588 lines
27 KiB
C++
588 lines
27 KiB
C++
/*
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* Copyright © {1997-1999}, International Business Machines Corporation and others. All Rights Reserved.
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* *
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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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* 04/21/97 aliu Overhauled header.
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* 08/10/98 stephen JDK 1.2 sync
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* Added setStartRule() / setEndRule() overloads
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* Added hasSameRules()
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* 09/02/98 stephen Added getOffset(monthLen)
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* Changed getOffset() to take UErrorCode
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* 07/09/99 stephen Removed millisPerHour (unused, for HP compiler)
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* 12/02/99 aliu Added TimeMode and constructor and setStart/EndRule
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* methods that take TimeMode. Added to docs.
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********************************************************************************
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*/
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#ifndef SIMPLETZ_H
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#define SIMPLETZ_H
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#include "timezone.h"
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struct StandardZone;
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struct DSTZone;
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/**
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* <code>SimpleTimeZone</code> is a concrete subclass of <code>TimeZone</code>
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* that represents a time zone for use with a Gregorian calendar. This
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* class does not handle historical changes.
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* <P>
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* When specifying daylight-savings-time begin and end dates, use a negative value for
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* <code>dayOfWeekInMonth</code> to indicate that <code>SimpleTimeZone</code> should
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* count from the end of the month backwards. For example, in the U.S., Daylight Savings
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* Time ends at the last (dayOfWeekInMonth = -1) Sunday in October, at 2 AM in standard
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* time.
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*
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* @see Calendar
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* @see GregorianCalendar
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* @see TimeZone
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* @author David Goldsmith, Mark Davis, Chen-Lieh Huang, Alan Liu
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*/
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class U_I18N_API SimpleTimeZone: public TimeZone {
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public:
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/**
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* TimeMode is used, together with a millisecond offset after
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* midnight, to specify a rule transition time. Most rules
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* transition at a local wall time, that is, according to the
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* current time in effect, either standard, or DST. However, some
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* rules transition at local standard time, and some at a specific
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* UTC time. Although it might seem that all times could be
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* converted to wall time, thus eliminating the need for this
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* parameter, this is not the case.
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*/
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enum TimeMode {
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WALL_TIME = 0,
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STANDARD_TIME,
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UTC_TIME
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};
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/**
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* Copy constructor
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*/
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SimpleTimeZone(const SimpleTimeZone& source);
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/**
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* Default assignment operator
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*/
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SimpleTimeZone& operator=(const SimpleTimeZone& right);
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/**
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* Destructor
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*/
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virtual ~SimpleTimeZone();
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/**
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* Returns true if the two TimeZone objects are equal; that is, they have
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* the same ID, raw GMT offset, and DST rules.
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*
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* @param that The SimpleTimeZone object to be compared with.
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* @return True if the given time zone is equal to this time zone; false
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* otherwise.
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*/
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virtual bool_t operator==(const TimeZone& that) const;
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/**
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* Constructs a SimpleTimeZone with the given raw GMT offset and time zone ID,
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* and which doesn't observe daylight savings time. Normally you should use
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* TimeZone::createInstance() to create a TimeZone instead of creating a
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* SimpleTimeZone directly with this constructor.
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*
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* @param rawOffset The given base time zone offset to GMT.
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* @param ID The timezone ID which is obtained from
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* TimeZone.getAvailableIDs.
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*/
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SimpleTimeZone(int32_t rawOffset, const UnicodeString& ID);
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/**
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* Construct a SimpleTimeZone with the given raw GMT offset, time zone ID,
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* and times to start and end daylight savings time. To create a TimeZone that
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* doesn't observe daylight savings time, don't use this constructor; use
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* SimpleTimeZone(rawOffset, ID) instead. Normally, you should use
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* TimeZone.createInstance() to create a TimeZone instead of creating a
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* SimpleTimeZone directly with this constructor.
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* <P>
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* Various types of daylight-savings time rules can be specfied by using different
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* values for startDay and startDayOfWeek and endDay and endDayOfWeek. For a
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* complete explanation of how these parameters work, see the documentation for
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* setStartRule().
