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716 lines
21 KiB
C++
716 lines
21 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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********************************************************************************
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* Copyright (C) 2003-2013, International Business Machines Corporation
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* and others. All Rights Reserved.
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******************************************************************************
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*
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* File ISLAMCAL.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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* 10/14/2003 srl ported from java IslamicCalendar
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*****************************************************************************
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*/
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#ifndef ISLAMCAL_H
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#define ISLAMCAL_H
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_FORMATTING
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#include "unicode/calendar.h"
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U_NAMESPACE_BEGIN
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/**
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* <code>IslamicCalendar</code> is a subclass of <code>Calendar</code>
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* that implements the Islamic civil and religious calendars. It
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* is used as the civil calendar in most of the Arab world and the
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* liturgical calendar of the Islamic faith worldwide. This calendar
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* is also known as the "Hijri" calendar, since it starts at the time
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* of Mohammed's emigration (or "hijra") to Medinah on Thursday,
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* July 15, 622 AD (Julian).
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* <p>
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* The Islamic calendar is strictly lunar, and thus an Islamic year of twelve
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* lunar months does not correspond to the solar year used by most other
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* calendar systems, including the Gregorian. An Islamic year is, on average,
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* about 354 days long, so each successive Islamic year starts about 11 days
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* earlier in the corresponding Gregorian year.
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* <p>
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* Each month of the calendar starts when the new moon's crescent is visible
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* at sunset. However, in order to keep the time fields in this class
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* synchronized with those of the other calendars and with local clock time,
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* we treat days and months as beginning at midnight,
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* roughly 6 hours after the corresponding sunset.
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* <p>
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* There are two main variants of the Islamic calendar in existence. The first
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* is the <em>civil</em> calendar, which uses a fixed cycle of alternating 29-
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* and 30-day months, with a leap day added to the last month of 11 out of
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* every 30 years. This calendar is easily calculated and thus predictable in
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* advance, so it is used as the civil calendar in a number of Arab countries.
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* This is the default behavior of a newly-created <code>IslamicCalendar</code>
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* object. This calendar variant is implemented in the IslamicCivilCalendar
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* class.
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* <p>
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* The Islamic <em>religious</em> calendar, however, is based on the <em>observation</em>
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* of the crescent moon. It is thus affected by the position at which the
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* observations are made, seasonal variations in the time of sunset, the
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* eccentricities of the moon's orbit, and even the weather at the observation
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* site. This makes it impossible to calculate in advance, and it causes the
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* start of a month in the religious calendar to differ from the civil calendar
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* by up to three days.
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* <p>
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* Using astronomical calculations for the position of the sun and moon, the
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* moon's illumination, and other factors, it is possible to determine the start
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* of a lunar month with a fairly high degree of certainty. However, these
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* calculations are extremely complicated and thus slow, so most algorithms,
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* including the one used here, are only approximations of the true astronomical
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* calculations. At present, the approximations used in this class are fairly
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* simplistic; they will be improved in later versions of the code.
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* <p>
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*
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* @see GregorianCalendar
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*
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* @author Laura Werner
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* @author Alan Liu
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* @author Steven R. Loomis
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* @internal
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*/
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class U_I18N_API IslamicCalendar : public Calendar {
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public:
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//-------------------------------------------------------------------------
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// Constants...
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//-------------------------------------------------------------------------
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/**
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* Constants for the months
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* @internal
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*/
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enum EMonths {
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/**
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* Constant for Muharram, the 1st month of the Islamic year.
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* @internal
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*/
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MUHARRAM = 0,
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/**
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* Constant for Safar, the 2nd month of the Islamic year.
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* @internal
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*/
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SAFAR = 1,
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/**
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* Constant for Rabi' al-awwal (or Rabi' I), the 3rd month of the Islamic year.
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* @internal
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*/
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RABI_1 = 2,
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/**
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* Constant for Rabi' al-thani or (Rabi' II), the 4th month of the Islamic year.
