925 lines
34 KiB
C++
925 lines
34 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 1997-1999, 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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* File SIMPLETZ.H
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*
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* Modification History:
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*
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* Date Name Description
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* 12/05/96 clhuang Creation.
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* 04/21/97 aliu Fixed miscellaneous bugs found by inspection and
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* testing.
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* 07/29/97 aliu Ported source bodies back from Java version with
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* numerous feature enhancements and bug fixes.
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* 08/10/98 stephen JDK 1.2 sync.
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* 09/17/98 stephen Fixed getOffset() for last hour of year and DST
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* 12/02/99 aliu Added TimeMode and constructor and setStart/EndRule
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* methods that take TimeMode. Whitespace cleanup.
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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/simpletz.h"
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#include "unicode/gregocal.h"
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#include "tzdat.h"
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U_NAMESPACE_BEGIN
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const char SimpleTimeZone::fgClassID = 0; // Value is irrelevant
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// WARNING: assumes that no rule is measured from the end of February,
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// since we don't handle leap years. Could handle assuming always
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// Gregorian, since we know they didn't have daylight time when
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// Gregorian calendar started.
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const int8_t SimpleTimeZone::staticMonthLength[] = {31,28,31,30,31,30,31,31,30,31,30,31};
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// *****************************************************************************
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// class SimpleTimeZone
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// *****************************************************************************
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SimpleTimeZone::SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID)
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: TimeZone(ID),
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startMonth(0),
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startDay(0),
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startDayOfWeek(0),
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startTime(0),
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startTimeMode(WALL_TIME),
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endTimeMode(WALL_TIME),
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endMonth(0),
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endDay(0),
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endDayOfWeek(0),
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endTime(0),
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startYear(0),
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rawOffset(rawOffsetGMT),
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useDaylight(FALSE),
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startMode(DOM_MODE),
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endMode(DOM_MODE),
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dstSavings(U_MILLIS_PER_HOUR)
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{
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}
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// -------------------------------------
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SimpleTimeZone::SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID,
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int8_t savingsStartMonth, int8_t savingsStartDay,
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int8_t savingsStartDayOfWeek, int32_t savingsStartTime,
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int8_t savingsEndMonth, int8_t savingsEndDay,
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int8_t savingsEndDayOfWeek, int32_t savingsEndTime,
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UErrorCode& status)
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: TimeZone(ID)
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{
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construct(rawOffsetGMT,
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savingsStartMonth, savingsStartDay, savingsStartDayOfWeek,
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savingsStartTime, WALL_TIME,
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savingsEndMonth, savingsEndDay, savingsEndDayOfWeek,
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savingsEndTime, WALL_TIME,
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U_MILLIS_PER_HOUR, status);
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}
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// -------------------------------------
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SimpleTimeZone::SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID,
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int8_t savingsStartMonth, int8_t savingsStartDay,
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int8_t savingsStartDayOfWeek, int32_t savingsStartTime,
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int8_t savingsEndMonth, int8_t savingsEndDay,
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int8_t savingsEndDayOfWeek, int32_t savingsEndTime,
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int32_t savingsDST, UErrorCode& status)
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: TimeZone(ID)
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{
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construct(rawOffsetGMT,
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savingsStartMonth, savingsStartDay, savingsStartDayOfWeek,
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savingsStartTime, WALL_TIME,
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savingsEndMonth, savingsEndDay, savingsEndDayOfWeek,
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savingsEndTime, WALL_TIME,
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savingsDST, status);
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}
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// -------------------------------------
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SimpleTimeZone::SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID,
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int8_t savingsStartMonth, int8_t savingsStartDay,
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int8_t savingsStartDayOfWeek, int32_t savingsStartTime,
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TimeMode savingsStartTimeMode,
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int8_t savingsEndMonth, int8_t savingsEndDay,
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int8_t savingsEndDayOfWeek, int32_t savingsEndTime,
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TimeMode savingsEndTimeMode,
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int32_t savingsDST, UErrorCode& status)
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: TimeZone(ID)
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{
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construct(rawOffsetGMT,
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savingsStartMonth, savingsStartDay, savingsStartDayOfWeek,
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savingsStartTime, savingsStartTimeMode,
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savingsEndMonth, savingsEndDay, savingsEndDayOfWeek,
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savingsEndTime, savingsEndTimeMode,
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savingsDST, status);
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}
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/**
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* Construct from memory-mapped data. For private use by TimeZone.
