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| 1 | +/* | |
| 2 | + * Copyright (c) 1996, 2011, 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 - All Rights Reserved | |
| 28 | + * (C) Copyright IBM Corp. 1996 - All Rights Reserved | |
| 29 | + * | |
| 30 | + * The original version of this source code and documentation is copyrighted | |
| 31 | + * and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These | |
| 32 | + * materials are provided under terms of a License Agreement between Taligent | |
| 33 | + * and Sun. This technology is protected by multiple US and International | |
| 34 | + * patents. This notice and attribution to Taligent may not be removed. | |
| 35 | + * Taligent is a registered trademark of Taligent, Inc. | |
| 36 | + * | |
| 37 | + */ | |
| 38 | + | |
| 39 | +package java.util; | |
| 40 | + | |
| 41 | +import java.io.Serializable; | |
| 42 | +import java.lang.ref.SoftReference; | |
| 43 | +import java.security.AccessController; | |
| 44 | +import java.security.PrivilegedAction; | |
| 45 | +import java.util.concurrent.ConcurrentHashMap; | |
| 46 | +import sun.security.action.GetPropertyAction; | |
| 47 | +import sun.util.TimeZoneNameUtility; | |
| 48 | +import sun.util.calendar.ZoneInfo; | |
| 49 | +import sun.util.calendar.ZoneInfoFile; | |
| 50 | + | |
| 51 | +/** | |
| 52 | + * <code>TimeZone</code> represents a time zone offset, and also figures out daylight | |
| 53 | + * savings. | |
| 54 | + * | |
| 55 | + * <p> | |
| 56 | + * Typically, you get a <code>TimeZone</code> using <code>getDefault</code> | |
| 57 | + * which creates a <code>TimeZone</code> based on the time zone where the program | |
| 58 | + * is running. For example, for a program running in Japan, <code>getDefault</code> | |
| 59 | + * creates a <code>TimeZone</code> object based on Japanese Standard Time. | |
| 60 | + * | |
| 61 | + * <p> | |
| 62 | + * You can also get a <code>TimeZone</code> using <code>getTimeZone</code> | |
| 63 | + * along with a time zone ID. For instance, the time zone ID for the | |
| 64 | + * U.S. Pacific Time zone is "America/Los_Angeles". So, you can get a | |
| 65 | + * U.S. Pacific Time <code>TimeZone</code> object with: | |
| 66 | + * <blockquote><pre> | |
| 67 | + * TimeZone tz = TimeZone.getTimeZone("America/Los_Angeles"); | |
| 68 | + * </pre></blockquote> | |
| 69 | + * You can use the <code>getAvailableIDs</code> method to iterate through | |
| 70 | + * all the supported time zone IDs. You can then choose a | |
| 71 | + * supported ID to get a <code>TimeZone</code>. | |
| 72 | + * If the time zone you want is not represented by one of the | |
| 73 | + * supported IDs, then a custom time zone ID can be specified to | |
| 74 | + * produce a TimeZone. The syntax of a custom time zone ID is: | |
| 75 | + * | |
| 76 | + * <blockquote><pre> | |
| 77 | + * <a name="CustomID"><i>CustomID:</i></a> | |
| 78 | + * <code>GMT</code> <i>Sign</i> <i>Hours</i> <code>:</code> <i>Minutes</i> | |
| 79 | + * <code>GMT</code> <i>Sign</i> <i>Hours</i> <i>Minutes</i> | |
| 80 | + * <code>GMT</code> <i>Sign</i> <i>Hours</i> | |
| 81 | + * <i>Sign:</i> one of | |
| 82 | + * <code>+ -</code> | |
| 83 | + * <i>Hours:</i> | |
| 84 | + * <i>Digit</i> | |
| 85 | + * <i>Digit</i> <i>Digit</i> | |
| 86 | + * <i>Minutes:</i> | |
| 87 | + * <i>Digit</i> <i>Digit</i> | |
| 88 | + * <i>Digit:</i> one of | |
| 89 | + * <code>0 1 2 3 4 5 6 7 8 9</code> | |
| 90 | + * </pre></blockquote> | |
| 91 | + * | |
| 92 | + * <i>Hours</i> must be between 0 to 23 and <i>Minutes</i> must be | |
| 93 | + * between 00 to 59. For example, "GMT+10" and "GMT+0010" mean ten | |
| 94 | + * hours and ten minutes ahead of GMT, respectively. | |
| 95 | + * <p> | |
| 96 | + * The format is locale independent and digits must be taken from the | |
| 97 | + * Basic Latin block of the Unicode standard. No daylight saving time | |
| 98 | + * transition schedule can be specified with a custom time zone ID. If | |
| 99 | + * the specified string doesn't match the syntax, <code>"GMT"</code> | |
| 100 | + * is used. | |
| 101 | + * <p> | |
| 102 | + * When creating a <code>TimeZone</code>, the specified custom time | |
| 103 | + * zone ID is normalized in the following syntax: | |
| 104 | + * <blockquote><pre> | |
| 105 | + * <a name="NormalizedCustomID"><i>NormalizedCustomID:</i></a> | |
| 106 | + * <code>GMT</code> <i>Sign</i> <i>TwoDigitHours</i> <code>:</code> <i>Minutes</i> | |
| 107 | + * <i>Sign:</i> one of | |
| 108 | + * <code>+ -</code> | |
| 109 | + * <i>TwoDigitHours:</i> | |
| 110 | + * <i>Digit</i> <i>Digit</i> | |
| 111 | + * <i>Minutes:</i> | |
| 112 | + * <i>Digit</i> <i>Digit</i> | |
