardCharsets;
48 import java.nio.charset.UnmappableCharacterException;
49 import sun.security.action.GetPropertyAction;
50 import sun.util.PropertyResourceBundleCharset;
51 import sun.util.ResourceBundleEnumeration;
52
53 /**
54 * <code>PropertyResourceBundle</code> is a concrete subclass of
55 * <code>ResourceBundle</code> that manages resources for a locale
56 * using a set of static strings from a property file. See
57 * {@link ResourceBundle ResourceBundle} for more information about resource
58 * bundles.
59 *
60 * <p>
61 * Unlike other types of resource bundle, you don't subclass
62 * <code>PropertyResourceBundle</code>. Instead, you supply properties
63 * files containing the resource data. <code>ResourceBundle.getBundle</code>
64 * will automatically look for the appropriate properties file and create a
65 * <code>PropertyResourceBundle</code> that refers to it. See
66 * {@link ResourceBundle#getBundle(String, Locale, ClassLoader) ResourceBundle.getBundle}
67 * for a complete description of the search and instantiation strategy.
68 *
69 * <p>
70 * The following <a id="sample">example</a> shows a member of a resource
71 * bundle family with the base name "MyResources".
72 * The text defines the bundle "MyResources_de",
73 * the German member of the bundle family.
74 * This member is based on <code>PropertyResourceBundle</code>, and the text
75 * therefore is the content of the file "MyResources_de.properties"
76 * (a related <a href="ListResourceBundle.html#sample">example</a> shows
77 * how you can add bundles to this family that are implemented as subclasses
78 * of <code>ListResourceBundle</code>).
79 * The keys in this example are of the form "s1" etc. The actual
80 * keys are entirely up to your choice, so long as they are the same as
81 * the keys you use in your program to retrieve the objects from the bundle.
82 * Keys are case-sensitive.
83 * <blockquote>
84 * <pre>
85 * # MessageFormat pattern
86 * s1=Die Platte \"{1}\" enthält {0}.
87 *
88 * # location of {0} in pattern
89 * s2=1
90 *
91 * # sample disk name
92 * s3=Meine Platte
93 *
94 * # first ChoiceFormat choice
95 * s4=keine Dateien
96 *
97 * # second ChoiceFormat choice
98 * s5=eine Datei
99 *
100 * # third ChoiceFormat choice
101 * s6={0,number} Dateien
102 *
103 * # sample date
104 * s7=3. März 1996
105 * </pre>
106 * </blockquote>
107 *
108 * @apiNote
109 * {@code PropertyResourceBundle} can be constructed either
110 * from an {@code InputStream} or a {@code Reader}, which represents a property file.
111 * Constructing a {@code PropertyResourceBundle} instance from an {@code InputStream}
112 * requires that the input stream be encoded in {@code UTF-8}. By default, if a
113 * {@link java.nio.charset.MalformedInputException} or an
114 * {@link java.nio.charset.UnmappableCharacterException} occurs on reading the
115 * input stream, then the {@code PropertyResourceBundle} instance resets to the state
116 * before the exception, re-reads the input stream in {@code ISO-8859-1}, and
117 * continues reading. If the system property
118 * {@code java.util.PropertyResourceBundle.encoding} is set to either
119 * "ISO-8859-1" or "UTF-8", the input stream is solely read in that encoding,
120 * and throws the exception if it encounters an invalid sequence.
121 * If "ISO-8859-1" is specified, characters that cannot be represented in
122 * ISO-8859-1 encoding must be represented by Unicode Escapes as defined in section
123 * 3.3 of <cite>The Java™ Language Specification</cite>
124 * whereas the other constructor which takes a {@code Reader} does not have that limitation.
125 * Other encoding values are ignored for this system property.
126 * The system property is read and evaluated when initializing this class.
127 * Changing or removing the property has no effect after the initialization.
128 *
129 * @implSpec
130 * The implementation of a {@code PropertyResourceBundle} subclass must be
131 * thread-safe if it's simultaneously used by multiple threads. The default
132 * implementations of the non-abstract methods in this class are thread-safe.
133 *
134 * @see ResourceBundle
135 * @see ListResourceBundle
136 * @see Properties
137 * @since 1.1
138 */
139 public class PropertyResourceBundle extends ResourceBundle {
140
141 // Check whether the strict encoding is specified.
142 // The possible encoding is either "ISO-8859-1" or "UTF-8".
