[apple/icu.git] / icuSources / i18n / basictz.cpp

/*
*******************************************************************************
* Copyright (C) 2007-2013, International Business Machines Corporation and
* others. All Rights Reserved.
*******************************************************************************
*/

#include "unicode/utypes.h"

#if !UCONFIG_NO_FORMATTING

#include "unicode/basictz.h"
#include "gregoimp.h"
#include "uvector.h"
#include "cmemory.h"

U_NAMESPACE_BEGIN

#define MILLIS_PER_YEAR (365*24*60*60*1000.0)

BasicTimeZone::BasicTimeZone()
: TimeZone() {
}

BasicTimeZone::BasicTimeZone(const UnicodeString &id)
: TimeZone(id) {
}

BasicTimeZone::BasicTimeZone(const BasicTimeZone& source)
: TimeZone(source) {
}

BasicTimeZone::~BasicTimeZone() {
}

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;
}

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;
        }
    }
}

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::getOffsetFromLocal(UDate /*date*/, int32_t /*nonExistingTimeOpt*/, int32_t /*duplicatedTimeOpt*/,
                            int32_t& /*rawOffset*/, int32_t& /*dstOffset*/, UErrorCode& status) const {
    if (U_FAILURE(status)) {
        return;
    }
    status = U_UNSUPPORTED_ERROR;
}