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*/
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SimpleTimeZone::SimpleTimeZone(const StandardZone& stdZone,
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const UnicodeString& ID)
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: TimeZone(ID)
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{
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UErrorCode status = U_ZERO_ERROR;
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construct(stdZone.gmtOffset,
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0, 0, 0, 0, WALL_TIME,
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0, 0, 0, 0, WALL_TIME,
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0, status);
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}
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/**
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* Construct from memory-mapped data. For private use by TimeZone.
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*/
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SimpleTimeZone::SimpleTimeZone(const DSTZone& dstZone,
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const UnicodeString& ID)
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: TimeZone(ID)
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{
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UErrorCode status = U_ZERO_ERROR;
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construct(dstZone.gmtOffset,
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dstZone.onsetRule.month, dstZone.onsetRule.dowim,
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dstZone.onsetRule.dow,
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dstZone.onsetRule.time * (int32_t)60000,
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(TimeMode)dstZone.onsetRule.mode,
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dstZone.ceaseRule.month, dstZone.ceaseRule.dowim,
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dstZone.ceaseRule.dow,
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dstZone.ceaseRule.time * (int32_t)60000,
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(TimeMode)dstZone.ceaseRule.mode,
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dstZone.dstSavings * (int32_t)60000, status);
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}
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/**
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* Internal construction method.
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*/
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void SimpleTimeZone::construct(int32_t rawOffsetGMT,
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int8_t savingsStartMonth,
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int8_t savingsStartDay,
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int8_t savingsStartDayOfWeek,
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int32_t savingsStartTime,
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TimeMode savingsStartTimeMode,
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int8_t savingsEndMonth,
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int8_t savingsEndDay,
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int8_t savingsEndDayOfWeek,
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int32_t savingsEndTime,
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TimeMode savingsEndTimeMode,
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int32_t savingsDST,
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UErrorCode& status)
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{
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this->rawOffset = rawOffsetGMT;
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this->startMonth = savingsStartMonth;
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this->startDay = savingsStartDay;
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this->startDayOfWeek = savingsStartDayOfWeek;
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this->startTime = savingsStartTime;
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this->startTimeMode = savingsStartTimeMode;
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this->endMonth = savingsEndMonth;
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this->endDay = savingsEndDay;
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this->endDayOfWeek = savingsEndDayOfWeek;
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this->endTime = savingsEndTime;
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this->endTimeMode = savingsEndTimeMode;
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this->dstSavings = savingsDST;
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this->startYear = 0;
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this->startMode = DOM_MODE;
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this->endMode = DOM_MODE;
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decodeRules(status);
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if (savingsDST <= 0) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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}
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}
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// -------------------------------------
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SimpleTimeZone::~SimpleTimeZone()
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{
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}
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// -------------------------------------
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// Called by TimeZone::createDefault(), then clone() inside a Mutex - be careful.
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SimpleTimeZone::SimpleTimeZone(const SimpleTimeZone &source)
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: TimeZone(source)
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{
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*this = source;
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}
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// -------------------------------------
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// Called by TimeZone::createDefault(), then clone() inside a Mutex - be careful.
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SimpleTimeZone &
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SimpleTimeZone::operator=(const SimpleTimeZone &right)
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{
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if (this != &right)
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{
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TimeZone::operator=(right);
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rawOffset = right.rawOffset;
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startMonth = right.startMonth;
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startDay = right.startDay;
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startDayOfWeek = right.startDayOfWeek;
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startTime = right.startTime;
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startTimeMode = right.startTimeMode;
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startMode = right.startMode;
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endMonth = right.endMonth;
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endDay = right.endDay;
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endDayOfWeek = right.endDayOfWeek;
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endTime = right.endTime;
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endTimeMode = right.endTimeMode;
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endMode = right.endMode;
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startYear = right.startYear;
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dstSavings = right.dstSavings;
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useDaylight = right.useDaylight;
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}
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return *this;
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}
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// -------------------------------------
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UBool
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SimpleTimeZone::operator==(const TimeZone& that) const
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{
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return ((this == &that) ||
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(getDynamicClassID() == that.getDynamicClassID() &&
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TimeZone::operator==(that) &&
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hasSameRules(that)));
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}
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// -------------------------------------
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// Called by TimeZone::createDefault() inside a Mutex - be careful.
