829 lines
27 KiB
C++
829 lines
27 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 2007, International Business Machines Corporation and *
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* others. All Rights Reserved. *
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*******************************************************************************
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*/
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_FORMATTING
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#include "unicode/rbtz.h"
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#include "unicode/gregocal.h"
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#include "uvector.h"
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#include "gregoimp.h"
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#include "cmemory.h"
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U_NAMESPACE_BEGIN
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/**
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* A struct representing a time zone transition
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*/
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struct Transition {
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UDate time;
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TimeZoneRule* from;
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TimeZoneRule* to;
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};
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static UBool compareRules(UVector* rules1, UVector* rules2) {
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if (rules1 == NULL && rules2 == NULL) {
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return TRUE;
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} else if (rules1 == NULL || rules2 == NULL) {
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return FALSE;
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}
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int32_t size = rules1->size();
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if (size != rules2->size()) {
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return FALSE;
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}
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for (int32_t i = 0; i < size; i++) {
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TimeZoneRule *r1 = (TimeZoneRule*)rules1->elementAt(i);
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TimeZoneRule *r2 = (TimeZoneRule*)rules2->elementAt(i);
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if (r1 != r2) {
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return FALSE;
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}
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}
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return TRUE;
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}
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static UDate getTransitionTime(Transition* transition, UBool local) {
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UDate time = transition->time;
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if (local) {
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time += transition->from->getRawOffset() + transition->from->getDSTSavings();
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}
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return time;
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}
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(RuleBasedTimeZone)
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RuleBasedTimeZone::RuleBasedTimeZone(const UnicodeString& id, InitialTimeZoneRule* initialRule)
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: BasicTimeZone(id), fInitialRule(initialRule), fHistoricRules(NULL), fFinalRules(NULL),
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fHistoricTransitions(NULL), fUpToDate(FALSE) {
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}
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RuleBasedTimeZone::RuleBasedTimeZone(const RuleBasedTimeZone& source)
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: BasicTimeZone(source), fInitialRule(source.fInitialRule->clone()),
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fHistoricRules(NULL), fFinalRules(NULL), fHistoricTransitions(NULL), fUpToDate(FALSE) {
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}
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RuleBasedTimeZone::~RuleBasedTimeZone() {
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deleteTransitions();
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deleteRules();
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}
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RuleBasedTimeZone&
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RuleBasedTimeZone::operator=(const RuleBasedTimeZone& right) {
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if (*this != right) {
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BasicTimeZone::operator=(right);
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deleteRules();
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fInitialRule = right.fInitialRule->clone();
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fHistoricRules = copyRules(right.fHistoricRules);
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fFinalRules = copyRules(right.fFinalRules);
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deleteTransitions();
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fUpToDate = FALSE;
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}
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return *this;
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}
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UBool
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RuleBasedTimeZone::operator==(const TimeZone& that) const {
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if (this == &that) {
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return TRUE;
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}
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if (getDynamicClassID() != that.getDynamicClassID()
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|| BasicTimeZone::operator==(that) == FALSE) {
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return FALSE;
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}
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RuleBasedTimeZone *rbtz = (RuleBasedTimeZone*)&that;
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if (*fInitialRule != *(rbtz->fInitialRule)) {
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return FALSE;
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}
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if (compareRules(fHistoricRules, rbtz->fHistoricRules)
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&& compareRules(fFinalRules, rbtz->fFinalRules)) {
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return TRUE;
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}
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return FALSE;
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}
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UBool
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RuleBasedTimeZone::operator!=(const TimeZone& that) const {
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return !operator==(that);
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}
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void
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RuleBasedTimeZone::addTransitionRule(TimeZoneRule* rule, UErrorCode& status) {
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if (U_FAILURE(status)) {
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return;
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}
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if (rule->getDynamicClassID() == AnnualTimeZoneRule::getStaticClassID()
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&& ((AnnualTimeZoneRule*)rule)->getEndYear() == AnnualTimeZoneRule::MAX_YEAR) {
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// A final rule
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if (fFinalRules == NULL) {
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fFinalRules = new UVector(status);
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if (U_FAILURE(status)) {
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return;
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}
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} else if (fFinalRules->size() >= 2) {
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// Cannot handle more than two final rules
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status = U_INVALID_STATE_ERROR;
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return;
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}
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fFinalRules->addElement((void*)rule, status);
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} else {
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// Non-final rule
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if (fHistoricRules == NULL) {
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fHistoricRules = new UVector(status);
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if (U_FAILURE(status)) {
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return;
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}
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}
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fHistoricRules->addElement((void*)rule, status);
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}
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// Mark dirty, so transitions are recalculated at next complete() call
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fUpToDate = FALSE;
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}
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void
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RuleBasedTimeZone::complete(UErrorCode& status) {
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if (U_FAILURE(status)) {
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return;
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}
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if (fUpToDate) {
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return;
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}
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// Make sure either no final rules or a pair of AnnualTimeZoneRules
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// are available.
