373 lines
11 KiB
C++
373 lines
11 KiB
C++
/*
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*****************************************************************************
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* Copyright (C) 2003-2008, 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 INDIANCAL.H
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*****************************************************************************
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*/
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#ifndef INDIANCAL_H
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#define INDIANCAL_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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* Concrete class which provides the Indian calendar.
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* <P>
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* <code>IndianCalendar</code> is a subclass of <code>Calendar</code>
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* that numbers years since the begining of SAKA ERA. This is the civil calendar
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* which is accepted by government of India as Indian National Calendar.
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* The two calendars most widely used in India today are the Vikrama calendar
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* followed in North India and the Shalivahana or Saka calendar which is followed
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* in South India and Maharashtra.
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* A variant of the Shalivahana Calendar was reformed and standardized as the
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* Indian National calendar in 1957.
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* <p>
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* Some details of Indian National Calendar (to be implemented) :
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* The Months
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* Month Length Start date (Gregorian)
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* =================================================
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* 1 Chaitra 30/31 March 22*
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* 2 Vaisakha 31 April 21
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* 3 Jyaistha 31 May 22
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* 4 Asadha 31 June 22
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* 5 Sravana 31 July 23
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* 6 Bhadra 31 August 23
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* 7 Asvina 30 September 23
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* 8 Kartika 30 October 23
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* 9 Agrahayana 30 November 22
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* 10 Pausa 30 December 22
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* 11 Magha 30 January 21
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* 12 Phalguna 30 February 20
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* In leap years, Chaitra has 31 days and starts on March 21 instead.
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* The leap years of Gregorian calendar and Indian National Calendar are in synchornization.
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* So When its a leap year in Gregorian calendar then Chaitra has 31 days.
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*
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* The Years
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* Years are counted in the Saka Era, which starts its year 0 in 78AD (by gregorian calendar).
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* So for eg. 9th June 2006 by Gregorian Calendar, is same as 19th of Jyaistha in 1928 of Saka
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* era by Indian National Calendar.
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* <p>
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* The Indian Calendar has only one allowable era: <code>Saka Era</code>. If the
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* calendar is not in lenient mode (see <code>setLenient</code>), dates before
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* 1/1/1 Saka Era are rejected with an <code>IllegalArgumentException</code>.
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* <p>
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* @internal
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*/
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class IndianCalendar : public Calendar {
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public:
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/**
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* Useful constants for IndianCalendar.
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* @internal
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*/
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enum EEras {
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/**
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* Constant for Chaitra, the 1st month of the Indian year.
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*/
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CHAITRA,
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/**
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* Constant for Vaisakha, the 2nd month of the Indian year.
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*/
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VAISAKHA,
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/**
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* Constant for Jyaistha, the 3rd month of the Indian year.
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*/
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JYAISTHA,
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/**
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* Constant for Asadha, the 4th month of the Indian year.
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*/
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ASADHA,
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/**
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* Constant for Sravana, the 5th month of the Indian year.
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*/
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SRAVANA,
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/**
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* Constant for Bhadra the 6th month of the Indian year
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*/
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BHADRA,
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/**
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* Constant for the Asvina, the 7th month of the Indian year.
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*/
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ASVINA,
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/**
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* Constant for Kartika, the 8th month of the Indian year.
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*/
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KARTIKA,
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/**
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* Constant for Agrahayana, the 9th month of the Indian year.
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*/
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AGRAHAYANA,
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/**
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* Constant for Pausa, the 10th month of the Indian year.
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*/
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PAUSA,
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/**
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* Constant for Magha, the 11th month of the Indian year.
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*/
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MAGHA,
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/**
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* Constant for Phalguna, the 12th month of the Indian year.
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*/
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PHALGUNA
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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 IndianCalendar 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 IndianCalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @param beCivil Whether the calendar should be civil (default-TRUE) or religious (FALSE)
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* @internal
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*/
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IndianCalendar(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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IndianCalendar(const IndianCalendar& other);
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/**
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* Destructor.
