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-// © 2016 and later: Unicode, Inc. and others.
-// License & terms of use: http://www.unicode.org/copyright.html
-/*
- ********************************************************************************
- * Copyright (C) 2003-2013, International Business Machines Corporation
- * and others. All Rights Reserved.
- ******************************************************************************
- *
- * File ISLAMCAL.H
- *
- * Modification History:
- *
- * Date Name Description
- * 10/14/2003 srl ported from java IslamicCalendar
- *****************************************************************************
- */
-
-#ifndef ISLAMCAL_H
-#define ISLAMCAL_H
-
-#include "unicode/utypes.h"
-
-#if !UCONFIG_NO_FORMATTING
-
-#include "unicode/calendar.h"
-
-U_NAMESPACE_BEGIN
-
-/**
- * <code>IslamicCalendar</code> is a subclass of <code>Calendar</code>
- * that implements the Islamic civil and religious calendars. It
- * is used as the civil calendar in most of the Arab world and the
- * liturgical calendar of the Islamic faith worldwide. This calendar
- * is also known as the "Hijri" calendar, since it starts at the time
- * of Mohammed's emigration (or "hijra") to Medinah on Thursday,
- * July 15, 622 AD (Julian).
- * <p>
- * The Islamic calendar is strictly lunar, and thus an Islamic year of twelve
- * lunar months does not correspond to the solar year used by most other
- * calendar systems, including the Gregorian. An Islamic year is, on average,
- * about 354 days long, so each successive Islamic year starts about 11 days
- * earlier in the corresponding Gregorian year.
- * <p>
- * Each month of the calendar starts when the new moon's crescent is visible
- * at sunset. However, in order to keep the time fields in this class
- * synchronized with those of the other calendars and with local clock time,
- * we treat days and months as beginning at midnight,
- * roughly 6 hours after the corresponding sunset.
- * <p>
- * There are two main variants of the Islamic calendar in existence. The first
- * is the <em>civil</em> calendar, which uses a fixed cycle of alternating 29-
- * and 30-day months, with a leap day added to the last month of 11 out of
- * every 30 years. This calendar is easily calculated and thus predictable in
- * advance, so it is used as the civil calendar in a number of Arab countries.
- * This is the default behavior of a newly-created <code>IslamicCalendar</code>
- * object.
- * <p>
- * The Islamic <em>religious</em> calendar, however, is based on the <em>observation</em>
- * of the crescent moon. It is thus affected by the position at which the
- * observations are made, seasonal variations in the time of sunset, the
- * eccentricities of the moon's orbit, and even the weather at the observation
- * site. This makes it impossible to calculate in advance, and it causes the
- * start of a month in the religious calendar to differ from the civil calendar
- * by up to three days.
- * <p>
- * Using astronomical calculations for the position of the sun and moon, the
- * moon's illumination, and other factors, it is possible to determine the start
- * of a lunar month with a fairly high degree of certainty. However, these
- * calculations are extremely complicated and thus slow, so most algorithms,
- * including the one used here, are only approximations of the true astronical
- * calculations. At present, the approximations used in this class are fairly
- * simplistic; they will be improved in later versions of the code.
- * <p>
- * The {@link #setCivil setCivil} method determines
- * which approach is used to determine the start of a month. By default, the
- * fixed-cycle civil calendar is used. However, if <code>setCivil(false)</code>
- * is called, an approximation of the true lunar calendar will be used.
- *
- * @see GregorianCalendar
- *
- * @author Laura Werner
- * @author Alan Liu
- * @author Steven R. Loomis
- * @internal
- */
-class U_I18N_API IslamicCalendar : public Calendar {
- public:
- //-------------------------------------------------------------------------
- // Constants...
- //-------------------------------------------------------------------------
-
- /**
- * Calendar type - civil or religious or um alqura
- * @internal
- */
- enum ECalculationType {
- ASTRONOMICAL,
- CIVIL,
- UMALQURA,
- TBLA
- };
-
- /**
- * Constants for the months
- * @internal
- */
- enum EMonths {
- /**
- * Constant for Muharram, the 1st month of the Islamic year.
