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| 1 | +/* | |
| 2 | + * Copyright (c) 1998, 2010, 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 | +package sun.io; | |
| 27 | + | |
| 28 | +import java.io.UnsupportedEncodingException; | |
| 29 | +import java.lang.ref.SoftReference; | |
| 30 | +import java.util.Properties; | |
| 31 | + | |
| 32 | +/** | |
| 33 | + * Package-private utility class that caches the default converter classes and | |
| 34 | + * provides other logic common to both the ByteToCharConverter and | |
| 35 | + * CharToByteConverter classes. | |
| 36 | + * | |
| 37 | + * @author Mark Reinhold | |
| 38 | + * @since 1.2 | |
| 39 | + * | |
| 40 | + * @deprecated Replaced by {@link java.nio.charset}. THIS API WILL BE | |
| 41 | + * REMOVED IN J2SE 1.6. | |
| 42 | + */ | |
| 43 | +@Deprecated | |
| 44 | +public class Converters { | |
| 45 | + | |
| 46 | + private Converters() { } /* To prevent instantiation */ | |
| 47 | + | |
| 48 | + /* Lock for all static fields in this class */ | |
| 49 | + private static Object lock = Converters.class; | |
| 50 | + | |
| 51 | + /* Cached values of system properties */ | |
| 52 | + private static String converterPackageName = null; /* file.encoding.pkg */ | |
| 53 | + private static String defaultEncoding = null; /* file.encoding */ | |
| 54 | + | |
| 55 | + /* Converter type constants and names */ | |
| 56 | + public static final int BYTE_TO_CHAR = 0; | |
| 57 | + public static final int CHAR_TO_BYTE = 1; | |
| 58 | + private static final String[] converterPrefix = { "ByteToChar", | |
| 59 | + "CharToByte" }; | |
| 60 | + | |
| 61 | + | |
| 62 | + // -- Converter class cache -- | |
| 63 | + | |
| 64 | + private static final int CACHE_SIZE = 3; | |
| 65 | + | |
| 66 | + /* For the default charset, whatever it turns out to be */ | |
| 67 | + private static final Object DEFAULT_NAME = new Object(); | |
| 68 | + | |
| 69 | + /* Cached converter classes, CACHE_SIZE per converter type. Each cache | |
| 70 | + * entry is a soft reference to a two-object array; the first element of | |
| 71 | + * the array is the converter class, the second is an object (typically a | |
| 72 | + * string) representing the encoding name that was used to request the | |
| 73 | + * converter, e.g., | |
| 74 | + * | |
| 75 | + * ((Object[])classCache[CHAR_TO_BYTE][i].get())[0] | |
| 76 | + * | |
| 77 | + * will be a CharToByteConverter and | |
| 78 | + * | |
| 79 | + * ((Object[])classCache[CHAR_TO_BYTE][i].get())[1] | |
| 80 | + * | |
| 81 | + * will be the string encoding name used to request it, assuming that cache | |
| 82 | + * entry i is valid. | |
| 83 | + * | |
| 84 | + * Ordinarily we'd do this with a private static utility class, but since | |
| 85 | + * this code can be involved in the startup sequence it's important to keep | |
| 86 | + * the footprint down. | |
| 87 | + */ | |
| 88 | + @SuppressWarnings("unchecked") | |
| 89 | + private static SoftReference<Object[]>[][] classCache | |
| 90 | + = (SoftReference<Object[]>[][]) new SoftReference<?>[][] { | |
| 91 | + new SoftReference<?>[CACHE_SIZE], | |
| 92 | + new SoftReference<?>[CACHE_SIZE] | |
| 93 | + }; | |
| 94 | + | |
| 95 | + private static void moveToFront(Object[] oa, int i) { | |