| 113 | + * <i>Digit:</i> one of | |
| 114 | + * <code>0 1 2 3 4 5 6 7 8 9</code> | |
| 115 | + * </pre></blockquote> | |
| 116 | + * For example, TimeZone.getTimeZone("GMT-8").getID() returns "GMT-08:00". | |
| 117 | + * | |
| 118 | + * <h4>Three-letter time zone IDs</h4> | |
| 119 | + * | |
| 120 | + * For compatibility with JDK 1.1.x, some other three-letter time zone IDs | |
| 121 | + * (such as "PST", "CTT", "AST") are also supported. However, <strong>their | |
| 122 | + * use is deprecated</strong> because the same abbreviation is often used | |
| 123 | + * for multiple time zones (for example, "CST" could be U.S. "Central Standard | |
| 124 | + * Time" and "China Standard Time"), and the Java platform can then only | |
| 125 | + * recognize one of them. | |
| 126 | + * | |
| 127 | + * | |
| 128 | + * @see Calendar | |
| 129 | + * @see GregorianCalendar | |
| 130 | + * @see SimpleTimeZone | |
| 131 | + * @author Mark Davis, David Goldsmith, Chen-Lieh Huang, Alan Liu | |
| 132 | + * @since JDK1.1 | |
| 133 | + */ | |
| 134 | +abstract public class TimeZone implements Serializable, Cloneable { | |
| 135 | + /** | |
| 136 | + * Sole constructor. (For invocation by subclass constructors, typically | |
| 137 | + * implicit.) | |
| 138 | + */ | |
| 139 | + public TimeZone() { | |
| 140 | + } | |
| 141 | + | |
| 142 | + /** | |
| 143 | + * A style specifier for <code>getDisplayName()</code> indicating | |
| 144 | + * a short name, such as "PST." | |
| 145 | + * @see #LONG | |
| 146 | + * @since 1.2 | |
| 147 | + */ | |
| 148 | + public static final int SHORT = 0; | |
| 149 | + | |
| 150 | + /** | |
| 151 | + * A style specifier for <code>getDisplayName()</code> indicating | |
| 152 | + * a long name, such as "Pacific Standard Time." | |
| 153 | + * @see #SHORT | |
| 154 | + * @since 1.2 | |
| 155 | + */ | |
| 156 | + public static final int LONG = 1; | |
| 157 | + | |
| 158 | + // Constants used internally; unit is milliseconds | |
| 159 | + private static final int ONE_MINUTE = 60*1000; | |
| 160 | + private static final int ONE_HOUR = 60*ONE_MINUTE; | |
| 161 | + private static final int ONE_DAY = 24*ONE_HOUR; | |
| 162 | + | |
| 163 | + // Proclaim serialization compatibility with JDK 1.1 | |
| 164 | + static final long serialVersionUID = 3581463369166924961L; | |
| 165 | + | |
| 166 | + /** | |
| 167 | + * Gets the time zone offset, for current date, modified in case of | |
| 168 | + * daylight savings. This is the offset to add to UTC to get local time. | |
| 169 | + * <p> | |
| 170 | + * This method returns a historically correct offset if an | |
| 171 | + * underlying <code>TimeZone</code> implementation subclass | |
| 172 | + * supports historical Daylight Saving Time schedule and GMT | |
| 173 | + * offset changes. | |
| 174 | + * | |
| 175 | + * @param era the era of the given date. | |
| 176 | + * @param year the year in the given date. | |
| 177 | + * @param month the month in the given date. | |
| 178 | + * Month is 0-based. e.g., 0 for January. | |
| 179 | + * @param day the day-in-month of the given date. | |
| 180 | + * @param dayOfWeek the day-of-week of the given date. | |
| 181 | + * @param milliseconds the milliseconds in day in <em>standard</em> | |
| 182 | + * local time. | |
| 183 | + * | |
| 184 | + * @return the offset in milliseconds to add to GMT to get local time. | |
| 185 | + * | |
| 186 | + * @see Calendar#ZONE_OFFSET | |
| 187 | + * @see Calendar#DST_OFFSET | |
| 188 | + */ | |
| 189 | + public abstract int getOffset(int era, int year, int month, int day, | |
| 190 | + int dayOfWeek, int milliseconds); | |
| 191 | + | |
| 192 | + /** | |
| 193 | + * Returns the offset of this time zone from UTC at the specified | |
| 194 | + * date. If Daylight Saving Time is in effect at the specified | |
| 195 | + * date, the offset value is adjusted with the amount of daylight | |
| 196 | + * saving. | |
| 197 | + * <p> | |
| 198 | + * This method returns a historically correct offset value if an | |
| 199 | + * underlying TimeZone implementation subclass supports historical | |
| 200 | + * Daylight Saving Time schedule and GMT offset changes. | |
| 201 | + * | |
| 202 | + * @param date the date represented in milliseconds since January 1, 1970 00:00:00 GMT | |
| 203 | + * @return the amount of time in milliseconds to add to UTC to get local time. | |
| 204 | + * | |
| 205 | + * @see Calendar#ZONE_OFFSET | |
| 206 | + * @see Calendar#DST_OFFSET | |
| 207 | + * @since 1.4 | |
| 208 | + */ | |
| 209 | + public int getOffset(long date) { | |
| 210 | + if (inDaylightTime(new Date(date))) { | |
| 211 | + return getRawOffset() + getDSTSavings(); | |
