U_CAPI UBool U_EXPORT2
ucal_getTimeZoneTransitionDate(const UCalendar* cal, UTimeZoneTransitionType type,
UDate* transition, UErrorCode* status)
{
if (U_FAILURE(*status)) {
return FALSE;
}
UDate base = ((Calendar*)cal)->getTime(*status);
const TimeZone& tz = ((Calendar*)cal)->getTimeZone();
const BasicTimeZone * btz = dynamic_cast<const BasicTimeZone *>(&tz);
if (btz != NULL && U_SUCCESS(*status)) {
TimeZoneTransition tzt;
UBool inclusive = (type == UCAL_TZ_TRANSITION_NEXT_INCLUSIVE || type == UCAL_TZ_TRANSITION_PREVIOUS_INCLUSIVE);
UBool result = (type == UCAL_TZ_TRANSITION_NEXT || type == UCAL_TZ_TRANSITION_NEXT_INCLUSIVE)?
btz->getNextTransition(base, inclusive, tzt):
btz->getPreviousTransition(base, inclusive, tzt);
if (result) {
*transition = tzt.getTime();
return TRUE;
}
}
return FALSE;
}
void
BasicTimeZone::getTimeZoneRulesAfter(UDate start, InitialTimeZoneRule*& initial,
UVector*& transitionRules, UErrorCode& status) /*const*/ {
if (U_FAILURE(status)) {
return;
}
const InitialTimeZoneRule *orgini;
const TimeZoneRule **orgtrs = NULL;
TimeZoneTransition tzt;
UBool avail;
UVector *orgRules = NULL;
int32_t ruleCount;
TimeZoneRule *r = NULL;
UBool *done = NULL;
InitialTimeZoneRule *res_initial = NULL;
UVector *filteredRules = NULL;
UnicodeString name;
int32_t i;
UDate time, t;
UDate *newTimes = NULL;
UDate firstStart;
UBool bFinalStd = FALSE, bFinalDst = FALSE;
// Original transition rules
ruleCount = countTransitionRules(status);
if (U_FAILURE(status)) {
return;
}
orgRules = new UVector(ruleCount, status);
if (U_FAILURE(status)) {
return;
}
orgtrs = (const TimeZoneRule**)uprv_malloc(sizeof(TimeZoneRule*)*ruleCount);
if (orgtrs == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
goto error;
}
getTimeZoneRules(orgini, orgtrs, ruleCount, status);
if (U_FAILURE(status)) {
goto error;
}
for (i = 0; i < ruleCount; i++) {
orgRules->addElement(orgtrs[i]->clone(), status);
if (U_FAILURE(status)) {
goto error;
}
}
uprv_free(orgtrs);
orgtrs = NULL;
avail = getPreviousTransition(start, TRUE, tzt);
if (!avail) {
// No need to filter out rules only applicable to time before the start
initial = orgini->clone();
transitionRules = orgRules;
return;
}
done = (UBool*)uprv_malloc(sizeof(UBool)*ruleCount);
if (done == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
goto error;
}
filteredRules = new UVector(status);
if (U_FAILURE(status)) {
goto error;
}
// Create initial rule
tzt.getTo()->getName(name);
res_initial = new InitialTimeZoneRule(name, tzt.getTo()->getRawOffset(),
tzt.getTo()->getDSTSavings());
// Mark rules which does not need to be processed
for (i = 0; i < ruleCount; i++) {
r = (TimeZoneRule*)orgRules->elementAt(i);
avail = r->getNextStart(start, res_initial->getRawOffset(), res_initial->getDSTSavings(), FALSE, time);
done[i] = !avail;
}
time = start;
while (!bFinalStd || !bFinalDst) {
avail = getNextTransition(time, FALSE, tzt);
if (!avail) {
break;
}
UDate updatedTime = tzt.getTime();
if (updatedTime == time) {
// Can get here if rules for start & end of daylight time have exactly
// the same time.