- * @internal
- */
- MUHARRAM = 0,
-
- /**
- * Constant for Safar, the 2nd month of the Islamic year.
- * @internal
- */
- SAFAR = 1,
-
- /**
- * Constant for Rabi' al-awwal (or Rabi' I), the 3rd month of the Islamic year.
- * @internal
- */
- RABI_1 = 2,
-
- /**
- * Constant for Rabi' al-thani or (Rabi' II), the 4th month of the Islamic year.
- * @internal
- */
- RABI_2 = 3,
-
- /**
- * Constant for Jumada al-awwal or (Jumada I), the 5th month of the Islamic year.
- * @internal
- */
- JUMADA_1 = 4,
-
- /**
- * Constant for Jumada al-thani or (Jumada II), the 6th month of the Islamic year.
- * @internal
- */
- JUMADA_2 = 5,
-
- /**
- * Constant for Rajab, the 7th month of the Islamic year.
- * @internal
- */
- RAJAB = 6,
-
- /**
- * Constant for Sha'ban, the 8th month of the Islamic year.
- * @internal
- */
- SHABAN = 7,
-
- /**
- * Constant for Ramadan, the 9th month of the Islamic year.
- * @internal
- */
- RAMADAN = 8,
-
- /**
- * Constant for Shawwal, the 10th month of the Islamic year.
- * @internal
- */
- SHAWWAL = 9,
-
- /**
- * Constant for Dhu al-Qi'dah, the 11th month of the Islamic year.
- * @internal
- */
- DHU_AL_QIDAH = 10,
-
- /**
- * Constant for Dhu al-Hijjah, the 12th month of the Islamic year.
- * @internal
- */
- DHU_AL_HIJJAH = 11,
-
- ISLAMIC_MONTH_MAX
- };
-
-
- //-------------------------------------------------------------------------
- // Constructors...
- //-------------------------------------------------------------------------
-
- /**
- * Constructs an IslamicCalendar 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 IslamicCalendar object construction.
- * Returns U_ZERO_ERROR if constructed successfully.
- * @param type The Islamic calendar calculation type. The default value is CIVIL.
- * @internal
- */
- IslamicCalendar(const Locale& aLocale, UErrorCode &success, ECalculationType type = CIVIL);
-
- /**
- * Copy Constructor
- * @internal
- */
- IslamicCalendar(const IslamicCalendar& other);
-
- /**
- * Destructor.
- * @internal
- */
- virtual ~IslamicCalendar();
-
- /**
- * Sets Islamic calendar calculation type used by this instance.
- *
- * @param type The calendar calculation type, <code>CIVIL</code> to use the civil
- * calendar, <code>ASTRONOMICAL</code> to use the astronomical calendar.
- * @internal
- */
- void setCalculationType(ECalculationType type, UErrorCode &status);
-
- /**
- * Returns <code>true</code> if this object is using the fixed-cycle civil
- * calendar, or <code>false</code> if using the religious, astronomical
- * calendar.
- * @internal
- */
- UBool isCivil();
-
-
- // TODO: copy c'tor, etc
-
- // clone
- virtual Calendar* clone() const;
-
- private:
- /**
- * Determine whether a year is a leap year in the Islamic civil calendar
- */
- static UBool civilLeapYear(int32_t year);
-
- /**
- * Return the day # on which the given year starts. Days are counted
- * from the Hijri epoch, origin 0.
- */
- int32_t yearStart(int32_t year) const;
-
- /**
- * Return the day # on which the given month starts. Days are counted
- * from the Hijri epoch, origin 0.
- *
- * @param year The hijri year
- * @param year The hijri month, 0-based
- */
- int32_t monthStart(int32_t year, int32_t month) const;
-
- /**
- * Find the day number on which a particular month of the true/lunar
- * Islamic calendar starts.
- *
- * @param month The month in question, origin 0 from the Hijri epoch
- *
- * @return The day number on which the given month starts.