| 212 | + } | |
| 213 | + return getRawOffset(); | |
| 214 | + } | |
| 215 | + | |
| 216 | + /** | |
| 217 | + * Gets the raw GMT offset and the amount of daylight saving of this | |
| 218 | + * time zone at the given time. | |
| 219 | + * @param date the milliseconds (since January 1, 1970, | |
| 220 | + * 00:00:00.000 GMT) at which the time zone offset and daylight | |
| 221 | + * saving amount are found | |
| 222 | + * @param offset an array of int where the raw GMT offset | |
| 223 | + * (offset[0]) and daylight saving amount (offset[1]) are stored, | |
| 224 | + * or null if those values are not needed. The method assumes that | |
| 225 | + * the length of the given array is two or larger. | |
| 226 | + * @return the total amount of the raw GMT offset and daylight | |
| 227 | + * saving at the specified date. | |
| 228 | + * | |
| 229 | + * @see Calendar#ZONE_OFFSET | |
| 230 | + * @see Calendar#DST_OFFSET | |
| 231 | + */ | |
| 232 | + int getOffsets(long date, int[] offsets) { | |
| 233 | + int rawoffset = getRawOffset(); | |
| 234 | + int dstoffset = 0; | |
| 235 | + if (inDaylightTime(new Date(date))) { | |
| 236 | + dstoffset = getDSTSavings(); | |
| 237 | + } | |
| 238 | + if (offsets != null) { | |
| 239 | + offsets[0] = rawoffset; | |
| 240 | + offsets[1] = dstoffset; | |
| 241 | + } | |
| 242 | + return rawoffset + dstoffset; | |
| 243 | + } | |
| 244 | + | |
| 245 | + /** | |
| 246 | + * Sets the base time zone offset to GMT. | |
| 247 | + * This is the offset to add to UTC to get local time. | |
| 248 | + * <p> | |
| 249 | + * If an underlying <code>TimeZone</code> implementation subclass | |
| 250 | + * supports historical GMT offset changes, the specified GMT | |
| 251 | + * offset is set as the latest GMT offset and the difference from | |
| 252 | + * the known latest GMT offset value is used to adjust all | |
| 253 | + * historical GMT offset values. | |
| 254 | + * | |
| 255 | + * @param offsetMillis the given base time zone offset to GMT. | |
| 256 | + */ | |
| 257 | + abstract public void setRawOffset(int offsetMillis); | |
| 258 | + | |
| 259 | + /** | |
| 260 | + * Returns the amount of time in milliseconds to add to UTC to get | |
| 261 | + * standard time in this time zone. Because this value is not | |
| 262 | + * affected by daylight saving time, it is called <I>raw | |
| 263 | + * offset</I>. | |
| 264 | + * <p> | |
| 265 | + * If an underlying <code>TimeZone</code> implementation subclass | |
| 266 | + * supports historical GMT offset changes, the method returns the | |
| 267 | + * raw offset value of the current date. In Honolulu, for example, | |
| 268 | + * its raw offset changed from GMT-10:30 to GMT-10:00 in 1947, and | |
| 269 | + * this method always returns -36000000 milliseconds (i.e., -10 | |
| 270 | + * hours). | |
| 271 | + * | |
| 272 | + * @return the amount of raw offset time in milliseconds to add to UTC. | |
| 273 | + * @see Calendar#ZONE_OFFSET | |
| 274 | + */ | |
| 275 | + public abstract int getRawOffset(); | |
| 276 | + | |
| 277 | + /** | |
| 278 | + * Gets the ID of this time zone. | |
| 279 | + * @return the ID of this time zone. | |
| 280 | + */ | |
| 281 | + public String getID() | |
| 282 | + { | |
| 283 | + return ID; | |
| 284 | + } | |
| 285 | + | |
| 286 | + /** | |
| 287 | + * Sets the time zone ID. This does not change any other data in | |
| 288 | + * the time zone object. | |
| 289 | + * @param ID the new time zone ID. | |
| 290 | + */ | |
| 291 | + public void setID(String ID) | |
| 292 | + { | |
| 293 | + if (ID == null) { | |
| 294 | + throw new NullPointerException(); | |
| 295 | + } | |
| 296 | + this.ID = ID; | |
| 297 | + } | |
| 298 | + | |
| 299 | + /** | |
| 300 | + * Returns a long standard time name of this {@code TimeZone} suitable for | |
| 301 | + * presentation to the user in the default locale. | |
| 302 | + * | |
| 303 | + * <p>This method is equivalent to: | |
| 304 | + * <pre><blockquote> | |
| 305 | + * getDisplayName(false, {@link #LONG}, | |
| 306 | + * Locale.getDefault({@link Locale.Category#DISPLAY})) | |
| 307 | + * </blockquote></pre> | |
| 308 | + * | |
| 309 | + * @return the human-readable name of this time zone in the default locale. | |
| 310 | + * @since 1.2 | |
| 311 | + * @see #getDisplayName(boolean, int, Locale) | |
| 312 | + * @see Locale#getDefault(Locale.Category) | |
| 313 | + * @see Locale.Category | |
| 314 | + */ | |
| 315 | + public final String getDisplayName() { | |
| 316 | + return getDisplayName(false, LONG, | |
| 317 | + Locale.getDefault(Locale.Category.DISPLAY)); | |
| 318 | + } | |
| 319 | + | |
| 320 | + /** | |