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if (fFinalRules != NULL && fFinalRules->size() != 2) {
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status = U_INVALID_STATE_ERROR;
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return;
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}
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UBool *done = NULL;
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// Create a TimezoneTransition and add to the list
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if (fHistoricRules != NULL || fFinalRules != NULL) {
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TimeZoneRule *curRule = fInitialRule;
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UDate lastTransitionTime = MIN_MILLIS;
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// Build the transition array which represents historical time zone
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// transitions.
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if (fHistoricRules != NULL && fHistoricRules->size() > 0) {
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int32_t i;
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int32_t historicCount = fHistoricRules->size();
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done = (UBool*)uprv_malloc(sizeof(UBool) * historicCount);
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if (done == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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goto cleanup;
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}
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for (i = 0; i < historicCount; i++) {
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done[i] = FALSE;
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}
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while (true) {
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int32_t curStdOffset = curRule->getRawOffset();
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int32_t curDstSavings = curRule->getDSTSavings();
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UDate nextTransitionTime = MAX_MILLIS;
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TimeZoneRule *nextRule = NULL;
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TimeZoneRule *r = NULL;
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UBool avail;
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UDate tt;
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UnicodeString curName, name;
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curRule->getName(curName);
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for (i = 0; i < historicCount; i++) {
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if (done[i]) {
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continue;
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}
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r = (TimeZoneRule*)fHistoricRules->elementAt(i);
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avail = r->getNextStart(lastTransitionTime, curStdOffset, curDstSavings, false, tt);
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if (!avail) {
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// No more transitions from this rule - skip this rule next time
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done[i] = TRUE;
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} else {
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r->getName(name);
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if (*r == *curRule ||
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(name == curName && r->getRawOffset() == curRule->getRawOffset()
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&& r->getDSTSavings() == curRule->getDSTSavings())) {
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continue;
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}
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if (tt < nextTransitionTime) {
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nextTransitionTime = tt;
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nextRule = r;
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}
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}
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}
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if (nextRule == NULL) {
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// Check if all historic rules are done
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UBool bDoneAll = TRUE;
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for (int32_t j = 0; j < historicCount; j++) {
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if (!done[j]) {
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bDoneAll = FALSE;
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break;
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}
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}
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if (bDoneAll) {
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break;
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}
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}
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if (fFinalRules != NULL) {
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// Check if one of final rules has earlier transition date
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for (i = 0; i < 2 /* fFinalRules->size() */; i++) {
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TimeZoneRule *fr = (TimeZoneRule*)fFinalRules->elementAt(i);
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if (*fr == *curRule) {
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continue;
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}
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r = (TimeZoneRule*)fFinalRules->elementAt(i);
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avail = r->getNextStart(lastTransitionTime, curStdOffset, curDstSavings, false, tt);
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if (avail) {
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if (tt < nextTransitionTime) {
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nextTransitionTime = tt;
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nextRule = r;
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}
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}
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}
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}
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if (nextRule == NULL) {
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// Nothing more
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break;
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}
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if (fHistoricTransitions == NULL) {
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fHistoricTransitions = new UVector(status);
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if (U_FAILURE(status)) {
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goto cleanup;
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}
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}
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Transition *trst = (Transition*)uprv_malloc(sizeof(Transition));
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if (trst == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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goto cleanup;
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}
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trst->time = nextTransitionTime;
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trst->from = curRule;
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trst->to = nextRule;
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fHistoricTransitions->addElement(trst, status);
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if (U_FAILURE(status)) {
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goto cleanup;
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}
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lastTransitionTime = nextTransitionTime;
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curRule = nextRule;
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}
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}
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if (fFinalRules != NULL) {
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if (fHistoricTransitions == NULL) {
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fHistoricTransitions = new UVector(status);
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if (U_FAILURE(status)) {
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goto cleanup;
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}
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}
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// Append the first transition for each
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TimeZoneRule *rule0 = (TimeZoneRule*)fFinalRules->elementAt(0);
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TimeZoneRule *rule1 = (TimeZoneRule*)fFinalRules->elementAt(1);
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UDate tt0, tt1;
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UBool avail0 = rule0->getNextStart(lastTransitionTime, curRule->getRawOffset(), curRule->getDSTSavings(), false, tt0);
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UBool avail1 = rule1->getNextStart(lastTransitionTime, curRule->getRawOffset(), curRule->getDSTSavings(), false, tt1);
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if (!avail0 || !avail1) {
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// Should not happen, because both rules are permanent
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status = U_INVALID_STATE_ERROR;
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goto cleanup;
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}
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Transition *final0 = (Transition*)uprv_malloc(sizeof(Transition));
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if (final0 == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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goto cleanup;
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}