| 96 | + Object ob = oa[i]; | |
| 97 | + for (int j = i; j > 0; j--) | |
| 98 | + oa[j] = oa[j - 1]; | |
| 99 | + oa[0] = ob; | |
| 100 | + } | |
| 101 | + | |
| 102 | + private static Class<?> cache(int type, Object encoding) { | |
| 103 | + SoftReference<Object[]>[] srs = classCache[type]; | |
| 104 | + for (int i = 0; i < CACHE_SIZE; i++) { | |
| 105 | + SoftReference<Object[]> sr = srs[i]; | |
| 106 | + if (sr == null) | |
| 107 | + continue; | |
| 108 | + Object[] oa = sr.get(); | |
| 109 | + if (oa == null) { | |
| 110 | + srs[i] = null; | |
| 111 | + continue; | |
| 112 | + } | |
| 113 | + if (oa[1].equals(encoding)) { | |
| 114 | + moveToFront(srs, i); | |
| 115 | + return (Class<?>)oa[0]; | |
| 116 | + } | |
| 117 | + } | |
| 118 | + return null; | |
| 119 | + } | |
| 120 | + | |
| 121 | + private static Class<?> cache(int type, Object encoding, Class<?> c) { | |
| 122 | + SoftReference<Object[]>[] srs = classCache[type]; | |
| 123 | + srs[CACHE_SIZE - 1] = new SoftReference<>(new Object[] { c, encoding }); | |
| 124 | + moveToFront(srs, CACHE_SIZE - 1); | |
| 125 | + return c; | |
| 126 | + } | |
| 127 | + | |
| 128 | + /* Used to avoid doing expensive charset lookups for charsets that are not | |
| 129 | + * yet directly supported by NIO. | |
| 130 | + */ | |
| 131 | + public static boolean isCached(int type, String encoding) { | |
| 132 | + synchronized (lock) { | |
| 133 | + SoftReference<Object[]>[] srs = classCache[type]; | |
| 134 | + for (int i = 0; i < CACHE_SIZE; i++) { | |
| 135 | + SoftReference<Object[]> sr = srs[i]; | |
| 136 | + if (sr == null) | |
| 137 | + continue; | |
| 138 | + Object[] oa = sr.get(); | |
| 139 | + if (oa == null) { | |
| 140 | + srs[i] = null; | |
| 141 | + continue; | |
| 142 | + } | |
| 143 | + if (oa[1].equals(encoding)) | |
| 144 | + return true; | |
| 145 | + } | |
| 146 | + return false; | |
| 147 | + } | |
| 148 | + } | |
| 149 | + | |
| 150 | + | |
| 151 | + | |
| 152 | + /** Get the name of the converter package */ | |
| 153 | + private static String getConverterPackageName() { | |
| 154 | + String cp = converterPackageName; | |
| 155 | + if (cp != null) return cp; | |
| 156 | + java.security.PrivilegedAction<String> pa = | |
| 157 | + new sun.security.action.GetPropertyAction("file.encoding.pkg"); | |
| 158 | + cp = java.security.AccessController.doPrivileged(pa); | |
| 159 | + if (cp != null) { | |
| 160 | + /* Property is set, so take it as the true converter package */ | |
| 161 | + converterPackageName = cp; | |
| 162 | + } else { | |
| 163 | + /* Fall back to sun.io */ | |
| 164 | + cp = "sun.io"; | |
| 165 | + } | |
| 166 | + return cp; | |
| 167 | + } | |
| 168 | + | |
| 169 | + public static String getDefaultEncodingName() { | |
| 170 | + synchronized (lock) { | |
| 171 | + if (defaultEncoding == null) { | |
| 172 | + java.security.PrivilegedAction<String> pa = | |
| 173 | + new sun.security.action.GetPropertyAction("file.encoding"); | |
| 174 | + defaultEncoding = java.security.AccessController.doPrivileged(pa); | |
| 175 | + } | |
| 176 | + } | |
| 177 | + return defaultEncoding; | |
| 178 | + } | |
| 179 | + | |
| 180 | + public static void resetDefaultEncodingName() { | |