// TODO: fix getNextTransition() to prevent it?
status = U_INVALID_STATE_ERROR;
goto error;
}
time = updatedTime;
const TimeZoneRule *toRule = tzt.getTo();
for (i = 0; i < ruleCount; i++) {
r = (TimeZoneRule*)orgRules->elementAt(i);
if (*r == *toRule) {
break;
}
}
if (i >= ruleCount) {
// This case should never happen
status = U_INVALID_STATE_ERROR;
goto error;
}
if (done[i]) {
continue;
}
const TimeArrayTimeZoneRule *tar = dynamic_cast<const TimeArrayTimeZoneRule *>(toRule);
const AnnualTimeZoneRule *ar;
if (tar != NULL) {
// Get the previous raw offset and DST savings before the very first start time
TimeZoneTransition tzt0;
t = start;
while (TRUE) {
avail = getNextTransition(t, FALSE, tzt0);
if (!avail) {
break;
}
if (*(tzt0.getTo()) == *tar) {
break;
}
t = tzt0.getTime();
}
if (avail) {
// Check if the entire start times to be added
tar->getFirstStart(tzt.getFrom()->getRawOffset(), tzt.getFrom()->getDSTSavings(), firstStart);
if (firstStart > start) {
// Just add the rule as is
filteredRules->addElement(tar->clone(), status);
if (U_FAILURE(status)) {
goto error;
}
} else {
// Colllect transitions after the start time
int32_t startTimes;
DateTimeRule::TimeRuleType timeType;
int32_t idx;
startTimes = tar->countStartTimes();
timeType = tar->getTimeType();
for (idx = 0; idx < startTimes; idx++) {
tar->getStartTimeAt(idx, t);
if (timeType == DateTimeRule::STANDARD_TIME) {
t -= tzt.getFrom()->getRawOffset();
}
if (timeType == DateTimeRule::WALL_TIME) {
t -= tzt.getFrom()->getDSTSavings();
}
if (t > start) {
break;
}
}
int32_t asize = startTimes - idx;
if (asize > 0) {
newTimes = (UDate*)uprv_malloc(sizeof(UDate) * asize);
if (newTimes == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
goto error;
}
for (int32_t newidx = 0; newidx < asize; newidx++) {
tar->getStartTimeAt(idx + newidx, newTimes[newidx]);
if (U_FAILURE(status)) {
uprv_free(newTimes);
newTimes = NULL;
goto error;
}
}
tar->getName(name);
TimeArrayTimeZoneRule *newTar = new TimeArrayTimeZoneRule(name,
tar->getRawOffset(), tar->getDSTSavings(), newTimes, asize, timeType);
uprv_free(newTimes);
filteredRules->addElement(newTar, status);
if (U_FAILURE(status)) {
goto error;
}
}
}
}
} else if ((ar = dynamic_cast<const AnnualTimeZoneRule *>(toRule)) != NULL) {
ar->getFirstStart(tzt.getFrom()->getRawOffset(), tzt.getFrom()->getDSTSavings(), firstStart);
if (firstStart == tzt.getTime()) {
// Just add the rule as is
filteredRules->addElement(ar->clone(), status);
if (U_FAILURE(status)) {
goto error;
}
} else {
// Calculate the transition year
int32_t year, month, dom, dow, doy, mid;
Grego::timeToFields(tzt.getTime(), year, month, dom, dow, doy, mid);
// Re-create the rule
ar->getName(name);
AnnualTimeZoneRule *newAr = new AnnualTimeZoneRule(name, ar->getRawOffset(), ar->getDSTSavings(),
*(ar->getRule()), year, ar->getEndYear());
filteredRules->addElement(newAr, status);
if (U_FAILURE(status)) {
goto error;
}
}
// check if this is a final rule
if (ar->getEndYear() == AnnualTimeZoneRule::MAX_YEAR) {
// After bot final standard and dst rules are processed,
// exit this while loop.
