| /* |
| ******************************************************************************* |
| * Copyright (C) 2007-2013, International Business Machines Corporation and |
| * others. All Rights Reserved. |
| ******************************************************************************* |
| */ |
| |
| #include "utypeinfo.h" // for 'typeid' to work |
| |
| #include "unicode/utypes.h" |
| |
| #if !UCONFIG_NO_FORMATTING |
| |
| #include "unicode/rbtz.h" |
| #include "unicode/gregocal.h" |
| #include "uvector.h" |
| #include "gregoimp.h" |
| #include "cmemory.h" |
| #include "umutex.h" |
| |
| U_NAMESPACE_BEGIN |
| |
| /** |
| * A struct representing a time zone transition |
| */ |
| struct Transition { |
| UDate time; |
| TimeZoneRule* from; |
| TimeZoneRule* to; |
| }; |
| |
| static UBool compareRules(UVector* rules1, UVector* rules2) { |
| if (rules1 == NULL && rules2 == NULL) { |
| return TRUE; |
| } else if (rules1 == NULL || rules2 == NULL) { |
| return FALSE; |
| } |
| int32_t size = rules1->size(); |
| if (size != rules2->size()) { |
| return FALSE; |
| } |
| for (int32_t i = 0; i < size; i++) { |
| TimeZoneRule *r1 = (TimeZoneRule*)rules1->elementAt(i); |
| TimeZoneRule *r2 = (TimeZoneRule*)rules2->elementAt(i); |
| if (*r1 != *r2) { |
| return FALSE; |
| } |
| } |
| return TRUE; |
| } |
| |
| UOBJECT_DEFINE_RTTI_IMPLEMENTATION(RuleBasedTimeZone) |
| |
| RuleBasedTimeZone::RuleBasedTimeZone(const UnicodeString& id, InitialTimeZoneRule* initialRule) |
| : BasicTimeZone(id), fInitialRule(initialRule), fHistoricRules(NULL), fFinalRules(NULL), |
| fHistoricTransitions(NULL), fUpToDate(FALSE) { |
| } |
| |
| RuleBasedTimeZone::RuleBasedTimeZone(const RuleBasedTimeZone& source) |
| : BasicTimeZone(source), fInitialRule(source.fInitialRule->clone()), |
| fHistoricTransitions(NULL), fUpToDate(FALSE) { |
| fHistoricRules = copyRules(source.fHistoricRules); |
| fFinalRules = copyRules(source.fFinalRules); |
| if (source.fUpToDate) { |
| UErrorCode status = U_ZERO_ERROR; |
| complete(status); |
| } |
| } |
| |
| RuleBasedTimeZone::~RuleBasedTimeZone() { |
| deleteTransitions(); |
| deleteRules(); |
| } |
| |
| RuleBasedTimeZone& |
| RuleBasedTimeZone::operator=(const RuleBasedTimeZone& right) { |
| if (*this != right) { |
| BasicTimeZone::operator=(right); |
| deleteRules(); |
| fInitialRule = right.fInitialRule->clone(); |
| fHistoricRules = copyRules(right.fHistoricRules); |
| fFinalRules = copyRules(right.fFinalRules); |
| deleteTransitions(); |
| fUpToDate = FALSE; |
| } |
| return *this; |
| } |
| |
| UBool |
| RuleBasedTimeZone::operator==(const TimeZone& that) const { |
| if (this == &that) { |
| return TRUE; |
| } |
| if (typeid(*this) != typeid(that) |
| || BasicTimeZone::operator==(that) == FALSE) { |
| return FALSE; |
| } |
| RuleBasedTimeZone *rbtz = (RuleBasedTimeZone*)&that; |
| if (*fInitialRule != *(rbtz->fInitialRule)) { |
| return FALSE; |
| } |
| if (compareRules(fHistoricRules, rbtz->fHistoricRules) |
| && compareRules(fFinalRules, rbtz->fFinalRules)) { |
| return TRUE; |
| } |
| return FALSE; |
| } |
| |
| UBool |
| RuleBasedTimeZone::operator!=(const TimeZone& that) const { |
| return !operator==(that); |
| } |
| |
| void |
| RuleBasedTimeZone::addTransitionRule(TimeZoneRule* rule, UErrorCode& status) { |
| if (U_FAILURE(status)) { |
| return; |
| } |
| AnnualTimeZoneRule* atzrule = dynamic_cast<AnnualTimeZoneRule*>(rule); |
| if (atzrule != NULL && atzrule->getEndYear() == AnnualTimeZoneRule::MAX_YEAR) { |
| // A final rule |