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Transition *final1 = (Transition*)uprv_malloc(sizeof(Transition));
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if (final1 == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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goto cleanup;
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}
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if (tt0 < tt1) {
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final0->time = tt0;
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final0->from = curRule;
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final0->to = rule0;
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rule1->getNextStart(tt0, rule0->getRawOffset(), rule0->getDSTSavings(), false, final1->time);
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final1->from = rule0;
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final1->to = rule1;
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} else {
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final0->time = tt1;
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final0->from = curRule;
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final0->to = rule1;
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rule0->getNextStart(tt1, rule1->getRawOffset(), rule1->getDSTSavings(), false, final1->time);
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final1->from = rule1;
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final1->to = rule0;
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}
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fHistoricTransitions->addElement(final0, status);
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if (U_FAILURE(status)) {
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goto cleanup;
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}
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fHistoricTransitions->addElement(final1, status);
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if (U_FAILURE(status)) {
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goto cleanup;
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}
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}
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}
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fUpToDate = TRUE;
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return;
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cleanup:
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deleteTransitions();
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if (done != NULL) {
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uprv_free(done);
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}
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fUpToDate = FALSE;
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}
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TimeZone*
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RuleBasedTimeZone::clone(void) const {
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return new RuleBasedTimeZone(*this);
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}
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int32_t
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RuleBasedTimeZone::getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
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uint8_t dayOfWeek, int32_t millis, UErrorCode& status) const {
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if (U_FAILURE(status)) {
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return 0;
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}
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if (month < UCAL_JANUARY || month > UCAL_DECEMBER) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return 0;
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} else {
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return getOffset(era, year, month, day, dayOfWeek, millis,
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Grego::monthLength(year, month), status);
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}
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}
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int32_t
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RuleBasedTimeZone::getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
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uint8_t dayOfWeek, int32_t millis,
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int32_t monthLength, UErrorCode& status) const {
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// dayOfWeek and monthLength are unused
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if (U_FAILURE(status)) {
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return 0;
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}
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if (era == GregorianCalendar::BC) {
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// Convert to extended year
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year = 1 - year;
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}
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int32_t rawOffset, dstOffset;
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UDate time = (UDate)Grego::fieldsToDay(year, month, day) * U_MILLIS_PER_DAY + millis;
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getOffset(time, true, rawOffset, dstOffset, status);
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if (U_FAILURE(status)) {
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return 0;
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}
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return (rawOffset + dstOffset);
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}
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void
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RuleBasedTimeZone::getOffset(UDate date, UBool local, int32_t& rawOffset,
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int32_t& dstOffset, UErrorCode& status) const {
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rawOffset = 0;
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dstOffset = 0;
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if (U_FAILURE(status)) {
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return;
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}
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if (!fUpToDate) {
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// Transitions are not yet resolved. We cannot do it here
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// because this method is const. Thus, do nothing and return
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// error status.
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status = U_INVALID_STATE_ERROR;
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return;
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}
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const TimeZoneRule *rule = NULL;
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if (fHistoricTransitions == NULL) {
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rule = fInitialRule;
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} else {
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UDate tstart = getTransitionTime((Transition*)fHistoricTransitions->elementAt(0), local);
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if (date < tstart) {
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rule = fInitialRule;
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} else {
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int32_t idx = fHistoricTransitions->size() - 1;
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UDate tend = getTransitionTime((Transition*)fHistoricTransitions->elementAt(idx), local);
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if (date > tend) {
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if (fFinalRules != NULL) {
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rule = findRuleInFinal(date, local);
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} else {
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// no final rule, use the last rule
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rule = ((Transition*)fHistoricTransitions->elementAt(idx))->to;
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}
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} else {
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// Find a historical transition
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while (idx >= 0) {
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if (date >= getTransitionTime((Transition*)fHistoricTransitions->elementAt(idx), local)) {
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break;
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}
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idx--;
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}
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rule = ((Transition*)fHistoricTransitions->elementAt(idx))->to;
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}
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}
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}
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if (rule != NULL) {
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rawOffset = rule->getRawOffset();
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dstOffset = rule->getDSTSavings();
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}
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}
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void
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RuleBasedTimeZone::setRawOffset(int32_t offsetMillis) {
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// We don't support this operation at this moment.
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// Nothing to do!
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}
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int32_t
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RuleBasedTimeZone::getRawOffset(void) const {
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// Note: This implementation returns standard GMT offset
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// as of current time.
