UBool
BasicTimeZone::hasEquivalentTransitions(/*const*/ BasicTimeZone& tz, UDate start, UDate end,
UBool ignoreDstAmount, UErrorCode& status) /*const*/ {
if (U_FAILURE(status)) {
return FALSE;
}
if (hasSameRules(tz)) {
return TRUE;
}
// Check the offsets at the start time
int32_t raw1, raw2, dst1, dst2;
getOffset(start, FALSE, raw1, dst1, status);
if (U_FAILURE(status)) {
return FALSE;
}
tz.getOffset(start, FALSE, raw2, dst2, status);
if (U_FAILURE(status)) {
return FALSE;
}
if (ignoreDstAmount) {
if ((raw1 + dst1 != raw2 + dst2)
|| (dst1 != 0 && dst2 == 0)
|| (dst1 == 0 && dst2 != 0)) {
return FALSE;
}
} else {
if (raw1 != raw2 || dst1 != dst2) {
return FALSE;
}
}
// Check transitions in the range
UDate time = start;
TimeZoneTransition tr1, tr2;
while (TRUE) {
UBool avail1 = getNextTransition(time, FALSE, tr1);
UBool avail2 = tz.getNextTransition(time, FALSE, tr2);
if (ignoreDstAmount) {
// Skip a transition which only differ the amount of DST savings
while (TRUE) {
if (avail1
&& tr1.getTime() <= end
&& (tr1.getFrom()->getRawOffset() + tr1.getFrom()->getDSTSavings()
== tr1.getTo()->getRawOffset() + tr1.getTo()->getDSTSavings())
&& (tr1.getFrom()->getDSTSavings() != 0 && tr1.getTo()->getDSTSavings() != 0)) {
getNextTransition(tr1.getTime(), FALSE, tr1);
} else {
break;
}
}
while (TRUE) {
if (avail2
&& tr2.getTime() <= end
&& (tr2.getFrom()->getRawOffset() + tr2.getFrom()->getDSTSavings()
== tr2.getTo()->getRawOffset() + tr2.getTo()->getDSTSavings())
&& (tr2.getFrom()->getDSTSavings() != 0 && tr2.getTo()->getDSTSavings() != 0)) {
tz.getNextTransition(tr2.getTime(), FALSE, tr2);
} else {
break;
}
}
}
UBool inRange1 = (avail1 && tr1.getTime() <= end);
UBool inRange2 = (avail2 && tr2.getTime() <= end);
if (!inRange1 && !inRange2) {
// No more transition in the range
break;
}
if (!inRange1 || !inRange2) {
return FALSE;
}
if (tr1.getTime() != tr2.getTime()) {
return FALSE;
}
if (ignoreDstAmount) {
if (tr1.getTo()->getRawOffset() + tr1.getTo()->getDSTSavings()
!= tr2.getTo()->getRawOffset() + tr2.getTo()->getDSTSavings()
|| (tr1.getTo()->getDSTSavings() != 0 && tr2.getTo()->getDSTSavings() == 0)
|| (tr1.getTo()->getDSTSavings() == 0 && tr2.getTo()->getDSTSavings() != 0)) {
return FALSE;
}
} else {
if (tr1.getTo()->getRawOffset() != tr2.getTo()->getRawOffset() ||
tr1.getTo()->getDSTSavings() != tr2.getTo()->getDSTSavings()) {
return FALSE;
}
}
time = tr1.getTime();
}
return TRUE;
}
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;
}