| if (fFinalRules == NULL) { |
| fFinalRules = new UVector(status); |
| if (U_FAILURE(status)) { |
| return; |
| } |
| } else if (fFinalRules->size() >= 2) { |
| // Cannot handle more than two final rules |
| status = U_INVALID_STATE_ERROR; |
| return; |
| } |
| fFinalRules->addElement((void*)rule, status); |
| } else { |
| // Non-final rule |
| if (fHistoricRules == NULL) { |
| fHistoricRules = new UVector(status); |
| if (U_FAILURE(status)) { |
| return; |
| } |
| } |
| fHistoricRules->addElement((void*)rule, status); |
| } |
| // Mark dirty, so transitions are recalculated at next complete() call |
| fUpToDate = FALSE; |
| } |
| |
| static UMutex gLock = U_MUTEX_INITIALIZER; |
| |
| void |
| RuleBasedTimeZone::completeConst(UErrorCode& status) const { |
| if (U_FAILURE(status)) { |
| return; |
| } |
| umtx_lock(&gLock); |
| if (!fUpToDate) { |
| RuleBasedTimeZone *ncThis = const_cast<RuleBasedTimeZone*>(this); |
| ncThis->complete(status); |
| } |
| umtx_unlock(&gLock); |
| } |
| |
| void |
| RuleBasedTimeZone::complete(UErrorCode& status) { |
| if (U_FAILURE(status)) { |
| return; |
| } |
| if (fUpToDate) { |
| return; |
| } |
| // Make sure either no final rules or a pair of AnnualTimeZoneRules |
| // are available. |
| if (fFinalRules != NULL && fFinalRules->size() != 2) { |
| status = U_INVALID_STATE_ERROR; |
| return; |
| } |
| |
| UBool *done = NULL; |
| // Create a TimezoneTransition and add to the list |
| if (fHistoricRules != NULL || fFinalRules != NULL) { |
| TimeZoneRule *curRule = fInitialRule; |
| UDate lastTransitionTime = MIN_MILLIS; |
| |
| // Build the transition array which represents historical time zone |
| // transitions. |
| if (fHistoricRules != NULL && fHistoricRules->size() > 0) { |
| int32_t i; |
| int32_t historicCount = fHistoricRules->size(); |
| done = (UBool*)uprv_malloc(sizeof(UBool) * historicCount); |
| if (done == NULL) { |
| status = U_MEMORY_ALLOCATION_ERROR; |
| goto cleanup; |
| } |
| for (i = 0; i < historicCount; i++) { |
| done[i] = FALSE; |
| } |
| while (TRUE) { |
| int32_t curStdOffset = curRule->getRawOffset(); |
| int32_t curDstSavings = curRule->getDSTSavings(); |
| UDate nextTransitionTime = MAX_MILLIS; |
| TimeZoneRule *nextRule = NULL; |
| TimeZoneRule *r = NULL; |
| UBool avail; |
| UDate tt; |
| UnicodeString curName, name; |
| curRule->getName(curName); |
| |
| for (i = 0; i < historicCount; i++) { |
| if (done[i]) { |
| continue; |
| } |
| r = (TimeZoneRule*)fHistoricRules->elementAt(i); |
| avail = r->getNextStart(lastTransitionTime, curStdOffset, curDstSavings, false, tt); |
| if (!avail) { |
| // No more transitions from this rule - skip this rule next time |
| done[i] = TRUE; |
| } else { |
| r->getName(name); |
| if (*r == *curRule || |
| (name == curName && r->getRawOffset() == curRule->getRawOffset() |
| && r->getDSTSavings() == curRule->getDSTSavings())) { |
| continue; |
| } |
| if (tt < nextTransitionTime) { |
| nextTransitionTime = tt; |
| nextRule = r; |
| } |
| } |
| } |
| |
| if (nextRule == NULL) { |
| // Check if all historic rules are done |
| UBool bDoneAll = TRUE; |
| for (int32_t j = 0; j < historicCount; j++) { |
| if (!done[j]) { |
| bDoneAll = FALSE; |
| break; |
| } |
| } |
| if (bDoneAll) { |
| break; |
| } |
| } |
| |
| if (fFinalRules != NULL) { |
| // Check if one of final rules has earlier transition date |
| for (i = 0; i < 2 /* fFinalRules->size() */; i++) { |
| TimeZoneRule *fr = (TimeZoneRule*)fFinalRules->elementAt(i); |
| if (*fr == *curRule) { |
| continue; |
| } |