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* @internal
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*/
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RABI_2 = 3,
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/**
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* Constant for Jumada al-awwal or (Jumada I), the 5th month of the Islamic year.
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* @internal
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*/
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JUMADA_1 = 4,
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/**
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* Constant for Jumada al-thani or (Jumada II), the 6th month of the Islamic year.
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* @internal
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*/
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JUMADA_2 = 5,
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/**
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* Constant for Rajab, the 7th month of the Islamic year.
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* @internal
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*/
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RAJAB = 6,
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/**
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* Constant for Sha'ban, the 8th month of the Islamic year.
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* @internal
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*/
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SHABAN = 7,
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/**
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* Constant for Ramadan, the 9th month of the Islamic year.
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* @internal
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*/
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RAMADAN = 8,
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/**
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* Constant for Shawwal, the 10th month of the Islamic year.
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* @internal
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*/
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SHAWWAL = 9,
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/**
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* Constant for Dhu al-Qi'dah, the 11th month of the Islamic year.
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* @internal
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*/
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DHU_AL_QIDAH = 10,
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/**
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* Constant for Dhu al-Hijjah, the 12th month of the Islamic year.
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* @internal
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*/
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DHU_AL_HIJJAH = 11,
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ISLAMIC_MONTH_MAX
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};
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//-------------------------------------------------------------------------
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// Constructors...
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//-------------------------------------------------------------------------
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/**
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* Constructs an IslamicCalendar based on the current time in the default time zone
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* with the given locale.
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*
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* @param aLocale The given locale.
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* @param success Indicates the status of IslamicCalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @internal
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*/
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IslamicCalendar(const Locale& aLocale, UErrorCode &success);
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/**
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* Copy Constructor
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* @internal
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*/
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IslamicCalendar(const IslamicCalendar& other) = default;
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/**
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* Destructor.
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* @internal
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*/
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virtual ~IslamicCalendar();
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// clone
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virtual IslamicCalendar* clone() const override;
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protected:
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/**
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* Return the day # on which the given year starts. Days are counted
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* from the Hijri epoch, origin 0.
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*/
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virtual int64_t yearStart(int32_t year, UErrorCode& status) const;
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/**
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* Return the day # on which the given month starts. Days are counted
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* from the Hijri epoch, origin 0.
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*
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* @param year The hijri year
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* @param year The hijri month, 0-based
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*/
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virtual int64_t monthStart(int32_t year, int32_t month, UErrorCode& status) const;
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//----------------------------------------------------------------------
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// Calendar framework
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//----------------------------------------------------------------------
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protected:
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/**
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* @internal
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*/
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virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) const override;
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/**
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* Return the length (in days) of the given month.
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*
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* @param year The hijri year
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* @param year The hijri month, 0-based
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* @internal
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*/
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virtual int32_t handleGetMonthLength(int32_t extendedYear, int32_t month, UErrorCode& status) const override;
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/**
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* Return the number of days in the given Islamic year
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* @internal
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*/
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virtual int32_t handleGetYearLength(int32_t extendedYear, UErrorCode& status) const override;
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//-------------------------------------------------------------------------
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// Functions for converting from field values to milliseconds....
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//-------------------------------------------------------------------------
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// Return JD of start of given month/year
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/**
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* @internal
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*/
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virtual int64_t handleComputeMonthStart(int32_t eyear, int32_t month, UBool useMonth, UErrorCode& status) const override;
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//-------------------------------------------------------------------------
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// Functions for converting from milliseconds to field values
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//-------------------------------------------------------------------------
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/**
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* @internal
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*/
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virtual int32_t handleGetExtendedYear(UErrorCode& status) override;
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/**
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* Override Calendar to compute several fields specific to the Islamic
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* calendar system. These are:
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*
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* <ul><li>ERA
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* <li>YEAR
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* <li>MONTH
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* <li>DAY_OF_MONTH
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* <li>DAY_OF_YEAR
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* <li>EXTENDED_YEAR</ul>
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*
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* The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
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* method is called. The getGregorianXxx() methods return Gregorian
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* calendar equivalents for the given Julian day.
