HebrewCalendar.java
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 1996-2016, International Business Machines Corporation and
* others. All Rights Reserved.
*******************************************************************************
*/
package com.ibm.icu.util;
import com.ibm.icu.impl.CalendarCache;
import com.ibm.icu.util.ULocale.Category;
import java.util.Date;
import java.util.Locale;
/**
* <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 two
* 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://web.archive.org/web/20090423084613/http://www.geocities.com/Athens/1584/">
* http://web.archive.org/web/20090423084613/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>This class should not be subclassed.
*
* <p>HebrewCalendar usually should be instantiated using {@link
* com.ibm.icu.util.Calendar#getInstance(ULocale)} passing in a <code>ULocale</code> with the tag
* <code>"@calendar=hebrew"</code>.
*
* @see com.ibm.icu.util.GregorianCalendar
* @see com.ibm.icu.util.Calendar
* @author Laura Werner
* @author Alan Liu
* @stable ICU 2.8
*/
public class HebrewCalendar extends Calendar {
// jdk1.4.2 serialver
private static final long serialVersionUID = -1952524560588825816L;
// -------------------------------------------------------------------------
// Tons o' Constants...
// -------------------------------------------------------------------------
/**
* Constant for Tishri, the 1st month of the Hebrew year.
*
* @stable ICU 2.8
*/
public static final int TISHRI = 0;
/**
* Constant for Heshvan, the 2nd month of the Hebrew year.
*
* @stable ICU 2.8
*/
public static final int HESHVAN = 1;
/**
* Constant for Kislev, the 3rd month of the Hebrew year.
*
* @stable ICU 2.8
*/
public static final int KISLEV = 2;
/**
* Constant for Tevet, the 4th month of the Hebrew year.
*
* @stable ICU 2.8
*/
public static final int TEVET = 3;
/**
* Constant for Shevat, the 5th month of the Hebrew year.
*
* @stable ICU 2.8
*/
public static final int SHEVAT = 4;
/**
* 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).
*
* @stable ICU 2.8
*/
public static final int ADAR_1 = 5;
/**
* Constant for the Adar, the 7th month of the Hebrew year.
*
* @stable ICU 2.8
*/
public static final int ADAR = 6;
/**
* Constant for Nisan, the 8th month of the Hebrew year.
*
* @stable ICU 2.8
*/
public static final int NISAN = 7;
/**
* Constant for Iyar, the 9th month of the Hebrew year.
*
* @stable ICU 2.8
*/
public static final int IYAR = 8;
/**
* Constant for Sivan, the 10th month of the Hebrew year.
*
* @stable ICU 2.8
*/
public static final int SIVAN = 9;
/**
* Constant for Tammuz, the 11th month of the Hebrew year.
*
* @stable ICU 2.8
*/
public static final int TAMUZ = 10;
/**
* Constant for Av, the 12th month of the Hebrew year.
*
* @stable ICU 2.8
*/
public static final int AV = 11;
/**
* Constant for Elul, the 13th month of the Hebrew year.
*
* @stable ICU 2.8
*/
public static final int ELUL = 12;
/**
* The absolute date, in milliseconds since 1/1/1970 AD, Gregorian, of the start of the Hebrew
* calendar. In order to keep this calendar's time of day in sync with that of the Gregorian
* calendar, we use midnight, rather than sunset the day before.