| r = (TimeZoneRule*)fFinalRules->elementAt(i); |
| avail = r->getNextStart(lastTransitionTime, curStdOffset, curDstSavings, false, tt); |
| if (avail) { |
| if (tt < nextTransitionTime) { |
| nextTransitionTime = tt; |
| nextRule = r; |
| } |
| } |
| } |
| } |
| |
| if (nextRule == NULL) { |
| // Nothing more |
| break; |
| } |
| |
| if (fHistoricTransitions == NULL) { |
| fHistoricTransitions = new UVector(status); |
| if (U_FAILURE(status)) { |
| goto cleanup; |
| } |
| } |
| Transition *trst = (Transition*)uprv_malloc(sizeof(Transition)); |
| if (trst == NULL) { |
| status = U_MEMORY_ALLOCATION_ERROR; |
| goto cleanup; |
| } |
| trst->time = nextTransitionTime; |
| trst->from = curRule; |
| trst->to = nextRule; |
| fHistoricTransitions->addElement(trst, status); |
| if (U_FAILURE(status)) { |
| goto cleanup; |
| } |
| lastTransitionTime = nextTransitionTime; |
| curRule = nextRule; |
| } |
| } |
| if (fFinalRules != NULL) { |
| if (fHistoricTransitions == NULL) { |
| fHistoricTransitions = new UVector(status); |
| if (U_FAILURE(status)) { |
| goto cleanup; |
| } |
| } |
| // Append the first transition for each |
| TimeZoneRule *rule0 = (TimeZoneRule*)fFinalRules->elementAt(0); |
| TimeZoneRule *rule1 = (TimeZoneRule*)fFinalRules->elementAt(1); |
| UDate tt0, tt1; |
| UBool avail0 = rule0->getNextStart(lastTransitionTime, curRule->getRawOffset(), curRule->getDSTSavings(), false, tt0); |
| UBool avail1 = rule1->getNextStart(lastTransitionTime, curRule->getRawOffset(), curRule->getDSTSavings(), false, tt1); |
| if (!avail0 || !avail1) { |
| // Should not happen, because both rules are permanent |
| status = U_INVALID_STATE_ERROR; |
| goto cleanup; |
| } |
| Transition *final0 = (Transition*)uprv_malloc(sizeof(Transition)); |
| if (final0 == NULL) { |
| status = U_MEMORY_ALLOCATION_ERROR; |
| goto cleanup; |
| } |
| Transition *final1 = (Transition*)uprv_malloc(sizeof(Transition)); |
| if (final1 == NULL) { |
| uprv_free(final0); |
| status = U_MEMORY_ALLOCATION_ERROR; |
| goto cleanup; |
| } |
| if (tt0 < tt1) { |
| final0->time = tt0; |
| final0->from = curRule; |
| final0->to = rule0; |
| rule1->getNextStart(tt0, rule0->getRawOffset(), rule0->getDSTSavings(), false, final1->time); |
| final1->from = rule0; |
| final1->to = rule1; |
| } else { |
| final0->time = tt1; |
| final0->from = curRule; |
| final0->to = rule1; |
| rule0->getNextStart(tt1, rule1->getRawOffset(), rule1->getDSTSavings(), false, final1->time); |
| final1->from = rule1; |
| final1->to = rule0; |
| } |
| fHistoricTransitions->addElement(final0, status); |
| if (U_FAILURE(status)) { |
| goto cleanup; |
| } |
| fHistoricTransitions->addElement(final1, status); |
| if (U_FAILURE(status)) { |
| goto cleanup; |
| } |
| } |
| } |
| fUpToDate = TRUE; |
| if (done != NULL) { |
| uprv_free(done); |
| } |
| return; |
| |
| cleanup: |
| deleteTransitions(); |
| if (done != NULL) { |
| uprv_free(done); |
| } |
| fUpToDate = FALSE; |
| } |
| |
| TimeZone* |
| RuleBasedTimeZone::clone(void) const { |
| return new RuleBasedTimeZone(*this); |
| } |
| |
| int32_t |
| RuleBasedTimeZone::getOffset(uint8_t era, int32_t year, int32_t month, int32_t day, |
| uint8_t dayOfWeek, int32_t millis, UErrorCode& status) const { |
| if (U_FAILURE(status)) { |
| return 0; |
| } |
| if (month < UCAL_JANUARY || month > UCAL_DECEMBER) { |
| status = U_ILLEGAL_ARGUMENT_ERROR; |
| return 0; |
| } else { |
| return getOffset(era, year, month, day, dayOfWeek, millis, |
| Grego::monthLength(year, month), status); |
| } |
