icuSources/i18n/simpletz.cpp

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4  *******************************************************************************
   5  * Copyright (C) 1997-2013, International Business Machines Corporation and
   6  * others. All Rights Reserved.
   7  *******************************************************************************
   8  *
   9  * File SIMPLETZ.H
  10  *
  11  * Modification History:
  12  *
  13  *   Date        Name        Description
  14  *   12/05/96    clhuang     Creation.
  15  *   04/21/97    aliu        Fixed miscellaneous bugs found by inspection and
  16  *                           testing.
  17  *   07/29/97    aliu        Ported source bodies back from Java version with
  18  *                           numerous feature enhancements and bug fixes.
  19  *   08/10/98    stephen     JDK 1.2 sync.
  20  *   09/17/98    stephen     Fixed getOffset() for last hour of year and DST
  21  *   12/02/99    aliu        Added TimeMode and constructor and setStart/EndRule
  22  *                           methods that take TimeMode. Whitespace cleanup.
  23  ********************************************************************************
  24  */
  25
  26 #include "utypeinfo.h"  // for 'typeid' to work
  27
  28 #include "unicode/utypes.h"
  29
  30 #if !UCONFIG_NO_FORMATTING
  31
  32 #include "unicode/simpletz.h"
  33 #include "unicode/gregocal.h"
  34 #include "unicode/smpdtfmt.h"
  35
  36 #include "gregoimp.h"
  37 #include "umutex.h"
  38
  39 U_NAMESPACE_BEGIN
  40
  41 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(SimpleTimeZone)
  42
  43 // Use only for decodeStartRule() and decodeEndRule() where the year is not
  44 // available. Set February to 29 days to accomodate rules with that date
  45 // and day-of-week-on-or-before-that-date mode (DOW_LE_DOM_MODE).
  46 // The compareToRule() method adjusts to February 28 in non-leap years.
  47 //
  48 // For actual getOffset() calculations, use Grego::monthLength() and
  49 // Grego::previousMonthLength() which take leap years into account.
  50 // We handle leap years assuming always
  51 // Gregorian, since we know they didn't have daylight time when
  52 // Gregorian calendar started.
  53 const int8_t SimpleTimeZone::STATICMONTHLENGTH[] = {31,29,31,30,31,30,31,31,30,31,30,31};
  54
  55 static const UChar DST_STR[] = {0x0028,0x0044,0x0053,0x0054,0x0029,0}; // "(DST)"
  56 static const UChar STD_STR[] = {0x0028,0x0053,0x0054,0x0044,0x0029,0}; // "(STD)"
  57
  58
  59 // *****************************************************************************
  60 // class SimpleTimeZone
  61 // *****************************************************************************
  62
  63
  64 SimpleTimeZone::SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID)
  65 :   BasicTimeZone(ID),
  66     startMonth(0),
  67     startDay(0),
  68     startDayOfWeek(0),
  69     startTime(0),
  70     startTimeMode(WALL_TIME),
  71     endTimeMode(WALL_TIME),
  72     endMonth(0),
  73     endDay(0),
  74     endDayOfWeek(0),
  75     endTime(0),
  76     startYear(0),
  77     rawOffset(rawOffsetGMT),
  78     useDaylight(FALSE),
  79     startMode(DOM_MODE),
  80     endMode(DOM_MODE),
  81     dstSavings(U_MILLIS_PER_HOUR)
  82 {
  83     clearTransitionRules();
  84 }
  85
  86 // -------------------------------------
  87
  88 SimpleTimeZone::SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID,
  89     int8_t savingsStartMonth, int8_t savingsStartDay,
  90     int8_t savingsStartDayOfWeek, int32_t savingsStartTime,
  91     int8_t savingsEndMonth, int8_t savingsEndDay,
  92     int8_t savingsEndDayOfWeek, int32_t savingsEndTime,
  93     UErrorCode& status)
  94 :   BasicTimeZone(ID)
  95 {
  96     clearTransitionRules();
  97     construct(rawOffsetGMT,
  98               savingsStartMonth, savingsStartDay, savingsStartDayOfWeek,
  99               savingsStartTime, WALL_TIME,
 100               savingsEndMonth, savingsEndDay, savingsEndDayOfWeek,
 101               savingsEndTime, WALL_TIME,
 102               U_MILLIS_PER_HOUR, status);
 103 }
 104
 105 // -------------------------------------
 106
 107 SimpleTimeZone::SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID,
 108     int8_t savingsStartMonth, int8_t savingsStartDay,
 109     int8_t savingsStartDayOfWeek, int32_t savingsStartTime,
 110     int8_t savingsEndMonth, int8_t savingsEndDay,
 111     int8_t savingsEndDayOfWeek, int32_t savingsEndTime,
 112     int32_t savingsDST, UErrorCode& status)
 113 :   BasicTimeZone(ID)
 114 {
 115     clearTransitionRules();
 116     construct(rawOffsetGMT,
 117               savingsStartMonth, savingsStartDay, savingsStartDayOfWeek,
 118               savingsStartTime, WALL_TIME,
 119               savingsEndMonth, savingsEndDay, savingsEndDayOfWeek,
 120               savingsEndTime, WALL_TIME,
 121               savingsDST, status);
 122 }
 123
 124 // -------------------------------------
 125
 126 SimpleTimeZone::SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID,
 127     int8_t savingsStartMonth, int8_t savingsStartDay,
 128     int8_t savingsStartDayOfWeek, int32_t savingsStartTime,
 129     TimeMode savingsStartTimeMode,
 130     int8_t savingsEndMonth, int8_t savingsEndDay,
 131     int8_t savingsEndDayOfWeek, int32_t savingsEndTime,
 132     TimeMode savingsEndTimeMode,
 133     int32_t savingsDST, UErrorCode& status)
 134 :   BasicTimeZone(ID)
 135 {
 136     clearTransitionRules();
 137     construct(rawOffsetGMT,
 138               savingsStartMonth, savingsStartDay, savingsStartDayOfWeek,
 139               savingsStartTime, savingsStartTimeMode,
 140               savingsEndMonth, savingsEndDay, savingsEndDayOfWeek,
 141               savingsEndTime, savingsEndTimeMode,
 142               savingsDST, status);
 143 }
 144
 145 /**
 146  * Internal construction method.