| 321 | + * Returns a long standard time name of this {@code TimeZone} suitable for | |
| 322 | + * presentation to the user in the specified {@code locale}. | |
| 323 | + * | |
| 324 | + * <p>This method is equivalent to: | |
| 325 | + * <pre><blockquote> | |
| 326 | + * getDisplayName(false, {@link #LONG}, locale) | |
| 327 | + * </blockquote></pre> | |
| 328 | + * | |
| 329 | + * @param locale the locale in which to supply the display name. | |
| 330 | + * @return the human-readable name of this time zone in the given locale. | |
| 331 | + * @exception NullPointerException if {@code locale} is {@code null}. | |
| 332 | + * @since 1.2 | |
| 333 | + * @see #getDisplayName(boolean, int, Locale) | |
| 334 | + */ | |
| 335 | + public final String getDisplayName(Locale locale) { | |
| 336 | + return getDisplayName(false, LONG, locale); | |
| 337 | + } | |
| 338 | + | |
| 339 | + /** | |
| 340 | + * Returns a name in the specified {@code style} of this {@code TimeZone} | |
| 341 | + * suitable for presentation to the user in the default locale. If the | |
| 342 | + * specified {@code daylight} is {@code true}, a Daylight Saving Time name | |
| 343 | + * is returned (even if this {@code TimeZone} doesn't observe Daylight Saving | |
| 344 | + * Time). Otherwise, a Standard Time name is returned. | |
| 345 | + * | |
| 346 | + * <p>This method is equivalent to: | |
| 347 | + * <pre><blockquote> | |
| 348 | + * getDisplayName(daylight, style, | |
| 349 | + * Locale.getDefault({@link Locale.Category#DISPLAY})) | |
| 350 | + * </blockquote></pre> | |
| 351 | + * | |
| 352 | + * @param daylight {@code true} specifying a Daylight Saving Time name, or | |
| 353 | + * {@code false} specifying a Standard Time name | |
| 354 | + * @param style either {@link #LONG} or {@link #SHORT} | |
| 355 | + * @return the human-readable name of this time zone in the default locale. | |
| 356 | + * @exception IllegalArgumentException if {@code style} is invalid. | |
| 357 | + * @since 1.2 | |
| 358 | + * @see #getDisplayName(boolean, int, Locale) | |
| 359 | + * @see Locale#getDefault(Locale.Category) | |
| 360 | + * @see Locale.Category | |
| 361 | + * @see java.text.DateFormatSymbols#getZoneStrings() | |
| 362 | + */ | |
| 363 | + public final String getDisplayName(boolean daylight, int style) { | |
| 364 | + return getDisplayName(daylight, style, | |
| 365 | + Locale.getDefault(Locale.Category.DISPLAY)); | |
| 366 | + } | |
| 367 | + | |
| 368 | + /** | |
| 369 | + * Returns a name in the specified {@code style} of this {@code TimeZone} | |
| 370 | + * suitable for presentation to the user in the specified {@code | |
| 371 | + * locale}. If the specified {@code daylight} is {@code true}, a Daylight | |
| 372 | + * Saving Time name is returned (even if this {@code TimeZone} doesn't | |
| 373 | + * observe Daylight Saving Time). Otherwise, a Standard Time name is | |
| 374 | + * returned. | |
| 375 | + * | |
| 376 | + * <p>When looking up a time zone name, the {@linkplain | |
| 377 | + * ResourceBundle.Control#getCandidateLocales(String,Locale) default | |
| 378 | + * <code>Locale</code> search path of <code>ResourceBundle</code>} derived | |
| 379 | + * from the specified {@code locale} is used. (No {@linkplain | |
| 380 | + * ResourceBundle.Control#getFallbackLocale(String,Locale) fallback | |
| 381 | + * <code>Locale</code>} search is performed.) If a time zone name in any | |
| 382 | + * {@code Locale} of the search path, including {@link Locale#ROOT}, is | |
| 383 | + * found, the name is returned. Otherwise, a string in the | |
| 384 | + * <a href="#NormalizedCustomID">normalized custom ID format</a> is returned. | |
| 385 | + * | |
| 386 | + * @param daylight {@code true} specifying a Daylight Saving Time name, or | |
| 387 | + * {@code false} specifying a Standard Time name | |
| 388 | + * @param style either {@link #LONG} or {@link #SHORT} | |
| 389 | + * @param locale the locale in which to supply the display name. | |
| 390 | + * @return the human-readable name of this time zone in the given locale. | |
| 391 | + * @exception IllegalArgumentException if {@code style} is invalid. | |
| 392 | + * @exception NullPointerException if {@code locale} is {@code null}. | |
| 393 | + * @since 1.2 | |
| 394 | + * @see java.text.DateFormatSymbols#getZoneStrings() | |
| 395 | + */ | |
| 396 | + public String getDisplayName(boolean daylight, int style, Locale locale) { | |
| 397 | + if (style != SHORT && style != LONG) { | |
| 398 | + throw new IllegalArgumentException("Illegal style: " + style); | |
| 399 | + } | |
| 400 | + | |
| 401 | + String id = getID(); | |
| 402 | + String[] names = getDisplayNames(id, locale); | |