| } |
| |
| int32_t |
| RuleBasedTimeZone::getOffset(uint8_t era, int32_t year, int32_t month, int32_t day, |
| uint8_t /*dayOfWeek*/, int32_t millis, |
| int32_t /*monthLength*/, UErrorCode& status) const { |
| // dayOfWeek and monthLength are unused |
| if (U_FAILURE(status)) { |
| return 0; |
| } |
| if (era == GregorianCalendar::BC) { |
| // Convert to extended year |
| year = 1 - year; |
| } |
| int32_t rawOffset, dstOffset; |
| UDate time = (UDate)Grego::fieldsToDay(year, month, day) * U_MILLIS_PER_DAY + millis; |
| getOffsetInternal(time, TRUE, kDaylight, kStandard, rawOffset, dstOffset, status); |
| if (U_FAILURE(status)) { |
| return 0; |
| } |
| return (rawOffset + dstOffset); |
| } |
| |
| void |
| RuleBasedTimeZone::getOffset(UDate date, UBool local, int32_t& rawOffset, |
| int32_t& dstOffset, UErrorCode& status) const { |
| getOffsetInternal(date, local, kFormer, kLatter, rawOffset, dstOffset, status); |
| } |
| |
| void |
| RuleBasedTimeZone::getOffsetFromLocal(UDate date, int32_t nonExistingTimeOpt, int32_t duplicatedTimeOpt, |
| int32_t& rawOffset, int32_t& dstOffset, UErrorCode& status) const { |
| getOffsetInternal(date, TRUE, nonExistingTimeOpt, duplicatedTimeOpt, rawOffset, dstOffset, status); |
| } |
| |
| |
| /* |
| * The internal getOffset implementation |
| */ |
| void |
| RuleBasedTimeZone::getOffsetInternal(UDate date, UBool local, |
| int32_t NonExistingTimeOpt, int32_t DuplicatedTimeOpt, |
| int32_t& rawOffset, int32_t& dstOffset, |
| UErrorCode& status) const { |
| rawOffset = 0; |
| dstOffset = 0; |
| |
| if (U_FAILURE(status)) { |
| return; |
| } |
| if (!fUpToDate) { |
| // Transitions are not yet resolved. We cannot do it here |
| // because this method is const. Thus, do nothing and return |
| // error status. |
| status = U_INVALID_STATE_ERROR; |
| return; |
| } |
| const TimeZoneRule *rule = NULL; |
| if (fHistoricTransitions == NULL) { |
| rule = fInitialRule; |
| } else { |
| UDate tstart = getTransitionTime((Transition*)fHistoricTransitions->elementAt(0), |
| local, NonExistingTimeOpt, DuplicatedTimeOpt); |
| if (date < tstart) { |
| rule = fInitialRule; |
| } else { |
| int32_t idx = fHistoricTransitions->size() - 1; |
| UDate tend = getTransitionTime((Transition*)fHistoricTransitions->elementAt(idx), |
| local, NonExistingTimeOpt, DuplicatedTimeOpt); |
| if (date > tend) { |
| if (fFinalRules != NULL) { |
| rule = findRuleInFinal(date, local, NonExistingTimeOpt, DuplicatedTimeOpt); |
| } |
| if (rule == NULL) { |
| // no final rules or the given time is before the first transition |
| // specified by the final rules -> use the last rule |
| rule = ((Transition*)fHistoricTransitions->elementAt(idx))->to; |
| } |
| } else { |
| // Find a historical transition |
| while (idx >= 0) { |
| if (date >= getTransitionTime((Transition*)fHistoricTransitions->elementAt(idx), |
| local, NonExistingTimeOpt, DuplicatedTimeOpt)) { |
| break; |
| } |
| idx--; |
| } |
| rule = ((Transition*)fHistoricTransitions->elementAt(idx))->to; |
| } |
| } |
| } |
| if (rule != NULL) { |
| rawOffset = rule->getRawOffset(); |
| dstOffset = rule->getDSTSavings(); |
| } |
| } |
| |
| void |
| RuleBasedTimeZone::setRawOffset(int32_t /*offsetMillis*/) { |
| // We don't support this operation at this moment. |
| // Nothing to do! |
| } |
| |
| int32_t |
| RuleBasedTimeZone::getRawOffset(void) const { |
| // Note: This implementation returns standard GMT offset |
| // as of current time. |
| UErrorCode status = U_ZERO_ERROR; |
| int32_t raw, dst; |