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* @internal
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*/
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virtual void handleComputeFields(int32_t julianDay, UErrorCode &status) override;
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/**
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* Return the epoc.
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* @internal
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*/
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virtual int32_t getEpoc() const;
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// UObject stuff
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public:
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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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* @internal
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*/
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virtual UClassID getDynamicClassID() const override;
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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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*
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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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*
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* @return The class ID for all objects of this class.
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* @internal
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*/
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/*U_I18N_API*/ static UClassID U_EXPORT2 getStaticClassID();
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/**
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* return the calendar type, "islamic".
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*
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* @return calendar type
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* @internal
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*/
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virtual const char * getType() const override;
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/**
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* @return The related Gregorian year; will be obtained by modifying the value
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* obtained by get from UCAL_EXTENDED_YEAR field
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* @internal
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*/
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virtual int32_t getRelatedYear(UErrorCode &status) const override;
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/**
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* @param year The related Gregorian year to set; will be modified as necessary then
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* set in UCAL_EXTENDED_YEAR field
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* @internal
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*/
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virtual void setRelatedYear(int32_t year) override;
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/**
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* Returns true if the date is in a leap year.
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*
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* @param status ICU Error Code
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* @return True if the date in the fields is in a Temporal proposal
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* defined leap year. False otherwise.
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*/
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virtual bool inTemporalLeapYear(UErrorCode &status) const override;
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private:
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IslamicCalendar() = delete; // default constructor not implemented
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// Default century.
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protected:
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DECLARE_OVERRIDE_SYSTEM_DEFAULT_CENTURY
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};
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/*
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* IslamicCivilCalendar is one of the two main variants of the Islamic calendar.
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* The <em>civil</em> calendar, which uses a fixed cycle of alternating 29-
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* and 30-day months, with a leap day added to the last month of 11 out of
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* every 30 years. This calendar is easily calculated and thus predictable in
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* advance, so it is used as the civil calendar in a number of Arab countries.
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* This calendar is referring as "Islamic calendar, tabular (intercalary years
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* [2,5,7,10,13,16,18,21,24,26,29]- civil epoch" in CLDR.
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*/
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class U_I18N_API IslamicCivilCalendar : public IslamicCalendar {
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public:
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/**
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* Constructs an IslamicCivilCalendar based on the current time in the default time zone
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* with the given locale.
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*
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* @param aLocale The given locale.
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* @param success Indicates the status of IslamicCivilCalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @internal
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*/
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IslamicCivilCalendar(const Locale& aLocale, UErrorCode &success);
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/**
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* Copy Constructor
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* @internal
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*/
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IslamicCivilCalendar(const IslamicCivilCalendar& other) = default;
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/**
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* Destructor.
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* @internal
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*/
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virtual ~IslamicCivilCalendar();
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// clone
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virtual IslamicCivilCalendar* clone() const override;
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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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* @internal
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*/
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virtual UClassID getDynamicClassID() const override;
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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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*
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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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*
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* @return The class ID for all objects of this class.
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* @internal
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*/
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static UClassID U_EXPORT2 getStaticClassID();
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/**
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* return the calendar type, "islamic-civil".
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*
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* @return calendar type
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* @internal
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*/
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virtual const char * getType() const override;
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protected:
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/**
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* Return the day # on which the given year starts. Days are counted
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* from the Hijri epoch, origin 0.
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* @internal
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*/
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virtual int64_t yearStart(int32_t year, UErrorCode& status) const override;
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/**
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* Return the day # on which the given month starts. Days are counted
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* from the Hijri epoch, origin 0.
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*
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* @param year The hijri year
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* @param year The hijri month, 0-based
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* @internal
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*/
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virtual int64_t monthStart(int32_t year, int32_t month, UErrorCode& status) const override;
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/**
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* Return the length (in days) of the given month.