if (ar->getDSTSavings() == 0) {
bFinalStd = TRUE;
} else {
bFinalDst = TRUE;
}
}
}
done[i] = TRUE;
}
// Set the results
if (orgRules != NULL) {
while (!orgRules->isEmpty()) {
r = (TimeZoneRule*)orgRules->orphanElementAt(0);
delete r;
}
delete orgRules;
}
if (done != NULL) {
uprv_free(done);
}
initial = res_initial;
transitionRules = filteredRules;
return;
error:
if (orgtrs != NULL) {
uprv_free(orgtrs);
}
if (orgRules != NULL) {
while (!orgRules->isEmpty()) {
r = (TimeZoneRule*)orgRules->orphanElementAt(0);
delete r;
}
delete orgRules;
}
if (done != NULL) {
if (filteredRules != NULL) {
while (!filteredRules->isEmpty()) {
r = (TimeZoneRule*)filteredRules->orphanElementAt(0);
delete r;
}
delete filteredRules;
}
delete res_initial;
uprv_free(done);
}
initial = NULL;
transitionRules = NULL;
}
void
BasicTimeZone::getSimpleRulesNear(UDate date, InitialTimeZoneRule*& initial,
AnnualTimeZoneRule*& std, AnnualTimeZoneRule*& dst, UErrorCode& status) /*const*/ {
initial = NULL;
std = NULL;
dst = NULL;
if (U_FAILURE(status)) {
return;
}
int32_t initialRaw, initialDst;
UnicodeString initialName;
AnnualTimeZoneRule *ar1 = NULL;
AnnualTimeZoneRule *ar2 = NULL;
UnicodeString name;
UBool avail;
TimeZoneTransition tr;
// Get the next transition
avail = getNextTransition(date, FALSE, tr);
if (avail) {
tr.getFrom()->getName(initialName);
initialRaw = tr.getFrom()->getRawOffset();
initialDst = tr.getFrom()->getDSTSavings();
// Check if the next transition is either DST->STD or STD->DST and
// within roughly 1 year from the specified date
UDate nextTransitionTime = tr.getTime();
if (((tr.getFrom()->getDSTSavings() == 0 && tr.getTo()->getDSTSavings() != 0)
|| (tr.getFrom()->getDSTSavings() != 0 && tr.getTo()->getDSTSavings() == 0))
&& (date + MILLIS_PER_YEAR > nextTransitionTime)) {
int32_t year, month, dom, dow, doy, mid;
UDate d;
// Get local wall time for the next transition time
Grego::timeToFields(nextTransitionTime + initialRaw + initialDst,
year, month, dom, dow, doy, mid);
int32_t weekInMonth = Grego::dayOfWeekInMonth(year, month, dom);
// Create DOW rule
DateTimeRule *dtr = new DateTimeRule(month, weekInMonth, dow, mid, DateTimeRule::WALL_TIME);
tr.getTo()->getName(name);
// Note: SimpleTimeZone does not support raw offset change.
// So we always use raw offset of the given time for the rule,
// even raw offset is changed. This will result that the result
// zone to return wrong offset after the transition.
// When we encounter such case, we do not inspect next next
// transition for another rule.
ar1 = new AnnualTimeZoneRule(name, initialRaw, tr.getTo()->getDSTSavings(),
dtr, year, AnnualTimeZoneRule::MAX_YEAR);
if (tr.getTo()->getRawOffset() == initialRaw) {
// Get the next next transition
avail = getNextTransition(nextTransitionTime, FALSE, tr);
if (avail) {
// Check if the next next transition is either DST->STD or STD->DST
// and within roughly 1 year from the next transition
if (((tr.getFrom()->getDSTSavings() == 0 && tr.getTo()->getDSTSavings() != 0)
|| (tr.getFrom()->getDSTSavings() != 0 && tr.getTo()->getDSTSavings() == 0))
&& nextTransitionTime + MILLIS_PER_YEAR > tr.getTime()) {
// Get local wall time for the next transition time
Grego::timeToFields(tr.getTime() + tr.getFrom()->getRawOffset() + tr.getFrom()->getDSTSavings(),
year, month, dom, dow, doy, mid);
weekInMonth = Grego::dayOfWeekInMonth(year, month, dom);
// Generate another DOW rule
dtr = new DateTimeRule(month, weekInMonth, dow, mid, DateTimeRule::WALL_TIME);
tr.getTo()->getName(name);
ar2 = new AnnualTimeZoneRule(name, tr.getTo()->getRawOffset(), tr.getTo()->getDSTSavings(),
dtr, year - 1, AnnualTimeZoneRule::MAX_YEAR);
// Make sure this rule can be applied to the specified date
avail = ar2->getPreviousStart(date, tr.getFrom()->getRawOffset(), tr.getFrom()->getDSTSavings(), TRUE, d);
if (!avail || d > date
|| initialRaw != tr.getTo()->getRawOffset()
|| initialDst != tr.getTo()->getDSTSavings()) {
// We cannot use this rule as the second transition rule
delete ar2;
ar2 = NULL;
}
}
}
}
if (ar2 == NULL) {
// Try previous transition
avail = getPreviousTransition(date, TRUE, tr);
if (avail) {
// Check if the previous transition is either DST->STD or STD->DST.
