730 lines
24 KiB
C++
730 lines
24 KiB
C++
/*
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* Copyright (C) 2003-2004, 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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* 12/03/2003 srl ported from java HebrewCalendar
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*****************************************************************************
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*/
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#include "hebrwcal.h"
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#if !UCONFIG_NO_FORMATTING
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#include "mutex.h"
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#include <float.h>
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#include "gregoimp.h" // Math
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#include "astro.h" // CalendarAstronomer
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#include "uhash.h"
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#include "ucln_in.h"
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// Hebrew Calendar implementation
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/**
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* The absolute date, in milliseconds since 1/1/1970 AD, Gregorian,
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* of the start of the Hebrew calendar. In order to keep this calendar's
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* time of day in sync with that of the Gregorian calendar, we use
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* midnight, rather than sunset the day before.
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*/
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static const double EPOCH_MILLIS = -180799862400000.; // 1/1/1 HY
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static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
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// Minimum Greatest Least Maximum
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// Minimum Maximum
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{ 0, 0, 0, 0 }, // ERA
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{ 1, 1, 5000000, 5000000 }, // YEAR
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{ 0, 0, 12, 12 }, // MONTH
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{ 1, 1, 51, 56 }, // WEEK_OF_YEAR
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{ 0, 0, 5, 6 }, // WEEK_OF_MONTH
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{ 1, 1, 29, 30 }, // DAY_OF_MONTH
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{ 1, 1, 353, 385 }, // DAY_OF_YEAR
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
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{ -1, -1, 4, 6 }, // DAY_OF_WEEK_IN_MONTH
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1/* */}, // AM_PM
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
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{ -5000001, -5000001, 5000001, 5000001 }, // YEAR_WOY
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
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{ -5000000, -5000000, 5000000, 5000000 }, // EXTENDED_YEAR
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
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};
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/**
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* The lengths of the Hebrew months. This is complicated, because there
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* are three different types of years, or six if you count leap years.
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* Due to the rules for postponing the start of the year to avoid having
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* certain holidays fall on the sabbath, the year can end up being three
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* different lengths, called "deficient", "normal", and "complete".
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*/
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static const int32_t MONTH_LENGTH[][3] = {
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// Deficient Normal Complete
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{ 30, 30, 30 }, //Tishri
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{ 29, 29, 30 }, //Heshvan
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{ 29, 30, 30 }, //Kislev
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{ 29, 29, 29 }, //Tevet
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{ 30, 30, 30 }, //Shevat
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{ 30, 30, 30 }, //Adar I (leap years only)
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{ 29, 29, 29 }, //Adar
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{ 30, 30, 30 }, //Nisan
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{ 29, 29, 29 }, //Iyar
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{ 30, 30, 30 }, //Sivan
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{ 29, 29, 29 }, //Tammuz
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{ 30, 30, 30 }, //Av
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{ 29, 29, 29 }, //Elul
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};
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/**
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* The cumulative # of days to the end of each month in a non-leap year
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* Although this can be calculated from the MONTH_LENGTH table,
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* keeping it around separately makes some calculations a lot faster
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*/
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static const int32_t MONTH_START[][3] = {
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// Deficient Normal Complete
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{ 0, 0, 0 }, // (placeholder)
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{ 30, 30, 30 }, // Tishri
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{ 59, 59, 60 }, // Heshvan
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{ 88, 89, 90 }, // Kislev
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{ 117, 118, 119 }, // Tevet
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{ 147, 148, 149 }, // Shevat
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{ 147, 148, 149 }, // (Adar I placeholder)
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{ 176, 177, 178 }, // Adar
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{ 206, 207, 208 }, // Nisan
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{ 235, 236, 237 }, // Iyar
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{ 265, 266, 267 }, // Sivan
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{ 294, 295, 296 }, // Tammuz
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{ 324, 325, 326 }, // Av
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{ 353, 354, 355 }, // Elul
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};
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/**
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* The cumulative # of days to the end of each month in a leap year
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*/
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static const int32_t LEAP_MONTH_START[][3] = {
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// Deficient Normal Complete
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{ 0, 0, 0 }, // (placeholder)
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{ 30, 30, 30 }, // Tishri
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{ 59, 59, 60 }, // Heshvan
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{ 88, 89, 90 }, // Kislev
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{ 117, 118, 119 }, // Tevet
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{ 147, 148, 149 }, // Shevat
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{ 177, 178, 179 }, // Adar I
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{ 206, 207, 208 }, // Adar II
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{ 236, 237, 238 }, // Nisan
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{ 265, 266, 267 }, // Iyar
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{ 295, 296, 297 }, // Sivan
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{ 324, 325, 326 }, // Tammuz
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{ 354, 355, 356 }, // Av
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{ 383, 384, 385 }, // Elul
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};
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static CalendarCache *gCache = NULL;
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U_CDECL_BEGIN
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static UBool calendar_hebrew_cleanup(void) {
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delete gCache;
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gCache = NULL;
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return TRUE;
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}
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U_CDECL_END
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U_NAMESPACE_BEGIN
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//-------------------------------------------------------------------------
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// Constructors...