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*
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* @param year The hijri year
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* @param year The hijri month, 0-based
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* @internal
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*/
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virtual int32_t handleGetMonthLength(int32_t extendedYear, int32_t month, UErrorCode& status) const override;
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/**
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* Return the number of days in the given Islamic year
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* @internal
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*/
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virtual int32_t handleGetYearLength(int32_t extendedYear, UErrorCode& status) const override;
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/**
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* Override Calendar to compute several fields specific to the Islamic
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* calendar system. These are:
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*
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* <ul><li>ERA
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* <li>YEAR
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* <li>MONTH
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* <li>DAY_OF_MONTH
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* <li>DAY_OF_YEAR
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* <li>EXTENDED_YEAR</ul>
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*
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* The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
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* method is called. The getGregorianXxx() methods return Gregorian
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* calendar equivalents for the given Julian day.
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* @internal
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*/
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virtual void handleComputeFields(int32_t julianDay, UErrorCode &status) override;
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};
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/*
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* IslamicTBLACalendar calendar.
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* This is a subclass of IslamicCivilCalendar. The only differences in the
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* calendar math is it uses different epoch.
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* This calendar is referring as "Islamic calendar, tabular (intercalary years
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* [2,5,7,10,13,16,18,21,24,26,29] - astronomical epoch" in CLDR.
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*/
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class U_I18N_API IslamicTBLACalendar : public IslamicCivilCalendar {
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public:
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/**
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* Constructs an IslamicTBLACalendar based on the current time in the default time zone
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* with the given locale.
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*
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* @param aLocale The given locale.
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* @param success Indicates the status of IslamicTBLACalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @internal
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*/
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IslamicTBLACalendar(const Locale& aLocale, UErrorCode &success);
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/**
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* Copy Constructor
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* @internal
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*/
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IslamicTBLACalendar(const IslamicTBLACalendar& other) = default;
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/**
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* Destructor.
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* @internal
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*/
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virtual ~IslamicTBLACalendar();
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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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* @internal
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*/
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virtual UClassID getDynamicClassID() const override;
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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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*
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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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*
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* @return The class ID for all objects of this class.
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* @internal
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*/
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static UClassID U_EXPORT2 getStaticClassID();
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/**
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* return the calendar type, "islamic-tbla".
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*
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* @return calendar type
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* @internal
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*/
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virtual const char * getType() const override;
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// clone
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virtual IslamicTBLACalendar* clone() const override;
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protected:
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/**
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* Return the epoc.
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* @internal
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*/
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virtual int32_t getEpoc() const override;
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};
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/*
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* IslamicUmalquraCalendar
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* This calendar is referred as "Islamic calendar, Umm al-Qura" in CLDR.
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*/
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class U_I18N_API IslamicUmalquraCalendar : public IslamicCivilCalendar {
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public:
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/**
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* Constructs an IslamicUmalquraCalendar based on the current time in the default time zone
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* with the given locale.
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*
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* @param aLocale The given locale.
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* @param success Indicates the status of IslamicUmalquraCalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @internal
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*/
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IslamicUmalquraCalendar(const Locale& aLocale, UErrorCode &success);
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/**
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* Copy Constructor
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* @internal
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*/
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IslamicUmalquraCalendar(const IslamicUmalquraCalendar& other) = default;
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/**
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* Destructor.
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* @internal
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*/
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virtual ~IslamicUmalquraCalendar();
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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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* @internal
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*/
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virtual UClassID getDynamicClassID() const override;
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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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*
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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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*
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* @return The class ID for all objects of this class.
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* @internal
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*/
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static UClassID U_EXPORT2 getStaticClassID();
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/**
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* return the calendar type, "islamic-umalqura".
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*
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* @return calendar type
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* @internal
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*/
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virtual const char * getType() const override;
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// clone
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virtual IslamicUmalquraCalendar* clone() const override;
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protected:
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/**
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* Return the day # on which the given year starts. Days are counted
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* from the Hijri epoch, origin 0.