- */
- int32_t trueMonthStart(int32_t month) const;
-
- /**
- * Return the "age" of the moon at the given time; this is the difference
- * in ecliptic latitude between the moon and the sun. This method simply
- * calls CalendarAstronomer.moonAge, converts to degrees,
- * and adjusts the resultto be in the range [-180, 180].
- *
- * @param time The time at which the moon's age is desired,
- * in millis since 1/1/1970.
- */
- static double moonAge(UDate time, UErrorCode &status);
-
- //-------------------------------------------------------------------------
- // Internal data....
- //
-
- /**
- * <code>CIVIL</code> if this object uses the fixed-cycle Islamic civil calendar,
- * and <code>ASTRONOMICAL</code> if it approximates the true religious calendar using
- * astronomical calculations for the time of the new moon.
- */
- ECalculationType cType;
-
- //----------------------------------------------------------------------
- // Calendar framework
- //----------------------------------------------------------------------
- protected:
- /**
- * @internal
- */
- virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) const;
-
- /**
- * Return the length (in days) of the given month.
- *
- * @param year The hijri year
- * @param year The hijri month, 0-based
- * @internal
- */
- virtual int32_t handleGetMonthLength(int32_t extendedYear, int32_t month) const;
-
- /**
- * Return the number of days in the given Islamic year
- * @internal
- */
- virtual int32_t handleGetYearLength(int32_t extendedYear) const;
-
- //-------------------------------------------------------------------------
- // Functions for converting from field values to milliseconds....
- //-------------------------------------------------------------------------
-
- // Return JD of start of given month/year
- /**
- * @internal
- */
- virtual int32_t handleComputeMonthStart(int32_t eyear, int32_t month, UBool useMonth) const;
-
- //-------------------------------------------------------------------------
- // Functions for converting from milliseconds to field values
- //-------------------------------------------------------------------------
-
- /**
- * @internal
- */
- virtual int32_t handleGetExtendedYear();
-
- /**
- * Override Calendar to compute several fields specific to the Islamic
- * calendar system. These are:
- *
- * <ul><li>ERA
- * <li>YEAR
- * <li>MONTH
- * <li>DAY_OF_MONTH
- * <li>DAY_OF_YEAR
- * <li>EXTENDED_YEAR</ul>
- *
- * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
- * method is called. The getGregorianXxx() methods return Gregorian
- * calendar equivalents for the given Julian day.
- * @internal
- */
- virtual void handleComputeFields(int32_t julianDay, UErrorCode &status);
-
- // UObject stuff
- public:
- /**
- * @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(void) const;
-
- /**
- * 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
- */
- /*U_I18N_API*/ static UClassID U_EXPORT2 getStaticClassID(void);
-
- /**
- * return the calendar type, "buddhist".
- *
- * @return calendar type
- * @internal
- */
- virtual const char * getType() const;
-
- private:
- IslamicCalendar(); // default constructor not implemented
-
- // Default century.
- protected:
-
- /**
- * (Overrides Calendar) Return true if the current date for this Calendar is in
- * Daylight Savings Time. Recognizes DST_OFFSET, if it is set.
- *
- * @param status Fill-in parameter which receives the status of this operation.
- * @return True if the current date for this Calendar is in Daylight Savings Time,
- * false, otherwise.
- * @internal
- */
- virtual UBool inDaylightTime(UErrorCode& status) const;
-
-
- /**
- * Returns TRUE because the Islamic Calendar does have a default century
- * @internal
- */
- virtual UBool haveDefaultCentury() const;
-
- /**
- * Returns the date of the start of the default century
- * @return start of century - in milliseconds since epoch, 1970
- * @internal
- */
- virtual UDate defaultCenturyStart() const;
-
- /**
- * Returns the year in which the default century begins
- * @internal
- */
- virtual int32_t defaultCenturyStartYear() const;
-
- private:
- /**
- * Initializes the 100-year window that dates with 2-digit years
- * are considered to fall within so that its start date is 80 years
- * before the current time.
- */
- static void U_CALLCONV initializeSystemDefaultCentury(void);
-};
-
-U_NAMESPACE_END
-
-#endif
-#endif