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* @internal
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*/
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virtual ~IndianCalendar();
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/**
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* Determines whether this object uses the fixed-cycle Indian civil calendar
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* or an approximation of the religious, astronomical calendar.
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*
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* @param beCivil <code>CIVIL</code> to use the civil calendar,
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* <code>ASTRONOMICAL</code> to use the astronomical calendar.
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* @internal
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*/
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//void setCivil(ECivil beCivil, UErrorCode &status);
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/**
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* Returns <code>true</code> if this object is using the fixed-cycle civil
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* calendar, or <code>false</code> if using the religious, astronomical
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* calendar.
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* @internal
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*/
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//UBool isCivil();
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// TODO: copy c'tor, etc
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// clone
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virtual Calendar* clone() const;
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private:
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/**
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* Determine whether a year is the gregorian year a leap year
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*/
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//static UBool isGregorianLeap(int32_t year);
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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;
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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 year in Saka era
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* @param year The month(0-based) in Indian year
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* @internal
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*/
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virtual int32_t handleGetMonthLength(int32_t extendedYear, int32_t month) const;
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/**
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* Return the number of days in the given Indian year
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* @internal
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*/
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virtual int32_t handleGetYearLength(int32_t extendedYear) const;
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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 int32_t handleComputeMonthStart(int32_t eyear, int32_t month, UBool useMonth) const;
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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();
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/**
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* Override Calendar to compute several fields specific to the Indian
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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);
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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(void) const;
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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(void);
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/**
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* return the calendar type, "buddhist".
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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;
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private:
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IndianCalendar(); // default constructor not implemented
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// Default century.
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protected:
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/**
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* (Overrides Calendar) Return true if the current date for this Calendar is in
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* Daylight Savings Time. Recognizes DST_OFFSET, if it is set.
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*
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* @param status Fill-in parameter which receives the status of this operation.
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* @return True if the current date for this Calendar is in Daylight Savings Time,
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* false, otherwise.
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* @internal
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*/
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virtual UBool inDaylightTime(UErrorCode& status) const;
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/**
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* Returns TRUE because the Indian Calendar does have a default century
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* @internal
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*/
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virtual UBool haveDefaultCentury() const;
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/**
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* Returns the date of the start of the default century
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* @return start of century - in milliseconds since epoch, 1970
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* @internal
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*/
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virtual UDate defaultCenturyStart() const;
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/**
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* Returns the year in which the default century begins
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* @internal
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*/
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virtual int32_t defaultCenturyStartYear() const;
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private: // default century stuff.
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/**
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* The system maintains a static default century start date. This is initialized
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* the first time it is used. Before then, it is set to SYSTEM_DEFAULT_CENTURY to
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* indicate an uninitialized state. Once the system default century date and year
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* are set, they do not change.
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*/
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static UDate fgSystemDefaultCenturyStart;
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/**
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* See documentation for systemDefaultCenturyStart.
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*/
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static int32_t fgSystemDefaultCenturyStartYear;
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/**
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* Default value that indicates the defaultCenturyStartYear is unitialized
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*/
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static const int32_t fgSystemDefaultCenturyYear;
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/**
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* start of default century, as a date
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*/
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static const UDate fgSystemDefaultCentury;
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/**
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* Returns the beginning date of the 100-year window that dates
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* with 2-digit years are considered to fall within.
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*/
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UDate internalGetDefaultCenturyStart(void) const;
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/**
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* Returns the first year of the 100-year window that dates with
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* 2-digit years are considered to fall within.
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*/
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int32_t internalGetDefaultCenturyStartYear(void) const;
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/**
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* Initializes the 100-year window that dates with 2-digit years
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* are considered to fall within so that its start date is 80 years
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* before the current time.
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*/
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static void initializeSystemDefaultCentury(void);
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};
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U_NAMESPACE_END
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#endif
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#endif
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