1 /*
2 * Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation. Oracle designates this
9 * particular file as subject to the "Classpath" exception as provided
10 * by Oracle in the LICENSE file that accompanied this code.
11 *
12 * This code is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * version 2 for more details (a copy is included in the LICENSE file that
16 * accompanied this code).
17 *
18 * You should have received a copy of the GNU General Public License version
19 * 2 along with this work; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 *
22 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
23 * or visit www.oracle.com if you need additional information or have any
24 * questions.
25 *
26 */
27
28 // -- This file was mechanically generated: Do not edit! -- //
29
30 package sun.nio.cs;
31
32 import java.nio.charset.Charset;
33 import java.nio.charset.spi.CharsetProvider;
34 import java.util.Iterator;
35 import java.util.Map;
36 import java.util.Set;
37 import jdk.internal.vm.annotation.Stable;
38 import sun.security.action.GetPropertyAction;
39
40 public class StandardCharsets extends CharsetProvider {
41
42 _INCLUDE_ALIASES_TABLES_
43 _INCLUDE_ALIASES_MAP_
44 _INCLUDE_CLASSES_MAP_
45 _INCLUDE_CACHE_MAP_
46
47 // Maps canonical names to class names
48 private @Stable Map<String,String> classMap;
49
50 // Maps alias names to canonical names
51 private @Stable Map<String,String> aliasMap;
52
53 // Maps canonical names to cached instances
54 private @Stable Map<String,Charset> cache;
55
56 private static final String packagePrefix = "sun.nio.cs.";
57
58 public StandardCharsets() {
59 }
60
61 private String canonicalize(String csn) {
62 String acn = aliasMap().get(csn);
63 return (acn != null) ? acn : csn;
64 }
65
66 private Map<String,String> aliasMap() {
67 Map<String,String> map = aliasMap;
68 if (map == null) {
69 aliasMap = map = new Aliases();
70 }
71 return map;
72 }
73
74 private Map<String,String> classMap() {
75 Map<String,String> map = classMap;
76 if (map == null) {
77 classMap = map = new Classes();
78 }
79 return map;
80 }
81
82 private Map<String,Charset> cache() {
83 Map<String,Charset> map = cache;
84 if (map == null) {
85 map = new Cache();
86 map.put("utf-8", UTF_8.INSTANCE);
87 map.put("iso-8859-1", ISO_8859_1.INSTANCE);
88 map.put("us-ascii", US_ASCII.INSTANCE);
89 cache = map;
90 }
91 return map;
92 }
93
94 // Private ASCII-only version, optimized for interpretation during startup
95 //
96 private static String toLower(String s) {
97 int n = s.length();
98 boolean allLower = true;
99 for (int i = 0; i < n; i++) {
100 int c = s.charAt(i);
101 if (((c - 'A') | ('Z' - c)) >= 0) {
102 allLower = false;
103 break;
104 }
105 }
106 if (allLower)
107 return s;
108 StringBuilder sb = new StringBuilder(n);
109 for (int i = 0; i < n; i++) {
110 int c = s.charAt(i);
111 if (((c - 'A') | ('Z' - c)) >= 0)
112 sb.append((char)(c + 0x20));
113 else
114 sb.append((char)c);
115 }
116 return sb.toString();
117 }
118
119 private Charset lookup(String charsetName) {
120 init();
121
122 // By checking these built-ins we can avoid initializing Aliases and
123 // Classes eagerly during bootstrap
124 String csn;
125 if (charsetName.equals("UTF-8")) {
126 return UTF_8.INSTANCE;
127 } else if (charsetName.equals("US-ASCII")) {
128 return US_ASCII.INSTANCE;
129 } else if (charsetName.equals("ISO-8859-1")) {
130 return ISO_8859_1.INSTANCE;
131 } else {
132 csn = canonicalize(toLower(charsetName));
133 }
134
135 // Check cache first
136 Charset cs = cache().get(csn);
137 if (cs != null)
138 return cs;
139
140 // Do we even support this charset?
141 String cln = classMap().get(csn);
142 if (cln == null)
143 return null;
144
145 // Instantiate the charset and cache it
146 try {
147 @SuppressWarnings("deprecation")
148 Object o = Class.forName(packagePrefix + cln,
149 true,
150 this.getClass().getClassLoader()).newInstance();
151 return cache(csn, (Charset)o);
152 } catch (ClassNotFoundException |
153 IllegalAccessException |
154 InstantiationException x) {
155 return null;
156 }
157 }
158
159 private Charset cache(String csn, Charset cs) {
160 cache().put(csn, cs);
161 return cs;
162 }
163
164 public final Charset charsetForName(String charsetName) {
165 synchronized (this) {
166 return lookup(charsetName);
167 }
168 }
169
170 public final Iterator<Charset> charsets() {
171 Set<String> charsetNames;
172 synchronized (this) {
173 init();
174 // Ensure initialized in synchronized block
175 charsetNames = classMap().keySet();
176 aliasMap();
177 cache();
178 }
179 return new Iterator<Charset>() {
180
181 Iterator<String> i = charsetNames.iterator();
182
183 public boolean hasNext() {
184 return i.hasNext();
185 }
186
187 public Charset next() {
188 String csn = i.next();
189 return lookup(csn);
190 }
191
192 public void remove() {
193 throw new UnsupportedOperationException();
194 }
195
196 };
197 }
198
199 private boolean initialized = false;
200
201 /* provider the sun.nio.cs.map property fir sjis/ms932 mapping hack
202 */
203 private void init() {
204 if (initialized)
205 return;
206 if (!jdk.internal.misc.VM.isBooted())
207 return;
208 initialized = true;
209
210 String map = GetPropertyAction.privilegedGetProperty("sun.nio.cs.map");
211 if (map != null) {
212 Map<String,String> aliasMap = aliasMap();
213 Map<String,String> classMap = classMap();
214 String[] maps = map.split(",");
215 for (int i = 0; i < maps.length; i++) {
216 if (maps[i].equalsIgnoreCase("Windows-31J/Shift_JIS")) {
217 // if we dont have both sjis and ms932, do nothing
218 if (classMap.get("shift_jis") == null ||
219 classMap.get("windows-31j") == null) {
220 break;
221 }
222 aliases_MS932 = new String[] {
223 "MS932", // JDK historical
224 "windows-932",
225 "csWindows31J",
226 "shift-jis",
227 "ms_kanji",
228 "x-sjis",
229 "csShiftJIS",
230 // This alias takes precedence over the actual
231 // Shift_JIS charset itself since aliases are always
232 // resolved first, before looking up canonical names.
233 "shift_jis"
234 };
235 aliases_SJIS = new String[] { "sjis" };
236
237 for (String alias : aliases_MS932) {
238 aliasMap.put(toLower(alias), "windows-31j");
239 }
240 cache().put("shift_jis", null);
241 break;
242 }
243 }
244 }
245 }
246
247 }