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//-------------------------------------------------------------------------
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/**
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* Constructs a default <code>HebrewCalendar</code> using the current time
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* in the default time zone with the default locale.
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* @internal
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*/
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HebrewCalendar::HebrewCalendar(const Locale& aLocale, UErrorCode& success)
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: Calendar(TimeZone::createDefault(), aLocale, success)
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{
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setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
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}
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HebrewCalendar::~HebrewCalendar() {
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}
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const char *HebrewCalendar::getType() const {
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return "hebrew";
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}
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Calendar* HebrewCalendar::clone() const {
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return new HebrewCalendar(*this);
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}
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HebrewCalendar::HebrewCalendar(const HebrewCalendar& other) : Calendar(other) {
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}
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//-------------------------------------------------------------------------
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// Rolling and adding functions overridden from Calendar
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//
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// These methods call through to the default implementation in IBMCalendar
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// for most of the fields and only handle the unusual ones themselves.
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//-------------------------------------------------------------------------
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/**
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* Add a signed amount to a specified field, using this calendar's rules.
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* For example, to add three days to the current date, you can call
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* <code>add(Calendar.DATE, 3)</code>.
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* <p>
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* When adding to certain fields, the values of other fields may conflict and
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* need to be changed. For example, when adding one to the {@link #MONTH MONTH} field
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* for the date "30 Av 5758", the {@link #DAY_OF_MONTH DAY_OF_MONTH} field
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* must be adjusted so that the result is "29 Elul 5758" rather than the invalid
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* "30 Elul 5758".
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* <p>
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* This method is able to add to
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* all fields except for {@link #ERA ERA}, {@link #DST_OFFSET DST_OFFSET},
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* and {@link #ZONE_OFFSET ZONE_OFFSET}.
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* <p>
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* <b>Note:</b> You should always use {@link #roll roll} and add rather
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* than attempting to perform arithmetic operations directly on the fields
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* of a <tt>HebrewCalendar</tt>. Since the {@link #MONTH MONTH} field behaves
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* discontinuously in non-leap years, simple arithmetic can give invalid results.
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* <p>
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* @param field the time field.
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* @param amount the amount to add to the field.
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*
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* @exception IllegalArgumentException if the field is invalid or refers
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* to a field that cannot be handled by this method.
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* @internal
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*/
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void HebrewCalendar::add(UCalendarDateFields field, int32_t amount, UErrorCode& status)
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{
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if(U_FAILURE(status)) {
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return;
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}
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switch (field) {
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case UCAL_MONTH:
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{
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// We can't just do a set(MONTH, get(MONTH) + amount). The
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// reason is ADAR_1. Suppose amount is +2 and we land in
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// ADAR_1 -- then we have to bump to ADAR_2 aka ADAR. But
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// if amount is -2 and we land in ADAR_1, then we have to
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// bump the other way -- down to SHEVAT. - Alan 11/00
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int32_t month = get(UCAL_MONTH, status);
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int32_t year = get(UCAL_YEAR, status);
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UBool acrossAdar1;
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if (amount > 0) {
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acrossAdar1 = (month < ADAR_1); // started before ADAR_1?
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month += amount;
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for (;;) {
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if (acrossAdar1 && month>=ADAR_1 && !isLeapYear(year)) {
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++month;
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}
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if (month <= ELUL) {
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break;
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}
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month -= ELUL+1;
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++year;
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acrossAdar1 = TRUE;
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}
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} else {
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acrossAdar1 = (month > ADAR_1); // started after ADAR_1?
