/*
******************************************************************************
* Copyright (C) 2003-2009, International Business Machines Corporation
* and others. All Rights Reserved.
******************************************************************************
*
* File HEBRWCAL.H
*
* Modification History:
*
* Date Name Description
* 05/13/2003 srl copied from gregocal.h
* 11/26/2003 srl copied from buddhcal.h
******************************************************************************
*/
#ifndef HEBRWCAL_H
#define HEBRWCAL_H
#include "unicode/utypes.h"
#if !UCONFIG_NO_FORMATTING
#include "unicode/calendar.h"
#include "unicode/gregocal.h"
U_NAMESPACE_BEGIN
/**
* <code>HebrewCalendar</code> is a subclass of <code>Calendar</code>
* that that implements the traditional Hebrew calendar.
* This is the civil calendar in Israel and the liturgical calendar
* of the Jewish faith worldwide.
* <p>
* The Hebrew calendar is lunisolar and thus has a number of interesting
* properties that distinguish it from the Gregorian. Months start
* on the day of (an arithmetic approximation of) each new moon. Since the
* solar year (approximately 365.24 days) is not an even multiple of
* the lunar month (approximately 29.53 days) an extra "leap month" is
* inserted in 7 out of every 19 years. To make matters even more
* interesting, the start of a year can be delayed by up to three days
* in order to prevent certain holidays from falling on the Sabbath and
* to prevent certain illegal year lengths. Finally, the lengths of certain
* months can vary depending on the number of days in the year.
* <p>
* The leap month is known as "Adar 1" and is inserted between the
* months of Shevat and Adar in leap years. Since the leap month does
* not come at the end of the year, calculations involving
* month numbers are particularly complex. Users of this class should
* make sure to use the {@link #roll roll} and {@link #add add} methods
* rather than attempting to perform date arithmetic by manipulating
* the fields directly.
* <p>
* <b>Note:</b> In the traditional Hebrew calendar, days start 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>
* If you are interested in more information on the rules behind the Hebrew
* calendar, see one of the following references:
* <ul>
* <li>"<a href="http://www.amazon.com/exec/obidos/ASIN/0521564743">Calendrical Calculations</a>",
* by Nachum Dershowitz & Edward Reingold, Cambridge University Press, 1997, pages 85-91.
*
* <li>Hebrew Calendar Science and Myths,
* <a href="http://www.geocities.com/Athens/1584/">
* http://www.geocities.com/Athens/1584/</a>
*
* <li>The Calendar FAQ,
* <a href="http://www.faqs.org/faqs/calendars/faq/">
* http://www.faqs.org/faqs/calendars/faq/</a>
* </ul>
* <p>
* @see com.ibm.icu.util.GregorianCalendar
*
* @author Laura Werner
* @author Alan Liu
* @author Steven R. Loomis
* <p>
* @internal
*/
class U_I18N_API HebrewCalendar : public Calendar {
public:
/**
* Useful constants for HebrewCalendar.
* @internal
*/
enum EEras {
/**
* Constant for Tishri, the 1st month of the Hebrew year.
*/
TISHRI,
/**
* Constant for Heshvan, the 2nd month of the Hebrew year.
*/
HESHVAN,
/**
* Constant for Kislev, the 3rd month of the Hebrew year.
*/
KISLEV,
/**
* Constant for Tevet, the 4th month of the Hebrew year.
*/
TEVET,
/**
* Constant for Shevat, the 5th month of the Hebrew year.
*/
SHEVAT,
/**
* Constant for Adar I, the 6th month of the Hebrew year
* (present in leap years only). In non-leap years, the calendar
* jumps from Shevat (5th month) to Adar (7th month).
*/
ADAR_1,
/**
* Constant for the Adar, the 7th month of the Hebrew year.
*/
ADAR,
/**
* Constant for Nisan, the 8th month of the Hebrew year.
*/
NISAN,
/**
* Constant for Iyar, the 9th month of the Hebrew year.
*/
IYAR,
/**
* Constant for Sivan, the 10th month of the Hebrew year.
*/
SIVAN,
/**
* Constant for Tammuz, the 11th month of the Hebrew year.
*/
TAMUZ,
/**
* Constant for Av, the 12th month of the Hebrew year.
*/
AV,
/**
* Constant for Elul, the 13th month of the Hebrew year.
*/
ELUL
};
/**
* Constructs a HebrewCalendar 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 HebrewCalendar object construction.
* Returns U_ZERO_ERROR if constructed successfully.
* @internal
*/
HebrewCalendar(const Locale& aLocale, UErrorCode& success);
/**
* Destructor
* @internal
*/
virtual ~HebrewCalendar();
/**
* Copy constructor
* @param source the object to be copied.
* @internal
*/
HebrewCalendar(const HebrewCalendar& source);
/**
* Default assignment operator
* @param right the object to be copied.
* @internal
*/
HebrewCalendar& operator=(const HebrewCalendar& right);
/**
* Create and return a polymorphic copy of this calendar.
* @return return a polymorphic copy of this calendar.
* @internal
*/
virtual Calendar* clone(void) const;
public:
/**
* Override Calendar Returns a unique class ID POLYMORPHICALLY. Pure virtual
* override. This method is to implement a simple version of RTTI, since not all C++
* compilers support genuine RTTI. Polymorphic operator==() and clone() methods call
* this method.
*
* @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
*/
static UClassID U_EXPORT2 getStaticClassID(void);
/**
* return the calendar type, "hebrew".