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*
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* @param rawOffset The new SimpleTimeZone's raw GMT offset
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* @param ID The new SimpleTimeZone's time zone ID.
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* @param startMonth The daylight savings starting month. Month is
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* 0-based. eg, 0 for January.
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* @param startDay The daylight savings starting
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* day-of-week-in-month. See setStartRule() for a
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* complete explanation.
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* @param startDayOfWeek The daylight savings starting day-of-week. See setStartRule()
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* for a complete explanation.
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* @param startTime The daylight savings starting time, expressed as the
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* number of milliseconds after midnight.
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* @param startTimeMode Whether the start time is local wall time, local
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* standard time, or UTC time. Default is local wall time.
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* @param endMonth The daylight savings ending month. Month is
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* 0-based. eg, 0 for January.
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* @param endDay The daylight savings ending day-of-week-in-month.
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* See setStartRule() for a complete explanation.
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* @param endDayOfWeek The daylight savings ending day-of-week. See setStartRule()
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* for a complete explanation.
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* @param endTime The daylight savings ending time, expressed as the
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* number of milliseconds after midnight.
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* @param endTimeMode Whether the end time is local wall time, local
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* standard time, or UTC time. Default is local wall time.
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* @param dstSavings The number of milliseconds added to standard time
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* to get DST time. Default is one hour.
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* @param status An UErrorCode to receive the status.
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*/
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SimpleTimeZone(int32_t rawOffset, const UnicodeString& ID,
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int8_t startMonth, int8_t startDayOfWeekInMonth,
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int8_t startDayOfWeek, int32_t startTime,
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int8_t endMonth, int8_t endDayOfWeekInMonth,
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int8_t endDayOfWeek, int32_t endTime,
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UErrorCode& status);
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SimpleTimeZone(int32_t rawOffset, const UnicodeString& ID,
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int8_t startMonth, int8_t startDayOfWeekInMonth,
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int8_t startDayOfWeek, int32_t startTime,
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int8_t endMonth, int8_t endDayOfWeekInMonth,
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int8_t endDayOfWeek, int32_t endTime,
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int32_t dstSavings, UErrorCode& status);
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SimpleTimeZone(int32_t rawOffset, const UnicodeString& ID,
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int8_t startMonth, int8_t startDayOfWeekInMonth,
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int8_t startDayOfWeek, int32_t startTime, TimeMode startTimeMode,
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int8_t endMonth, int8_t endDayOfWeekInMonth,
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int8_t endDayOfWeek, int32_t endTime, TimeMode endTimeMode,
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int32_t dstSavings, UErrorCode& status);
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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 setStartYear(int32_t year);
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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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* @param mode whether the time is local wall time, local standard time,
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* or UTC time. Default is local wall time.
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* @param status An UErrorCode
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*/
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void setStartRule(int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek,
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int32_t time, UErrorCode& status);
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void 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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* Sets the DST start rule to a fixed date within a month.
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*
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* @param month The month in which this rule occurs (0-based).
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* @param dayOfMonth The date in that month (1-based).
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* @param time The time of that day (number of millis after midnight)
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* when DST takes effect in local wall time, which is
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* standard time in this case.
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* @param mode whether the time is local wall time, local standard time,
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* or UTC time. Default is local wall time.
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* @param status An UErrorCode
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*/
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void setStartRule(int32_t month, int32_t dayOfMonth, int32_t time,
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UErrorCode& status);
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void setStartRule(int32_t month, int32_t dayOfMonth, int32_t time,
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TimeMode mode, UErrorCode& status);
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/**
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* Sets the DST start rule to a weekday before or after a give date within
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* a month, e.g., the first Monday on or after the 8th.
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*
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* @param month The month in which this rule occurs (0-based).
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* @param dayOfMonth A date within that month (1-based).
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* @param dayOfWeek The day of the week on which this rule occurs.
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* @param time The time of that day (number of millis after midnight)
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* when DST takes effect in local wall time, which is
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* standard time in this case.
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* @param mode whether the time is local wall time, local standard time,
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* or UTC time. Default is local wall time.
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* @param after If true, this rule selects the first dayOfWeek on
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* or after dayOfMonth. If false, this rule selects
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* the last dayOfWeek on or before dayOfMonth.