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month += amount;
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for (;;) {
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if (acrossAdar1 && month<=ADAR_1 && !isLeapYear(year)) {
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--month;
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}
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if (month >= 0) {
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break;
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}
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month += ELUL+1;
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--year;
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acrossAdar1 = TRUE;
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}
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}
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set(UCAL_MONTH, month);
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set(UCAL_YEAR, year);
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pinField(UCAL_DAY_OF_MONTH, status);
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break;
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}
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default:
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Calendar::add(field, amount, status);
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break;
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}
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}
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/**
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* Rolls (up/down) a specified amount time on the given field. For
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* example, to roll the current date up by three days, you can call
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* <code>roll(Calendar.DATE, 3)</code>. If the
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* field is rolled past its maximum allowable value, it will "wrap" back
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* to its minimum and continue rolling.
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* For example, calling <code>roll(Calendar.DATE, 10)</code>
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* on a Hebrew calendar set to "25 Av 5758" will result in the date "5 Av 5758".
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* <p>
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* When rolling certain fields, the values of other fields may conflict and
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* need to be changed. For example, when rolling the {@link #MONTH MONTH} field
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* upward by one for the date "30 Av 5758", the {@link #DAY_OF_MONTH DAY_OF_MONTH} field
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* must be adjusted so that the result is "29 Elul 5758" rather than the invalid
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* "30 Elul".
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* <p>
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* This method is able to roll
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* all fields except for {@link #ERA ERA}, {@link #DST_OFFSET DST_OFFSET},
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* and {@link #ZONE_OFFSET ZONE_OFFSET}. Subclasses may, of course, add support for
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* additional fields in their overrides of <code>roll</code>.
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* <p>
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* <b>Note:</b> You should always use roll and {@link #add add} rather
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* than attempting to perform arithmetic operations directly on the fields
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* of a <tt>HebrewCalendar</tt>. Since the {@link #MONTH MONTH} field behaves
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* discontinuously in non-leap years, simple arithmetic can give invalid results.
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* <p>
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* @param field the time field.
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* @param amount the amount by which the field should be rolled.
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*
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* @exception IllegalArgumentException if the field is invalid or refers
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* to a field that cannot be handled by this method.
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* @internal
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*/
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void HebrewCalendar::roll(UCalendarDateFields field, int32_t amount, UErrorCode& status)
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{
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if(U_FAILURE(status)) {
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return;
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}
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switch (field) {
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case UCAL_MONTH:
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{
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int32_t month = get(UCAL_MONTH, status);
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int32_t year = get(UCAL_YEAR, status);
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UBool leapYear = isLeapYear(year);
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int32_t yearLength = monthsInYear(year);
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int32_t newMonth = month + (amount % yearLength);
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//
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// If it's not a leap year and we're rolling past the missing month
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// of ADAR_1, we need to roll an extra month to make up for it.
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//
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if (!leapYear) {
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if (amount > 0 && month < ADAR_1 && newMonth >= ADAR_1) {
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newMonth++;
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} else if (amount < 0 && month > ADAR_1 && newMonth <= ADAR_1) {
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newMonth--;
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}
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}
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set(UCAL_MONTH, (newMonth + 13) % 13);
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pinField(UCAL_DAY_OF_MONTH, status);
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return;
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}
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default:
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Calendar::roll(field, amount, status);
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}
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}
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void HebrewCalendar::roll(EDateFields field, int32_t amount, UErrorCode& status) {
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roll((UCalendarDateFields)field, amount, status);
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}
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//-------------------------------------------------------------------------
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// Support methods
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//-------------------------------------------------------------------------
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// Hebrew date calculations are performed in terms of days, hours, and
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// "parts" (or halakim), which are 1/1080 of an hour, or 3 1/3 seconds.
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static const int32_t HOUR_PARTS = 1080;
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static const int32_t DAY_PARTS = 24*HOUR_PARTS;
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// An approximate value for the length of a lunar month.
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// It is used to calculate the approximate year and month of a given
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// absolute date.
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static const int32_t MONTH_DAYS = 29;
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static const int32_t MONTH_FRACT = 12*HOUR_PARTS + 793;
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static const int32_t MONTH_PARTS = MONTH_DAYS*DAY_PARTS + MONTH_FRACT;
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// The time of the new moon (in parts) on 1 Tishri, year 1 (the epoch)
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// counting from noon on the day before. BAHARAD is an abbreviation of
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// Bet (Monday), Hey (5 hours from sunset), Resh-Daled (204).
