/*
*****************************************************************************
* Copyright (C) 2003-2008, International Business Machines Corporation
* and others. All Rights Reserved.
*****************************************************************************
*
* File INDIANCAL.H
*****************************************************************************
*/
#ifndef INDIANCAL_H
#define INDIANCAL_H
#include "unicode/utypes.h"
#if !UCONFIG_NO_FORMATTING
#include "unicode/calendar.h"
U_NAMESPACE_BEGIN
/**
* Concrete class which provides the Indian calendar.
* <P>
* <code>IndianCalendar</code> is a subclass of <code>Calendar</code>
* that numbers years since the begining of SAKA ERA. This is the civil calendar
* which is accepted by government of India as Indian National Calendar.
* The two calendars most widely used in India today are the Vikrama calendar
* followed in North India and the Shalivahana or Saka calendar which is followed
* in South India and Maharashtra.
* A variant of the Shalivahana Calendar was reformed and standardized as the
* Indian National calendar in 1957.
* <p>
* Some details of Indian National Calendar (to be implemented) :
* The Months
* Month Length Start date (Gregorian)
* =================================================
* 1 Chaitra 30/31 March 22*
* 2 Vaisakha 31 April 21
* 3 Jyaistha 31 May 22
* 4 Asadha 31 June 22
* 5 Sravana 31 July 23
* 6 Bhadra 31 August 23
* 7 Asvina 30 September 23
* 8 Kartika 30 October 23
* 9 Agrahayana 30 November 22
* 10 Pausa 30 December 22
* 11 Magha 30 January 21
* 12 Phalguna 30 February 20
* In leap years, Chaitra has 31 days and starts on March 21 instead.
* The leap years of Gregorian calendar and Indian National Calendar are in synchornization.
* So When its a leap year in Gregorian calendar then Chaitra has 31 days.
*
* The Years
* Years are counted in the Saka Era, which starts its year 0 in 78AD (by gregorian calendar).
* So for eg. 9th June 2006 by Gregorian Calendar, is same as 19th of Jyaistha in 1928 of Saka
* era by Indian National Calendar.
* <p>
* The Indian Calendar has only one allowable era: <code>Saka Era</code>. If the
* calendar is not in lenient mode (see <code>setLenient</code>), dates before
* 1/1/1 Saka Era are rejected with an <code>IllegalArgumentException</code>.
* <p>
* @internal
*/
class IndianCalendar : public Calendar {
public:
/**
* Useful constants for IndianCalendar.
* @internal
*/
enum EEras {
/**
* Constant for Chaitra, the 1st month of the Indian year.
*/
CHAITRA,
/**
* Constant for Vaisakha, the 2nd month of the Indian year.
*/
VAISAKHA,
/**
* Constant for Jyaistha, the 3rd month of the Indian year.
*/
JYAISTHA,
/**
* Constant for Asadha, the 4th month of the Indian year.
*/
ASADHA,
/**
* Constant for Sravana, the 5th month of the Indian year.
*/
SRAVANA,
/**
* Constant for Bhadra the 6th month of the Indian year
*/
BHADRA,
/**
* Constant for the Asvina, the 7th month of the Indian year.
*/
ASVINA,
/**
* Constant for Kartika, the 8th month of the Indian year.
*/
KARTIKA,
/**
* Constant for Agrahayana, the 9th month of the Indian year.
*/
AGRAHAYANA,
/**
* Constant for Pausa, the 10th month of the Indian year.
*/
PAUSA,
/**
* Constant for Magha, the 11th month of the Indian year.
*/
MAGHA,
/**
* Constant for Phalguna, the 12th month of the Indian year.
*/
PHALGUNA
};
//-------------------------------------------------------------------------
// Constructors...
//-------------------------------------------------------------------------
/**
* Constructs an IndianCalendar 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 IndianCalendar object construction.
* Returns U_ZERO_ERROR if constructed successfully.
* @param beCivil Whether the calendar should be civil (default-TRUE) or religious (FALSE)
* @internal
*/
IndianCalendar(const Locale& aLocale, UErrorCode &success);
/**
* Copy Constructor
* @internal
*/
IndianCalendar(const IndianCalendar& other);
/**
* Destructor.
* @internal
*/
virtual ~IndianCalendar();
/**
* Determines whether this object uses the fixed-cycle Indian civil calendar
* or an approximation of the religious, astronomical calendar.
*
* @param beCivil <code>CIVIL</code> to use the civil calendar,
* <code>ASTRONOMICAL</code> to use the astronomical calendar.
* @internal
*/
//void setCivil(ECivil beCivil, 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 the gregorian year a leap year
*/
//static UBool isGregorianLeap(int32_t year);
//----------------------------------------------------------------------
// 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 year in Saka era
* @param year The month(0-based) in Indian year
* @internal
*/
virtual int32_t handleGetMonthLength(int32_t extendedYear, int32_t month) const;
/**
* Return the number of days in the given Indian 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 Indian
* 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:
IndianCalendar(); // 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 Indian 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: // default century stuff.
/**
* The system maintains a static default century start date. This is initialized
* the first time it is used. Before then, it is set to SYSTEM_DEFAULT_CENTURY to
* indicate an uninitialized state. Once the system default century date and year
* are set, they do not change.
*/
static UDate fgSystemDefaultCenturyStart;
/**
* See documentation for systemDefaultCenturyStart.
*/
static int32_t fgSystemDefaultCenturyStartYear;
/**
* Default value that indicates the defaultCenturyStartYear is unitialized
*/
static const int32_t fgSystemDefaultCenturyYear;
/**
* start of default century, as a date
*/
static const UDate fgSystemDefaultCentury;
/**
* Returns the beginning date of the 100-year window that dates
* with 2-digit years are considered to fall within.
*/
UDate internalGetDefaultCenturyStart(void) const;
/**
* Returns the first year of the 100-year window that dates with
* 2-digit years are considered to fall within.
*/
int32_t internalGetDefaultCenturyStartYear(void) const;
/**
* 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 initializeSystemDefaultCentury(void);
};
U_NAMESPACE_END
#endif
#endif