зеркало из https://github.com/mozilla/gecko-dev.git
363 строки
16 KiB
C++
363 строки
16 KiB
C++
/*
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********************************************************************************
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* *
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* COPYRIGHT: *
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* (C) Copyright Taligent, Inc., 1997 *
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* (C) Copyright International Business Machines Corporation, 1997 *
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* Licensed Material - Program-Property of IBM - All Rights Reserved. *
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* US Government Users Restricted Rights - Use, duplication, or disclosure *
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* restricted by GSA ADP Schedule Contract with IBM Corp. *
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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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********************************************************************************
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*/
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#ifndef _SIMPLETZ
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#define _SIMPLETZ
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#include "timezone.h"
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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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* @version 1.24 10/30/97
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* @author David Goldsmith, Mark Davis, Chen-Lieh Huang, Alan Liu
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*/
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#ifdef NLS_MAC
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#pragma export on
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#endif
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class T_FORMAT_API SimpleTimeZone: public TimeZone {
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public:
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/**
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* Need default constructor for some UNIX platforms
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*/
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SimpleTimeZone(void);
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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 t_bool 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(t_int32 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 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 dstSavings The number of milliseconds to add to the raw GMT offset
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* when daylight savings time is in effect. (e.g., in the
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* U.S. daylight savings time shifts the time forward one
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* hour.) Defaults to plus one hour.
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*/
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SimpleTimeZone(t_int32 rawOffset, const UnicodeString& ID,
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t_int8 startMonth, t_int8 startDayOfWeekInMonth,
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t_int8 startDayOfWeek, t_int32 startTime,
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t_int8 endMonth, t_int8 endDayOfWeekInMonth,
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t_int8 endDayOfWeek, t_int32 endTime,
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t_int32 dstSavings = kMillisPerHour);
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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(t_int32 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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*/
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void setStartRule(int month, int dayOfWeekInMonth, int dayOfWeek,
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t_int32 time);
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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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*/
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void setEndRule(int month, int dayOfWeekInMonth, int dayOfWeek,
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t_int32 time);
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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?).
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* <P>
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* 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 t_int32 getOffset(t_uint8 era, t_int32 year, t_int32 month, t_int32 day,
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t_uint8 dayOfWeek, t_int32 millis) 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 t_int32 getRawOffset() 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(t_int32 offsetMillis);
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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 t_bool useDaylightTime() 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 t_bool inDaylightTime(Date date, ErrorCode& status) 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() 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 ClassID getDynamicClassID() const { return (ClassID)&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 ClassID getStaticClassID() { return (ClassID)&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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/**
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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. Assume that
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* no rule references the end of February (e.g., last Sunday in February).
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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 int compareToRule(int month, int dayOfMonth, int dayOfWeek, t_int32 millis,
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EMode ruleMode, int ruleMonth, int ruleDayOfWeek,
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int ruleDay, t_int32 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();
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static char fgClassID;
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int startMonth, startDay, startDayOfWeek; // the month, day, DOW, and time DST starts
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t_int32 startTime;
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int endMonth, endDay, endDayOfWeek; // the month, day, DOW, and time DST ends
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t_int32 endTime;
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int startYear; // the year these DST rules took effect
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t_int32 rawOffset; // the TimeZone's raw GMT offset
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t_bool useDaylight; // flag indicating whether this TimeZone uses DST
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static t_int32 millisPerHour; // number of millis in an hour
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static const t_uint8 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.
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* Typically one hour; sometimes 30 minutes.
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*/
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t_int32 dstSavings;
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};
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#ifdef NLS_MAC
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#pragma export off
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#endif
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#endif // _SIMPLETZ
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