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static const int32_t BAHARAD = 11*HOUR_PARTS + 204;
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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>
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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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*/
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int32_t HebrewCalendar::startOfYear(int32_t year, UErrorCode &status)
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{
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ucln_i18n_registerCleanup(UCLN_I18N_HEBREW_CALENDAR, calendar_hebrew_cleanup);
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int32_t day = CalendarCache::get(&gCache, year, status);
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if (day == 0) {
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int32_t months = (235 * year - 234) / 19; // # of months before year
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int32_t frac = months * MONTH_FRACT + BAHARAD; // Fractional part of day #
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day = months * 29 + (frac / DAY_PARTS); // Whole # part of calculation
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frac = frac % DAY_PARTS; // Time of day
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int32_t wd = (day % 7); // Day of week (0 == Monday)
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if (wd == 2 || wd == 4 || wd == 6) {
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// If the 1st is on Sun, Wed, or Fri, postpone to the next day
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day += 1;
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wd = (day % 7);
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}
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if (wd == 1 && frac > 15*HOUR_PARTS+204 && !isLeapYear(year) ) {
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// If the new moon falls after 3:11:20am (15h204p from the previous noon)
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// on a Tuesday and it is not a leap year, postpone by 2 days.
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// This prevents 356-day years.
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day += 2;
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}
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else if (wd == 0 && frac > 21*HOUR_PARTS+589 && isLeapYear(year-1) ) {
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// If the new moon falls after 9:32:43 1/3am (21h589p from yesterday noon)
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// on a Monday and *last* year was a leap year, postpone by 1 day.
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// Prevents 382-day years.
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day += 1;
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}
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CalendarCache::put(&gCache, year, day, status);
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}
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return day;
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}
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/**
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* Find the day of the week for a given day
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*
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* @param day The # of days since the start of the Hebrew calendar,
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* 1-based (i.e. 1/1/1 AM is day 1).
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*/
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int32_t HebrewCalendar::absoluteDayToDayOfWeek(int32_t day)
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{
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// We know that 1/1/1 AM is a Monday, which makes the math easy...
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return (day % 7) + 1;
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}
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/**
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* Returns the the type of a given year.
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* 0 "Deficient" year with 353 or 383 days
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* 1 "Normal" year with 354 or 384 days
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* 2 "Complete" year with 355 or 385 days
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*/
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int32_t HebrewCalendar::yearType(int32_t year) const
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{
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int32_t yearLength = handleGetYearLength(year);
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if (yearLength > 380) {
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yearLength -= 30; // Subtract length of leap month.
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}
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int type = 0;
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switch (yearLength) {
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case 353:
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type = 0; break;
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case 354:
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type = 1; break;
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case 355:
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type = 2; break;
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default:
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//throw new RuntimeException("Illegal year length " + yearLength + " in year " + year);
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type = 1;
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}
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return type;
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}
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/**
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* Determine whether a given Hebrew year is a leap year
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*
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* The rule here is that if (year % 19) == 0, 3, 6, 8, 11, 14, or 17.
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* The formula below performs the same test, believe it or not.
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*/
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UBool HebrewCalendar::isLeapYear(int32_t year) {
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//return (year * 12 + 17) % 19 >= 12;
|
|
int32_t x = (year*12 + 17) % 19;
|
|
return x >= ((x < 0) ? -7 : 12);
|
|
}
|
|
|
|
int32_t HebrewCalendar::monthsInYear(int32_t year) {
|
|
return isLeapYear(year) ? 13 : 12;
|
|
}
|
|
|
|
//-------------------------------------------------------------------------
|
|
// Calendar framework
|
|
//-------------------------------------------------------------------------
|
|
|
|
/**
|
|
* @internal
|
|
*/
|
|
int32_t HebrewCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
|
|
return LIMITS[field][limitType];
|
|
}
|
|
|
|
/**
|
|
* Returns the length of the given month in the given year
|
|
* @internal
|
|
*/
|
|
int32_t HebrewCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
|
|
switch (month) {
|
|
case HESHVAN:
|
|
case KISLEV:
|
|
// These two month lengths can vary
|
|
return MONTH_LENGTH[month][yearType(extendedYear)];
|
|
|
|
default:
|
|
// The rest are a fixed length
|
|
return MONTH_LENGTH[month][0];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the number of days in the given Hebrew year
|
|
* @internal
|
|
*/
|
|
int32_t HebrewCalendar::handleGetYearLength(int32_t eyear) const {
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
return startOfYear(eyear+1, status) - startOfYear(eyear, status);
|
|
}
|
|
|
|
//-------------------------------------------------------------------------
|
|
// Functions for converting from milliseconds to field values
|
|
//-------------------------------------------------------------------------
|
|
|
|
/**
|
|
* 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>
|
|
*
|
|
* Subclasses can refer to the DAY_OF_WEEK and DOW_LOCAL fields,
|
|
* which will be set when this method is called. Subclasses can
|
|
* also call the getGregorianXxx() methods to obtain Gregorian
|
|
* calendar equivalents for the given Julian day.