| 403 | + if (names == null) { | |
| 404 | + if (id.startsWith("GMT")) { | |
| 405 | + char sign = id.charAt(3); | |
| 406 | + if (sign == '+' || sign == '-') { | |
| 407 | + return id; | |
| 408 | + } | |
| 409 | + } | |
| 410 | + int offset = getRawOffset(); | |
| 411 | + if (daylight) { | |
| 412 | + offset += getDSTSavings(); | |
| 413 | + } | |
| 414 | + return ZoneInfoFile.toCustomID(offset); | |
| 415 | + } | |
| 416 | + | |
| 417 | + int index = daylight ? 3 : 1; | |
| 418 | + if (style == SHORT) { | |
| 419 | + index++; | |
| 420 | + } | |
| 421 | + return names[index]; | |
| 422 | + } | |
| 423 | + | |
| 424 | + private static class DisplayNames { | |
| 425 | + // Cache for managing display names per timezone per locale | |
| 426 | + // The structure is: | |
| 427 | + // Map(key=id, value=SoftReference(Map(key=locale, value=displaynames))) | |
| 428 | + private static final Map<String, SoftReference<Map<Locale, String[]>>> CACHE = | |
| 429 | + new ConcurrentHashMap<String, SoftReference<Map<Locale, String[]>>>(); | |
| 430 | + } | |
| 431 | + | |
| 432 | + private static final String[] getDisplayNames(String id, Locale locale) { | |
| 433 | + Map<String, SoftReference<Map<Locale, String[]>>> displayNames = DisplayNames.CACHE; | |
| 434 | + | |
| 435 | + SoftReference<Map<Locale, String[]>> ref = displayNames.get(id); | |
| 436 | + if (ref != null) { | |
| 437 | + Map<Locale, String[]> perLocale = ref.get(); | |
| 438 | + if (perLocale != null) { | |
| 439 | + String[] names = perLocale.get(locale); | |
| 440 | + if (names != null) { | |
| 441 | + return names; | |
| 442 | + } | |
| 443 | + names = TimeZoneNameUtility.retrieveDisplayNames(id, locale); | |
| 444 | + if (names != null) { | |
| 445 | + perLocale.put(locale, names); | |
| 446 | + } | |
| 447 | + return names; | |
| 448 | + } | |
| 449 | + } | |
| 450 | + | |
| 451 | + String[] names = TimeZoneNameUtility.retrieveDisplayNames(id, locale); | |
| 452 | + if (names != null) { | |
| 453 | + Map<Locale, String[]> perLocale = new ConcurrentHashMap<Locale, String[]>(); | |
| 454 | + perLocale.put(locale, names); | |
| 455 | + ref = new SoftReference<Map<Locale, String[]>>(perLocale); | |
| 456 | + displayNames.put(id, ref); | |
| 457 | + } | |
| 458 | + return names; | |
| 459 | + } | |
| 460 | + | |
| 461 | + /** | |
| 462 | + * Returns the amount of time to be added to local standard time | |
| 463 | + * to get local wall clock time. | |
| 464 | + * | |
| 465 | + * <p>The default implementation returns 3600000 milliseconds | |
| 466 | + * (i.e., one hour) if a call to {@link #useDaylightTime()} | |
| 467 | + * returns {@code true}. Otherwise, 0 (zero) is returned. | |
| 468 | + * | |
| 469 | + * <p>If an underlying {@code TimeZone} implementation subclass | |
| 470 | + * supports historical and future Daylight Saving Time schedule | |
| 471 | + * changes, this method returns the amount of saving time of the | |
| 472 | + * last known Daylight Saving Time rule that can be a future | |
| 473 | + * prediction. | |
| 474 | + * | |
| 475 | + * <p>If the amount of saving time at any given time stamp is | |
| 476 | + * required, construct a {@link Calendar} with this {@code | |
| 477 | + * TimeZone} and the time stamp, and call {@link Calendar#get(int) | |
| 478 | + * Calendar.get}{@code (}{@link Calendar#DST_OFFSET}{@code )}. | |
| 479 | + * | |
| 480 | + * @return the amount of saving time in milliseconds | |
| 481 | + * @since 1.4 | |
| 482 | + * @see #inDaylightTime(Date) | |
| 483 | + * @see #getOffset(long) | |
| 484 | + * @see #getOffset(int,int,int,int,int,int) | |
| 485 | + * @see Calendar#ZONE_OFFSET | |
| 486 | + */ | |
| 487 | + public int getDSTSavings() { | |
| 488 | + if (useDaylightTime()) { | |
| 489 | + return 3600000; | |
| 490 | + } | |
| 491 | + return 0; | |
| 492 | + } | |
| 493 | + | |
| 494 | + /** | |
| 495 | + * Queries if this {@code TimeZone} uses Daylight Saving Time. | |
| 496 | + * | |
| 497 | + * <p>If an underlying {@code TimeZone} implementation subclass | |
| 498 | + * supports historical and future Daylight Saving Time schedule | |
| 499 | + * changes, this method refers to the last known Daylight Saving Time | |
| 500 | + * rule that can be a future prediction and may not be the same as | |
| 501 | + * the current rule. Consider calling {@link #observesDaylightTime()} | |
| 502 | + * if the current rule should also be taken into account. | |
| 503 | + * | |
| 504 | + * @return {@code true} if this {@code TimeZone} uses Daylight Saving Time, | |
| 505 | + * {@code false}, otherwise. | |
| 506 | + * @see #inDaylightTime(Date) | |