 147  */
 148 void SimpleTimeZone::construct(int32_t rawOffsetGMT,
 149                                int8_t savingsStartMonth,
 150                                int8_t savingsStartDay,
 151                                int8_t savingsStartDayOfWeek,
 152                                int32_t savingsStartTime,
 153                                TimeMode savingsStartTimeMode,
 154                                int8_t savingsEndMonth,
 155                                int8_t savingsEndDay,
 156                                int8_t savingsEndDayOfWeek,
 157                                int32_t savingsEndTime,
 158                                TimeMode savingsEndTimeMode,
 159                                int32_t savingsDST,
 160                                UErrorCode& status)
 161 {
 162     this->rawOffset      = rawOffsetGMT;
 163     this->startMonth     = savingsStartMonth;
 164     this->startDay       = savingsStartDay;
 165     this->startDayOfWeek = savingsStartDayOfWeek;
 166     this->startTime      = savingsStartTime;
 167     this->startTimeMode  = savingsStartTimeMode;
 168     this->endMonth       = savingsEndMonth;
 169     this->endDay         = savingsEndDay;
 170     this->endDayOfWeek   = savingsEndDayOfWeek;
 171     this->endTime        = savingsEndTime;
 172     this->endTimeMode    = savingsEndTimeMode;
 173     this->dstSavings     = savingsDST;
 174     this->startYear      = 0;
 175     this->startMode      = DOM_MODE;
 176     this->endMode        = DOM_MODE;
 177
 178     decodeRules(status);
 179
 180     if (savingsDST <= 0) {
 181         status = U_ILLEGAL_ARGUMENT_ERROR;
 182     }
 183 }
 184
 185 // -------------------------------------
 186
 187 SimpleTimeZone::~SimpleTimeZone()
 188 {
 189     deleteTransitionRules();
 190 }
 191
 192 // -------------------------------------
 193
 194 // Called by TimeZone::createDefault(), then clone() inside a Mutex - be careful.
 195 SimpleTimeZone::SimpleTimeZone(const SimpleTimeZone &source)
 196 :   BasicTimeZone(source)
 197 {
 198     *this = source;
 199 }
 200
 201 // -------------------------------------
 202
 203 // Called by TimeZone::createDefault(), then clone() inside a Mutex - be careful.
 204 SimpleTimeZone &
 205 SimpleTimeZone::operator=(const SimpleTimeZone &right)
 206 {
 207     if (this != &right)
 208     {
 209         TimeZone::operator=(right);
 210         rawOffset      = right.rawOffset;
 211         startMonth     = right.startMonth;
 212         startDay       = right.startDay;
 213         startDayOfWeek = right.startDayOfWeek;
 214         startTime      = right.startTime;
 215         startTimeMode  = right.startTimeMode;
 216         startMode      = right.startMode;
 217         endMonth       = right.endMonth;
 218         endDay         = right.endDay;
 219         endDayOfWeek   = right.endDayOfWeek;
 220         endTime        = right.endTime;
 221         endTimeMode    = right.endTimeMode;
 222         endMode        = right.endMode;
 223         startYear      = right.startYear;
 224         dstSavings     = right.dstSavings;
 225         useDaylight    = right.useDaylight;
 226         clearTransitionRules();
 227     }
 228     return *this;
 229 }
 230
 231 // -------------------------------------
 232
 233 UBool
 234 SimpleTimeZone::operator==(const TimeZone& that) const
 235 {
 236     return ((this == &that) ||
 237             (typeid(*this) == typeid(that) &&
 238             TimeZone::operator==(that) &&
 239             hasSameRules(that)));
 240 }
 241
 242 // -------------------------------------
 243
 244 // Called by TimeZone::createDefault() inside a Mutex - be careful.
 245 TimeZone*
 246 SimpleTimeZone::clone() const
 247 {
 248     return new SimpleTimeZone(*this);
 249 }
 250
 251 // -------------------------------------
 252
 253 /**
 254  * Sets the daylight savings starting year, that is, the year this time zone began
 255  * observing its specified daylight savings time rules.  The time zone is considered
 256  * not to observe daylight savings time prior to that year; SimpleTimeZone doesn't
 257  * support historical daylight-savings-time rules.
 258  * @param year the daylight savings starting year.
 259  */
 260 void
 261 SimpleTimeZone::setStartYear(int32_t year)
 262 {
 263     startYear = year;
 264     transitionRulesInitialized = FALSE;
 265 }
 266
 267 // -------------------------------------
 268
 269 /**
 270  * Sets the daylight savings starting rule. For example, in the U.S., Daylight Savings
 271  * Time starts at the first Sunday in April, at 2 AM in standard time.
 272  * Therefore, you can set the start rule by calling:
 273  * setStartRule(TimeFields.APRIL, 1, TimeFields.SUNDAY, 2*60*60*1000);
 274  * The dayOfWeekInMonth and dayOfWeek parameters together specify how to calculate
 275  * the exact starting date.  Their exact meaning depend on their respective signs,
 276  * allowing various types of rules to be constructed, as follows:<ul>
 277  *   <li>If both dayOfWeekInMonth and dayOfWeek are positive, they specify the
 278  *       day of week in the month (e.g., (2, WEDNESDAY) is the second Wednesday
 279  *       of the month).
 280  *   <li>If dayOfWeek is positive and dayOfWeekInMonth is negative, they specify
 281  *       the day of week in the month counting backward from the end of the month.
 282  *       (e.g., (-1, MONDAY) is the last Monday in the month)
 283  *   <li>If dayOfWeek is zero and dayOfWeekInMonth is positive, dayOfWeekInMonth
 284  *       specifies the day of the month, regardless of what day of the week it is.
 285  *       (e.g., (10, 0) is the tenth day of the month)
 286  *   <li>If dayOfWeek is zero and dayOfWeekInMonth is negative, dayOfWeekInMonth
 287  *       specifies the day of the month counting backward from the end of the
 288  *       month, regardless of what day of the week it is (e.g., (-2, 0) is the
 289  *       next-to-last day of the month).
 290  *   <li>If dayOfWeek is negative and dayOfWeekInMonth is positive, they specify the
 291  *       first specified day of the week on or after the specfied day of the month.
 292  *       (e.g., (15, -SUNDAY) is the first Sunday after the 15th of the month
 293  *       [or the 15th itself if the 15th is a Sunday].)
 294  *   <li>If dayOfWeek and DayOfWeekInMonth are both negative, they specify the
 295  *       last specified day of the week on or before the specified day of the month.
 296  *       (e.g., (-20, -TUESDAY) is the last Tuesday before the 20th of the month
 297  *       [or the 20th itself if the 20th is a Tuesday].)</ul>
 298  * @param month the daylight savings starting month. Month is 0-based.
 299  * eg, 0 for January.
 300  * @param dayOfWeekInMonth the daylight savings starting
 301  * day-of-week-in-month. Please see the member description for an example.
 302  * @param dayOfWeek the daylight savings starting day-of-week. Please see
 303  * the member description for an example.
 304  * @param time the daylight savings starting time. Please see the member
 305  * description for an example.