143 private static final String encoding = GetPropertyAction
144 .privilegedGetProperty("java.util.PropertyResourceBundle.encoding", "")
145 .toUpperCase(Locale.ROOT);
146
147 /**
148 * Creates a property resource bundle from an {@link java.io.InputStream
149 * InputStream}. This constructor reads the property file in UTF-8 by default.
150 * If a {@link java.nio.charset.MalformedInputException} or an
151 * {@link java.nio.charset.UnmappableCharacterException} occurs on reading the
152 * input stream, then the PropertyResourceBundle instance resets to the state
153 * before the exception, re-reads the input stream in {@code ISO-8859-1} and
154 * continues reading. If the system property
155 * {@code java.util.PropertyResourceBundle.encoding} is set to either
156 * "ISO-8859-1" or "UTF-8", the input stream is solely read in that encoding,
157 * and throws the exception if it encounters an invalid sequence. Other
158 * encoding values are ignored for this system property.
159 * The system property is read and evaluated when initializing this class.
160 * Changing or removing the property has no effect after the initialization.
161 *
162 * @param stream an InputStream that represents a property file
163 * to read from.
164 * @throws IOException if an I/O error occurs
165 * @throws NullPointerException if <code>stream</code> is null
166 * @throws IllegalArgumentException if {@code stream} contains a
167 * malformed Unicode escape sequence.
168 * @throws MalformedInputException if the system property
169 * {@code java.util.PropertyResourceBundle.encoding} is set to "UTF-8"
170 * and {@code stream} contains an invalid UTF-8 byte sequence.
171 * @throws UnmappableCharacterException if the system property
172 * {@code java.util.PropertyResourceBundle.encoding} is set to "UTF-8"
173 * and {@code stream} contains an unmappable UTF-8 byte sequence.
174 */
175 @SuppressWarnings({"unchecked", "rawtypes"})
176 public PropertyResourceBundle (InputStream stream) throws IOException {
177 this(new InputStreamReader(stream,
178 "ISO-8859-1".equals(encoding) ?
179 StandardCharsets.ISO_8859_1.newDecoder() :
180 new PropertyResourceBundleCharset("UTF-8".equals(encoding)).newDecoder()));
181 }
182
183 /**
184 * Creates a property resource bundle from a {@link java.io.Reader
185 * Reader}. Unlike the constructor
186 * {@link #PropertyResourceBundle(java.io.InputStream) PropertyResourceBundle(InputStream)},
187 * there is no limitation as to the encoding of the input property file.
188 *
189 * @param reader a Reader that represents a property file to
190 * read from.
191 * @throws IOException if an I/O error occurs
192 * @throws NullPointerException if <code>reader</code> is null
193 * @throws IllegalArgumentException if a malformed Unicode escape sequence appears
194 * from {@code reader}.
195 * @since 1.6
196 */
197 @SuppressWarnings({"unchecked", "rawtypes"})
198 public PropertyResourceBundle (Reader reader) throws IOException {
199 Properties properties = new Properties();
200 properties.load(reader);
201 lookup = new HashMap(properties);
202 }
203
204 // Implements java.util.ResourceBundle.handleGetObject; inherits javadoc specification.
205 public Object handleGetObject(String key) {
206 if (key == null) {
207 throw new NullPointerException();
208 }
209 return lookup.get(key);
210 }
211
212 /**
213 * Returns an <code>Enumeration</code> of the keys contained in
214 * this <code>ResourceBundle</code> and its parent bundles.
215 *
216 * @return an <code>Enumeration</code> of the keys contained in
217 * this <code>ResourceBundle</code> and its parent bundles.
218 * @see #keySet()
219 */
220 public Enumeration<String> getKeys() {
221 ResourceBundle parent = this.parent;
222 return new ResourceBundleEnumeration(lookup.keySet(),
223 (parent != null) ? parent.getKeys() : null);
224 }
225
226 /**
227 * Returns a <code>Set</code> of the keys contained
228 * <em>only</em> in this <code>ResourceBundle</code>.
229 *
230 * @return a <code>Set</code> of the keys contained only in this
231 * <code>ResourceBundle</code>
232 * @since 1.6
233 * @see #keySet()
234 */
235 protected Set<String> handleKeySet() {
236 return lookup.keySet();
237 }
238
239 // ==================privates====================
240
241 private final Map<String,Object> lookup;
242 }
243