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TimeZone*
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SimpleTimeZone::clone() const
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{
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return new SimpleTimeZone(*this);
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}
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// -------------------------------------
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/**
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* Sets the daylight savings starting year, that is, the year this time zone began
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* observing its specified daylight savings time rules. The time zone is considered
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* not to observe daylight savings time prior to that year; SimpleTimeZone doesn't
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* support historical daylight-savings-time rules.
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* @param year the daylight savings starting year.
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*/
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void
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SimpleTimeZone::setStartYear(int32_t year)
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{
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startYear = year;
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}
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// -------------------------------------
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/**
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* Sets the daylight savings starting rule. For example, in the U.S., Daylight Savings
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* Time starts at the first Sunday in April, at 2 AM in standard time.
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* Therefore, you can set the start rule by calling:
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* setStartRule(TimeFields.APRIL, 1, TimeFields.SUNDAY, 2*60*60*1000);
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* The dayOfWeekInMonth and dayOfWeek parameters together specify how to calculate
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* the exact starting date. Their exact meaning depend on their respective signs,
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* allowing various types of rules to be constructed, as follows:<ul>
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* <li>If both dayOfWeekInMonth and dayOfWeek are positive, they specify the
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* day of week in the month (e.g., (2, WEDNESDAY) is the second Wednesday
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* of the month).
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* <li>If dayOfWeek is positive and dayOfWeekInMonth is negative, they specify
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* the day of week in the month counting backward from the end of the month.
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* (e.g., (-1, MONDAY) is the last Monday in the month)
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* <li>If dayOfWeek is zero and dayOfWeekInMonth is positive, dayOfWeekInMonth
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* specifies the day of the month, regardless of what day of the week it is.
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* (e.g., (10, 0) is the tenth day of the month)
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* <li>If dayOfWeek is zero and dayOfWeekInMonth is negative, dayOfWeekInMonth
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* specifies the day of the month counting backward from the end of the
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* month, regardless of what day of the week it is (e.g., (-2, 0) is the
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* next-to-last day of the month).
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* <li>If dayOfWeek is negative and dayOfWeekInMonth is positive, they specify the
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* first specified day of the week on or after the specfied day of the month.
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* (e.g., (15, -SUNDAY) is the first Sunday after the 15th of the month
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* [or the 15th itself if the 15th is a Sunday].)
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* <li>If dayOfWeek and DayOfWeekInMonth are both negative, they specify the
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* last specified day of the week on or before the specified day of the month.
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* (e.g., (-20, -TUESDAY) is the last Tuesday before the 20th of the month
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* [or the 20th itself if the 20th is a Tuesday].)</ul>
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* @param month the daylight savings starting month. Month is 0-based.
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* eg, 0 for January.
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* @param dayOfWeekInMonth the daylight savings starting
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* day-of-week-in-month. Please see the member description for an example.
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* @param dayOfWeek the daylight savings starting day-of-week. Please see
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* the member description for an example.
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* @param time the daylight savings starting time. Please see the member
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* description for an example.
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*/
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void
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SimpleTimeZone::setStartRule(int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek,
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int32_t time, TimeMode mode, UErrorCode& status)
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{
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startMonth = (int8_t)month;
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startDay = (int8_t)dayOfWeekInMonth;
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startDayOfWeek = (int8_t)dayOfWeek;
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startTime = time;
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startTimeMode = mode;
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decodeStartRule(status);
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}
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// -------------------------------------
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void
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SimpleTimeZone::setStartRule(int32_t month, int32_t dayOfMonth,
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int32_t time, TimeMode mode, UErrorCode& status)
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{
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setStartRule(month, dayOfMonth, 0, time, mode, status);
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}
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// -------------------------------------
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void
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SimpleTimeZone::setStartRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
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int32_t time, TimeMode mode, UBool after, UErrorCode& status)
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{
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setStartRule(month, after ? dayOfMonth : -dayOfMonth,
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-dayOfWeek, time, mode, status);
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}
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// -------------------------------------
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/**
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* Sets the daylight savings ending rule. For example, in the U.S., Daylight
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* Savings Time ends at the last (-1) Sunday in October, at 2 AM in standard time.
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* Therefore, you can set the end rule by calling:
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* setEndRule(TimeFields.OCTOBER, -1, TimeFields.SUNDAY, 2*60*60*1000);
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* Various other types of rules can be specified by manipulating the dayOfWeek
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* and dayOfWeekInMonth parameters. For complete details, see the documentation
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* for setStartRule().
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* @param month the daylight savings ending month. Month is 0-based.
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* eg, 0 for January.