 306  */
 307
 308 void
 309 SimpleTimeZone::setStartRule(int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek,
 310                              int32_t time, TimeMode mode, UErrorCode& status)
 311 {
 312     startMonth     = (int8_t)month;
 313     startDay       = (int8_t)dayOfWeekInMonth;
 314     startDayOfWeek = (int8_t)dayOfWeek;
 315     startTime      = time;
 316     startTimeMode  = mode;
 317     decodeStartRule(status);
 318     transitionRulesInitialized = FALSE;
 319 }
 320
 321 // -------------------------------------
 322
 323 void
 324 SimpleTimeZone::setStartRule(int32_t month, int32_t dayOfMonth,
 325                              int32_t time, TimeMode mode, UErrorCode& status)
 326 {
 327     setStartRule(month, dayOfMonth, 0, time, mode, status);
 328 }
 329
 330 // -------------------------------------
 331
 332 void
 333 SimpleTimeZone::setStartRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
 334                              int32_t time, TimeMode mode, UBool after, UErrorCode& status)
 335 {
 336     setStartRule(month, after ? dayOfMonth : -dayOfMonth,
 337                  -dayOfWeek, time, mode, status);
 338 }
 339
 340 // -------------------------------------
 341
 342 /**
 343  * Sets the daylight savings ending rule. For example, in the U.S., Daylight
 344  * Savings Time ends at the last (-1) Sunday in October, at 2 AM in standard time.
 345  * Therefore, you can set the end rule by calling:
 346  * setEndRule(TimeFields.OCTOBER, -1, TimeFields.SUNDAY, 2*60*60*1000);
 347  * Various other types of rules can be specified by manipulating the dayOfWeek
 348  * and dayOfWeekInMonth parameters.  For complete details, see the documentation
 349  * for setStartRule().
 350  * @param month the daylight savings ending month. Month is 0-based.
 351  * eg, 0 for January.
 352  * @param dayOfWeekInMonth the daylight savings ending
 353  * day-of-week-in-month. See setStartRule() for a complete explanation.
 354  * @param dayOfWeek the daylight savings ending day-of-week. See setStartRule()
 355  * for a complete explanation.
 356  * @param time the daylight savings ending time. Please see the member
 357  * description for an example.
 358  */
 359
 360 void
 361 SimpleTimeZone::setEndRule(int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek,
 362                            int32_t time, TimeMode mode, UErrorCode& status)
 363 {
 364     endMonth     = (int8_t)month;
 365     endDay       = (int8_t)dayOfWeekInMonth;
 366     endDayOfWeek = (int8_t)dayOfWeek;
 367     endTime      = time;
 368     endTimeMode  = mode;
 369     decodeEndRule(status);
 370     transitionRulesInitialized = FALSE;
 371 }
 372
 373 // -------------------------------------
 374
 375 void
 376 SimpleTimeZone::setEndRule(int32_t month, int32_t dayOfMonth,
 377                            int32_t time, TimeMode mode, UErrorCode& status)
 378 {
 379     setEndRule(month, dayOfMonth, 0, time, mode, status);
 380 }
 381
 382 // -------------------------------------
 383
 384 void
 385 SimpleTimeZone::setEndRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
 386                            int32_t time, TimeMode mode, UBool after, UErrorCode& status)
 387 {
 388     setEndRule(month, after ? dayOfMonth : -dayOfMonth,
 389                -dayOfWeek, time, mode, status);
 390 }
 391
 392 // -------------------------------------
 393
 394 int32_t
 395 SimpleTimeZone::getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
 396                           uint8_t dayOfWeek, int32_t millis, UErrorCode& status) const
 397 {
 398     // Check the month before calling Grego::monthLength(). This
 399     // duplicates the test that occurs in the 7-argument getOffset(),
 400     // however, this is unavoidable. We don't mind because this method, in
 401     // fact, should not be called; internal code should always call the
 402     // 7-argument getOffset(), and outside code should use Calendar.get(int
 403     // field) with fields ZONE_OFFSET and DST_OFFSET. We can't get rid of
 404     // this method because it's public API. - liu 8/10/98
 405     if(month < UCAL_JANUARY || month > UCAL_DECEMBER) {
 406         status = U_ILLEGAL_ARGUMENT_ERROR;
 407         return 0;
 408     }
 409
 410     return getOffset(era, year, month, day, dayOfWeek, millis, Grego::monthLength(year, month), status);
 411 }
 412
 413 int32_t
 414 SimpleTimeZone::getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
 415                           uint8_t dayOfWeek, int32_t millis,
 416                           int32_t /*monthLength*/, UErrorCode& status) const
 417 {
 418     // Check the month before calling Grego::monthLength(). This
 419     // duplicates a test that occurs in the 9-argument getOffset(),
 420     // however, this is unavoidable. We don't mind because this method, in
 421     // fact, should not be called; internal code should always call the
 422     // 9-argument getOffset(), and outside code should use Calendar.get(int
 423     // field) with fields ZONE_OFFSET and DST_OFFSET. We can't get rid of
 424     // this method because it's public API. - liu 8/10/98
 425     if (month < UCAL_JANUARY
 426         || month > UCAL_DECEMBER) {
 427         status = U_ILLEGAL_ARGUMENT_ERROR;
 428         return -1;
 429     }
 430
 431     // We ignore monthLength because it can be derived from year and month.
 432     // This is so that February in leap years is calculated correctly.
 433     // We keep this argument in this function for backwards compatibility.
 434     return getOffset(era, year, month, day, dayOfWeek, millis,
 435                      Grego::monthLength(year, month),
 436                      Grego::previousMonthLength(year, month),
 437                      status);
 438 }
 439
 440 int32_t
 441 SimpleTimeZone::getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
 442                           uint8_t dayOfWeek, int32_t millis,
 443                           int32_t monthLength, int32_t prevMonthLength,
 444                           UErrorCode& status) const
 445 {
 446     if(U_FAILURE(status)) return 0;
 447
 448     if ((era != GregorianCalendar::AD && era != GregorianCalendar::BC)
 449         || month < UCAL_JANUARY
 450         || month > UCAL_DECEMBER
 451         || day < 1
 452         || day > monthLength
 453         || dayOfWeek < UCAL_SUNDAY
 454         || dayOfWeek > UCAL_SATURDAY
 455         || millis < 0
 456         || millis >= U_MILLIS_PER_DAY
 457         || monthLength < 28
 458         || monthLength > 31
 459         || prevMonthLength < 28
 460         || prevMonthLength > 31) {
 461         status = U_ILLEGAL_ARGUMENT_ERROR;
 462         return -1;
 463     }
 464
 465     int32_t result = rawOffset;
 466
 467     // Bail out if we are before the onset of daylight savings time
 468     if(!useDaylight || year < startYear || era != GregorianCalendar::AD)
 469         return result;
 470
 471     // Check for southern hemisphere.  We assume that the start and end
 472     // month are different.
 473     UBool southern = (startMonth > endMonth);
 474
 475     // Compare the date to the starting and ending rules.+1 = date>rule, -1
 476     // = date<rule, 0 = date==rule.