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UErrorCode status = U_ZERO_ERROR;
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int32_t raw, dst;
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getOffset(uprv_getUTCtime() * U_MILLIS_PER_SECOND,
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FALSE, raw, dst, status);
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return raw;
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}
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UBool
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RuleBasedTimeZone::useDaylightTime(void) const {
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// Note: This implementation returns true when
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// daylight saving time is used as of now or
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// after the next transition.
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UErrorCode status = U_ZERO_ERROR;
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UDate now = uprv_getUTCtime() * U_MILLIS_PER_SECOND;
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int32_t raw, dst;
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getOffset(now, FALSE, raw, dst, status);
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if (dst != 0) {
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return TRUE;
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}
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// If DST is not used now, check if DST is used after the next transition
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UDate time;
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TimeZoneRule *from, *to;
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UBool avail = findNext(now, FALSE, time, from, to);
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if (avail && to->getDSTSavings() != 0) {
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return TRUE;
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}
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return FALSE;
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}
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|
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UBool
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RuleBasedTimeZone::inDaylightTime(UDate date, UErrorCode& status) const {
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if (U_FAILURE(status)) {
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return FALSE;
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}
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int32_t raw, dst;
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getOffset(date, FALSE, raw, dst, status);
|
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if (dst != 0) {
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return TRUE;
|
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}
|
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return FALSE;
|
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}
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|
|
UBool
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RuleBasedTimeZone::hasSameRules(const TimeZone& other) const {
|
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if (this == &other) {
|
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return TRUE;
|
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}
|
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if (getDynamicClassID() != other.getDynamicClassID()) {
|
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return FALSE;
|
|
}
|
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const RuleBasedTimeZone& that = (const RuleBasedTimeZone&)other;
|
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if (*fInitialRule != *(that.fInitialRule)) {
|
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return FALSE;
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}
|
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if (compareRules(fHistoricRules, that.fHistoricRules)
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&& compareRules(fFinalRules, that.fFinalRules)) {
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return TRUE;
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}
|
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return FALSE;
|
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}
|
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|
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UBool
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RuleBasedTimeZone::getNextTransition(UDate base, UBool inclusive, TimeZoneTransition& result) /*const*/ {
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UErrorCode status = U_ZERO_ERROR;
|
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complete(status);
|
|
if (U_FAILURE(status)) {
|
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return FALSE;
|
|
}
|
|
UDate transitionTime;
|
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TimeZoneRule *fromRule, *toRule;
|
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UBool found = findNext(base, inclusive, transitionTime, fromRule, toRule);
|
|
if (found) {
|
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result.setTime(transitionTime);
|
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result.setFrom((const TimeZoneRule&)*fromRule);
|
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result.setTo((const TimeZoneRule&)*toRule);
|
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return TRUE;
|
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}
|
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return FALSE;
|
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}
|
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|
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UBool
|
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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;
|
|
}
|
|
|
|
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) 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;
|
|
|
|
base = local ? date - fr1->getRawOffset() - fr1->getDSTSavings() : date;
|
|
UBool avail0 = fr0->getPreviousStart(base, fr1->getRawOffset(), fr1->getDSTSavings(), true, start0);
|
|
|
|
base = local ? date - fr0->getRawOffset() - fr0->getDSTSavings() : date;
|
|
UBool avail1 = fr1->getPreviousStart(base, fr0->getRawOffset(), fr0->getDSTSavings(), true, start1);
|
|
|
|
if (avail0 && (!avail1 || start0 > start1)) {
|
|
return fr0;
|
|
} else if (avail1) {
|
|
return fr1;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
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 = getTransitionTime(tzt, FALSE);
|
|
if (tt > base || (inclusive && tt == base)) {
|
|
result = *tzt;
|
|
found = TRUE;
|
|
} else {
|
|
int32_t idx = fHistoricTransitions->size() - 1;
|
|
tzt = (Transition*)fHistoricTransitions->elementAt(idx);
|
|
tt = getTransitionTime(tzt, FALSE);
|
|
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 (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 = getTransitionTime(tzt, FALSE);
|
|
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()) {
|
|
// 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 = getTransitionTime(tzt, FALSE);
|
|
if (inclusive && tt == base) {
|
|
result = *tzt;
|
|
found = TRUE;
|
|
} else if (tt < base) {
|
|
int32_t idx = fHistoricTransitions->size() - 1;
|
|
tzt = (Transition*)fHistoricTransitions->elementAt(idx);
|
|
tt = getTransitionTime(tzt, FALSE);
|
|
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 (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 = getTransitionTime(tzt, FALSE);
|
|
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;
|
|
}
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif /* #if !UCONFIG_NO_FORMATTING */
|
|
|
|
//eof
|
|
|