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* @param dayOfWeekInMonth the daylight savings ending
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* day-of-week-in-month. See setStartRule() for a complete explanation.
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* @param dayOfWeek the daylight savings ending day-of-week. See setStartRule()
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* for a complete explanation.
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* @param time the daylight savings ending time. Please see the member
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* description for an example.
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*/
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void
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SimpleTimeZone::setEndRule(int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek,
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int32_t time, TimeMode mode, UErrorCode& status)
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{
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endMonth = (int8_t)month;
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endDay = (int8_t)dayOfWeekInMonth;
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endDayOfWeek = (int8_t)dayOfWeek;
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endTime = time;
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endTimeMode = mode;
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decodeEndRule(status);
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}
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// -------------------------------------
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void
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SimpleTimeZone::setEndRule(int32_t month, int32_t dayOfMonth,
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int32_t time, TimeMode mode, UErrorCode& status)
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{
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setEndRule(month, dayOfMonth, 0, time, mode, status);
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}
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// -------------------------------------
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void
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SimpleTimeZone::setEndRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
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int32_t time, TimeMode mode, UBool after, UErrorCode& status)
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{
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setEndRule(month, after ? dayOfMonth : -dayOfMonth,
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-dayOfWeek, time, mode, status);
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}
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// -------------------------------------
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int32_t
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SimpleTimeZone::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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{
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// Check the month before indexing into staticMonthLength. This
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// duplicates the test that occurs in the 7-argument getOffset(),
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// however, this is unavoidable. We don't mind because this method, in
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// fact, should not be called; internal code should always call the
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// 7-argument getOffset(), and outside code should use Calendar.get(int
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// field) with fields ZONE_OFFSET and DST_OFFSET. We can't get rid of
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// this method because it's public API. - liu 8/10/98
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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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}
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return getOffset(era, year, month, day, dayOfWeek, millis, staticMonthLength[month], status);
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}
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int32_t
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SimpleTimeZone::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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// Check the month before indexing into staticMonthLength. This
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// duplicates a test that occurs in the 9-argument getOffset(),
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// however, this is unavoidable. We don't mind because this method, in
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// fact, should not be called; internal code should always call the
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// 9-argument getOffset(), and outside code should use Calendar.get(int
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// field) with fields ZONE_OFFSET and DST_OFFSET. We can't get rid of
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// this method because it's public API. - liu 8/10/98
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if (month < UCAL_JANUARY
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|| month > UCAL_DECEMBER) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return -1;
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}
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// TODO FIX We don't handle leap years yet!
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int32_t prevMonthLength = (month >= 1) ? staticMonthLength[month - 1] : 31;
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return getOffset(era, year, month, day, dayOfWeek, millis,
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monthLength, prevMonthLength, status);
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}
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int32_t
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SimpleTimeZone::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, int32_t prevMonthLength,
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UErrorCode& status) const
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{
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if(U_FAILURE(status)) return 0;
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if ((era != GregorianCalendar::AD && era != GregorianCalendar::BC)
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|| month < UCAL_JANUARY
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|| month > UCAL_DECEMBER
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|| day < 1
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|| day > monthLength
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|| dayOfWeek < UCAL_SUNDAY
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|| dayOfWeek > UCAL_SATURDAY
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|| millis < 0
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|| millis >= U_MILLIS_PER_DAY
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|| monthLength < 28
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|| monthLength > 31) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return -1;
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}
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int32_t result = rawOffset;
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// Bail out if we are before the onset of daylight savings time
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if(!useDaylight || year < startYear || era != GregorianCalendar::AD)
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return result;
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// Check for southern hemisphere. We assume that the start and end
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// month are different.
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UBool southern = (startMonth > endMonth);
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// Compare the date to the starting and ending rules.+1 = date>rule, -1
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// = date<rule, 0 = date==rule.