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* @param status An UErrorCode
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*/
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void setStartRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
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int32_t time, bool_t after, UErrorCode& status);
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void setStartRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
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int32_t time, TimeMode mode, bool_t after, UErrorCode& status);
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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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* <pre>
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* . setEndRule(TimeFields.OCTOBER, -1, TimeFields.SUNDAY, 2*60*60*1000);
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* </pre>
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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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*
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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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* @param mode whether the time is local wall time, local standard time,
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* or UTC time. Default is local wall time.
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* @param status An UErrorCode
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*/
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void setEndRule(int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek,
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int32_t time, UErrorCode& status);
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void 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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* Sets the DST end rule to a fixed date within a month.
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*
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* @param month The month in which this rule occurs (0-based).
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* @param dayOfMonth The date in that month (1-based).
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* @param time The time of that day (number of millis after midnight)
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* when DST ends in local wall time, which is daylight
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* time in this case.
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* @param mode whether the time is local wall time, local standard time,
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* or UTC time. Default is local wall time.
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* @param status An UErrorCode
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*/
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void setEndRule(int32_t month, int32_t dayOfMonth, int32_t time, UErrorCode& status);
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void setEndRule(int32_t month, int32_t dayOfMonth, int32_t time,
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TimeMode mode, UErrorCode& status);
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/**
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* Sets the DST end rule to a weekday before or after a give date within
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* a month, e.g., the first Monday on or after the 8th.
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*
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* @param month The month in which this rule occurs (0-based).
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* @param dayOfMonth A date within that month (1-based).
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* @param dayOfWeek The day of the week on which this rule occurs.
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* @param time The time of that day (number of millis after midnight)
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* when DST ends in local wall time, which is daylight
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* time in this case.
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* @param mode whether the time is local wall time, local standard time,
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* or UTC time. Default is local wall time.
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* @param after If true, this rule selects the first dayOfWeek on
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* or after dayOfMonth. If false, this rule selects
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* the last dayOfWeek on or before dayOfMonth.
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* @param status An UErrorCode
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*/
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void setEndRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
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int32_t time, bool_t after, UErrorCode& status);
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void setEndRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
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int32_t time, TimeMode mode, bool_t after, UErrorCode& status);
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/**
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* Returns the TimeZone's adjusted GMT offset (i.e., the number of milliseconds to add
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* to GMT to get local time in this time zone, taking daylight savings time into
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* account) as of a particular reference date. The reference date is used to determine
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* whether daylight savings time is in effect and needs to be figured into the offset
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* that is returned (in other words, what is the adjusted GMT offset in this time zone
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* at this particular date and time?). For the time zones produced by createTimeZone(),
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* the reference data is specified according to the Gregorian calendar, and the date
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* and time fields are in GMT, NOT local time.
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*
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* @param era The reference date's era
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* @param year The reference date's year
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* @param month The reference date's month (0-based; 0 is January)
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* @param day The reference date's day-in-month (1-based)
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* @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday)
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* @param millis The reference date's milliseconds in day, UTT (NOT local time).
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* @return The offset in milliseconds to add to GMT to get local time.
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*/
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virtual int32_t 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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virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
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uint8_t dayOfWeek, int32_t millis) const;
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/**
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* Gets the time zone offset, for current date, modified in case of
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* daylight savings. This is the offset to add *to* UTC to get local time.
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* @param era the era of the given date.
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* @param year the year in the given date.
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* @param month the month in the given date.
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* Month is 0-based. e.g., 0 for January.
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* @param day the day-in-month of the given date.
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* @param dayOfWeek the day-of-week of the given date.
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* @param milliseconds the millis in day in <em>standard</em> local time.
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* @param monthLength the length of the given month in days.
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* @param prevMonthLength length of the previous month in days.
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* @return the offset to add *to* GMT to get local time.
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*/
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virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
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uint8_t dayOfWeek, int32_t milliseconds,
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int32_t monthLength, UErrorCode& status) const;
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virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
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uint8_t dayOfWeek, int32_t milliseconds,
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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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* Returns the TimeZone's raw GMT offset (i.e., the number of milliseconds to add
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* to GMT to get local time, before taking daylight savings time into account).