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_FORMATTING */

//eof
Commit	Line	Data
46f4442e A	1	/*
46f4442e A	2	*******************************************************************************
51004dcb	3	* Copyright (C) 2007-2013, International Business Machines Corporation and
729e4ab9	4	* others. All Rights Reserved.
46f4442e A	5	*******************************************************************************
	6	*/
	7
	8	#include "unicode/utypes.h"
	9
	10	#if !UCONFIG_NO_FORMATTING
	11
	12	#include "unicode/basictz.h"
	13	#include "gregoimp.h"
	14	#include "uvector.h"
	15	#include "cmemory.h"
	16
	17	U_NAMESPACE_BEGIN
	18
	19	#define MILLIS_PER_YEAR (3652460601000.0)
	20
	21	BasicTimeZone::BasicTimeZone()
	22	: TimeZone() {
	23	}
	24
	25	BasicTimeZone::BasicTimeZone(const UnicodeString &id)
	26	: TimeZone(id) {
	27	}
	28
	29	BasicTimeZone::BasicTimeZone(const BasicTimeZone& source)
	30	: TimeZone(source) {
	31	}
	32
	33	BasicTimeZone::~BasicTimeZone() {
	34	}
	35
	36	UBool
51004dcb A	37	BasicTimeZone::hasEquivalentTransitions(const BasicTimeZone& tz, UDate start, UDate end,
51004dcb A	38	UBool ignoreDstAmount, UErrorCode& status) const {
46f4442e A	39	if (U_FAILURE(status)) {
	40	return FALSE;
	41	}
	42	if (hasSameRules(tz)) {
	43	return TRUE;
	44	}
	45	// Check the offsets at the start time
	46	int32_t raw1, raw2, dst1, dst2;
	47	getOffset(start, FALSE, raw1, dst1, status);
	48	if (U_FAILURE(status)) {
	49	return FALSE;
	50	}
	51	tz.getOffset(start, FALSE, raw2, dst2, status);
	52	if (U_FAILURE(status)) {
	53	return FALSE;
	54	}
	55	if (ignoreDstAmount) {
	56	if ((raw1 + dst1 != raw2 + dst2)
	57	\|\| (dst1 != 0 && dst2 == 0)
	58	\|\| (dst1 == 0 && dst2 != 0)) {
	59	return FALSE;
	60	}
	61	} else {
	62	if (raw1 != raw2 \|\| dst1 != dst2) {
	63	return FALSE;
	64	}
	65	}
	66	// Check transitions in the range
	67	UDate time = start;
	68	TimeZoneTransition tr1, tr2;
	69	while (TRUE) {
	70	UBool avail1 = getNextTransition(time, FALSE, tr1);
	71	UBool avail2 = tz.getNextTransition(time, FALSE, tr2);
	72
	73	if (ignoreDstAmount) {
	74	// Skip a transition which only differ the amount of DST savings
729e4ab9 A	75	while (TRUE) {
	76	if (avail1
	77	&& tr1.getTime() <= end
	78	&& (tr1.getFrom()->getRawOffset() + tr1.getFrom()->getDSTSavings()
	79	== tr1.getTo()->getRawOffset() + tr1.getTo()->getDSTSavings())
	80	&& (tr1.getFrom()->getDSTSavings() != 0 && tr1.getTo()->getDSTSavings() != 0)) {
	81	getNextTransition(tr1.getTime(), FALSE, tr1);
	82	} else {
	83	break;
	84	}
46f4442e	85	}
729e4ab9 A	86	while (TRUE) {
	87	if (avail2
	88	&& tr2.getTime() <= end
	89	&& (tr2.getFrom()->getRawOffset() + tr2.getFrom()->getDSTSavings()
	90	== tr2.getTo()->getRawOffset() + tr2.getTo()->getDSTSavings())
	91	&& (tr2.getFrom()->getDSTSavings() != 0 && tr2.getTo()->getDSTSavings() != 0)) {
	92	tz.getNextTransition(tr2.getTime(), FALSE, tr2);
	93	} else {
	94	break;
	95	}
46f4442e A	96	}
	97	}
	98
	99	UBool inRange1 = (avail1 && tr1.getTime() <= end);
	100	UBool inRange2 = (avail2 && tr2.getTime() <= end);
	101	if (!inRange1 && !inRange2) {
	102	// No more transition in the range
	103	break;
	104	}
	105	if (!inRange1 \|\| !inRange2) {
	106	return FALSE;
	107	}
	108	if (tr1.getTime() != tr2.getTime()) {
	109	return FALSE;
	110	}
	111	if (ignoreDstAmount) {
	112	if (tr1.getTo()->getRawOffset() + tr1.getTo()->getDSTSavings()
	113	!= tr2.getTo()->getRawOffset() + tr2.getTo()->getDSTSavings()
729e4ab9 A	114	\|\| (tr1.getTo()->getDSTSavings() != 0 && tr2.getTo()->getDSTSavings() == 0)
729e4ab9 A	115	\|\| (tr1.getTo()->getDSTSavings() == 0 && tr2.getTo()->getDSTSavings() != 0)) {