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int32_t startCompare = compareToRule((int8_t)month, (int8_t)monthLength, (int8_t)prevMonthLength,
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(int8_t)day, (int8_t)dayOfWeek, millis,
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startTimeMode == UTC_TIME ? -rawOffset : 0,
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startMode, (int8_t)startMonth, (int8_t)startDayOfWeek,
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(int8_t)startDay, startTime);
|
|
int32_t endCompare = 0;
|
|
|
|
/* We don't always have to compute endCompare. For many instances,
|
|
* startCompare is enough to determine if we are in DST or not. In the
|
|
* northern hemisphere, if we are before the start rule, we can't have
|
|
* DST. In the southern hemisphere, if we are after the start rule, we
|
|
* must have DST. This is reflected in the way the next if statement
|
|
* (not the one immediately following) short circuits. */
|
|
if(southern != (startCompare >= 0)) {
|
|
endCompare = compareToRule((int8_t)month, (int8_t)monthLength, (int8_t)prevMonthLength,
|
|
(int8_t)day, (int8_t)dayOfWeek, millis,
|
|
endTimeMode == WALL_TIME ? dstSavings :
|
|
(endTimeMode == UTC_TIME ? -rawOffset : 0),
|
|
endMode, (int8_t)endMonth, (int8_t)endDayOfWeek,
|
|
(int8_t)endDay, endTime);
|
|
}
|
|
|
|
// Check for both the northern and southern hemisphere cases. We
|
|
// assume that in the northern hemisphere, the start rule is before the
|
|
// end rule within the calendar year, and vice versa for the southern
|
|
// hemisphere.
|
|
if ((!southern && (startCompare >= 0 && endCompare < 0)) ||
|
|
(southern && (startCompare >= 0 || endCompare < 0)))
|
|
result += dstSavings;
|
|
|
|
return result;
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
/**
|
|
* Compare a given date in the year to a rule. Return 1, 0, or -1, depending
|
|
* on whether the date is after, equal to, or before the rule date. The
|
|
* millis are compared directly against the ruleMillis, so any
|
|
* standard-daylight adjustments must be handled by the caller.
|
|
*
|
|
* @return 1 if the date is after the rule date, -1 if the date is before
|
|
* the rule date, or 0 if the date is equal to the rule date.
|
|
*/
|
|
int32_t
|
|
SimpleTimeZone::compareToRule(int8_t month, int8_t monthLen, int8_t prevMonthLen,
|
|
int8_t dayOfMonth,
|
|
int8_t dayOfWeek, int32_t millis, int32_t millisDelta,
|
|
EMode ruleMode, int8_t ruleMonth, int8_t ruleDayOfWeek,
|
|
int8_t ruleDay, int32_t ruleMillis)
|
|
{
|
|
// Make adjustments for startTimeMode and endTimeMode
|
|
millis += millisDelta;
|
|
while (millis >= U_MILLIS_PER_DAY) {
|
|
millis -= U_MILLIS_PER_DAY;
|
|
++dayOfMonth;
|
|
dayOfWeek = (int8_t)(1 + (dayOfWeek % 7)); // dayOfWeek is one-based
|
|
if (dayOfMonth > monthLen) {
|
|
dayOfMonth = 1;
|
|
/* When incrementing the month, it is desirible to overflow
|
|
* from DECEMBER to DECEMBER+1, since we use the result to
|
|
* compare against a real month. Wraparound of the value
|
|
* leads to bug 4173604. */
|
|
++month;
|
|
}
|
|
}
|
|
while (millis < 0) {
|
|
millis += U_MILLIS_PER_DAY;
|
|
--dayOfMonth;
|
|
dayOfWeek = (int8_t)(1 + ((dayOfWeek+5) % 7)); // dayOfWeek is one-based
|
|
if (dayOfMonth < 1) {
|
|
dayOfMonth = prevMonthLen;
|
|
--month;
|
|
}
|
|
}
|
|
|
|
// first compare months. If they're different, we don't have to worry about days
|
|
// and times
|
|
if (month < ruleMonth) return -1;
|
|
else if (month > ruleMonth) return 1;
|
|
|
|
// calculate the actual day of month for the rule
|
|
int32_t ruleDayOfMonth = 0;
|
|
switch (ruleMode)
|
|
{
|
|
// if the mode is day-of-month, the day of month is given
|
|
case DOM_MODE:
|
|
ruleDayOfMonth = ruleDay;
|
|
break;
|
|
|
|
// if the mode is day-of-week-in-month, calculate the day-of-month from it
|
|
case DOW_IN_MONTH_MODE:
|
|
// In this case ruleDay is the day-of-week-in-month (this code is using
|
|
// the dayOfWeek and dayOfMonth parameters to figure out the day-of-week
|
|
// of the first day of the month, so it's trusting that they're really
|
|
// consistent with each other)
|
|
if (ruleDay > 0)
|
|
ruleDayOfMonth = 1 + (ruleDay - 1) * 7 +
|
|
(7 + ruleDayOfWeek - (dayOfWeek - dayOfMonth + 1)) % 7;
|
|
|
|
// if ruleDay is negative (we assume it's not zero here), we have to do
|
|
// the same calculation figuring backward from the last day of the month.