 477     int32_t startCompare = compareToRule((int8_t)month, (int8_t)monthLength, (int8_t)prevMonthLength,
 478                                          (int8_t)day, (int8_t)dayOfWeek, millis,
 479                                          startTimeMode == UTC_TIME ? -rawOffset : 0,
 480                                          startMode, (int8_t)startMonth, (int8_t)startDayOfWeek,
 481                                          (int8_t)startDay, startTime);
 482     int32_t endCompare = 0;
 483
 484     /* We don't always have to compute endCompare.  For many instances,
 485      * startCompare is enough to determine if we are in DST or not.  In the
 486      * northern hemisphere, if we are before the start rule, we can't have
 487      * DST.  In the southern hemisphere, if we are after the start rule, we
 488      * must have DST.  This is reflected in the way the next if statement
 489      * (not the one immediately following) short circuits. */
 490     if(southern != (startCompare >= 0)) {
 491         endCompare = compareToRule((int8_t)month, (int8_t)monthLength, (int8_t)prevMonthLength,
 492                                    (int8_t)day, (int8_t)dayOfWeek, millis,
 493                                    endTimeMode == WALL_TIME ? dstSavings :
 494                                     (endTimeMode == UTC_TIME ? -rawOffset : 0),
 495                                    endMode, (int8_t)endMonth, (int8_t)endDayOfWeek,
 496                                    (int8_t)endDay, endTime);
 497     }
 498
 499     // Check for both the northern and southern hemisphere cases.  We
 500     // assume that in the northern hemisphere, the start rule is before the
 501     // end rule within the calendar year, and vice versa for the southern
 502     // hemisphere.
 503     if ((!southern && (startCompare >= 0 && endCompare < 0)) ||
 504         (southern && (startCompare >= 0 || endCompare < 0)))
 505         result += dstSavings;
 506
 507     return result;
 508 }
 509
 510 void
 511 SimpleTimeZone::getOffsetFromLocal(UDate date, int32_t nonExistingTimeOpt, int32_t duplicatedTimeOpt,
 512                                    int32_t& rawOffsetGMT, int32_t& savingsDST, UErrorCode& status) const {
 513     if (U_FAILURE(status)) {
 514         return;
 515     }
 516
 517     rawOffsetGMT = getRawOffset();
 518     int32_t year, month, dom, dow;
 519     double day = uprv_floor(date / U_MILLIS_PER_DAY);
 520     int32_t millis = (int32_t) (date - day * U_MILLIS_PER_DAY);
 521
 522     Grego::dayToFields(day, year, month, dom, dow);
 523
 524     savingsDST = getOffset(GregorianCalendar::AD, year, month, dom,
 525                           (uint8_t) dow, millis,
 526                           Grego::monthLength(year, month),
 527                           status) - rawOffsetGMT;
 528     if (U_FAILURE(status)) {
 529         return;
 530     }
 531
 532     UBool recalc = FALSE;
 533
 534     // Now we need some adjustment
 535     if (savingsDST > 0) {
 536         if ((nonExistingTimeOpt & kStdDstMask) == kStandard
 537             || ((nonExistingTimeOpt & kStdDstMask) != kDaylight && (nonExistingTimeOpt & kFormerLatterMask) != kLatter)) {
 538             date -= getDSTSavings();
 539             recalc = TRUE;
 540         }
 541     } else {
 542         if ((duplicatedTimeOpt & kStdDstMask) == kDaylight
 543                 || ((duplicatedTimeOpt & kStdDstMask) != kStandard && (duplicatedTimeOpt & kFormerLatterMask) == kFormer)) {
 544             date -= getDSTSavings();
 545             recalc = TRUE;
 546         }
 547     }
 548     if (recalc) {
 549         day = uprv_floor(date / U_MILLIS_PER_DAY);
 550         millis = (int32_t) (date - day * U_MILLIS_PER_DAY);
 551         Grego::dayToFields(day, year, month, dom, dow);
 552         savingsDST = getOffset(GregorianCalendar::AD, year, month, dom,
 553                           (uint8_t) dow, millis,
 554                           Grego::monthLength(year, month),
 555                           status) - rawOffsetGMT;
 556     }
 557 }
 558
 559 // -------------------------------------
 560
 561 /**
 562  * Compare a given date in the year to a rule. Return 1, 0, or -1, depending
 563  * on whether the date is after, equal to, or before the rule date. The
 564  * millis are compared directly against the ruleMillis, so any
 565  * standard-daylight adjustments must be handled by the caller.
 566  *
 567  * @return  1 if the date is after the rule date, -1 if the date is before
 568  *          the rule date, or 0 if the date is equal to the rule date.
 569  */
 570 int32_t
 571 SimpleTimeZone::compareToRule(int8_t month, int8_t monthLen, int8_t prevMonthLen,
 572                               int8_t dayOfMonth,
 573                               int8_t dayOfWeek, int32_t millis, int32_t millisDelta,
 574                               EMode ruleMode, int8_t ruleMonth, int8_t ruleDayOfWeek,
 575                               int8_t ruleDay, int32_t ruleMillis)
 576 {
 577     // Make adjustments for startTimeMode and endTimeMode
 578     millis += millisDelta;
 579     while (millis >= U_MILLIS_PER_DAY) {
 580         millis -= U_MILLIS_PER_DAY;
 581         ++dayOfMonth;
 582         dayOfWeek = (int8_t)(1 + (dayOfWeek % 7)); // dayOfWeek is one-based
 583         if (dayOfMonth > monthLen) {
 584             dayOfMonth = 1;
 585             /* When incrementing the month, it is desirible to overflow
 586              * from DECEMBER to DECEMBER+1, since we use the result to
 587              * compare against a real month. Wraparound of the value
 588              * leads to bug 4173604. */
 589             ++month;
 590         }
 591     }
 592     while (millis < 0) {
 593         millis += U_MILLIS_PER_DAY;
 594         --dayOfMonth;
 595         dayOfWeek = (int8_t)(1 + ((dayOfWeek+5) % 7)); // dayOfWeek is one-based
 596         if (dayOfMonth < 1) {
 597             dayOfMonth = prevMonthLen;
 598             --month;
 599         }
 600     }
 601
 602     // first compare months.  If they're different, we don't have to worry about days
 603     // and times
 604     if (month < ruleMonth) return -1;
 605     else if (month > ruleMonth) return 1;
 606
 607     // calculate the actual day of month for the rule
 608     int32_t ruleDayOfMonth = 0;
 609
 610     // Adjust the ruleDay to the monthLen, for non-leap year February 29 rule days.