| getOffset(uprv_getUTCtime() * U_MILLIS_PER_SECOND, |
| FALSE, raw, dst, status); |
| return raw; |
| } |
| |
| UBool |
| RuleBasedTimeZone::useDaylightTime(void) const { |
| // Note: This implementation returns true when |
| // daylight saving time is used as of now or |
| // after the next transition. |
| UErrorCode status = U_ZERO_ERROR; |
| UDate now = uprv_getUTCtime() * U_MILLIS_PER_SECOND; |
| int32_t raw, dst; |
| getOffset(now, FALSE, raw, dst, status); |
| if (dst != 0) { |
| return TRUE; |
| } |
| // If DST is not used now, check if DST is used after the next transition |
| UDate time; |
| TimeZoneRule *from, *to; |
| UBool avail = findNext(now, FALSE, time, from, to); |
| if (avail && to->getDSTSavings() != 0) { |
| return TRUE; |
| } |
| return FALSE; |
| } |
| |
| UBool |
| RuleBasedTimeZone::inDaylightTime(UDate date, UErrorCode& status) const { |
| if (U_FAILURE(status)) { |
| return FALSE; |
| } |
| int32_t raw, dst; |
| getOffset(date, FALSE, raw, dst, status); |
| if (dst != 0) { |
| return TRUE; |
| } |
| return FALSE; |
| } |
| |
| UBool |
| RuleBasedTimeZone::hasSameRules(const TimeZone& other) const { |
| if (this == &other) { |
| return TRUE; |
| } |
| if (typeid(*this) != typeid(other)) { |
| return FALSE; |
| } |
| const RuleBasedTimeZone& that = (const RuleBasedTimeZone&)other; |
| if (*fInitialRule != *(that.fInitialRule)) { |
| return FALSE; |
| } |
| if (compareRules(fHistoricRules, that.fHistoricRules) |
| && compareRules(fFinalRules, that.fFinalRules)) { |
| return TRUE; |
| } |
| return FALSE; |
| } |
| |
| UBool |
| RuleBasedTimeZone::getNextTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const { |
| UErrorCode status = U_ZERO_ERROR; |
| completeConst(status); |
| if (U_FAILURE(status)) { |
| return FALSE; |
| } |
| UDate transitionTime; |
| TimeZoneRule *fromRule, *toRule; |
| UBool found = findNext(base, inclusive, transitionTime, fromRule, toRule); |
| if (found) { |
| result.setTime(transitionTime); |
| result.setFrom((const TimeZoneRule&)*fromRule); |
| result.setTo((const TimeZoneRule&)*toRule); |
| return TRUE; |
| } |
| return FALSE; |
| } |
| |
| UBool |
| RuleBasedTimeZone::getPreviousTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const { |
| UErrorCode status = U_ZERO_ERROR; |
| completeConst(status); |
| if (U_FAILURE(status)) { |
| return FALSE; |
| } |
| UDate transitionTime; |
| TimeZoneRule *fromRule, *toRule; |
| UBool found = findPrev(base, inclusive, transitionTime, fromRule, toRule); |
| if (found) { |
| result.setTime(transitionTime); |
| result.setFrom((const TimeZoneRule&)*fromRule); |
| result.setTo((const TimeZoneRule&)*toRule); |
| return TRUE; |
| } |
| return FALSE; |
| } |
| |
| int32_t |
| RuleBasedTimeZone::countTransitionRules(UErrorCode& /*status*/) const { |
| int32_t count = 0; |
| if (fHistoricRules != NULL) { |
| count += fHistoricRules->size(); |
| } |
| if (fFinalRules != NULL) { |
| count += fFinalRules->size(); |
| } |
| return count; |
| } |
| |
| void |
| RuleBasedTimeZone::getTimeZoneRules(const InitialTimeZoneRule*& initial, |
| const TimeZoneRule* trsrules[], |
| int32_t& trscount, |
| UErrorCode& status) const { |
| if (U_FAILURE(status)) { |
| return; |
| } |
| // Initial rule |
| initial = fInitialRule; |
| |
| // Transition rules |
| int32_t cnt = 0; |
| int32_t idx; |
| if (fHistoricRules != NULL && cnt < trscount) { |
| int32_t historicCount = fHistoricRules->size(); |
| idx = 0; |
| while (cnt < trscount && idx < historicCount) { |