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* @internal
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*/
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virtual int64_t yearStart(int32_t year, UErrorCode& status) const override;
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/**
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* Return the day # on which the given month starts. Days are counted
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* from the Hijri epoch, origin 0.
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*
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* @param year The hijri year
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* @param year The hijri month, 0-based
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* @internal
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*/
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virtual int64_t monthStart(int32_t year, int32_t month, UErrorCode& status) const override;
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/**
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* Return the length (in days) of the given month.
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*
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* @param year The hijri year
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* @param year The hijri month, 0-based
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* @internal
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*/
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virtual int32_t handleGetMonthLength(int32_t extendedYear, int32_t month, UErrorCode& status) const override;
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/**
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* Return the number of days in the given Islamic year
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* @internal
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*/
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virtual int32_t handleGetYearLength(int32_t extendedYear, UErrorCode& status) const override;
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/**
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* Override Calendar to compute several fields specific to the Islamic
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* calendar system. These are:
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*
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* <ul><li>ERA
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* <li>YEAR
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* <li>MONTH
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* <li>DAY_OF_MONTH
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* <li>DAY_OF_YEAR
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* <li>EXTENDED_YEAR</ul>
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*
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* The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
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* method is called. The getGregorianXxx() methods return Gregorian
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* calendar equivalents for the given Julian day.
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* @internal
|
|
*/
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|
virtual void handleComputeFields(int32_t julianDay, UErrorCode &status) override;
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private:
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|
virtual int32_t yearLength(int32_t extendedYear, UErrorCode& status) const;
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};
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/*
|
|
* IslamicRGSACalendar
|
|
* Islamic calendar, Saudi Arabia sighting. Since the calendar depends on the
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* sighting, it is impossible to implement by algorithm ahead of time. It is
|
|
* currently identical to IslamicCalendar except the getType will return
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* "islamic-rgsa".
|
|
*/
|
|
class U_I18N_API IslamicRGSACalendar : public IslamicCalendar {
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|
public:
|
|
/**
|
|
* Constructs an IslamicRGSACalendar based on the current time in the default time zone
|
|
* with the given locale.
|
|
*
|
|
* @param aLocale The given locale.
|
|
* @param success Indicates the status of IslamicRGSACalendar object construction.
|
|
* Returns U_ZERO_ERROR if constructed successfully.
|
|
* @internal
|
|
*/
|
|
IslamicRGSACalendar(const Locale& aLocale, UErrorCode &success);
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|
|
|
/**
|
|
* Copy Constructor
|
|
* @internal
|
|
*/
|
|
IslamicRGSACalendar(const IslamicRGSACalendar& other) = default;
|
|
|
|
/**
|
|
* Destructor.
|
|
* @internal
|
|
*/
|
|
virtual ~IslamicRGSACalendar();
|
|
|
|
/**
|
|
* @return The class ID for this object. All objects of a given class have the
|
|
* same class ID. Objects of other classes have different class IDs.
|
|
* @internal
|
|
*/
|
|
virtual UClassID getDynamicClassID() const override;
|
|
|
|
/**
|
|
* Return the class ID for this class. This is useful only for comparing to a return
|
|
* value from getDynamicClassID(). For example:
|
|
*
|
|
* Base* polymorphic_pointer = createPolymorphicObject();
|
|
* if (polymorphic_pointer->getDynamicClassID() ==
|
|
* Derived::getStaticClassID()) ...
|
|
*
|
|
* @return The class ID for all objects of this class.
|
|
* @internal
|
|
*/
|
|
static UClassID U_EXPORT2 getStaticClassID();
|
|
|
|
/**
|
|
* return the calendar type, "islamic-rgsa".
|
|
*
|
|
* @return calendar type
|
|
* @internal
|
|
*/
|
|
virtual const char * getType() const override;
|
|
|
|
// clone
|
|
virtual IslamicRGSACalendar* clone() const override;
|
|
};
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif
|
|
#endif
|