46f4442e A	116	return FALSE;
	117	}
	118	} else {
	119	if (tr1.getTo()->getRawOffset() != tr2.getTo()->getRawOffset() \|\|
	120	tr1.getTo()->getDSTSavings() != tr2.getTo()->getDSTSavings()) {
	121	return FALSE;
	122	}
	123	}
	124	time = tr1.getTime();
	125	}
	126	return TRUE;
	127	}
	128
	129	void
	130	BasicTimeZone::getSimpleRulesNear(UDate date, InitialTimeZoneRule*& initial,
51004dcb	131	AnnualTimeZoneRule& std, AnnualTimeZoneRule& dst, UErrorCode& status) const {
46f4442e A	132	initial = NULL;
	133	std = NULL;
	134	dst = NULL;
	135	if (U_FAILURE(status)) {
	136	return;
	137	}
	138	int32_t initialRaw, initialDst;
	139	UnicodeString initialName;
	140
	141	AnnualTimeZoneRule *ar1 = NULL;
	142	AnnualTimeZoneRule *ar2 = NULL;
	143	UnicodeString name;
	144
	145	UBool avail;
	146	TimeZoneTransition tr;
	147	// Get the next transition
	148	avail = getNextTransition(date, FALSE, tr);
	149	if (avail) {
	150	tr.getFrom()->getName(initialName);
	151	initialRaw = tr.getFrom()->getRawOffset();
	152	initialDst = tr.getFrom()->getDSTSavings();
	153
	154	// Check if the next transition is either DST->STD or STD->DST and
	155	// within roughly 1 year from the specified date
	156	UDate nextTransitionTime = tr.getTime();
	157	if (((tr.getFrom()->getDSTSavings() == 0 && tr.getTo()->getDSTSavings() != 0)
	158	\|\| (tr.getFrom()->getDSTSavings() != 0 && tr.getTo()->getDSTSavings() == 0))
	159	&& (date + MILLIS_PER_YEAR > nextTransitionTime)) {
	160
	161	int32_t year, month, dom, dow, doy, mid;
	162	UDate d;
	163
	164	// Get local wall time for the next transition time
	165	Grego::timeToFields(nextTransitionTime + initialRaw + initialDst,
	166	year, month, dom, dow, doy, mid);
	167	int32_t weekInMonth = Grego::dayOfWeekInMonth(year, month, dom);
	168	// Create DOW rule
	169	DateTimeRule *dtr = new DateTimeRule(month, weekInMonth, dow, mid, DateTimeRule::WALL_TIME);
	170	tr.getTo()->getName(name);
729e4ab9 A	171
	172	// Note: SimpleTimeZone does not support raw offset change.
	173	// So we always use raw offset of the given time for the rule,
	174	// even raw offset is changed. This will result that the result
	175	// zone to return wrong offset after the transition.
	176	// When we encounter such case, we do not inspect next next
	177	// transition for another rule.
	178	ar1 = new AnnualTimeZoneRule(name, initialRaw, tr.getTo()->getDSTSavings(),
46f4442e A	179	dtr, year, AnnualTimeZoneRule::MAX_YEAR);
46f4442e A	180
729e4ab9 A	181	if (tr.getTo()->getRawOffset() == initialRaw) {
	182	// Get the next next transition
	183	avail = getNextTransition(nextTransitionTime, FALSE, tr);
	184	if (avail) {
	185	// Check if the next next transition is either DST->STD or STD->DST
	186	// and within roughly 1 year from the next transition
	187	if (((tr.getFrom()->getDSTSavings() == 0 && tr.getTo()->getDSTSavings() != 0)
	188	\|\| (tr.getFrom()->getDSTSavings() != 0 && tr.getTo()->getDSTSavings() == 0))
	189	&& nextTransitionTime + MILLIS_PER_YEAR > tr.getTime()) {
	190
	191	// Get local wall time for the next transition time
	192	Grego::timeToFields(tr.getTime() + tr.getFrom()->getRawOffset() + tr.getFrom()->getDSTSavings(),
	193	year, month, dom, dow, doy, mid);
	194	weekInMonth = Grego::dayOfWeekInMonth(year, month, dom);
	195	// Generate another DOW rule
	196	dtr = new DateTimeRule(month, weekInMonth, dow, mid, DateTimeRule::WALL_TIME);
	197	tr.getTo()->getName(name);
	198	ar2 = new AnnualTimeZoneRule(name, tr.getTo()->getRawOffset(), tr.getTo()->getDSTSavings(),
	199	dtr, year - 1, AnnualTimeZoneRule::MAX_YEAR);
	200
	201	// Make sure this rule can be applied to the specified date
