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 map.put("utf-16", UTF_16.INSTANCE);
90 map.put("utf-16be", UTF_16BE.INSTANCE);
91 map.put("utf-16le", UTF_16LE.INSTANCE);
92 cache = map;
93 }
94 return map;
95 }
96
97 // Private ASCII-only version, optimized for interpretation during startup
98 //
99 private static String toLower(String s) {
100 int n = s.length();
101 boolean allLower = true;
102 for (int i = 0; i < n; i++) {
103 int c = s.charAt(i);
104 if (((c - 'A') | ('Z' - c)) >= 0) {
105 allLower = false;
106 break;
107 }
108 }
109 if (allLower)
110 return s;
111 StringBuilder sb = new StringBuilder(n);
112 for (int i = 0; i < n; i++) {
113 int c = s.charAt(i);
114 if (((c - 'A') | ('Z' - c)) >= 0)
115 sb.append((char)(c + 0x20));
116 else
117 sb.append((char)c);
118 }
119 return sb.toString();
120 }
121
122 private Charset lookup(String charsetName) {
123 init();
124
125 // By checking these built-ins we can avoid initializing Aliases,
126 // Classes and Cache eagerly during bootstrap.
127 //
128 // Initialization of java.nio.charset.StandardCharsets should be
129 // avoided here to minimize time spent in System.initPhase1, as it
130 // may delay initialization of performance critical VM subsystems.
131 String csn;
132 if (charsetName.equals("UTF-8")) {
133 return UTF_8.INSTANCE;
134 } else if (charsetName.equals("US-ASCII")) {
135 return US_ASCII.INSTANCE;
136 } else if (charsetName.equals("ISO-8859-1")) {
137 return ISO_8859_1.INSTANCE;
138 } else {
139 csn = canonicalize(toLower(charsetName));
140 }
141
142 // Check cache first
143 Charset cs = cache().get(csn);
144 if (cs != null)
145 return cs;
146
147 // Do we even support this charset?
148 String cln = classMap().get(csn);
149 if (cln == null)
150 return null;
151
152 // Instantiate the charset and cache it
153 try {
154 @SuppressWarnings("deprecation")
155 Object o = Class.forName(packagePrefix + cln,
156 true,
157 this.getClass().getClassLoader()).newInstance();
158 return cache(csn, (Charset)o);
159 } catch (ClassNotFoundException |
160 IllegalAccessException |
161 InstantiationException x) {
162 return null;
163 }
164 }
165
166 private Charset cache(String csn, Charset cs) {
167 cache().put(csn, cs);
168 return cs;
169 }
170
171 public final Charset charsetForName(String charsetName) {
172 synchronized (this) {
173 return lookup(charsetName);
174 }
175 }
176
177 public final Iterator<Charset> charsets() {
178 Set<String> charsetNames;
179 synchronized (this) {
180 init();
181 // Ensure initialized in synchronized block
182 charsetNames = classMap().keySet();
183 aliasMap();
184 cache();
185 }
186 return new Iterator<Charset>() {
187
188 Iterator<String> i = charsetNames.iterator();
189
190 public boolean hasNext() {
191 return i.hasNext();
192 }
193
194 public Charset next() {
195 String csn = i.next();
196 return lookup(csn);
197 }
198
199 public void remove() {
200 throw new UnsupportedOperationException();
201 }
202
203 };
204 }
205
206 private boolean initialized = false;
207
208 /* provider the sun.nio.cs.map property fir sjis/ms932 mapping hack
209 */
210 private void init() {
211 if (initialized)
212 return;
213 if (!jdk.internal.misc.VM.isBooted())
214 return;
215 initialized = true;
216
217 String map = GetPropertyAction.privilegedGetProperty("sun.nio.cs.map");
218 if (map != null) {
219 Map<String,String> aliasMap = aliasMap();
220 Map<String,String> classMap = classMap();
221 String[] maps = map.split(",");
222 for (int i = 0; i < maps.length; i++) {
223 if (maps[i].equalsIgnoreCase("Windows-31J/Shift_JIS")) {
224 // if we dont have both sjis and ms932, do nothing
225 if (classMap.get("shift_jis") == null ||
226 classMap.get("windows-31j") == null) {
227 break;
228 }
229 aliases_MS932 = new String[] {
230 "MS932", // JDK historical
231 "windows-932",
232 "csWindows31J",
233 "shift-jis",
234 "ms_kanji",
235 "x-sjis",
236 "csShiftJIS",
237 // This alias takes precedence over the actual
238 // Shift_JIS charset itself since aliases are always
239 // resolved first, before looking up canonical names.
240 "shift_jis"
241 };
242 aliases_SJIS = new String[] { "sjis" };
243
244 for (String alias : aliases_MS932) {
245 aliasMap.put(toLower(alias), "windows-31j");
246 }
247 cache().put("shift_jis", null);
248 break;
249 }
250 }
251 }
252 }
253
254 }