487 lines
16 KiB
C++
487 lines
16 KiB
C++
/*
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******************************************************************************
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* Copyright (C) 2003-2007, 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 HEBRWCAL.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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* 05/13/2003 srl copied from gregocal.h
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* 11/26/2003 srl copied from buddhcal.h
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******************************************************************************
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*/
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#ifndef HEBRWCAL_H
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#define HEBRWCAL_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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#include "unicode/gregocal.h"
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U_NAMESPACE_BEGIN
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/**
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* <code>HebrewCalendar</code> is a subclass of <code>Calendar</code>
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* that that implements the traditional Hebrew calendar.
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* This is the civil calendar in Israel and the liturgical calendar
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* of the Jewish faith worldwide.
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* <p>
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* The Hebrew calendar is lunisolar and thus has a number of interesting
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* properties that distinguish it from the Gregorian. Months start
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* on the day of (an arithmetic approximation of) each new moon. Since the
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* solar year (approximately 365.24 days) is not an even multiple of
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* the lunar month (approximately 29.53 days) an extra "leap month" is
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* inserted in 7 out of every 19 years. To make matters even more
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* interesting, the start of a year can be delayed by up to three days
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* in order to prevent certain holidays from falling on the Sabbath and
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* to prevent certain illegal year lengths. Finally, the lengths of certain
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* months can vary depending on the number of days in the year.
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* <p>
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* The leap month is known as "Adar 1" and is inserted between the
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* months of Shevat and Adar in leap years. Since the leap month does
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* not come at the end of the year, calculations involving
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* month numbers are particularly complex. Users of this class should
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* make sure to use the {@link #roll roll} and {@link #add add} methods
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* rather than attempting to perform date arithmetic by manipulating
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* the fields directly.
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* <p>
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* <b>Note:</b> In the traditional Hebrew calendar, days start at sunset.
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* 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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* If you are interested in more information on the rules behind the Hebrew
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* calendar, see one of the following references:
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* <ul>
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* <li>"<a href="http://www.amazon.com/exec/obidos/ASIN/0521564743">Calendrical Calculations</a>",
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* by Nachum Dershowitz & Edward Reingold, Cambridge University Press, 1997, pages 85-91.
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*
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* <li>Hebrew Calendar Science and Myths,
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* <a href="http://www.geocities.com/Athens/1584/">
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* http://www.geocities.com/Athens/1584/</a>
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*
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* <li>The Calendar FAQ,
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* <a href="http://www.faqs.org/faqs/calendars/faq/">
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* http://www.faqs.org/faqs/calendars/faq/</a>
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* </ul>
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* <p>
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* @see com.ibm.icu.util.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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* <p>
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* @internal
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*/
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class HebrewCalendar : public Calendar {
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public:
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/**
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* Useful constants for HebrewCalendar.
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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 Tishri, the 1st month of the Hebrew year.
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*/
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TISHRI,
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/**
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* Constant for Heshvan, the 2nd month of the Hebrew year.
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*/
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HESHVAN,
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/**
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* Constant for Kislev, the 3rd month of the Hebrew year.
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*/
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KISLEV,
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/**
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* Constant for Tevet, the 4th month of the Hebrew year.
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*/
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TEVET,
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/**
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* Constant for Shevat, the 5th month of the Hebrew year.
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*/
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SHEVAT,
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/**
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* Constant for Adar I, the 6th month of the Hebrew year
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* (present in leap years only). In non-leap years, the calendar
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* jumps from Shevat (5th month) to Adar (7th month).
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*/
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ADAR_1,
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/**
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* Constant for the Adar, the 7th month of the Hebrew year.
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*/
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ADAR,
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/**
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* Constant for Nisan, the 8th month of the Hebrew year.
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*/
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NISAN,
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/**
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* Constant for Iyar, the 9th month of the Hebrew year.
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*/
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IYAR,
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/**
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* Constant for Sivan, the 10th month of the Hebrew year.
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*/
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SIVAN,
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/**
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* Constant for Tammuz, the 11th month of the Hebrew year.
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*/
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TAMUZ,
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/**
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* Constant for Av, the 12th month of the Hebrew year.
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*/
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AV,
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/**
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* Constant for Elul, the 13th month of the Hebrew year.
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*/
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ELUL
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};
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/**
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* Constructs a HebrewCalendar 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 HebrewCalendar 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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HebrewCalendar(const Locale& aLocale, UErrorCode& success);
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/**
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* Destructor
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* @internal
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*/
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virtual ~HebrewCalendar();
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/**
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* Copy constructor
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* @param source the object to be copied.
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* @internal
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*/
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HebrewCalendar(const HebrewCalendar& source);
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/**
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* Default assignment operator
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* @param right the object to be copied.
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* @internal
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*/
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HebrewCalendar& operator=(const HebrewCalendar& right);
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/**
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* Create and return a polymorphic copy of this calendar.
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* @return return a polymorphic copy of this calendar.
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* @internal
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*/
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virtual Calendar* clone(void) const;
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public:
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/**
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* Override Calendar Returns a unique class ID POLYMORPHICALLY. Pure virtual
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* override. This method is to implement a simple version of RTTI, since not all C++
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* compilers support genuine RTTI. Polymorphic operator==() and clone() methods call
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* this method.
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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, "hebrew".