	202	avail = ar2->getPreviousStart(date, tr.getFrom()->getRawOffset(), tr.getFrom()->getDSTSavings(), TRUE, d);
	203	if (!avail \|\| d > date
	204	\|\| initialRaw != tr.getTo()->getRawOffset()
	205	\|\| initialDst != tr.getTo()->getDSTSavings()) {
	206	// We cannot use this rule as the second transition rule
	207	delete ar2;
	208	ar2 = NULL;
	209	}
46f4442e A	210	}
	211	}
	212	}
	213	if (ar2 == NULL) {
	214	// Try previous transition
	215	avail = getPreviousTransition(date, TRUE, tr);
	216	if (avail) {
	217	// Check if the previous transition is either DST->STD or STD->DST.
	218	// The actual transition time does not matter here.
	219	if ((tr.getFrom()->getDSTSavings() == 0 && tr.getTo()->getDSTSavings() != 0)
	220	\|\| (tr.getFrom()->getDSTSavings() != 0 && tr.getTo()->getDSTSavings() == 0)) {
	221
	222	// Generate another DOW rule
	223	Grego::timeToFields(tr.getTime() + tr.getFrom()->getRawOffset() + tr.getFrom()->getDSTSavings(),
	224	year, month, dom, dow, doy, mid);
	225	weekInMonth = Grego::dayOfWeekInMonth(year, month, dom);
	226	dtr = new DateTimeRule(month, weekInMonth, dow, mid, DateTimeRule::WALL_TIME);
	227	tr.getTo()->getName(name);
729e4ab9 A	228
	229	// second rule raw/dst offsets should match raw/dst offsets
	230	// at the given time
	231	ar2 = new AnnualTimeZoneRule(name, initialRaw, initialDst,
46f4442e A	232	dtr, ar1->getStartYear() - 1, AnnualTimeZoneRule::MAX_YEAR);
	233
	234	// Check if this rule start after the first rule after the specified date
	235	avail = ar2->getNextStart(date, tr.getFrom()->getRawOffset(), tr.getFrom()->getDSTSavings(), FALSE, d);
	236	if (!avail \|\| d <= nextTransitionTime) {
	237	// We cannot use this rule as the second transition rule
	238	delete ar2;
	239	ar2 = NULL;
	240	}
	241	}
	242	}
	243	}
	244	if (ar2 == NULL) {
	245	// Cannot find a good pair of AnnualTimeZoneRule
	246	delete ar1;
	247	ar1 = NULL;
	248	} else {
	249	// The initial rule should represent the rule before the previous transition
	250	ar1->getName(initialName);
	251	initialRaw = ar1->getRawOffset();
	252	initialDst = ar1->getDSTSavings();
	253	}
	254	}
	255	}
	256	else {
	257	// Try the previous one
	258	avail = getPreviousTransition(date, TRUE, tr);
	259	if (avail) {
	260	tr.getTo()->getName(initialName);
	261	initialRaw = tr.getTo()->getRawOffset();
	262	initialDst = tr.getTo()->getDSTSavings();
	263	} else {
	264	// No transitions in the past. Just use the current offsets
	265	getOffset(date, FALSE, initialRaw, initialDst, status);
	266	if (U_FAILURE(status)) {
	267	return;
	268	}
	269	}
	270	}
	271	// Set the initial rule
	272	initial = new InitialTimeZoneRule(initialName, initialRaw, initialDst);
	273
	274	// Set the standard and daylight saving rules
	275	if (ar1 != NULL && ar2 != NULL) {
	276	if (ar1->getDSTSavings() != 0) {
	277	dst = ar1;
	278	std = ar2;
	279	} else {
	280	std = ar1;
	281	dst = ar2;
	282	}
	283	}
	284	}
	285
	286	void
	287	BasicTimeZone::getTimeZoneRulesAfter(UDate start, InitialTimeZoneRule*& initial,
51004dcb	288	UVector*& transitionRules, UErrorCode& status) const {
46f4442e A	289	if (U_FAILURE(status)) {
	290	return;
	291	}
	292
	293	const InitialTimeZoneRule *orgini;
	294	const TimeZoneRule **orgtrs = NULL;
	295	TimeZoneTransition tzt;
	296	UBool avail;
	297	UVector *orgRules = NULL;
	298	int32_t ruleCount;
	299	TimeZoneRule *r = NULL;
	300	UBool *done = NULL;
	301	InitialTimeZoneRule *res_initial = NULL;
	302	UVector *filteredRules = NULL;
	303	UnicodeString name;
	304	int32_t i;
	305	UDate time, t;
	306	UDate *newTimes = NULL;
	307	UDate firstStart;