|
|
*
|
|
* <p>In addition, subclasses should compute any subclass-specific
|
|
* fields, that is, fields from BASE_FIELD_COUNT to
|
|
* getFieldCount() - 1.
|
|
* @internal
|
|
*/
|
|
void HebrewCalendar::handleComputeFields(int32_t julianDay, UErrorCode &status) {
|
|
int32_t d = julianDay - 347997;
|
|
double m = ((d * (double)DAY_PARTS)/ (double) MONTH_PARTS); // Months (approx)
|
|
int32_t year = (int32_t)( ((19. * m + 234.) / 235.) + 1.); // Years (approx)
|
|
int32_t ys = startOfYear(year, status); // 1st day of year
|
|
int32_t dayOfYear = (d - ys);
|
|
|
|
// Because of the postponement rules, it's possible to guess wrong. Fix it.
|
|
while (dayOfYear < 1) {
|
|
year--;
|
|
ys = startOfYear(year, status);
|
|
dayOfYear = (d - ys);
|
|
}
|
|
|
|
// Now figure out which month we're in, and the date within that month
|
|
int32_t type = yearType(year);
|
|
UBool isLeap = isLeapYear(year);
|
|
|
|
int32_t month = 0;
|
|
while (dayOfYear > ( isLeap ? LEAP_MONTH_START[month][type] : MONTH_START[month][type] ) ) {
|
|
month++;
|
|
}
|
|
month--;
|
|
int dayOfMonth = dayOfYear - (isLeap ? LEAP_MONTH_START[month][type] : MONTH_START[month][type]);
|
|
|
|
internalSet(UCAL_ERA, 0);
|
|
internalSet(UCAL_YEAR, year);
|
|
internalSet(UCAL_EXTENDED_YEAR, year);
|
|
internalSet(UCAL_MONTH, month);
|
|
internalSet(UCAL_DAY_OF_MONTH, dayOfMonth);
|
|
internalSet(UCAL_DAY_OF_YEAR, dayOfYear);
|
|
}
|
|
|
|
//-------------------------------------------------------------------------
|
|
// Functions for converting from field values to milliseconds
|
|
//-------------------------------------------------------------------------
|
|
|
|
/**
|
|
* @internal
|
|
*/
|
|
int32_t HebrewCalendar::handleGetExtendedYear() {
|
|
int32_t year;
|
|
if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
|
|
year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
|
|
} else {
|
|
year = internalGet(UCAL_YEAR, 1); // Default to year 1
|
|
}
|
|
return year;
|
|
}
|
|
|
|
/**
|
|
* Return JD of start of given month/year.
|
|
* @internal
|
|
*/
|
|
int32_t HebrewCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /*useMonth*/) const {
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
// Resolve out-of-range months. This is necessary in order to
|
|
// obtain the correct year. We correct to
|
|
// a 12- or 13-month year (add/subtract 12 or 13, depending
|
|
// on the year) but since we _always_ number from 0..12, and
|
|
// the leap year determines whether or not month 5 (Adar 1)
|
|
// is present, we allow 0..12 in any given year.