*
* @return calendar type
* @internal
*/
virtual const char * getType() const;
// Calendar API
public:
/**
* (Overrides Calendar) UDate Arithmetic function. Adds the specified (signed) amount
* of time to the given time field, based on the calendar's rules. For more
* information, see the documentation for Calendar::add().
*
* @param field The time field.
* @param amount The amount of date or time to be added to the field.
* @param status Output param set to success/failure code on exit. If any value
* previously set in the time field is invalid, this will be set to
* an error status.
*/
virtual void add(UCalendarDateFields field, int32_t amount, UErrorCode& status);
/**
* @deprecated ICU 2.6 use UCalendarDateFields instead of EDateFields
*/
virtual void add(EDateFields field, int32_t amount, UErrorCode& status);
/**
* (Overrides Calendar) Rolls up or down by the given amount in the specified field.
* For more information, see the documentation for Calendar::roll().
*
* @param field The time field.
* @param amount Indicates amount to roll.
* @param status Output param set to success/failure code on exit. If any value
* previously set in the time field is invalid, this will be set to
* an error status.
* @internal
*/
virtual void roll(UCalendarDateFields field, int32_t amount, UErrorCode& status);
/**
* (Overrides Calendar) Rolls up or down by the given amount in the specified field.
* For more information, see the documentation for Calendar::roll().
*
* @param field The time field.
* @param amount Indicates amount to roll.
* @param status Output param set to success/failure code on exit. If any value
* previously set in the time field is invalid, this will be set to
* an error status.
* @deprecated ICU 2.6. Use roll(UCalendarDateFields field, int32_t amount, UErrorCode& status) instead.
` */
virtual void roll(EDateFields field, int32_t amount, UErrorCode& status);
/**
* @internal
*/
static UBool isLeapYear(int32_t year) ;
protected:
/**
* Subclass API for defining limits of different types.
* Subclasses must implement this method to return limits for the
* following fields:
*
* <pre>UCAL_ERA
* UCAL_YEAR
* UCAL_MONTH
* UCAL_WEEK_OF_YEAR
* UCAL_WEEK_OF_MONTH
* UCAL_DATE (DAY_OF_MONTH on Java)
* UCAL_DAY_OF_YEAR
* UCAL_DAY_OF_WEEK_IN_MONTH
* UCAL_YEAR_WOY
* UCAL_EXTENDED_YEAR</pre>
*
* @param field one of the above field numbers
* @param limitType one of <code>MINIMUM</code>, <code>GREATEST_MINIMUM</code>,
* <code>LEAST_MAXIMUM</code>, or <code>MAXIMUM</code>
* @internal
*/
virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) const;
/**
* Return the number of days in the given month of the given extended
* year of this calendar system. Subclasses should override this
* method if they can provide a more correct or more efficient
* implementation than the default implementation in Calendar.
* @internal
*/
virtual int32_t handleGetMonthLength(int32_t extendedYear, int32_t month) const;
/**
* Return the number of days in the given extended year of this
* calendar system. Subclasses should override this method if they can
* provide a more correct or more efficient implementation than the
* default implementation in Calendar.
* @stable ICU 2.0
*/
virtual int32_t handleGetYearLength(int32_t eyear) const;
/**
* Subclasses may override this method to compute several fields
* specific to each calendar system. These are:
*
* <ul><li>ERA
* <li>YEAR
* <li>MONTH
* <li>DAY_OF_MONTH
* <li>DAY_OF_YEAR
* <li>EXTENDED_YEAR</ul>
*
* <p>The GregorianCalendar implementation implements
* a calendar with the specified Julian/Gregorian cutover date.
* @internal
*/
virtual void handleComputeFields(int32_t julianDay, UErrorCode &status);
/**
* Return the extended year defined by the current fields. This will
* use the UCAL_EXTENDED_YEAR field or the UCAL_YEAR and supra-year fields (such
* as UCAL_ERA) specific to the calendar system, depending on which set of
* fields is newer.
* @return the extended year
* @internal
*/
virtual int32_t handleGetExtendedYear();
/**
* Return the Julian day number of day before the first day of the
* given month in the given extended year. Subclasses should override
* this method to implement their calendar system.
* @param eyear the extended year
* @param month the zero-based month, or 0 if useMonth is false
* @param useMonth if false, compute the day before the first day of
* the given year, otherwise, compute the day before the first day of
* the given month
* @param return the Julian day number of the day before the first
* day of the given month and year
* @internal
*/
virtual int32_t handleComputeMonthStart(int32_t eyear, int32_t month,
UBool useMonth) const;
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 Hebrew 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);
private: // Calendar-specific implementation
/**
* Finds the day # of the first day in the given Hebrew year.
* To do this, we want to calculate the time of the Tishri 1 new moon
* in that year.
* <p>
* The algorithm here is similar to ones described in a number of
* references, including:
* <ul>
* <li>"Calendrical Calculations", by Nachum Dershowitz & Edward Reingold,
* Cambridge University Press, 1997, pages 85-91.
*
* <li>Hebrew Calendar Science and Myths,
* <a href="http://www.geocities.com/Athens/1584/">
* http://www.geocities.com/Athens/1584/</a>
*
* <li>The Calendar FAQ,
* <a href="http://www.faqs.org/faqs/calendars/faq/">
* http://www.faqs.org/faqs/calendars/faq/</a>
* </ul>
* @param year extended year
* @return day number (JD)
* @internal
*/
static int32_t startOfYear(int32_t year, UErrorCode& status);
static int32_t absoluteDayToDayOfWeek(int32_t day) ;
/**
* @internal
*/
int32_t yearType(int32_t year) const;
/**
* @internal
*/
static int32_t monthsInYear(int32_t year) ;
};
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif
//eof