	308	UBool bFinalStd = FALSE, bFinalDst = FALSE;
	309
	310	// Original transition rules
	311	ruleCount = countTransitionRules(status);
	312	if (U_FAILURE(status)) {
	313	return;
	314	}
	315	orgRules = new UVector(ruleCount, status);
	316	if (U_FAILURE(status)) {
	317	return;
	318	}
	319	orgtrs = (const TimeZoneRule*)uprv_malloc(sizeof(TimeZoneRule)*ruleCount);
	320	if (orgtrs == NULL) {
	321	status = U_MEMORY_ALLOCATION_ERROR;
	322	goto error;
	323	}
	324	getTimeZoneRules(orgini, orgtrs, ruleCount, status);
	325	if (U_FAILURE(status)) {
	326	goto error;
	327	}
	328	for (i = 0; i < ruleCount; i++) {
	329	orgRules->addElement(orgtrs[i]->clone(), status);
	330	if (U_FAILURE(status)) {
	331	goto error;
	332	}
	333	}
	334	uprv_free(orgtrs);
	335	orgtrs = NULL;
	336
	337	avail = getPreviousTransition(start, TRUE, tzt);
	338	if (!avail) {
	339	// No need to filter out rules only applicable to time before the start
	340	initial = orgini->clone();
	341	transitionRules = orgRules;
	342	return;
	343	}
	344
	345	done = (UBool)uprv_malloc(sizeof(UBool)ruleCount);
	346	if (done == NULL) {
	347	status = U_MEMORY_ALLOCATION_ERROR;
	348	goto error;
	349	}
	350	filteredRules = new UVector(status);
	351	if (U_FAILURE(status)) {
	352	goto error;
353	}
354
355	// Create initial rule
356	tzt.getTo()->getName(name);
357	res_initial = new InitialTimeZoneRule(name, tzt.getTo()->getRawOffset(),
358	tzt.getTo()->getDSTSavings());
359
360	// Mark rules which does not need to be processed
361	for (i = 0; i < ruleCount; i++) {
362	r = (TimeZoneRule*)orgRules->elementAt(i);
363	avail = r->getNextStart(start, res_initial->getRawOffset(), res_initial->getDSTSavings(), FALSE, time);
364	done[i] = !avail;
365	}
366
367	time = start;
368	while (!bFinalStd \|\| !bFinalDst) {
369	avail = getNextTransition(time, FALSE, tzt);
370	if (!avail) {
371	break;
372	}
729e4ab9 A	373	UDate updatedTime = tzt.getTime();
	374	if (updatedTime == time) {
	375	// Can get here if rules for start & end of daylight time have exactly
	376	// the same time.
	377	// TODO: fix getNextTransition() to prevent it?
	378	status = U_INVALID_STATE_ERROR;
	379	goto error;
	380	}
	381	time = updatedTime;
46f4442e A	382
	383	const TimeZoneRule *toRule = tzt.getTo();
	384	for (i = 0; i < ruleCount; i++) {
	385	r = (TimeZoneRule*)orgRules->elementAt(i);
	386	if (r == toRule) {
	387	break;
	388	}
	389	}
	390	if (i >= ruleCount) {
	391	// This case should never happen
	392	status = U_INVALID_STATE_ERROR;
	393	goto error;
	394	}
	395	if (done[i]) {
	396	continue;
	397	}
729e4ab9 A	398	const TimeArrayTimeZoneRule tar = dynamic_cast<const TimeArrayTimeZoneRule >(toRule);
	399	const AnnualTimeZoneRule *ar;
	400	if (tar != NULL) {
46f4442e A	401	// Get the previous raw offset and DST savings before the very first start time
	402	TimeZoneTransition tzt0;
	403	t = start;
	404	while (TRUE) {
	405	avail = getNextTransition(t, FALSE, tzt0);
	406	if (!avail) {
	407	break;
	408	}
	409	if ((tzt0.getTo()) == tar) {
	410	break;
	411	}
	412	t = tzt0.getTime();
	413	}
	414	if (avail) {
	415	// Check if the entire start times to be added
	416	tar->getFirstStart(tzt.getFrom()->getRawOffset(), tzt.getFrom()->getDSTSavings(), firstStart);
	417	if (firstStart > start) {
	418	// Just add the rule as is
	419	filteredRules->addElement(tar->clone(), status);
	420	if (U_FAILURE(status)) {
	421	goto error;
	422	}
	423	} else {
	424	// Colllect transitions after the start time
	425	int32_t startTimes;
	426	DateTimeRule::TimeRuleType timeType;
	427	int32_t idx;
	428
	429	startTimes = tar->countStartTimes();
	430	timeType = tar->getTimeType();