| trsrules[cnt++] = (const TimeZoneRule*)fHistoricRules->elementAt(idx++); |
| } |
| } |
| if (fFinalRules != NULL && cnt < trscount) { |
| int32_t finalCount = fFinalRules->size(); |
| idx = 0; |
| while (cnt < trscount && idx < finalCount) { |
| trsrules[cnt++] = (const TimeZoneRule*)fFinalRules->elementAt(idx++); |
| } |
| } |
| // Set the result length |
| trscount = cnt; |
| } |
| |
| void |
| RuleBasedTimeZone::deleteRules(void) { |
| delete fInitialRule; |
| fInitialRule = NULL; |
| if (fHistoricRules != NULL) { |
| while (!fHistoricRules->isEmpty()) { |
| delete (TimeZoneRule*)(fHistoricRules->orphanElementAt(0)); |
| } |
| delete fHistoricRules; |
| fHistoricRules = NULL; |
| } |
| if (fFinalRules != NULL) { |
| while (!fFinalRules->isEmpty()) { |
| delete (AnnualTimeZoneRule*)(fFinalRules->orphanElementAt(0)); |
| } |
| delete fFinalRules; |
| fFinalRules = NULL; |
| } |
| } |
| |
| void |
| RuleBasedTimeZone::deleteTransitions(void) { |
| if (fHistoricTransitions != NULL) { |
| while (!fHistoricTransitions->isEmpty()) { |
| Transition *trs = (Transition*)fHistoricTransitions->orphanElementAt(0); |
| uprv_free(trs); |
| } |
| delete fHistoricTransitions; |
| } |
| fHistoricTransitions = NULL; |
| } |
| |
| UVector* |
| RuleBasedTimeZone::copyRules(UVector* source) { |
| if (source == NULL) { |
| return NULL; |
| } |
| UErrorCode ec = U_ZERO_ERROR; |
| int32_t size = source->size(); |
| UVector *rules = new UVector(size, ec); |
| if (U_FAILURE(ec)) { |
| return NULL; |
| } |
| int32_t i; |
| for (i = 0; i < size; i++) { |
| rules->addElement(((TimeZoneRule*)source->elementAt(i))->clone(), ec); |
| if (U_FAILURE(ec)) { |
| break; |
| } |
| } |
| if (U_FAILURE(ec)) { |
| // In case of error, clean up |
| for (i = 0; i < rules->size(); i++) { |
| TimeZoneRule *rule = (TimeZoneRule*)rules->orphanElementAt(i); |
| delete rule; |
| } |
| delete rules; |
| return NULL; |
| } |
| return rules; |
| } |
| |
| TimeZoneRule* |
| RuleBasedTimeZone::findRuleInFinal(UDate date, UBool local, |
| int32_t NonExistingTimeOpt, int32_t DuplicatedTimeOpt) const { |
| if (fFinalRules == NULL) { |
| return NULL; |
| } |
| |
| AnnualTimeZoneRule* fr0 = (AnnualTimeZoneRule*)fFinalRules->elementAt(0); |
| AnnualTimeZoneRule* fr1 = (AnnualTimeZoneRule*)fFinalRules->elementAt(1); |
| if (fr0 == NULL || fr1 == NULL) { |
| return NULL; |
| } |
| |
| UDate start0, start1; |
| UDate base; |
| int32_t localDelta; |
| |
| base = date; |
| if (local) { |
| localDelta = getLocalDelta(fr1->getRawOffset(), fr1->getDSTSavings(), |
| fr0->getRawOffset(), fr0->getDSTSavings(), |
| NonExistingTimeOpt, DuplicatedTimeOpt); |
| base -= localDelta; |
| } |
| UBool avail0 = fr0->getPreviousStart(base, fr1->getRawOffset(), fr1->getDSTSavings(), TRUE, start0); |
| |
| base = date; |
| if (local) { |
| localDelta = getLocalDelta(fr0->getRawOffset(), fr0->getDSTSavings(), |
| fr1->getRawOffset(), fr1->getDSTSavings(), |
| NonExistingTimeOpt, DuplicatedTimeOpt); |
| base -= localDelta; |
| } |
| UBool avail1 = fr1->getPreviousStart(base, fr0->getRawOffset(), fr0->getDSTSavings(), TRUE, start1); |
| |
| if (!avail0 || !avail1) { |
| if (avail0) { |
| return fr0; |
| } else if (avail1) { |
| return fr1; |
| } |
| // Both rules take effect after the given time |
| return NULL; |
| } |
| |
| return (start0 > start1) ? fr0 : fr1; |
| } |
| |
| UBool |
| RuleBasedTimeZone::findNext(UDate base, UBool inclusive, UDate& transitionTime, |
| TimeZoneRule*& fromRule, TimeZoneRule*& toRule) const { |
| if (fHistoricTransitions == NULL) { |