 611     if (ruleDay > monthLen) {
 612         ruleDay = monthLen;
 613     }
 614
 615     switch (ruleMode)
 616     {
 617     // if the mode is day-of-month, the day of month is given
 618     case DOM_MODE:
 619         ruleDayOfMonth = ruleDay;
 620         break;
 621
 622     // if the mode is day-of-week-in-month, calculate the day-of-month from it
 623     case DOW_IN_MONTH_MODE:
 624         // In this case ruleDay is the day-of-week-in-month (this code is using
 625         // the dayOfWeek and dayOfMonth parameters to figure out the day-of-week
 626         // of the first day of the month, so it's trusting that they're really
 627         // consistent with each other)
 628         if (ruleDay > 0)
 629             ruleDayOfMonth = 1 + (ruleDay - 1) * 7 +
 630                 (7 + ruleDayOfWeek - (dayOfWeek - dayOfMonth + 1)) % 7;
 631
 632         // if ruleDay is negative (we assume it's not zero here), we have to do
 633         // the same calculation figuring backward from the last day of the month.
 634         else
 635         {
 636             // (again, this code is trusting that dayOfWeek and dayOfMonth are
 637             // consistent with each other here, since we're using them to figure
 638             // the day of week of the first of the month)
 639             ruleDayOfMonth = monthLen + (ruleDay + 1) * 7 -
 640                 (7 + (dayOfWeek + monthLen - dayOfMonth) - ruleDayOfWeek) % 7;
 641         }
 642         break;
 643
 644     case DOW_GE_DOM_MODE:
 645         ruleDayOfMonth = ruleDay +
 646             (49 + ruleDayOfWeek - ruleDay - dayOfWeek + dayOfMonth) % 7;
 647         break;
 648
 649     case DOW_LE_DOM_MODE:
 650         ruleDayOfMonth = ruleDay -
 651             (49 - ruleDayOfWeek + ruleDay + dayOfWeek - dayOfMonth) % 7;
 652         // Note at this point ruleDayOfMonth may be <1, although it will
 653         // be >=1 for well-formed rules.
 654         break;
 655     }
 656
 657     // now that we have a real day-in-month for the rule, we can compare days...
 658     if (dayOfMonth < ruleDayOfMonth) return -1;
 659     else if (dayOfMonth > ruleDayOfMonth) return 1;
 660
 661     // ...and if they're equal, we compare times
 662     if (millis < ruleMillis) return -1;
 663     else if (millis > ruleMillis) return 1;
 664     else return 0;
 665 }
 666
 667 // -------------------------------------
 668
 669 int32_t
 670 SimpleTimeZone::getRawOffset() const
 671 {
 672     return rawOffset;
 673 }
 674
 675 // -------------------------------------
 676
 677 void
 678 SimpleTimeZone::setRawOffset(int32_t offsetMillis)
 679 {
 680     rawOffset = offsetMillis;
 681     transitionRulesInitialized = FALSE;
 682 }
 683
 684 // -------------------------------------
 685
 686 void
 687 SimpleTimeZone::setDSTSavings(int32_t millisSavedDuringDST, UErrorCode& status)
 688 {
 689     if (millisSavedDuringDST <= 0) {
 690         status = U_ILLEGAL_ARGUMENT_ERROR;
 691     }
 692     else {
 693         dstSavings = millisSavedDuringDST;
 694     }
 695     transitionRulesInitialized = FALSE;
 696 }
 697
 698 // -------------------------------------
 699
 700 int32_t
 701 SimpleTimeZone::getDSTSavings() const
 702 {
 703     return dstSavings;
 704 }
 705
 706 // -------------------------------------
 707
 708 UBool
 709 SimpleTimeZone::useDaylightTime() const
 710 {
 711     return useDaylight;
 712 }
 713
 714 // -------------------------------------
 715
 716 /**
 717  * Overrides TimeZone
 718  * Queries if the given date is in Daylight Savings Time.
 719  */
 720 UBool SimpleTimeZone::inDaylightTime(UDate date, UErrorCode& status) const
 721 {
 722     // This method is wasteful since it creates a new GregorianCalendar and
 723     // deletes it each time it is called.  However, this is a deprecated method
 724     // and provided only for Java compatibility as of 8/6/97 [LIU].
 725     if (U_FAILURE(status)) return FALSE;
 726     GregorianCalendar *gc = new GregorianCalendar(*this, status);
 727     /* test for NULL */
 728     if (gc == 0) {
 729         status = U_MEMORY_ALLOCATION_ERROR;
 730         return FALSE;
 731     }
 732     gc->setTime(date, status);
 733     UBool result = gc->inDaylightTime(status);
 734     delete gc;
 735     return result;
 736 }
 737
 738 // -------------------------------------
 739
 740 /**
 741  * Return true if this zone has the same rules and offset as another zone.
 742  * @param other the TimeZone object to be compared with
 743  * @return true if the given zone has the same rules and offset as this one
 744  */
 745 UBool
 746 SimpleTimeZone::hasSameRules(const TimeZone& other) const
 747 {
 748     if (this == &other) return TRUE;
 749     if (typeid(*this) != typeid(other)) return FALSE;
 750     SimpleTimeZone *that = (SimpleTimeZone*)&other;
 751     return rawOffset     == that->rawOffset &&
 752         useDaylight     == that->useDaylight &&
 753         (!useDaylight
 754          // Only check rules if using DST
 755          || (dstSavings     == that->dstSavings &&
 756              startMode      == that->startMode &&
 757              startMonth     == that->startMonth &&
 758              startDay       == that->startDay &&
 759              startDayOfWeek == that->startDayOfWeek &&
 760              startTime      == that->startTime &&
 761              startTimeMode  == that->startTimeMode &&
 762              endMode        == that->endMode &&
 763              endMonth       == that->endMonth &&
 764              endDay         == that->endDay &&
 765              endDayOfWeek   == that->endDayOfWeek &&
 766              endTime        == that->endTime &&
 767              endTimeMode    == that->endTimeMode &&
 768              startYear      == that->startYear));
 769 }
 770
 771 // -------------------------------------
 772
 773 //----------------------------------------------------------------------
 774 // Rule representation
 775 //
 776 // We represent the following flavors of rules:
 777 //       5        the fifth of the month
 778 //       lastSun  the last Sunday in the month
 779 //       lastMon  the last Monday in the month
 780 //       Sun>=8   first Sunday on or after the eighth
 781 //       Sun<=25  last Sunday on or before the 25th
 782 // This is further complicated by the fact that we need to remain
 783 // backward compatible with the 1.1 FCS.  Finally, we need to minimize
 784 // API changes.  In order to satisfy these requirements, we support
 785 // three representation systems, and we translate between them.
 786 //
 787 // INTERNAL REPRESENTATION
 788 // This is the format SimpleTimeZone objects take after construction or
 789 // streaming in is complete.  Rules are represented directly, using an
 790 // unencoded format.  We will discuss the start rule only below; the end
 791 // rule is analogous.
 792 //   startMode      Takes on enumerated values DAY_OF_MONTH,
 793 //                  DOW_IN_MONTH, DOW_AFTER_DOM, or DOW_BEFORE_DOM.