|
|
// (staticMonthLength gives us that last day. We don't take leap years
|
|
// into account, so this may not work right for February.)
|
|
else
|
|
{
|
|
// (again, this code is trusting that dayOfMonth and dayOfMonth are
|
|
// consistent with each other here, since we're using them to figure
|
|
// the day of week of the first of the month)
|
|
ruleDayOfMonth = monthLen + (ruleDay + 1) * 7 -
|
|
(7 + (dayOfWeek + monthLen - dayOfMonth) - ruleDayOfWeek) % 7;
|
|
}
|
|
break;
|
|
|
|
case DOW_GE_DOM_MODE:
|
|
ruleDayOfMonth = ruleDay +
|
|
(49 + ruleDayOfWeek - ruleDay - dayOfWeek + dayOfMonth) % 7;
|
|
break;
|
|
|
|
case DOW_LE_DOM_MODE:
|
|
ruleDayOfMonth = ruleDay -
|
|
(49 - ruleDayOfWeek + ruleDay + dayOfWeek - dayOfMonth) % 7;
|
|
// Note at this point ruleDayOfMonth may be <1, although it will
|
|
// be >=1 for well-formed rules.
|
|
break;
|
|
}
|
|
|
|
// now that we have a real day-in-month for the rule, we can compare days...
|
|
if (dayOfMonth < ruleDayOfMonth) return -1;
|
|
else if (dayOfMonth > ruleDayOfMonth) return 1;
|
|
|
|
// ...and if they're equal, we compare times
|
|
if (millis < ruleMillis) return -1;
|
|
else if (millis > ruleMillis) return 1;
|
|
else return 0;
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
int32_t
|
|
SimpleTimeZone::getRawOffset() const
|
|
{
|
|
return rawOffset;
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
void
|
|
SimpleTimeZone::setRawOffset(int32_t offsetMillis)
|
|
{
|
|
rawOffset = offsetMillis;
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
void
|
|
SimpleTimeZone::setDSTSavings(int32_t millisSavedDuringDST, UErrorCode& status)
|
|
{
|
|
if (millisSavedDuringDST <= 0) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
}
|
|
else {
|
|
dstSavings = millisSavedDuringDST;
|
|
}
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
int32_t
|
|
SimpleTimeZone::getDSTSavings() const
|
|
{
|
|
return dstSavings;
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
UBool
|
|
SimpleTimeZone::useDaylightTime() const
|
|
{
|
|
return useDaylight;
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
/**
|
|
* Overrides TimeZone
|
|
* Queries if the given date is in Daylight Savings Time.
|
|
*/
|
|
UBool SimpleTimeZone::inDaylightTime(UDate date, UErrorCode& status) const
|
|
{
|
|
// This method is wasteful since it creates a new GregorianCalendar and
|
|
// deletes it each time it is called. However, this is a deprecated method
|
|
// and provided only for Java compatibility as of 8/6/97 [LIU].
|
|
if (U_FAILURE(status)) return FALSE;
|
|
GregorianCalendar *gc = new GregorianCalendar(*this, status);
|
|
/* test for NULL */
|
|
if (gc == 0) {
|
|
status = U_MEMORY_ALLOCATION_ERROR;
|
|
return FALSE;
|
|
}
|
|
gc->setTime(date, status);
|
|
UBool result = gc->inDaylightTime(status);
|
|
delete gc;
|
|
return result;
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
/**
|
|
* Return true if this zone has the same rules and offset as another zone.