| 507 | + * @see Calendar#DST_OFFSET | |
| 508 | + */ | |
| 509 | + public abstract boolean useDaylightTime(); | |
| 510 | + | |
| 511 | + /** | |
| 512 | + * Returns {@code true} if this {@code TimeZone} is currently in | |
| 513 | + * Daylight Saving Time, or if a transition from Standard Time to | |
| 514 | + * Daylight Saving Time occurs at any future time. | |
| 515 | + * | |
| 516 | + * <p>The default implementation returns {@code true} if | |
| 517 | + * {@code useDaylightTime()} or {@code inDaylightTime(new Date())} | |
| 518 | + * returns {@code true}. | |
| 519 | + * | |
| 520 | + * @return {@code true} if this {@code TimeZone} is currently in | |
| 521 | + * Daylight Saving Time, or if a transition from Standard Time to | |
| 522 | + * Daylight Saving Time occurs at any future time; {@code false} | |
| 523 | + * otherwise. | |
| 524 | + * @since 1.7 | |
| 525 | + * @see #useDaylightTime() | |
| 526 | + * @see #inDaylightTime(Date) | |
| 527 | + * @see Calendar#DST_OFFSET | |
| 528 | + */ | |
| 529 | + public boolean observesDaylightTime() { | |
| 530 | + return useDaylightTime() || inDaylightTime(new Date()); | |
| 531 | + } | |
| 532 | + | |
| 533 | + /** | |
| 534 | + * Queries if the given {@code date} is in Daylight Saving Time in | |
| 535 | + * this time zone. | |
| 536 | + * | |
| 537 | + * @param date the given Date. | |
| 538 | + * @return {@code true} if the given date is in Daylight Saving Time, | |
| 539 | + * {@code false}, otherwise. | |
| 540 | + */ | |
| 541 | + abstract public boolean inDaylightTime(Date date); | |
| 542 | + | |
| 543 | + /** | |
| 544 | + * Gets the <code>TimeZone</code> for the given ID. | |
| 545 | + * | |
| 546 | + * @param ID the ID for a <code>TimeZone</code>, either an abbreviation | |
| 547 | + * such as "PST", a full name such as "America/Los_Angeles", or a custom | |
| 548 | + * ID such as "GMT-8:00". Note that the support of abbreviations is | |
| 549 | + * for JDK 1.1.x compatibility only and full names should be used. | |
| 550 | + * | |
| 551 | + * @return the specified <code>TimeZone</code>, or the GMT zone if the given ID | |
| 552 | + * cannot be understood. | |
| 553 | + */ | |
| 554 | + public static synchronized TimeZone getTimeZone(String ID) { | |
| 555 | + return getTimeZone(ID, true); | |
| 556 | + } | |
| 557 | + | |
| 558 | + private static TimeZone getTimeZone(String ID, boolean fallback) { | |
| 559 | + TimeZone tz = ZoneInfo.getTimeZone(ID); | |
| 560 | + if (tz == null) { | |
| 561 | + tz = parseCustomTimeZone(ID); | |
| 562 | + if (tz == null && fallback) { | |
| 563 | + tz = new ZoneInfo(GMT_ID, 0); | |
| 564 | + } | |
| 565 | + } | |
| 566 | + return tz; | |
| 567 | + } | |
| 568 | + | |
| 569 | + /** | |
| 570 | + * Gets the available IDs according to the given time zone offset in milliseconds. | |
| 571 | + * | |
| 572 | + * @param rawOffset the given time zone GMT offset in milliseconds. | |
| 573 | + * @return an array of IDs, where the time zone for that ID has | |
| 574 | + * the specified GMT offset. For example, "America/Phoenix" and "America/Denver" | |
| 575 | + * both have GMT-07:00, but differ in daylight saving behavior. | |
| 576 | + * @see #getRawOffset() | |
| 577 | + */ | |
| 578 | + public static synchronized String[] getAvailableIDs(int rawOffset) { | |
| 579 | + return ZoneInfo.getAvailableIDs(rawOffset); | |
| 580 | + } | |
| 581 | + | |
| 582 | + /** | |
| 583 | + * Gets all the available IDs supported. | |
| 584 | + * @return an array of IDs. | |
| 585 | + */ | |
| 586 | + public static synchronized String[] getAvailableIDs() { | |
| 587 | + return ZoneInfo.getAvailableIDs(); | |
| 588 | + } | |
| 589 | + | |
| 590 | + /** | |
| 591 | + * Gets the platform defined TimeZone ID. | |
| 592 | + **/ | |
| 593 | + private static native String getSystemTimeZoneID(String javaHome, | |
| 594 | + String country); | |
| 595 | + | |
| 596 | + /** | |
| 597 | + * Gets the custom time zone ID based on the GMT offset of the | |
| 598 | + * platform. (e.g., "GMT+08:00") | |
| 599 | + */ | |
| 600 | + private static native String getSystemGMTOffsetID(); | |
| 601 | + | |
| 602 | + /** | |
| 603 | + * Gets the default <code>TimeZone</code> for this host. | |
| 604 | + * The source of the default <code>TimeZone</code> | |
| 605 | + * may vary with implementation. | |
| 606 | + * @return a default <code>TimeZone</code>. | |
| 607 | + * @see #setDefault | |
| 608 | + */ | |
| 609 | + public static TimeZone getDefault() { | |
| 610 | + return (TimeZone) getDefaultRef().clone(); | |
| 611 | + } | |
| 612 | + | |
| 613 | + /** | |
| 614 | + * Returns the reference to the default TimeZone object. This | |