 794 //   startDay       The day of the month, or for DOW_IN_MONTH mode, a
 795 //                  value indicating which DOW, such as +1 for first,
 796 //                  +2 for second, -1 for last, etc.
 797 //   startDayOfWeek The day of the week.  Ignored for DAY_OF_MONTH.
 798 //
 799 // ENCODED REPRESENTATION
 800 // This is the format accepted by the constructor and by setStartRule()
 801 // and setEndRule().  It uses various combinations of positive, negative,
 802 // and zero values to encode the different rules.  This representation
 803 // allows us to specify all the different rule flavors without altering
 804 // the API.
 805 //   MODE              startMonth    startDay    startDayOfWeek
 806 //   DOW_IN_MONTH_MODE >=0           !=0         >0
 807 //   DOM_MODE          >=0           >0          ==0
 808 //   DOW_GE_DOM_MODE   >=0           >0          <0
 809 //   DOW_LE_DOM_MODE   >=0           <0          <0
 810 //   (no DST)          don't care    ==0         don't care
 811 //
 812 // STREAMED REPRESENTATION
 813 // We must retain binary compatibility with the 1.1 FCS.  The 1.1 code only
 814 // handles DOW_IN_MONTH_MODE and non-DST mode, the latter indicated by the
 815 // flag useDaylight.  When we stream an object out, we translate into an
 816 // approximate DOW_IN_MONTH_MODE representation so the object can be parsed
 817 // and used by 1.1 code.  Following that, we write out the full
 818 // representation separately so that contemporary code can recognize and
 819 // parse it.  The full representation is written in a "packed" format,
 820 // consisting of a version number, a length, and an array of bytes.  Future
 821 // versions of this class may specify different versions.  If they wish to
 822 // include additional data, they should do so by storing them after the
 823 // packed representation below.
 824 //----------------------------------------------------------------------
 825
 826 /**
 827  * Given a set of encoded rules in startDay and startDayOfMonth, decode
 828  * them and set the startMode appropriately.  Do the same for endDay and
 829  * endDayOfMonth.  Upon entry, the day of week variables may be zero or
 830  * negative, in order to indicate special modes.  The day of month
 831  * variables may also be negative.  Upon exit, the mode variables will be
 832  * set, and the day of week and day of month variables will be positive.
 833  * This method also recognizes a startDay or endDay of zero as indicating
 834  * no DST.
 835  */
 836 void
 837 SimpleTimeZone::decodeRules(UErrorCode& status)
 838 {
 839     decodeStartRule(status);
 840     decodeEndRule(status);
 841 }
 842
 843 /**
 844  * Decode the start rule and validate the parameters.  The parameters are
 845  * expected to be in encoded form, which represents the various rule modes
 846  * by negating or zeroing certain values.  Representation formats are:
 847  * <p>
 848  * <pre>
 849  *            DOW_IN_MONTH  DOM    DOW>=DOM  DOW<=DOM  no DST
 850  *            ------------  -----  --------  --------  ----------
 851  * month       0..11        same    same      same     don't care
 852  * day        -5..5         1..31   1..31    -1..-31   0
 853  * dayOfWeek   1..7         0      -1..-7    -1..-7    don't care
 854  * time        0..ONEDAY    same    same      same     don't care
 855  * </pre>
 856  * The range for month does not include UNDECIMBER since this class is
 857  * really specific to GregorianCalendar, which does not use that month.
 858  * The range for time includes ONEDAY (vs. ending at ONEDAY-1) because the
 859  * end rule is an exclusive limit point.  That is, the range of times that
 860  * are in DST include those >= the start and < the end.  For this reason,
 861  * it should be possible to specify an end of ONEDAY in order to include the
 862  * entire day.  Although this is equivalent to time 0 of the following day,
 863  * it's not always possible to specify that, for example, on December 31.
 864  * While arguably the start range should still be 0..ONEDAY-1, we keep
 865  * the start and end ranges the same for consistency.
 866  */
 867 void
 868 SimpleTimeZone::decodeStartRule(UErrorCode& status)
 869 {
 870     if(U_FAILURE(status)) return;
 871
 872     useDaylight = (UBool)((startDay != 0) && (endDay != 0) ? TRUE : FALSE);
 873     if (useDaylight && dstSavings == 0) {
 874         dstSavings = U_MILLIS_PER_HOUR;
 875     }
 876     if (startDay != 0) {
 877         if (startMonth < UCAL_JANUARY || startMonth > UCAL_DECEMBER) {
 878             status = U_ILLEGAL_ARGUMENT_ERROR;
 879             return;
 880         }
 881         if (startTime < 0 || startTime > U_MILLIS_PER_DAY ||
 882             startTimeMode < WALL_TIME || startTimeMode > UTC_TIME) {
 883             status = U_ILLEGAL_ARGUMENT_ERROR;
 884             return;
 885         }
 886         if (startDayOfWeek == 0) {
 887             startMode = DOM_MODE;
 888         } else {
 889             if (startDayOfWeek > 0) {
 890                 startMode = DOW_IN_MONTH_MODE;
 891             } else {
 892                 startDayOfWeek = (int8_t)-startDayOfWeek;
 893                 if (startDay > 0) {
 894                     startMode = DOW_GE_DOM_MODE;
 895                 } else {
 896                     startDay = (int8_t)-startDay;
 897                     startMode = DOW_LE_DOM_MODE;
 898                 }
 899             }
 900             if (startDayOfWeek > UCAL_SATURDAY) {
 901                 status = U_ILLEGAL_ARGUMENT_ERROR;
 902                 return;
 903             }
 904         }
 905         if (startMode == DOW_IN_MONTH_MODE) {
 906             if (startDay < -5 || startDay > 5) {
 907                 status = U_ILLEGAL_ARGUMENT_ERROR;
 908                 return;
 909             }
 910         } else if (startDay<1 || startDay > STATICMONTHLENGTH[startMonth]) {
 911             status = U_ILLEGAL_ARGUMENT_ERROR;
 912             return;
 913         }
 914     }
 915 }
 916
 917 /**
 918  * Decode the end rule and validate the parameters.  This method is exactly
 919  * analogous to decodeStartRule().