|
|
while (month < 0) {
|
|
month += monthsInYear(--eyear);
|
|
}
|
|
// Careful: allow 0..12 in all years
|
|
while (month > 12) {
|
|
month -= monthsInYear(eyear++);
|
|
}
|
|
|
|
int32_t day = startOfYear(eyear, status);
|
|
|
|
if(U_FAILURE(status)) {
|
|
return 0;
|
|
}
|
|
|
|
if (month != 0) {
|
|
if (isLeapYear(eyear)) {
|
|
day += LEAP_MONTH_START[month][yearType(eyear)];
|
|
} else {
|
|
day += MONTH_START[month][yearType(eyear)];
|
|
}
|
|
}
|
|
|
|
return (int) (day + 347997);
|
|
}
|
|
|
|
UBool
|
|
HebrewCalendar::inDaylightTime(UErrorCode& status) const
|
|
{
|
|
// copied from GregorianCalendar
|
|
if (U_FAILURE(status) || !getTimeZone().useDaylightTime())
|
|
return FALSE;
|
|
|
|
// Force an update of the state of the Calendar.
|
|
((HebrewCalendar*)this)->complete(status); // cast away const
|
|
|
|
return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
|
|
}
|
|
|
|
// default century
|
|
const UDate HebrewCalendar::fgSystemDefaultCentury = DBL_MIN;
|
|
const int32_t HebrewCalendar::fgSystemDefaultCenturyYear = -1;
|
|
|
|
UDate HebrewCalendar::fgSystemDefaultCenturyStart = DBL_MIN;
|
|
int32_t HebrewCalendar::fgSystemDefaultCenturyStartYear = -1;
|
|
|
|
|
|
UBool HebrewCalendar::haveDefaultCentury() const
|
|
{
|
|
return TRUE;
|
|
}
|
|
|
|
UDate HebrewCalendar::defaultCenturyStart() const
|
|
{
|
|
return internalGetDefaultCenturyStart();
|
|
}
|
|
|
|
int32_t HebrewCalendar::defaultCenturyStartYear() const
|
|
{
|
|
return internalGetDefaultCenturyStartYear();
|
|
}
|
|
|
|
UDate
|
|
HebrewCalendar::internalGetDefaultCenturyStart() const
|
|
{
|
|
// lazy-evaluate systemDefaultCenturyStart
|
|
UBool needsUpdate;
|
|
{
|
|
Mutex m;
|
|
needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury);
|
|
}
|
|
|
|
if (needsUpdate) {
|
|
initializeSystemDefaultCentury();
|
|
}
|
|
|
|
// use defaultCenturyStart unless it's the flag value;
|
|
// then use systemDefaultCenturyStart
|
|
|
|
return fgSystemDefaultCenturyStart;
|
|
}
|
|
|
|
int32_t
|
|
HebrewCalendar::internalGetDefaultCenturyStartYear() const
|
|
{
|
|
// lazy-evaluate systemDefaultCenturyStartYear
|
|
UBool needsUpdate;
|
|
{
|
|
Mutex m;
|
|
needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury);
|
|
}
|
|
|
|
if (needsUpdate) {
|
|
initializeSystemDefaultCentury();
|
|
}
|
|
|
|
// use defaultCenturyStart unless it's the flag value;
|
|
// then use systemDefaultCenturyStartYear
|
|
|
|
return fgSystemDefaultCenturyStartYear;
|
|
}
|
|
|
|
void
|
|
HebrewCalendar::initializeSystemDefaultCentury()
|
|
{
|
|
// initialize systemDefaultCentury and systemDefaultCenturyYear based
|
|
// on the current time. They'll be set to 80 years before
|
|
// the current time.
|
|
// No point in locking as it should be idempotent.
|
|
if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury)
|
|
{
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
HebrewCalendar calendar(Locale("@calendar=hebrew"),status);
|
|
if (U_SUCCESS(status))
|
|
{
|
|
calendar.setTime(Calendar::getNow(), status);
|
|
calendar.add(UCAL_YEAR, -80, status);
|
|
UDate newStart = calendar.getTime(status);
|
|
int32_t newYear = calendar.get(UCAL_YEAR, status);
|
|
{
|
|
Mutex m;
|
|
fgSystemDefaultCenturyStart = newStart;
|
|
fgSystemDefaultCenturyStartYear = newYear;
|
|
}
|
|
}
|
|
// We have no recourse upon failure unless we want to propagate the failure
|
|
// out.
|
|
}
|
|
}
|
|
|
|
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(HebrewCalendar)
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif // UCONFIG_NO_FORMATTING
|
|
|