| 615 | + * method doesn't create a clone. | |
| 616 | + */ | |
| 617 | + static TimeZone getDefaultRef() { | |
| 618 | + TimeZone defaultZone = defaultZoneTL.get(); | |
| 619 | + if (defaultZone == null) { | |
| 620 | + defaultZone = defaultTimeZone; | |
| 621 | + if (defaultZone == null) { | |
| 622 | + // Need to initialize the default time zone. | |
| 623 | + defaultZone = setDefaultZone(); | |
| 624 | + assert defaultZone != null; | |
| 625 | + } | |
| 626 | + } | |
| 627 | + // Don't clone here. | |
| 628 | + return defaultZone; | |
| 629 | + } | |
| 630 | + | |
| 631 | + private static synchronized TimeZone setDefaultZone() { | |
| 632 | + TimeZone tz = null; | |
| 633 | + // get the time zone ID from the system properties | |
| 634 | + String zoneID = AccessController.doPrivileged( | |
| 635 | + new GetPropertyAction("user.timezone")); | |
| 636 | + | |
| 637 | + // if the time zone ID is not set (yet), perform the | |
| 638 | + // platform to Java time zone ID mapping. | |
| 639 | + if (zoneID == null || zoneID.equals("")) { | |
| 640 | + String country = AccessController.doPrivileged( | |
| 641 | + new GetPropertyAction("user.country")); | |
| 642 | + String javaHome = AccessController.doPrivileged( | |
| 643 | + new GetPropertyAction("java.home")); | |
| 644 | + try { | |
| 645 | + zoneID = getSystemTimeZoneID(javaHome, country); | |
| 646 | + if (zoneID == null) { | |
| 647 | + zoneID = GMT_ID; | |
| 648 | + } | |
| 649 | + } catch (NullPointerException e) { | |
| 650 | + zoneID = GMT_ID; | |
| 651 | + } | |
| 652 | + } | |
| 653 | + | |
| 654 | + // Get the time zone for zoneID. But not fall back to | |
| 655 | + // "GMT" here. | |
| 656 | + tz = getTimeZone(zoneID, false); | |
| 657 | + | |
| 658 | + if (tz == null) { | |
| 659 | + // If the given zone ID is unknown in Java, try to | |
| 660 | + // get the GMT-offset-based time zone ID, | |
| 661 | + // a.k.a. custom time zone ID (e.g., "GMT-08:00"). | |
| 662 | + String gmtOffsetID = getSystemGMTOffsetID(); | |
| 663 | + if (gmtOffsetID != null) { | |
| 664 | + zoneID = gmtOffsetID; | |
| 665 | + } | |
| 666 | + tz = getTimeZone(zoneID, true); | |
| 667 | + } | |
| 668 | + assert tz != null; | |
| 669 | + | |
| 670 | + final String id = zoneID; | |
| 671 | + AccessController.doPrivileged(new PrivilegedAction<Object>() { | |
| 672 | + public Object run() { | |
| 673 | + System.setProperty("user.timezone", id); | |
| 674 | + return null; | |
| 675 | + } | |
| 676 | + }); | |
| 677 | + | |
| 678 | + defaultTimeZone = tz; | |
| 679 | + return tz; | |
| 680 | + } | |
| 681 | + | |
| 682 | + private static boolean hasPermission() { | |
| 683 | + boolean hasPermission = true; | |
| 684 | + SecurityManager sm = System.getSecurityManager(); | |
| 685 | + if (sm != null) { | |
| 686 | + try { | |
| 687 | + sm.checkPermission(new PropertyPermission | |
| 688 | + ("user.timezone", "write")); | |
| 689 | + } catch (SecurityException e) { | |
| 690 | + hasPermission = false; | |
| 691 | + } | |
| 692 | + } | |
| 693 | + return hasPermission; | |
| 694 | + } | |
| 695 | + | |
| 696 | + /** | |
| 697 | + * Sets the <code>TimeZone</code> that is | |
| 698 | + * returned by the <code>getDefault</code> method. If <code>zone</code> | |
| 699 | + * is null, reset the default to the value it had originally when the | |
| 700 | + * VM first started. | |
| 701 | + * @param zone the new default time zone | |
| 702 | + * @see #getDefault | |
| 703 | + */ | |
| 704 | + public static void setDefault(TimeZone zone) | |
| 705 | + { | |
| 706 | + if (hasPermission()) { | |
| 707 | + synchronized (TimeZone.class) { | |
| 708 | + defaultTimeZone = zone; | |
| 709 | + defaultZoneTL.set(null); | |
| 710 | + } | |
| 711 | + } else { | |
| 712 | + defaultZoneTL.set(zone); | |
| 713 | + } | |
| 714 | + } | |
| 715 | + | |
| 716 | + /** | |
| 717 | + * Returns true if this zone has the same rule and offset as another zone. | |
| 718 | + * That is, if this zone differs only in ID, if at all. Returns false | |
| 719 | + * if the other zone is null. | |
| 720 | + * @param other the <code>TimeZone</code> object to be compared with | |
| 721 | + * @return true if the other zone is not null and is the same as this one, | |
| 722 | + * with the possible exception of the ID | |
| 723 | + * @since 1.2 | |
| 724 | + */ | |
| 725 | + public boolean hasSameRules(TimeZone other) { | |
| 726 | + return other != null && getRawOffset() == other.getRawOffset() && | |
| 727 | + useDaylightTime() == other.useDaylightTime(); | |
| 728 | + } | |
| 729 | + | |
| 730 | + /** | |
| 731 | + * Creates a copy of this <code>TimeZone</code>. | |
| 732 | + * | |