*/
// private static final long EPOCH_MILLIS = -180799862400000L; // 1/1/1 HY
private static final int LIMITS[][] = {
// Minimum Greatest Least Maximum
// Minimum Maximum
{0, 0, 0, 0}, // ERA
{-5000000, -5000000, 5000000, 5000000}, // YEAR
{0, 0, 12, 12}, // MONTH
{1, 1, 51, 56}, // WEEK_OF_YEAR
{
/* */
}, // WEEK_OF_MONTH
{1, 1, 29, 30}, // DAY_OF_MONTH
{1, 1, 353, 385}, // DAY_OF_YEAR
{
/* */
}, // DAY_OF_WEEK
{-1, -1, 5, 5}, // DAY_OF_WEEK_IN_MONTH
{
/* */
}, // AM_PM
{
/* */
}, // HOUR
{
/* */
}, // HOUR_OF_DAY
{
/* */
}, // MINUTE
{
/* */
}, // SECOND
{
/* */
}, // MILLISECOND
{
/* */
}, // ZONE_OFFSET
{
/* */
}, // DST_OFFSET
{-5000000, -5000000, 5000000, 5000000}, // YEAR_WOY
{
/* */
}, // DOW_LOCAL
{-5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR
{
/* */
}, // JULIAN_DAY
{
/* */
}, // MILLISECONDS_IN_DAY
{
/* */
}, // IS_LEAP_MONTH
{0, 0, 11, 12}, // ORDINAL_MONTH
};
/**
* The lengths of the Hebrew months. This is complicated, because there are three different
* types of years, or six if you count leap years. Due to the rules for postponing the start of
* the year to avoid having certain holidays fall on the sabbath, the year can end up being
* three different lengths, called "deficient", "normal", and "complete".
*/
private static final int MONTH_LENGTH[][] = {
// Deficient Normal Complete
{30, 30, 30}, // Tishri
{29, 29, 30}, // Heshvan
{29, 30, 30}, // Kislev
{29, 29, 29}, // Tevet
{30, 30, 30}, // Shevat
{30, 30, 30}, // Adar I (leap years only)
{29, 29, 29}, // Adar
{30, 30, 30}, // Nisan
{29, 29, 29}, // Iyar
{30, 30, 30}, // Sivan
{29, 29, 29}, // Tammuz
{30, 30, 30}, // Av
{29, 29, 29}, // Elul
};
/**
* The cumulative # of days to the end of each month in a non-leap year Although this can be
* calculated from the MONTH_LENGTH table, keeping it around separately makes some calculations
* a lot faster
*/
private static final int MONTH_START[][] = {
// Deficient Normal Complete
{0, 0, 0}, // (placeholder)
{30, 30, 30}, // Tishri
{59, 59, 60}, // Heshvan
{88, 89, 90}, // Kislev
{117, 118, 119}, // Tevet
{147, 148, 149}, // Shevat
{147, 148, 149}, // (Adar I placeholder)
{176, 177, 178}, // Adar
{206, 207, 208}, // Nisan
{235, 236, 237}, // Iyar
{265, 266, 267}, // Sivan
{294, 295, 296}, // Tammuz
{324, 325, 326}, // Av
{353, 354, 355}, // Elul
};
/** The cumulative # of days to the end of each month in a leap year */
private static final int LEAP_MONTH_START[][] = {
// Deficient Normal Complete
{0, 0, 0}, // (placeholder)
{30, 30, 30}, // Tishri
{59, 59, 60}, // Heshvan
{88, 89, 90}, // Kislev
{117, 118, 119}, // Tevet
{147, 148, 149}, // Shevat
{177, 178, 179}, // Adar I
{206, 207, 208}, // Adar II
{236, 237, 238}, // Nisan
{265, 266, 267}, // Iyar
{295, 296, 297}, // Sivan
{324, 325, 326}, // Tammuz
{354, 355, 356}, // Av
{383, 384, 385}, // Elul
};
private static final int MONTHS_IN_CYCLE = 235;
private static final int YEARS_IN_CYCLE = 19;
// -------------------------------------------------------------------------
// Data Members...
// -------------------------------------------------------------------------
private static CalendarCache cache = new CalendarCache();
// -------------------------------------------------------------------------
// Constructors...
// -------------------------------------------------------------------------
/**
* Constructs a default <code>HebrewCalendar</code> using the current time in the default time
* zone with the default <code>FORMAT</code> locale.
*
* @see Category#FORMAT
* @stable ICU 2.8
*/
public HebrewCalendar() {
this(TimeZone.getDefault(), ULocale.getDefault(Category.FORMAT));
}
/**
* Constructs a <code>HebrewCalendar</code> based on the current time in the given time zone
* with the default <code>FORMAT</code> locale.
*
* @param zone The time zone for the new calendar.