| 181 | + // This method should only be called during VM initialization. | |
| 182 | + if (sun.misc.VM.isBooted()) | |
| 183 | + return; | |
| 184 | + | |
| 185 | + synchronized (lock) { | |
| 186 | + defaultEncoding = "ISO-8859-1"; | |
| 187 | + Properties p = System.getProperties(); | |
| 188 | + p.setProperty("file.encoding", defaultEncoding); | |
| 189 | + System.setProperties(p); | |
| 190 | + } | |
| 191 | + } | |
| 192 | + | |
| 193 | + /** | |
| 194 | + * Get the class that implements the given type of converter for the named | |
| 195 | + * encoding, or throw an UnsupportedEncodingException if no such class can | |
| 196 | + * be found | |
| 197 | + */ | |
| 198 | + private static Class<?> getConverterClass(int type, String encoding) | |
| 199 | + throws UnsupportedEncodingException | |
| 200 | + { | |
| 201 | + String enc = null; | |
| 202 | + | |
| 203 | + /* "ISO8859_1" is the canonical name for the ISO-Latin-1 encoding. | |
| 204 | + Native code in the JDK commonly uses the alias "8859_1" instead of | |
| 205 | + "ISO8859_1". We hardwire this alias here in order to avoid loading | |
| 206 | + the full alias table just for this case. */ | |
| 207 | + if (!encoding.equals("ISO8859_1")) { | |
| 208 | + if (encoding.equals("8859_1")) { | |
| 209 | + enc = "ISO8859_1"; | |
| 210 | + /* | |
| 211 | + * On Solaris with nl_langinfo() called in GetJavaProperties(): | |
| 212 | + * | |
| 213 | + * locale undefined -> NULL -> hardcoded default | |
| 214 | + * "C" locale -> "" -> hardcoded default (on 2.6) | |
| 215 | + * "C" locale -> "646" (on 2.7) | |
| 216 | + * "en_US" locale -> "ISO8859-1" | |
| 217 | + * "en_GB" locale -> "ISO8859-1" (on 2.7) | |
| 218 | + * "en_UK" locale -> "ISO8859-1" (on 2.6) | |
| 219 | + */ | |
| 220 | + } else if (encoding.equals("ISO8859-1")) { | |
| 221 | + enc = "ISO8859_1"; | |
| 222 | + } else if (encoding.equals("646")) { | |
| 223 | + enc = "ASCII"; | |
| 224 | + } else { | |
| 225 | + enc = CharacterEncoding.aliasName(encoding); | |
| 226 | + } | |
| 227 | + } | |
| 228 | + if (enc == null) { | |
| 229 | + enc = encoding; | |
| 230 | + } | |
| 231 | + | |
| 232 | + try { | |
| 233 | + return Class.forName(getConverterPackageName() | |
| 234 | + + "." + converterPrefix[type] + enc); | |
| 235 | + } catch(ClassNotFoundException e) { | |
| 236 | + throw new UnsupportedEncodingException(enc); | |
| 237 | + } | |
| 238 | + | |
| 239 | + } | |
| 240 | + | |
| 241 | + /** | |
| 242 | + * Instantiate the given converter class, or throw an | |
| 243 | + * UnsupportedEncodingException if it cannot be instantiated | |
| 244 | + */ | |
| 245 | + private static Object newConverter(String enc, Class<?> c) | |
| 246 | + throws UnsupportedEncodingException | |
| 247 | + { | |
| 248 | + try { | |
| 249 | + return c.newInstance(); | |
| 250 | + } catch(InstantiationException e) { | |
| 251 | + throw new UnsupportedEncodingException(enc); | |
| 252 | + } catch(IllegalAccessException e) { | |
| 253 | + throw new UnsupportedEncodingException(enc); | |
| 254 | + } | |
| 255 | + } | |
| 256 | + | |
| 257 | + /** | |
| 258 | + * Create a converter object that implements the given type of converter | |