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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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// Calendar API
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public:
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/**
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* (Overrides Calendar) UDate Arithmetic function. Adds the specified (signed) amount
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* of time to the given time field, based on the calendar's rules. For more
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* information, see the documentation for Calendar::add().
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*
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* @param field The time field.
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* @param amount The amount of date or time to be added to the field.
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* @param status Output param set to success/failure code on exit. If any value
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* previously set in the time field is invalid, this will be set to
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* an error status.
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*/
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virtual void add(UCalendarDateFields field, int32_t amount, UErrorCode& status);
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/**
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* @deprecated ICU 2.6 use UCalendarDateFields instead of EDateFields
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*/
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virtual void add(EDateFields field, int32_t amount, UErrorCode& status);
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/**
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* (Overrides Calendar) Rolls up or down by the given amount in the specified field.
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* For more information, see the documentation for Calendar::roll().
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*
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* @param field The time field.
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* @param amount Indicates amount to roll.
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* @param status Output param set to success/failure code on exit. If any value
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* previously set in the time field is invalid, this will be set to
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* an error status.
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* @internal
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*/
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virtual void roll(UCalendarDateFields field, int32_t amount, UErrorCode& status);
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/**
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* (Overrides Calendar) Rolls up or down by the given amount in the specified field.
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* For more information, see the documentation for Calendar::roll().
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*
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* @param field The time field.
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* @param amount Indicates amount to roll.
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* @param status Output param set to success/failure code on exit. If any value
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* previously set in the time field is invalid, this will be set to
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* an error status.
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* @deprecated ICU 2.6. Use roll(UCalendarDateFields field, int32_t amount, UErrorCode& status) instead.
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` */
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virtual void roll(EDateFields field, int32_t amount, UErrorCode& status);
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protected:
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/**
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* Subclass API for defining limits of different types.
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* Subclasses must implement this method to return limits for the
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* following fields:
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*
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* <pre>UCAL_ERA
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* UCAL_YEAR
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* UCAL_MONTH
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* UCAL_WEEK_OF_YEAR
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* UCAL_WEEK_OF_MONTH
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* UCAL_DATE (DAY_OF_MONTH on Java)
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* UCAL_DAY_OF_YEAR
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* UCAL_DAY_OF_WEEK_IN_MONTH
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* UCAL_YEAR_WOY
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* UCAL_EXTENDED_YEAR</pre>
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*
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* @param field one of the above field numbers
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* @param limitType one of <code>MINIMUM</code>, <code>GREATEST_MINIMUM</code>,
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* <code>LEAST_MAXIMUM</code>, or <code>MAXIMUM</code>
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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 number of days in the given month of the given extended
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* year of this calendar system. Subclasses should override this
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* method if they can provide a more correct or more efficient
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* implementation than the default implementation in Calendar.
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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 extended year of this
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* calendar system. Subclasses should override this method if they can
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* provide a more correct or more efficient implementation than the
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* default implementation in Calendar.
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* @stable ICU 2.0
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*/
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virtual int32_t handleGetYearLength(int32_t eyear) const;
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/**
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* Subclasses may override this method to compute several fields
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* specific to each 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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* <p>The GregorianCalendar implementation implements
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* a calendar with the specified Julian/Gregorian cutover date.
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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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/**
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* Return the extended year defined by the current fields. This will
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* use the UCAL_EXTENDED_YEAR field or the UCAL_YEAR and supra-year fields (such
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* as UCAL_ERA) specific to the calendar system, depending on which set of
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* fields is newer.
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* @return the extended year
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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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* Return the Julian day number of day before the first day of the
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* given month in the given extended year. Subclasses should override
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* this method to implement their calendar system.
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* @param eyear the extended year
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* @param month the zero-based month, or 0 if useMonth is false
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* @param useMonth if false, compute the day before the first day of
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* the given year, otherwise, compute the day before the first day of
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* the given month
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* @param return the Julian day number of the day before the first
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* day of the given month and year
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* @internal
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*/
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virtual int32_t handleComputeMonthStart(int32_t eyear, int32_t month,
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UBool useMonth) const;
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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 Hebrew 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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private: // Calendar-specific implementation
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/**
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* Finds the day # of the first day in the given Hebrew year.
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* To do this, we want to calculate the time of the Tishri 1 new moon
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* in that year.
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* <p>
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* The algorithm here is similar to ones described in a number of
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* references, including:
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* <ul>
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* <li>"Calendrical Calculations", by Nachum Dershowitz & Edward Reingold,
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* Cambridge University Press, 1997, pages 85-91.
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|
*
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|
* <li>Hebrew Calendar Science and Myths,
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* <a href="http://www.geocities.com/Athens/1584/">
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|
* http://www.geocities.com/Athens/1584/</a>
|
|
*
|
|
* <li>The Calendar FAQ,
|
|
* <a href="http://www.faqs.org/faqs/calendars/faq/">
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|
* http://www.faqs.org/faqs/calendars/faq/</a>
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* </ul>
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* @param year extended year
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* @return day number (JD)
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* @internal
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*/
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static int32_t startOfYear(int32_t year, UErrorCode& status);
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static int32_t absoluteDayToDayOfWeek(int32_t day) ;
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/**
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* @internal
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*/
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int32_t yearType(int32_t year) const;
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/**
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* @internal
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*/
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static UBool isLeapYear(int32_t year) ;
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/**
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* @internal
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*/
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static int32_t monthsInYear(int32_t year) ;
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};
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_FORMATTING */
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#endif
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//eof
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