C++ TimeZoneTransition类代码示例

UBool
RuleBasedTimeZone::getPreviousTransition(UDate base, UBool inclusive, TimeZoneTransition& result) /*const*/ {
    UErrorCode status = U_ZERO_ERROR;
    complete(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;
}

UBool
SimpleTimeZone::getNextTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const {
    if (!useDaylight) {
        return FALSE;
    }

    UErrorCode status = U_ZERO_ERROR;
    checkTransitionRules(status);
    if (U_FAILURE(status)) {
        return FALSE;
    }

    UDate firstTransitionTime = firstTransition->getTime();
    if (base < firstTransitionTime || (inclusive && base == firstTransitionTime)) {
        result = *firstTransition;
    }
    UDate stdDate, dstDate;
    UBool stdAvail = stdRule->getNextStart(base, dstRule->getRawOffset(), dstRule->getDSTSavings(), inclusive, stdDate);
    UBool dstAvail = dstRule->getNextStart(base, stdRule->getRawOffset(), stdRule->getDSTSavings(), inclusive, dstDate);
    if (stdAvail && (!dstAvail || stdDate < dstDate)) {
        result.setTime(stdDate);
        result.setFrom((const TimeZoneRule&)*dstRule);
        result.setTo((const TimeZoneRule&)*stdRule);
        return TRUE;
    }
    if (dstAvail && (!stdAvail || dstDate < stdDate)) {
        result.setTime(dstDate);
        result.setFrom((const TimeZoneRule&)*stdRule);
        result.setTo((const TimeZoneRule&)*dstRule);
        return TRUE;
    }
    return FALSE;
}

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;
}

UBool
TimeZoneTransition::operator==(const TimeZoneTransition& that) const {
    if (this == &that) {
        return TRUE;
    }
    if (getDynamicClassID() != that.getDynamicClassID()) {
        return FALSE;
    }
    if (fTime != that.fTime) {
        return FALSE;
    }
    if (fFrom == NULL && that.fFrom == NULL
            || fFrom != NULL && that.fFrom != NULL && *fFrom == *(that.fFrom)) {
        if (fTo == NULL && that.fTo == NULL
                || fTo != NULL && that.fTo != NULL && *fTo == *(that.fTo)) {
            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);
//.........这里部分代码省略.........

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);

//.........这里部分代码省略.........

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) {
//.........这里部分代码省略.........