| return FALSE; |
| } |
| UBool isFinal = FALSE; |
| UBool found = FALSE; |
| Transition result; |
| Transition *tzt = (Transition*)fHistoricTransitions->elementAt(0); |
| UDate tt = tzt->time; |
| if (tt > base || (inclusive && tt == base)) { |
| result = *tzt; |
| found = TRUE; |
| } else { |
| int32_t idx = fHistoricTransitions->size() - 1; |
| tzt = (Transition*)fHistoricTransitions->elementAt(idx); |
| tt = tzt->time; |
| if (inclusive && tt == base) { |
| result = *tzt; |
| found = TRUE; |
| } else if (tt <= base) { |
| if (fFinalRules != NULL) { |
| // Find a transion time with finalRules |
| TimeZoneRule *r0 = (TimeZoneRule*)fFinalRules->elementAt(0); |
| TimeZoneRule *r1 = (TimeZoneRule*)fFinalRules->elementAt(1); |
| UDate start0, start1; |
| UBool avail0 = r0->getNextStart(base, r1->getRawOffset(), r1->getDSTSavings(), inclusive, start0); |
| UBool avail1 = r1->getNextStart(base, r0->getRawOffset(), r0->getDSTSavings(), inclusive, start1); |
| // avail0/avail1 should be always TRUE |
| if (!avail0 && !avail1) { |
| return FALSE; |
| } |
| if (!avail1 || start0 < start1) { |
| result.time = start0; |
| result.from = r1; |
| result.to = r0; |
| } else { |
| result.time = start1; |
| result.from = r0; |
| result.to = r1; |
| } |
| isFinal = TRUE; |
| found = TRUE; |
| } |
| } else { |
| // Find a transition within the historic transitions |
| idx--; |
| Transition *prev = tzt; |
| while (idx > 0) { |
| tzt = (Transition*)fHistoricTransitions->elementAt(idx); |
| tt = tzt->time; |
| if (tt < base || (!inclusive && tt == base)) { |
| break; |
| } |
| idx--; |
| prev = tzt; |
| } |
| result.time = prev->time; |
| result.from = prev->from; |
| result.to = prev->to; |
| found = TRUE; |
| } |
| } |
| if (found) { |
| // For now, this implementation ignore transitions with only zone name changes. |
| if (result.from->getRawOffset() == result.to->getRawOffset() |
| && result.from->getDSTSavings() == result.to->getDSTSavings()) { |
| if (isFinal) { |
| return FALSE; |
| } else { |
| // No offset changes. Try next one if not final |
| return findNext(result.time, FALSE /* always exclusive */, |
| transitionTime, fromRule, toRule); |
| } |
| } |
| transitionTime = result.time; |
| fromRule = result.from; |
| toRule = result.to; |
| return TRUE; |
| } |
| return FALSE; |
| } |
| |
| UBool |
| RuleBasedTimeZone::findPrev(UDate base, UBool inclusive, UDate& transitionTime, |
| TimeZoneRule*& fromRule, TimeZoneRule*& toRule) const { |
| if (fHistoricTransitions == NULL) { |
| return FALSE; |
| } |
| UBool found = FALSE; |
| Transition result; |
| Transition *tzt = (Transition*)fHistoricTransitions->elementAt(0); |
| UDate tt = tzt->time; |
| if (inclusive && tt == base) { |
| result = *tzt; |
| found = TRUE; |
| } else if (tt < base) { |
| int32_t idx = fHistoricTransitions->size() - 1; |
| tzt = (Transition*)fHistoricTransitions->elementAt(idx); |
| tt = tzt->time; |
| if (inclusive && tt == base) { |
| result = *tzt; |
| found = TRUE; |
| } else if (tt < base) { |
| if (fFinalRules != NULL) { |
| // Find a transion time with finalRules |
| TimeZoneRule *r0 = (TimeZoneRule*)fFinalRules->elementAt(0); |
| TimeZoneRule *r1 = (TimeZoneRule*)fFinalRules->elementAt(1); |
| UDate start0, start1; |
| UBool avail0 = r0->getPreviousStart(base, r1->getRawOffset(), r1->getDSTSavings(), inclusive, start0); |
| UBool avail1 = r1->getPreviousStart(base, r0->getRawOffset(), r0->getDSTSavings(), inclusive, start1); |
| // avail0/avail1 should be always TRUE |