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*
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* @return The TimeZone's raw GMT offset.
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*/
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virtual int32_t getRawOffset(void) const;
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/**
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* Sets the TimeZone's raw GMT offset (i.e., the number of milliseconds to add
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* to GMT to get local time, before taking daylight savings time into account).
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*
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* @param offsetMillis The new raw GMT offset for this time zone.
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*/
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virtual void setRawOffset(int32_t offsetMillis);
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/**
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* Sets the amount of time in ms that the clock is advanced during DST.
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* @param millisSavedDuringDST the number of milliseconds the time is
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* advanced with respect to standard time when the daylight savings rules
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* are in effect. A positive number, typically one hour (3600000).
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*/
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void setDSTSavings(int32_t millisSavedDuringDST, UErrorCode& status);
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// deprecated
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void setDSTSavings(int32_t millisSavedDuringDST);
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/**
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* Returns the amount of time in ms that the clock is advanced during DST.
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* @return the number of milliseconds the time is
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* advanced with respect to standard time when the daylight savings rules
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* are in effect. A positive number, typically one hour (3600000).
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*/
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int32_t getDSTSavings(void) const;
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/**
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* Queries if this TimeZone uses Daylight Savings Time.
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*
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* @return True if this TimeZone uses Daylight Savings Time; false otherwise.
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*/
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virtual bool_t useDaylightTime(void) const;
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/**
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* Returns true if the given date is within the period when daylight savings time
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* is in effect; false otherwise. If the TimeZone doesn't observe daylight savings
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* time, this functions always returns false.
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* @param date The date to test.
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* @return true if the given date is in Daylight Savings Time;
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* false otherwise.
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*/
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virtual bool_t inDaylightTime(UDate date, UErrorCode& status) const;
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/**
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* Return true if this zone has the same rules and offset as another zone.
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* @param other the TimeZone object to be compared with
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* @return true if the given zone has the same rules and offset as this one
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*/
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bool_t hasSameRules(const TimeZone& other) const;
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/**
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* Clones TimeZone objects polymorphically. Clients are responsible for deleting
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* the TimeZone object cloned.
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*
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* @return A new copy of this TimeZone object.
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*/
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virtual TimeZone* clone(void) const;
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public:
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/**
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* Override TimeZone Returns a unique class ID POLYMORPHICALLY. Pure virtual
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* override. This method is to implement a simple version of RTTI, since not all C++
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* compilers support genuine RTTI. Polymorphic operator==() and clone() methods call
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* this method.
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*
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* @return The class ID for this object. All objects of a given class have the
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* same class ID. Objects of other classes have different class IDs.
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*/
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virtual UClassID getDynamicClassID(void) const { return (UClassID)&fgClassID; }
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/**
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* Return the class ID for this class. This is useful only for comparing to a return
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* value from getDynamicClassID(). For example:
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* <pre>
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* . Base* polymorphic_pointer = createPolymorphicObject();
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* . if (polymorphic_pointer->getDynamicClassID() ==
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* . Derived::getStaticClassID()) ...
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* </pre>
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* @return The class ID for all objects of this class.
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*/
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static UClassID getStaticClassID(void) { return (UClassID)&fgClassID; }
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private:
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/**
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* Constants specifying values of startMode and endMode.
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*/
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enum EMode
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{
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DOM_MODE = 1,
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DOW_IN_MONTH_MODE,
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DOW_GE_DOM_MODE,
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DOW_LE_DOM_MODE
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};
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friend class TimeZone; // for access to these 2 constructors:
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/**
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* Construct from memory-mapped data.
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*/
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SimpleTimeZone(const StandardZone& stdZone, const UnicodeString& id);
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SimpleTimeZone(const DSTZone& dstZone, const UnicodeString& id);
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/**
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* Internal construction method.
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*/
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void construct(int32_t rawOffset, const UnicodeString& ID,
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int8_t startMonth, int8_t startDay, int8_t startDayOfWeek,
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int32_t startTime, TimeMode startTimeMode,
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int8_t endMonth, int8_t endDay, int8_t endDayOfWeek,
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int32_t endTime, TimeMode endTimeMode,
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int32_t dstSavings, UErrorCode& status);
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/**
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* Compare a given date in the year to a rule. Return 1, 0, or -1, depending
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* on whether the date is after, equal to, or before the rule date. The
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* millis are compared directly against the ruleMillis, so any
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* standard-daylight adjustments must be handled by the caller.