|
|
* @param other the TimeZone object to be compared with
|
|
* @return true if the given zone has the same rules and offset as this one
|
|
*/
|
|
UBool
|
|
SimpleTimeZone::hasSameRules(const TimeZone& other) const
|
|
{
|
|
if (this == &other) return TRUE;
|
|
if (other.getDynamicClassID() != SimpleTimeZone::getStaticClassID()) return FALSE;
|
|
SimpleTimeZone *that = (SimpleTimeZone*)&other;
|
|
return rawOffset == that->rawOffset &&
|
|
useDaylight == that->useDaylight &&
|
|
(!useDaylight
|
|
// Only check rules if using DST
|
|
|| (dstSavings == that->dstSavings &&
|
|
startMode == that->startMode &&
|
|
startMonth == that->startMonth &&
|
|
startDay == that->startDay &&
|
|
startDayOfWeek == that->startDayOfWeek &&
|
|
startTime == that->startTime &&
|
|
startTimeMode == that->startTimeMode &&
|
|
endMode == that->endMode &&
|
|
endMonth == that->endMonth &&
|
|
endDay == that->endDay &&
|
|
endDayOfWeek == that->endDayOfWeek &&
|
|
endTime == that->endTime &&
|
|
endTimeMode == that->endTimeMode &&
|
|
startYear == that->startYear));
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
//----------------------------------------------------------------------
|
|
// Rule representation
|
|
//
|
|
// We represent the following flavors of rules:
|
|
// 5 the fifth of the month
|
|
// lastSun the last Sunday in the month
|
|
// lastMon the last Monday in the month
|
|
// Sun>=8 first Sunday on or after the eighth
|
|
// Sun<=25 last Sunday on or before the 25th
|
|
// This is further complicated by the fact that we need to remain
|
|
// backward compatible with the 1.1 FCS. Finally, we need to minimize
|
|
// API changes. In order to satisfy these requirements, we support
|
|
// three representation systems, and we translate between them.
|
|
//
|
|
// INTERNAL REPRESENTATION
|
|
// This is the format SimpleTimeZone objects take after construction or
|
|
// streaming in is complete. Rules are represented directly, using an
|
|
// unencoded format. We will discuss the start rule only below; the end
|
|
// rule is analogous.
|
|
// startMode Takes on enumerated values DAY_OF_MONTH,
|
|
// DOW_IN_MONTH, DOW_AFTER_DOM, or DOW_BEFORE_DOM.
|
|
// startDay The day of the month, or for DOW_IN_MONTH mode, a
|
|
// value indicating which DOW, such as +1 for first,
|
|
// +2 for second, -1 for last, etc.
|
|
// startDayOfWeek The day of the week. Ignored for DAY_OF_MONTH.
|
|
//
|
|
// ENCODED REPRESENTATION
|
|
// This is the format accepted by the constructor and by setStartRule()
|
|
// and setEndRule(). It uses various combinations of positive, negative,
|
|
// and zero values to encode the different rules. This representation
|
|
// allows us to specify all the different rule flavors without altering
|
|
// the API.
|
|
// MODE startMonth startDay startDayOfWeek
|
|
// DOW_IN_MONTH_MODE >=0 !=0 >0
|
|
// DOM_MODE >=0 >0 ==0
|
|
// DOW_GE_DOM_MODE >=0 >0 <0
|
|
// DOW_LE_DOM_MODE >=0 <0 <0
|
|
// (no DST) don't care ==0 don't care
|
|
//
|
|
// STREAMED REPRESENTATION
|
|
// We must retain binary compatibility with the 1.1 FCS. The 1.1 code only
|
|
// handles DOW_IN_MONTH_MODE and non-DST mode, the latter indicated by the
|
|
// flag useDaylight. When we stream an object out, we translate into an
|
|
// approximate DOW_IN_MONTH_MODE representation so the object can be parsed
|
|
// and used by 1.1 code. Following that, we write out the full
|
|
// representation separately so that contemporary code can recognize and
|
|
// parse it. The full representation is written in a "packed" format,
|
|
// consisting of a version number, a length, and an array of bytes. Future
|
|
// versions of this class may specify different versions. If they wish to
|
|
// include additional data, they should do so by storing them after the
|
|
// packed representation below.
|
|
//----------------------------------------------------------------------
|
|
|
|
/**
|
|
* Given a set of encoded rules in startDay and startDayOfMonth, decode
|
|
* them and set the startMode appropriately. Do the same for endDay and
|
|
* endDayOfMonth. Upon entry, the day of week variables may be zero or
|
|
* negative, in order to indicate special modes. The day of month
|
|
* variables may also be negative. Upon exit, the mode variables will be
|
|
* set, and the day of week and day of month variables will be positive.
|
|
* This method also recognizes a startDay or endDay of zero as indicating
|
|
* no DST.
|
|
*/
|
|
void
|
|
SimpleTimeZone::decodeRules(UErrorCode& status)
|
|
{
|
|
decodeStartRule(status);
|
|
decodeEndRule(status);
|
|
}
|
|
|
|
/**
|
|
* Decode the start rule and validate the parameters. The parameters are
|
|
* expected to be in encoded form, which represents the various rule modes
|
|
* by negating or zeroing certain values. Representation formats are:
|
|
* <p>
|
|
* <pre>
|
|
* DOW_IN_MONTH DOM DOW>=DOM DOW<=DOM no DST
|
|
* ------------ ----- -------- -------- ----------
|
|
* month 0..11 same same same don't care
|
|
* day -5..5 1..31 1..31 -1..-31 0
|
|
* dayOfWeek 1..7 0 -1..-7 -1..-7 don't care
|
|
* time 0..ONEDAY same same same don't care
|
|
* </pre>
|
|
* The range for month does not include UNDECIMBER since this class is
|
|
* really specific to GregorianCalendar, which does not use that month.