* @see Category#FORMAT
* @stable ICU 2.8
*/
public HebrewCalendar(TimeZone zone) {
this(zone, ULocale.getDefault(Category.FORMAT));
}
/**
* Constructs a <code>HebrewCalendar</code> based on the current time in the default time zone
* with the given locale.
*
* @param aLocale The locale for the new calendar.
* @stable ICU 2.8
*/
public HebrewCalendar(Locale aLocale) {
this(TimeZone.forLocaleOrDefault(aLocale), aLocale);
}
/**
* Constructs a <code>HebrewCalendar</code> based on the current time in the default time zone
* with the given locale.
*
* @param locale The locale for the new calendar.
* @stable ICU 3.2
*/
public HebrewCalendar(ULocale locale) {
this(TimeZone.forULocaleOrDefault(locale), locale);
}
/**
* Constructs a <code>HebrewCalendar</code> based on the current time in the given time zone
* with the given locale.
*
* @param zone The time zone for the new calendar.
* @param aLocale The locale for the new calendar.
* @stable ICU 2.8
*/
public HebrewCalendar(TimeZone zone, Locale aLocale) {
super(zone, aLocale);
setTimeInMillis(System.currentTimeMillis());
}
/**
* Constructs a <code>HebrewCalendar</code> based on the current time in the given time zone
* with the given locale.
*
* @param zone The time zone for the new calendar.
* @param locale The locale for the new calendar.
* @stable ICU 3.2
*/
public HebrewCalendar(TimeZone zone, ULocale locale) {
super(zone, locale);
setTimeInMillis(System.currentTimeMillis());
}
/**
* Constructs a <code>HebrewCalendar</code> with the given date set in the default time zone
* with the default <code>FORMAT</code> locale.
*
* @param year The value used to set the calendar's {@link #YEAR YEAR} time field.
* @param month The value used to set the calendar's {@link #MONTH MONTH} time field. The value
* is 0-based. e.g., 0 for Tishri.
* @param date The value used to set the calendar's {@link #DATE DATE} time field.
* @see Category#FORMAT
* @stable ICU 2.8
*/
public HebrewCalendar(int year, int month, int date) {
super(TimeZone.getDefault(), ULocale.getDefault(Category.FORMAT));
this.set(YEAR, year);
this.set(MONTH, month);
this.set(DATE, date);
}
/**
* Constructs a <code>HebrewCalendar</code> with the given date set in the default time zone
* with the default <code>FORMAT</code> locale.
*
* @param date The date to which the new calendar is set.
* @see Category#FORMAT
* @stable ICU 2.8
*/
public HebrewCalendar(Date date) {
super(TimeZone.getDefault(), ULocale.getDefault(Category.FORMAT));
this.setTime(date);
}
/**
* Constructs a <code>HebrewCalendar</code> with the given date and time set for the default
* time zone with the default <code>FORMAT</code> locale.
*
* @param year The value used to set the calendar's {@link #YEAR YEAR} time field.
* @param month The value used to set the calendar's {@link #MONTH MONTH} time field. The value
* is 0-based. e.g., 0 for Tishri.
* @param date The value used to set the calendar's {@link #DATE DATE} time field.
* @param hour The value used to set the calendar's {@link #HOUR_OF_DAY HOUR_OF_DAY} time field.
* @param minute The value used to set the calendar's {@link #MINUTE MINUTE} time field.
* @param second The value used to set the calendar's {@link #SECOND SECOND} time field.
* @see Category#FORMAT
* @stable ICU 2.8
*/
public HebrewCalendar(int year, int month, int date, int hour, int minute, int second) {
super(TimeZone.getDefault(), ULocale.getDefault(Category.FORMAT));
this.set(YEAR, year);
this.set(MONTH, month);
this.set(DATE, date);
this.set(HOUR_OF_DAY, hour);
this.set(MINUTE, minute);
this.set(SECOND, second);
}
// -------------------------------------------------------------------------
// Rolling and adding functions overridden from Calendar
//
// These methods call through to the default implementation in IBMCalendar
// for most of the fields and only handle the unusual ones themselves.