// The actual transition time does not matter here.
if ((tr.getFrom()->getDSTSavings() == 0 && tr.getTo()->getDSTSavings() != 0)
|| (tr.getFrom()->getDSTSavings() != 0 && tr.getTo()->getDSTSavings() == 0)) {
// Generate another DOW rule
Grego::timeToFields(tr.getTime() + tr.getFrom()->getRawOffset() + tr.getFrom()->getDSTSavings(),
year, month, dom, dow, doy, mid);
weekInMonth = Grego::dayOfWeekInMonth(year, month, dom);
dtr = new DateTimeRule(month, weekInMonth, dow, mid, DateTimeRule::WALL_TIME);
tr.getTo()->getName(name);
// second rule raw/dst offsets should match raw/dst offsets
// at the given time
ar2 = new AnnualTimeZoneRule(name, initialRaw, initialDst,
dtr, ar1->getStartYear() - 1, AnnualTimeZoneRule::MAX_YEAR);
// Check if this rule start after the first rule after the specified date
avail = ar2->getNextStart(date, tr.getFrom()->getRawOffset(), tr.getFrom()->getDSTSavings(), FALSE, d);
if (!avail || d <= nextTransitionTime) {
// We cannot use this rule as the second transition rule
delete ar2;
ar2 = NULL;
}
}
}
}
if (ar2 == NULL) {
// Cannot find a good pair of AnnualTimeZoneRule
delete ar1;
ar1 = NULL;
} else {
// The initial rule should represent the rule before the previous transition
ar1->getName(initialName);
initialRaw = ar1->getRawOffset();
initialDst = ar1->getDSTSavings();
}
}
}
else {
// Try the previous one
avail = getPreviousTransition(date, TRUE, tr);
if (avail) {
tr.getTo()->getName(initialName);
initialRaw = tr.getTo()->getRawOffset();
initialDst = tr.getTo()->getDSTSavings();
} else {
// No transitions in the past. Just use the current offsets
getOffset(date, FALSE, initialRaw, initialDst, status);
if (U_FAILURE(status)) {
return;
}
}
}
// Set the initial rule
initial = new InitialTimeZoneRule(initialName, initialRaw, initialDst);
// Set the standard and daylight saving rules
if (ar1 != NULL && ar2 != NULL) {
if (ar1->getDSTSavings() != 0) {
dst = ar1;
std = ar2;
} else {
std = ar1;
dst = ar2;
}
}
}
UnicodeString&
TZGNCore::formatGenericNonLocationName(const TimeZone& tz, UTimeZoneGenericNameType type, UDate date, UnicodeString& name) const {
U_ASSERT(type == UTZGNM_LONG || type == UTZGNM_SHORT);
name.setToBogus();
const UChar* uID = ZoneMeta::getCanonicalCLDRID(tz);
if (uID == NULL) {
return name;
}
UnicodeString tzID(TRUE, uID, -1);
// Try to get a name from time zone first
UTimeZoneNameType nameType = (type == UTZGNM_LONG) ? UTZNM_LONG_GENERIC : UTZNM_SHORT_GENERIC;
fTimeZoneNames->getTimeZoneDisplayName(tzID, nameType, name);
if (!name.isEmpty()) {
return name;
}
// Try meta zone
UChar mzIDBuf[32];
UnicodeString mzID(mzIDBuf, 0, UPRV_LENGTHOF(mzIDBuf));
fTimeZoneNames->getMetaZoneID(tzID, date, mzID);
if (!mzID.isEmpty()) {
UErrorCode status = U_ZERO_ERROR;
UBool useStandard = FALSE;
int32_t raw, sav;
UChar tmpNameBuf[64];
tz.getOffset(date, FALSE, raw, sav, status);
if (U_FAILURE(status)) {
return name;
}
if (sav == 0) {
useStandard = TRUE;
TimeZone *tmptz = tz.clone();
// Check if the zone actually uses daylight saving time around the time
BasicTimeZone *btz = NULL;
if (dynamic_cast<OlsonTimeZone *>(tmptz) != NULL