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*
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* @return 1 if the date is after the rule date, -1 if the date is before
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* the rule date, or 0 if the date is equal to the rule date.
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*/
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static int32_t compareToRule(int8_t month, int8_t monthLen, int8_t prevMonthLen,
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int8_t dayOfMonth,
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int8_t dayOfWeek, int32_t millis, int32_t millisDelta,
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EMode ruleMode, int8_t ruleMonth, int8_t ruleDayOfWeek,
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int8_t ruleDay, int32_t ruleMillis);
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/**
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* Given a set of encoded rules in startDay and startDayOfMonth, decode
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* them and set the startMode appropriately. Do the same for endDay and
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* endDayOfMonth.
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* <P>
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* Upon entry, the day of week variables may be zero or
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* negative, in order to indicate special modes. The day of month
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* variables may also be negative.
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* <P>
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* Upon exit, the mode variables will be
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* set, and the day of week and day of month variables will be positive.
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* <P>
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* This method also recognizes a startDay or endDay of zero as indicating
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* no DST.
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*/
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void decodeRules(UErrorCode& status);
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void decodeStartRule(UErrorCode& status);
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void decodeEndRule(UErrorCode& status);
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|
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static char fgClassID;
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int8_t startMonth, startDay, startDayOfWeek; // the month, day, DOW, and time DST starts
|
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int32_t startTime;
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TimeMode startTimeMode, endTimeMode; // Mode for startTime, endTime; see TimeMode
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int8_t endMonth, endDay, endDayOfWeek; // the month, day, DOW, and time DST ends
|
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int32_t endTime;
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int32_t startYear; // the year these DST rules took effect
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int32_t rawOffset; // the TimeZone's raw GMT offset
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bool_t useDaylight; // flag indicating whether this TimeZone uses DST
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static const int8_t staticMonthLength[12]; // lengths of the months
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EMode startMode, endMode; // flags indicating what kind of rules the DST rules are
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/**
|
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* A positive value indicating the amount of time saved during DST in ms.
|
|
* Typically one hour; sometimes 30 minutes.
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|
*/
|
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int32_t dstSavings;
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};
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inline void SimpleTimeZone::setStartRule(int32_t month, int32_t dayOfWeekInMonth,
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int32_t dayOfWeek,
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int32_t time, UErrorCode& status) {
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setStartRule(month, dayOfWeekInMonth, dayOfWeek, time, WALL_TIME, status);
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}
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inline void SimpleTimeZone::setStartRule(int32_t month, int32_t dayOfMonth,
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|
int32_t time,
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UErrorCode& status) {
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setStartRule(month, dayOfMonth, time, WALL_TIME, status);
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}
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inline void SimpleTimeZone::setStartRule(int32_t month, int32_t dayOfMonth,
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|
int32_t dayOfWeek,
|
|
int32_t time, bool_t after, UErrorCode& status) {
|
|
setStartRule(month, dayOfMonth, dayOfWeek, time, WALL_TIME, after, status);
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}
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inline void SimpleTimeZone::setEndRule(int32_t month, int32_t dayOfWeekInMonth,
|
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int32_t dayOfWeek,
|
|
int32_t time, UErrorCode& status) {
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setEndRule(month, dayOfWeekInMonth, dayOfWeek, time, WALL_TIME, status);
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}
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|
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inline void SimpleTimeZone::setEndRule(int32_t month, int32_t dayOfMonth,
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|
int32_t time, UErrorCode& status) {
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|
setEndRule(month, dayOfMonth, time, WALL_TIME, status);
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|
}
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|
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inline void SimpleTimeZone::setEndRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
|
|
int32_t time, bool_t after, UErrorCode& status) {
|
|
setEndRule(month, dayOfMonth, dayOfWeek, time, WALL_TIME, after, status);
|
|
}
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#endif // _SIMPLETZ
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