 920  * @see decodeStartRule
 921  */
 922 void
 923 SimpleTimeZone::decodeEndRule(UErrorCode& status)
 924 {
 925     if(U_FAILURE(status)) return;
 926
 927     useDaylight = (UBool)((startDay != 0) && (endDay != 0) ? TRUE : FALSE);
 928     if (useDaylight && dstSavings == 0) {
 929         dstSavings = U_MILLIS_PER_HOUR;
 930     }
 931     if (endDay != 0) {
 932         if (endMonth < UCAL_JANUARY || endMonth > UCAL_DECEMBER) {
 933             status = U_ILLEGAL_ARGUMENT_ERROR;
 934             return;
 935         }
 936         if (endTime < 0 || endTime > U_MILLIS_PER_DAY ||
 937             endTimeMode < WALL_TIME || endTimeMode > UTC_TIME) {
 938             status = U_ILLEGAL_ARGUMENT_ERROR;
 939             return;
 940         }
 941         if (endDayOfWeek == 0) {
 942             endMode = DOM_MODE;
 943         } else {
 944             if (endDayOfWeek > 0) {
 945                 endMode = DOW_IN_MONTH_MODE;
 946             } else {
 947                 endDayOfWeek = (int8_t)-endDayOfWeek;
 948                 if (endDay > 0) {
 949                     endMode = DOW_GE_DOM_MODE;
 950                 } else {
 951                     endDay = (int8_t)-endDay;
 952                     endMode = DOW_LE_DOM_MODE;
 953                 }
 954             }
 955             if (endDayOfWeek > UCAL_SATURDAY) {
 956                 status = U_ILLEGAL_ARGUMENT_ERROR;
 957                 return;
 958             }
 959         }
 960         if (endMode == DOW_IN_MONTH_MODE) {
 961             if (endDay < -5 || endDay > 5) {
 962                 status = U_ILLEGAL_ARGUMENT_ERROR;
 963                 return;
 964             }
 965         } else if (endDay<1 || endDay > STATICMONTHLENGTH[endMonth]) {
 966             status = U_ILLEGAL_ARGUMENT_ERROR;
 967             return;
 968         }
 969     }
 970 }
 971
 972 UBool
 973 SimpleTimeZone::getNextTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const {
 974     if (!useDaylight) {
 975         return FALSE;
 976     }
 977
 978     UErrorCode status = U_ZERO_ERROR;
 979     checkTransitionRules(status);
 980     if (U_FAILURE(status)) {
 981         return FALSE;
 982     }
 983
 984     UDate firstTransitionTime = firstTransition->getTime();
 985     if (base < firstTransitionTime || (inclusive && base == firstTransitionTime)) {
 986         result = *firstTransition;
 987     }
 988     UDate stdDate, dstDate;
 989     UBool stdAvail = stdRule->getNextStart(base, dstRule->getRawOffset(), dstRule->getDSTSavings(), inclusive, stdDate);
 990     UBool dstAvail = dstRule->getNextStart(base, stdRule->getRawOffset(), stdRule->getDSTSavings(), inclusive, dstDate);
 991     if (stdAvail && (!dstAvail || stdDate < dstDate)) {
 992         result.setTime(stdDate);
 993         result.setFrom((const TimeZoneRule&)*dstRule);
 994         result.setTo((const TimeZoneRule&)*stdRule);
 995         return TRUE;
 996     }
 997     if (dstAvail && (!stdAvail || dstDate < stdDate)) {
 998         result.setTime(dstDate);
 999         result.setFrom((const TimeZoneRule&)*stdRule);
1000         result.setTo((const TimeZoneRule&)*dstRule);
1001         return TRUE;
1002     }
1003     return FALSE;
1004 }
1005
1006 UBool
1007 SimpleTimeZone::getPreviousTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const {
1008     if (!useDaylight) {
1009         return FALSE;
1010     }
1011
1012     UErrorCode status = U_ZERO_ERROR;
1013     checkTransitionRules(status);
1014     if (U_FAILURE(status)) {
1015         return FALSE;
1016     }
1017
1018     UDate firstTransitionTime = firstTransition->getTime();
1019     if (base < firstTransitionTime || (!inclusive && base == firstTransitionTime)) {
1020         return FALSE;
1021     }
1022     UDate stdDate, dstDate;
1023     UBool stdAvail = stdRule->getPreviousStart(base, dstRule->getRawOffset(), dstRule->getDSTSavings(), inclusive, stdDate);
1024     UBool dstAvail = dstRule->getPreviousStart(base, stdRule->getRawOffset(), stdRule->getDSTSavings(), inclusive, dstDate);
1025     if (stdAvail && (!dstAvail || stdDate > dstDate)) {
1026         result.setTime(stdDate);
1027         result.setFrom((const TimeZoneRule&)*dstRule);
1028         result.setTo((const TimeZoneRule&)*stdRule);
1029         return TRUE;
1030     }
1031     if (dstAvail && (!stdAvail || dstDate > stdDate)) {
1032         result.setTime(dstDate);
1033         result.setFrom((const TimeZoneRule&)*stdRule);
1034         result.setTo((const TimeZoneRule&)*dstRule);
1035         return TRUE;
1036     }
1037     return FALSE;
1038 }
1039
1040 void
1041 SimpleTimeZone::clearTransitionRules(void) {
1042     initialRule = NULL;
1043     firstTransition = NULL;
1044     stdRule = NULL;
1045     dstRule = NULL;
1046     transitionRulesInitialized = FALSE;
1047 }
1048
1049 void
1050 SimpleTimeZone::deleteTransitionRules(void) {
1051     if (initialRule != NULL) {
1052         delete initialRule;
1053     }
1054     if (firstTransition != NULL) {
1055         delete firstTransition;
1056     }
1057     if (stdRule != NULL) {
1058         delete stdRule;
1059     }
1060     if (dstRule != NULL) {
1061         delete dstRule;
1062     }
1063     clearTransitionRules();
1064  }
1065
1066 /*
1067  * Lazy transition rules initializer
1068  *
1069  *    Note On the removal of UMTX_CHECK from checkTransitionRules():
1070  *
1071  *         It would be faster to have a UInitOnce as part of a SimpleTimeZone object,
1072  *         which would avoid needing to lock a mutex to check the initialization state.
1073  *         But we can't easily because simpletz.h is a public header, and including
1074  *         a UInitOnce as a member of SimpleTimeZone would publicly expose internal ICU headers.
1075  *
1076  *         Alternatively we could have a pointer to a UInitOnce in the SimpleTimeZone object,
1077  *         allocate it in the constructors. This would be a more intrusive change, but doable
1078  *         if performance turns out to be an issue.