	431	for (idx = 0; idx < startTimes; idx++) {
	432	tar->getStartTimeAt(idx, t);
	433	if (timeType == DateTimeRule::STANDARD_TIME) {
	434	t -= tzt.getFrom()->getRawOffset();
	435	}
	436	if (timeType == DateTimeRule::WALL_TIME) {
	437	t -= tzt.getFrom()->getDSTSavings();
	438	}
	439	if (t > start) {
	440	break;
	441	}
	442	}
	443	int32_t asize = startTimes - idx;
	444	if (asize > 0) {
	445	newTimes = (UDate)uprv_malloc(sizeof(UDate) asize);
	446	if (newTimes == NULL) {
	447	status = U_MEMORY_ALLOCATION_ERROR;
	448	goto error;
	449	}
	450	for (int32_t newidx = 0; newidx < asize; newidx++) {
	451	tar->getStartTimeAt(idx + newidx, newTimes[newidx]);
	452	if (U_FAILURE(status)) {
	453	uprv_free(newTimes);
	454	newTimes = NULL;
	455	goto error;
	456	}
	457	}
	458	tar->getName(name);
	459	TimeArrayTimeZoneRule *newTar = new TimeArrayTimeZoneRule(name,
	460	tar->getRawOffset(), tar->getDSTSavings(), newTimes, asize, timeType);
	461	uprv_free(newTimes);
	462	filteredRules->addElement(newTar, status);
	463	if (U_FAILURE(status)) {
	464	goto error;
465	}
466	}
467	}
468	}
729e4ab9	469	} else if ((ar = dynamic_cast<const AnnualTimeZoneRule *>(toRule)) != NULL) {
46f4442e A	470	ar->getFirstStart(tzt.getFrom()->getRawOffset(), tzt.getFrom()->getDSTSavings(), firstStart);
	471	if (firstStart == tzt.getTime()) {
	472	// Just add the rule as is
	473	filteredRules->addElement(ar->clone(), status);
	474	if (U_FAILURE(status)) {
	475	goto error;
	476	}
	477	} else {
	478	// Calculate the transition year
	479	int32_t year, month, dom, dow, doy, mid;
	480	Grego::timeToFields(tzt.getTime(), year, month, dom, dow, doy, mid);
	481	// Re-create the rule
	482	ar->getName(name);
	483	AnnualTimeZoneRule *newAr = new AnnualTimeZoneRule(name, ar->getRawOffset(), ar->getDSTSavings(),
	484	*(ar->getRule()), year, ar->getEndYear());
	485	filteredRules->addElement(newAr, status);
	486	if (U_FAILURE(status)) {
	487	goto error;
	488	}
	489	}
	490	// check if this is a final rule
	491	if (ar->getEndYear() == AnnualTimeZoneRule::MAX_YEAR) {
	492	// After bot final standard and dst rules are processed,
	493	// exit this while loop.
	494	if (ar->getDSTSavings() == 0) {
	495	bFinalStd = TRUE;
	496	} else {
	497	bFinalDst = TRUE;
	498	}
	499	}
	500	}
	501	done[i] = TRUE;
	502	}
	503
	504	// Set the results
	505	if (orgRules != NULL) {
	506	while (!orgRules->isEmpty()) {
	507	r = (TimeZoneRule*)orgRules->orphanElementAt(0);
	508	delete r;
	509	}
	510	delete orgRules;
	511	}
	512	if (done != NULL) {
	513	uprv_free(done);
	514	}
	515
	516	initial = res_initial;
	517	transitionRules = filteredRules;
	518	return;
	519
	520	error:
	521	if (orgtrs != NULL) {
	522	uprv_free(orgtrs);
	523	}
	524	if (orgRules != NULL) {
	525	while (!orgRules->isEmpty()) {
	526	r = (TimeZoneRule*)orgRules->orphanElementAt(0);
	527	delete r;
	528	}
	529	delete orgRules;
	530	}
	531	if (done != NULL) {
729e4ab9 A	532	if (filteredRules != NULL) {
	533	while (!filteredRules->isEmpty()) {
	534	r = (TimeZoneRule*)filteredRules->orphanElementAt(0);
	535	delete r;
	536	}
	537	delete filteredRules;
	538	}
	539	delete res_initial;
46f4442e A	540	uprv_free(done);
	541	}
	542
	543	initial = NULL;
	544	transitionRules = NULL;
	545	}
	546
	547	void
729e4ab9	548	BasicTimeZone::getOffsetFromLocal(UDate /date/, int32_t /nonExistingTimeOpt/, int32_t /duplicatedTimeOpt/,
51004dcb	549	int32_t& /rawOffset/, int32_t& /dstOffset/, UErrorCode& status) const {
46f4442e A	550	if (U_FAILURE(status)) {
	551	return;
	552	}
	553	status = U_UNSUPPORTED_ERROR;
	554	}
	555
	556	U_NAMESPACE_END
	557
	558	#endif /* #if !UCONFIG_NO_FORMATTING */
	559
	560	//eof