| 259 | + * for the given encoding, or throw an UnsupportedEncodingException if no | |
| 260 | + * appropriate converter class can be found and instantiated | |
| 261 | + */ | |
| 262 | + static Object newConverter(int type, String enc) | |
| 263 | + throws UnsupportedEncodingException | |
| 264 | + { | |
| 265 | + Class<?> c; | |
| 266 | + synchronized (lock) { | |
| 267 | + c = cache(type, enc); | |
| 268 | + if (c == null) { | |
| 269 | + c = getConverterClass(type, enc); | |
| 270 | + if (!c.getName().equals("sun.io.CharToByteUTF8")) | |
| 271 | + cache(type, enc, c); | |
| 272 | + } | |
| 273 | + } | |
| 274 | + return newConverter(enc, c); | |
| 275 | + } | |
| 276 | + | |
| 277 | + /** | |
| 278 | + * Find the class that implements the given type of converter for the | |
| 279 | + * default encoding. If the default encoding cannot be determined or is | |
| 280 | + * not yet defined, return a class that implements the fallback default | |
| 281 | + * encoding, which is just ISO 8859-1. | |
| 282 | + */ | |
| 283 | + private static Class<?> getDefaultConverterClass(int type) { | |
| 284 | + boolean fillCache = false; | |
| 285 | + Class<?> c; | |
| 286 | + | |
| 287 | + /* First check the class cache */ | |
| 288 | + c = cache(type, DEFAULT_NAME); | |
| 289 | + if (c != null) | |
| 290 | + return c; | |
| 291 | + | |
| 292 | + /* Determine the encoding name */ | |
| 293 | + String enc = getDefaultEncodingName(); | |
| 294 | + if (enc != null) { | |
| 295 | + /* file.encoding has been set, so cache the converter class */ | |
| 296 | + fillCache = true; | |
| 297 | + } else { | |
| 298 | + /* file.encoding has not been set, so use a default encoding which | |
| 299 | + will not be cached */ | |
| 300 | + enc = "ISO8859_1"; | |
| 301 | + } | |
| 302 | + | |
| 303 | + /* We have an encoding name; try to find its class */ | |
| 304 | + try { | |
| 305 | + c = getConverterClass(type, enc); | |
| 306 | + if (fillCache) { | |
| 307 | + cache(type, DEFAULT_NAME, c); | |
| 308 | + } | |
| 309 | + } catch (UnsupportedEncodingException x) { | |
| 310 | + /* Can't find the default class, so fall back to ISO 8859-1 */ | |
| 311 | + try { | |
| 312 | + c = getConverterClass(type, "ISO8859_1"); | |
| 313 | + } catch (UnsupportedEncodingException y) { | |
| 314 | + throw new InternalError("Cannot find default " | |
| 315 | + + converterPrefix[type] | |
| 316 | + + " converter class"); | |
| 317 | + } | |
| 318 | + } | |
| 319 | + return c; | |
| 320 | + | |
| 321 | + } | |
| 322 | + | |
| 323 | + /** | |
| 324 | + * Create a converter object that implements the given type of converter | |
| 325 | + * for the default encoding, falling back to ISO 8859-1 if the default | |
| 326 | + * encoding cannot be determined. | |
| 327 | + */ | |
| 328 | + static Object newDefaultConverter(int type) { | |
| 329 | + Class<?> c; | |
| 330 | + synchronized (lock) { | |
| 331 | + c = getDefaultConverterClass(type); | |
| 332 | + } | |
| 333 | + try { | |
| 334 | + return newConverter("", c); | |
| 335 | + } catch (UnsupportedEncodingException x) { | |
| 336 | + throw new InternalError("Cannot instantiate default converter" | |
| 337 | + + " class " + c.getName()); | |
| 338 | + } | |
| 339 | + } | |
| 340 | + | |
| 341 | +} | |