| if (!avail0 && !avail1) { |
| return FALSE; |
| } |
| if (!avail1 || start0 > start1) { |
| result.time = start0; |
| result.from = r1; |
| result.to = r0; |
| } else { |
| result.time = start1; |
| result.from = r0; |
| result.to = r1; |
| } |
| } else { |
| result = *tzt; |
| } |
| found = TRUE; |
| } else { |
| // Find a transition within the historic transitions |
| idx--; |
| while (idx >= 0) { |
| tzt = (Transition*)fHistoricTransitions->elementAt(idx); |
| tt = tzt->time; |
| if (tt < base || (inclusive && tt == base)) { |
| break; |
| } |
| idx--; |
| } |
| result = *tzt; |
| found = TRUE; |
| } |
| } |
| if (found) { |
| // For now, this implementation ignore transitions with only zone name changes. |
| if (result.from->getRawOffset() == result.to->getRawOffset() |
| && result.from->getDSTSavings() == result.to->getDSTSavings()) { |
| // No offset changes. Try next one if not final |
| return findPrev(result.time, FALSE /* always exclusive */, |
| transitionTime, fromRule, toRule); |
| } |
| transitionTime = result.time; |
| fromRule = result.from; |
| toRule = result.to; |
| return TRUE; |
| } |
| return FALSE; |
| } |
| |
| UDate |
| RuleBasedTimeZone::getTransitionTime(Transition* transition, UBool local, |
| int32_t NonExistingTimeOpt, int32_t DuplicatedTimeOpt) const { |
| UDate time = transition->time; |
| if (local) { |
| time += getLocalDelta(transition->from->getRawOffset(), transition->from->getDSTSavings(), |
| transition->to->getRawOffset(), transition->to->getDSTSavings(), |
| NonExistingTimeOpt, DuplicatedTimeOpt); |
| } |
| return time; |
| } |
| |
| int32_t |
| RuleBasedTimeZone::getLocalDelta(int32_t rawBefore, int32_t dstBefore, int32_t rawAfter, int32_t dstAfter, |
| int32_t NonExistingTimeOpt, int32_t DuplicatedTimeOpt) const { |
| int32_t delta = 0; |
| |
| int32_t offsetBefore = rawBefore + dstBefore; |
| int32_t offsetAfter = rawAfter + dstAfter; |
| |
| UBool dstToStd = (dstBefore != 0) && (dstAfter == 0); |
| UBool stdToDst = (dstBefore == 0) && (dstAfter != 0); |
| |
| if (offsetAfter - offsetBefore >= 0) { |
| // Positive transition, which makes a non-existing local time range |
| if (((NonExistingTimeOpt & kStdDstMask) == kStandard && dstToStd) |
| || ((NonExistingTimeOpt & kStdDstMask) == kDaylight && stdToDst)) { |
| delta = offsetBefore; |
| } else if (((NonExistingTimeOpt & kStdDstMask) == kStandard && stdToDst) |
| || ((NonExistingTimeOpt & kStdDstMask) == kDaylight && dstToStd)) { |
| delta = offsetAfter; |
| } else if ((NonExistingTimeOpt & kFormerLatterMask) == kLatter) { |
| delta = offsetBefore; |
| } else { |
| // Interprets the time with rule before the transition, |
| // default for non-existing time range |
| delta = offsetAfter; |
| } |
| } else { |
| // Negative transition, which makes a duplicated local time range |
| if (((DuplicatedTimeOpt & kStdDstMask) == kStandard && dstToStd) |
| || ((DuplicatedTimeOpt & kStdDstMask) == kDaylight && stdToDst)) { |
| delta = offsetAfter; |
| } else if (((DuplicatedTimeOpt & kStdDstMask) == kStandard && stdToDst) |
| || ((DuplicatedTimeOpt & kStdDstMask) == kDaylight && dstToStd)) { |
| delta = offsetBefore; |
| } else if ((DuplicatedTimeOpt & kFormerLatterMask) == kFormer) { |
| delta = offsetBefore; |
| } else { |
| // Interprets the time with rule after the transition, |
| // default for duplicated local time range |
| delta = offsetAfter; |
| } |
| } |
| return delta; |
| } |
| |
| U_NAMESPACE_END |
| |
| #endif /* #if !UCONFIG_NO_FORMATTING */ |
| |
| //eof |
| |