|
|
* The range for time includes ONEDAY (vs. ending at ONEDAY-1) because the
|
|
* end rule is an exclusive limit point. That is, the range of times that
|
|
* are in DST include those >= the start and < the end. For this reason,
|
|
* it should be possible to specify an end of ONEDAY in order to include the
|
|
* entire day. Although this is equivalent to time 0 of the following day,
|
|
* it's not always possible to specify that, for example, on December 31.
|
|
* While arguably the start range should still be 0..ONEDAY-1, we keep
|
|
* the start and end ranges the same for consistency.
|
|
*/
|
|
void
|
|
SimpleTimeZone::decodeStartRule(UErrorCode& status)
|
|
{
|
|
if(U_FAILURE(status)) return;
|
|
|
|
useDaylight = (UBool)((startDay != 0) && (endDay != 0) ? TRUE : FALSE);
|
|
if (useDaylight && dstSavings == 0) {
|
|
dstSavings = U_MILLIS_PER_HOUR;
|
|
}
|
|
if (startDay != 0) {
|
|
if (startMonth < UCAL_JANUARY || startMonth > UCAL_DECEMBER) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
if (startTime < 0 || startTime > U_MILLIS_PER_DAY ||
|
|
startTimeMode < WALL_TIME || startTimeMode > UTC_TIME) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
if (startDayOfWeek == 0) {
|
|
startMode = DOM_MODE;
|
|
} else {
|
|
if (startDayOfWeek > 0) {
|
|
startMode = DOW_IN_MONTH_MODE;
|
|
} else {
|
|
startDayOfWeek = (int8_t)-startDayOfWeek;
|
|
if (startDay > 0) {
|
|
startMode = DOW_GE_DOM_MODE;
|
|
} else {
|
|
startDay = (int8_t)-startDay;
|
|
startMode = DOW_LE_DOM_MODE;
|
|
}
|
|
}
|
|
if (startDayOfWeek > UCAL_SATURDAY) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
}
|
|
if (startMode == DOW_IN_MONTH_MODE) {
|
|
if (startDay < -5 || startDay > 5) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
} else if (startDay > staticMonthLength[startMonth]) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Decode the end rule and validate the parameters. This method is exactly
|
|
* analogous to decodeStartRule().
|
|
* @see decodeStartRule
|
|
*/
|
|
void
|
|
SimpleTimeZone::decodeEndRule(UErrorCode& status)
|
|
{
|
|
if(U_FAILURE(status)) return;
|
|
|
|
useDaylight = (UBool)((startDay != 0) && (endDay != 0) ? TRUE : FALSE);
|
|
if (useDaylight && dstSavings == 0) {
|
|
dstSavings = U_MILLIS_PER_HOUR;
|
|
}
|
|
if (endDay != 0) {
|
|
if (endMonth < UCAL_JANUARY || endMonth > UCAL_DECEMBER) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
if (endTime < 0 || endTime > U_MILLIS_PER_DAY ||
|
|
endTimeMode < WALL_TIME || endTimeMode > UTC_TIME) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
if (endDayOfWeek == 0) {
|
|
endMode = DOM_MODE;
|
|
} else {
|
|
if (endDayOfWeek > 0) {
|
|
endMode = DOW_IN_MONTH_MODE;
|
|
} else {
|
|
endDayOfWeek = (int8_t)-endDayOfWeek;
|
|
if (endDay > 0) {
|
|
endMode = DOW_GE_DOM_MODE;
|
|
} else {
|
|
endDay = (int8_t)-endDay;
|
|
endMode = DOW_LE_DOM_MODE;
|
|
}
|
|
}
|
|
if (endDayOfWeek > UCAL_SATURDAY) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
}
|
|
if (endMode == DOW_IN_MONTH_MODE) {
|
|
if (endDay < -5 || endDay > 5) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
} else if (endDay > staticMonthLength[endMonth]) {
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif /* #if !UCONFIG_NO_FORMATTING */
|
|
|
|
//eof
|