|| dynamic_cast<SimpleTimeZone *>(tmptz) != NULL
|| dynamic_cast<RuleBasedTimeZone *>(tmptz) != NULL
|| dynamic_cast<VTimeZone *>(tmptz) != NULL) {
btz = (BasicTimeZone*)tmptz;
}
if (btz != NULL) {
TimeZoneTransition before;
UBool beforTrs = btz->getPreviousTransition(date, TRUE, before);
if (beforTrs
&& (date - before.getTime() < kDstCheckRange)
&& before.getFrom()->getDSTSavings() != 0) {
useStandard = FALSE;
} else {
TimeZoneTransition after;
UBool afterTrs = btz->getNextTransition(date, FALSE, after);
if (afterTrs
&& (after.getTime() - date < kDstCheckRange)
&& after.getTo()->getDSTSavings() != 0) {
useStandard = FALSE;
}
}
} else {
// If not BasicTimeZone... only if the instance is not an ICU's implementation.
// We may get a wrong answer in edge case, but it should practically work OK.
tmptz->getOffset(date - kDstCheckRange, FALSE, raw, sav, status);
if (sav != 0) {
useStandard = FALSE;
} else {
tmptz->getOffset(date + kDstCheckRange, FALSE, raw, sav, status);
if (sav != 0){
useStandard = FALSE;
}
}
if (U_FAILURE(status)) {
delete tmptz;
return name;
}
}
delete tmptz;
}
if (useStandard) {
UTimeZoneNameType stdNameType = (nameType == UTZNM_LONG_GENERIC)
? UTZNM_LONG_STANDARD : UTZNM_SHORT_STANDARD;
UnicodeString stdName(tmpNameBuf, 0, UPRV_LENGTHOF(tmpNameBuf));
fTimeZoneNames->getDisplayName(tzID, stdNameType, date, stdName);
if (!stdName.isEmpty()) {
name.setTo(stdName);
// TODO: revisit this issue later
// In CLDR, a same display name is used for both generic and standard
// for some meta zones in some locales. This looks like a data bugs.
// For now, we check if the standard name is different from its generic
// name below.
UChar genNameBuf[64];
UnicodeString mzGenericName(genNameBuf, 0, UPRV_LENGTHOF(genNameBuf));
fTimeZoneNames->getMetaZoneDisplayName(mzID, nameType, mzGenericName);
if (stdName.caseCompare(mzGenericName, 0) == 0) {
name.setToBogus();
}
}
}
if (name.isEmpty()) {
// Get a name from meta zone
UnicodeString mzName(tmpNameBuf, 0, UPRV_LENGTHOF(tmpNameBuf));
fTimeZoneNames->getMetaZoneDisplayName(mzID, nameType, mzName);
if (!mzName.isEmpty()) {
// Check if we need to use a partial location format.
// This check is done by comparing offset with the meta zone's
// golden zone at the given date.
UChar idBuf[32];
UnicodeString goldenID(idBuf, 0, UPRV_LENGTHOF(idBuf));
fTimeZoneNames->getReferenceZoneID(mzID, fTargetRegion, goldenID);
if (!goldenID.isEmpty() && goldenID != tzID) {
TimeZone *goldenZone = TimeZone::createTimeZone(goldenID);
int32_t raw1, sav1;
// Check offset in the golden zone with wall time.
// With getOffset(date, false, offsets1),
// you may get incorrect results because of time overlap at DST->STD
// transition.
goldenZone->getOffset(date + raw + sav, TRUE, raw1, sav1, status);
delete goldenZone;
if (U_SUCCESS(status)) {
if (raw != raw1 || sav != sav1) {
// Now we need to use a partial location format
getPartialLocationName(tzID, mzID, (nameType == UTZNM_LONG_GENERIC), mzName, name);
} else {
name.setTo(mzName);
}
}
} else {
name.setTo(mzName);
}
}
}
}
return name;
}