1079  */
1080 static UMutex gLock = U_MUTEX_INITIALIZER;
1081
1082 void
1083 SimpleTimeZone::checkTransitionRules(UErrorCode& status) const {
1084     if (U_FAILURE(status)) {
1085         return;
1086     }
1087     umtx_lock(&gLock);
1088     if (!transitionRulesInitialized) {
1089         SimpleTimeZone *ncThis = const_cast<SimpleTimeZone*>(this);
1090         ncThis->initTransitionRules(status);
1091     }
1092     umtx_unlock(&gLock);
1093 }
1094
1095 void
1096 SimpleTimeZone::initTransitionRules(UErrorCode& status) {
1097     if (U_FAILURE(status)) {
1098         return;
1099     }
1100     if (transitionRulesInitialized) {
1101         return;
1102     }
1103     deleteTransitionRules();
1104     UnicodeString tzid;
1105     getID(tzid);
1106
1107     if (useDaylight) {
1108         DateTimeRule* dtRule;
1109         DateTimeRule::TimeRuleType timeRuleType;
1110         UDate firstStdStart, firstDstStart;
1111
1112         // Create a TimeZoneRule for daylight saving time
1113         timeRuleType = (startTimeMode == STANDARD_TIME) ? DateTimeRule::STANDARD_TIME :
1114             ((startTimeMode == UTC_TIME) ? DateTimeRule::UTC_TIME : DateTimeRule::WALL_TIME);
1115         switch (startMode) {
1116         case DOM_MODE:
1117             dtRule = new DateTimeRule(startMonth, startDay, startTime, timeRuleType);
1118             break;
1119         case DOW_IN_MONTH_MODE:
1120             dtRule = new DateTimeRule(startMonth, startDay, startDayOfWeek, startTime, timeRuleType);
1121             break;
1122         case DOW_GE_DOM_MODE:
1123             dtRule = new DateTimeRule(startMonth, startDay, startDayOfWeek, true, startTime, timeRuleType);
1124             break;
1125         case DOW_LE_DOM_MODE:
1126             dtRule = new DateTimeRule(startMonth, startDay, startDayOfWeek, false, startTime, timeRuleType);
1127             break;
1128         default:
1129             status = U_INVALID_STATE_ERROR;
1130             return;
1131         }
1132         // Check for Null pointer
1133         if (dtRule == NULL) {
1134             status = U_MEMORY_ALLOCATION_ERROR;
1135             return;
1136         }
1137         // For now, use ID + "(DST)" as the name
1138         dstRule = new AnnualTimeZoneRule(tzid+UnicodeString(DST_STR), getRawOffset(), getDSTSavings(),
1139             dtRule, startYear, AnnualTimeZoneRule::MAX_YEAR);
1140
1141         // Check for Null pointer
1142         if (dstRule == NULL) {
1143             status = U_MEMORY_ALLOCATION_ERROR;
1144             deleteTransitionRules();
1145             return;
1146         }
1147
1148         // Calculate the first DST start time
1149         dstRule->getFirstStart(getRawOffset(), 0, firstDstStart);
1150
1151         // Create a TimeZoneRule for standard time
1152         timeRuleType = (endTimeMode == STANDARD_TIME) ? DateTimeRule::STANDARD_TIME :
1153             ((endTimeMode == UTC_TIME) ? DateTimeRule::UTC_TIME : DateTimeRule::WALL_TIME);
1154         switch (endMode) {
1155         case DOM_MODE:
1156             dtRule = new DateTimeRule(endMonth, endDay, endTime, timeRuleType);
1157             break;
1158         case DOW_IN_MONTH_MODE:
1159             dtRule = new DateTimeRule(endMonth, endDay, endDayOfWeek, endTime, timeRuleType);
1160             break;
1161         case DOW_GE_DOM_MODE:
1162             dtRule = new DateTimeRule(endMonth, endDay, endDayOfWeek, true, endTime, timeRuleType);
1163             break;
1164         case DOW_LE_DOM_MODE:
1165             dtRule = new DateTimeRule(endMonth, endDay, endDayOfWeek, false, endTime, timeRuleType);
1166             break;
1167         }
1168
1169         // Check for Null pointer
1170         if (dtRule == NULL) {
1171             status = U_MEMORY_ALLOCATION_ERROR;
1172             deleteTransitionRules();
1173             return;
1174         }
1175         // For now, use ID + "(STD)" as the name
1176         stdRule = new AnnualTimeZoneRule(tzid+UnicodeString(STD_STR), getRawOffset(), 0,
1177             dtRule, startYear, AnnualTimeZoneRule::MAX_YEAR);
1178
1179         //Check for Null pointer
1180         if (stdRule == NULL) {
1181             status = U_MEMORY_ALLOCATION_ERROR;
1182             deleteTransitionRules();
1183             return;
1184         }
1185
1186         // Calculate the first STD start time
1187         stdRule->getFirstStart(getRawOffset(), dstRule->getDSTSavings(), firstStdStart);
1188
1189         // Create a TimeZoneRule for initial time
1190         if (firstStdStart < firstDstStart) {
1191             initialRule = new InitialTimeZoneRule(tzid+UnicodeString(DST_STR), getRawOffset(), dstRule->getDSTSavings());
1192             if (initialRule == NULL) {
1193                 status = U_MEMORY_ALLOCATION_ERROR;
1194                 deleteTransitionRules();
1195                 return;
1196             }
1197             firstTransition = new TimeZoneTransition(firstStdStart, *initialRule, *stdRule);
1198         } else {
1199             initialRule = new InitialTimeZoneRule(tzid+UnicodeString(STD_STR), getRawOffset(), 0);
1200             if (initialRule == NULL) {
1201                 status = U_MEMORY_ALLOCATION_ERROR;
1202                 deleteTransitionRules();
1203                 return;
1204             }
1205             firstTransition = new TimeZoneTransition(firstDstStart, *initialRule, *dstRule);
1206         }
1207         if (firstTransition == NULL) {
1208             status = U_MEMORY_ALLOCATION_ERROR;
1209             deleteTransitionRules();
1210             return;
1211         }
1212
1213     } else {
1214         // Create a TimeZoneRule for initial time
1215         initialRule = new InitialTimeZoneRule(tzid, getRawOffset(), 0);
1216         // Check for null pointer.
1217         if (initialRule == NULL) {
1218             status = U_MEMORY_ALLOCATION_ERROR;
1219             deleteTransitionRules();
1220             return;
1221         }
1222     }
1223
1224     transitionRulesInitialized = TRUE;
1225 }
1226
1227 int32_t
1228 SimpleTimeZone::countTransitionRules(UErrorCode& /*status*/) const {
1229     return (useDaylight) ? 2 : 0;
1230 }
1231
1232 void
1233 SimpleTimeZone::getTimeZoneRules(const InitialTimeZoneRule*& initial,
1234                                  const TimeZoneRule* trsrules[],
1235                                  int32_t& trscount,
1236                                  UErrorCode& status) const {
1237     if (U_FAILURE(status)) {
1238         return;
1239     }
1240     checkTransitionRules(status);
1241     if (U_FAILURE(status)) {
1242         return;
1243     }
1244     initial = initialRule;
1245     int32_t cnt = 0;
1246     if (stdRule != NULL) {
1247         if (cnt < trscount) {
1248             trsrules[cnt++] = stdRule;
1249         }
1250         if (cnt < trscount) {
1251             trsrules[cnt++] = dstRule;
1252         }
1253     }
1254     trscount = cnt;
1255 }
1256
1257
1258 U_NAMESPACE_END
1259
1260 #endif /* #if !UCONFIG_NO_FORMATTING */
1261
1262 //eof