| 733 | + * @return a clone of this <code>TimeZone</code> | |
| 734 | + */ | |
| 735 | + public Object clone() | |
| 736 | + { | |
| 737 | + try { | |
| 738 | + TimeZone other = (TimeZone) super.clone(); | |
| 739 | + other.ID = ID; | |
| 740 | + return other; | |
| 741 | + } catch (CloneNotSupportedException e) { | |
| 742 | + throw new InternalError(); | |
| 743 | + } | |
| 744 | + } | |
| 745 | + | |
| 746 | + /** | |
| 747 | + * The null constant as a TimeZone. | |
| 748 | + */ | |
| 749 | + static final TimeZone NO_TIMEZONE = null; | |
| 750 | + | |
| 751 | + // =======================privates=============================== | |
| 752 | + | |
| 753 | + /** | |
| 754 | + * The string identifier of this <code>TimeZone</code>. This is a | |
| 755 | + * programmatic identifier used internally to look up <code>TimeZone</code> | |
| 756 | + * objects from the system table and also to map them to their localized | |
| 757 | + * display names. <code>ID</code> values are unique in the system | |
| 758 | + * table but may not be for dynamically created zones. | |
| 759 | + * @serial | |
| 760 | + */ | |
| 761 | + private String ID; | |
| 762 | + private static volatile TimeZone defaultTimeZone; | |
| 763 | + private static final InheritableThreadLocal<TimeZone> defaultZoneTL | |
| 764 | + = new InheritableThreadLocal<TimeZone>(); | |
| 765 | + | |
| 766 | + static final String GMT_ID = "GMT"; | |
| 767 | + private static final int GMT_ID_LENGTH = 3; | |
| 768 | + | |
| 769 | + /** | |
| 770 | + * Parses a custom time zone identifier and returns a corresponding zone. | |
| 771 | + * This method doesn't support the RFC 822 time zone format. (e.g., +hhmm) | |
| 772 | + * | |
| 773 | + * @param id a string of the <a href="#CustomID">custom ID form</a>. | |
| 774 | + * @return a newly created TimeZone with the given offset and | |
| 775 | + * no daylight saving time, or null if the id cannot be parsed. | |
| 776 | + */ | |
| 777 | + private static final TimeZone parseCustomTimeZone(String id) { | |
| 778 | + int length; | |
| 779 | + | |
| 780 | + // Error if the length of id isn't long enough or id doesn't | |
| 781 | + // start with "GMT". | |
| 782 | + if ((length = id.length()) < (GMT_ID_LENGTH + 2) || | |
| 783 | + id.indexOf(GMT_ID) != 0) { | |
| 784 | + return null; | |
| 785 | + } | |
| 786 | + | |
| 787 | + ZoneInfo zi; | |
| 788 | + | |
| 789 | + // First, we try to find it in the cache with the given | |
| 790 | + // id. Even the id is not normalized, the returned ZoneInfo | |
| 791 | + // should have its normalized id. | |
| 792 | + zi = ZoneInfoFile.getZoneInfo(id); | |
| 793 | + if (zi != null) { | |
| 794 | + return zi; | |
| 795 | + } | |
| 796 | + | |
| 797 | + int index = GMT_ID_LENGTH; | |
| 798 | + boolean negative = false; | |
| 799 | + char c = id.charAt(index++); | |
| 800 | + if (c == '-') { | |
| 801 | + negative = true; | |
| 802 | + } else if (c != '+') { | |
| 803 | + return null; | |
| 804 | + } | |
| 805 | + | |
| 806 | + int hours = 0; | |
| 807 | + int num = 0; | |
| 808 | + int countDelim = 0; | |
| 809 | + int len = 0; | |
| 810 | + while (index < length) { | |
| 811 | + c = id.charAt(index++); | |
| 812 | + if (c == ':') { | |
| 813 | + if (countDelim > 0) { | |
| 814 | + return null; | |
| 815 | + } | |
| 816 | + if (len > 2) { | |
| 817 | + return null; | |
| 818 | + } | |
| 819 | + hours = num; | |
| 820 | + countDelim++; | |
| 821 | + num = 0; | |
| 822 | + len = 0; | |
| 823 | + continue; | |
| 824 | + } | |
| 825 | + if (c < '0' || c > '9') { | |
| 826 | + return null; | |
| 827 | + } | |
| 828 | + num = num * 10 + (c - '0'); | |
| 829 | + len++; | |
| 830 | + } | |
| 831 | + if (index != length) { | |
| 832 | + return null; | |
| 833 | + } | |
| 834 | + if (countDelim == 0) { | |
| 835 | + if (len <= 2) { | |
| 836 | + hours = num; | |
| 837 | + num = 0; | |
| 838 | + } else { | |
| 839 | + hours = num / 100; | |
| 840 | + num %= 100; | |
| 841 | + } | |
| 842 | + } else { | |
| 843 | + if (len != 2) { | |
| 844 | + return null; | |
| 845 | + } | |
| 846 | + } | |
| 847 | + if (hours > 23 || num > 59) { | |
| 848 | + return null; | |
| 849 | + } | |
| 850 | + int gmtOffset = (hours * 60 + num) * 60 * 1000; | |
| 851 | + | |
| 852 | + if (gmtOffset == 0) { | |
| 853 | + zi = ZoneInfoFile.getZoneInfo(GMT_ID); | |
| 854 | + if (negative) { | |
| 855 | + zi.setID("GMT-00:00"); | |
| 856 | + } else { | |
| 857 | + zi.setID("GMT+00:00"); | |
| 858 | + } | |
| 859 | + } else { | |
| 860 | + zi = ZoneInfoFile.getCustomTimeZone(id, negative ? -gmtOffset : gmtOffset); | |
| 861 | + } | |
| 862 | + return zi; | |
| 863 | + } | |
| 864 | +} | |