// -------------------------------------------------------------------------
/**
* Add a signed amount to a specified field, using this calendar's rules. For example, to add
* three days to the current date, you can call <code>add(Calendar.DATE, 3)</code>.
*
* <p>When adding to certain fields, the values of other fields may conflict and need to be
* changed. For example, when adding one to the {@link #MONTH MONTH} field for the date "30 Av
* 5758", the {@link #DAY_OF_MONTH DAY_OF_MONTH} field must be adjusted so that the result is
* "29 Elul 5758" rather than the invalid "30 Elul 5758".
*
* <p>This method is able to add to all fields except for {@link #ERA ERA}, {@link #DST_OFFSET
* DST_OFFSET}, and {@link #ZONE_OFFSET ZONE_OFFSET}.
*
* <p><b>Note:</b> You should always use {@link #roll roll} and add rather than attempting to
* perform arithmetic operations directly on the fields of a {@code HebrewCalendar}. Since the
* {@link #MONTH MONTH} field behaves discontinuously in non-leap years, simple arithmetic can
* give invalid results.
*
* <p>
*
* @param field the time field.
* @param amount the amount to add to the field.
* @exception IllegalArgumentException if the field is invalid or refers to a field that cannot
* be handled by this method.
* @stable ICU 2.8
*/
@Override
public void add(int field, int amount) {
switch (field) {
case MONTH:
case ORDINAL_MONTH:
{
// We can't just do a set(MONTH, get(MONTH) + amount). The
// reason is ADAR_1. Suppose amount is +2 and we land in
// ADAR_1 -- then we have to bump to ADAR_2 aka ADAR. But
// if amount is -2 and we land in ADAR_1, then we have to
// bump the other way -- down to SHEVAT. - Alan 11/00
int month = get(MONTH);
int year = get(YEAR);
boolean acrossAdar1;
if (amount > 0) {
acrossAdar1 = (month < ADAR_1); // started before ADAR_1?
month += amount;
for (; ; ) {
if (acrossAdar1 && month >= ADAR_1 && !isLeapYear(year)) {
++month;
}
if (month <= ELUL) {
break;
}
month -= ELUL + 1;
++year;
acrossAdar1 = true;
}
} else {
acrossAdar1 = (month > ADAR_1); // started after ADAR_1?
month += amount;
for (; ; ) {
if (acrossAdar1 && month <= ADAR_1 && !isLeapYear(year)) {
--month;
}
if (month >= 0) {
break;
}
month += ELUL + 1;
--year;
acrossAdar1 = true;
}
}
set(MONTH, month);
set(YEAR, year);
pinField(DAY_OF_MONTH);
break;
}
default:
super.add(field, amount);
break;
}
}
/**
* Rolls (up/down) a specified amount time on the given field. For example, to roll the current
* date up by three days, you can call <code>roll(Calendar.DATE, 3)</code>. If the field is
* rolled past its maximum allowable value, it will "wrap" back to its minimum and continue
* rolling. For example, calling <code>roll(Calendar.DATE, 10)</code> on a Hebrew calendar set
* to "25 Av 5758" will result in the date "5 Av 5758".
*
* <p>When rolling certain fields, the values of other fields may conflict and need to be
* changed. For example, when rolling the {@link #MONTH MONTH} field upward by one for the date
* "30 Av 5758", the {@link #DAY_OF_MONTH DAY_OF_MONTH} field must be adjusted so that the
* result is "29 Elul 5758" rather than the invalid "30 Elul".
*
* <p>This method is able to roll all fields except for {@link #ERA ERA}, {@link #DST_OFFSET
* DST_OFFSET}, and {@link #ZONE_OFFSET ZONE_OFFSET}. Subclasses may, of course, add support for
* additional fields in their overrides of <code>roll</code>.
*
* <p><b>Note:</b> You should always use roll and {@link #add add} rather than attempting to
* perform arithmetic operations directly on the fields of a {@code HebrewCalendar}. Since the
* {@link #MONTH MONTH} field behaves discontinuously in non-leap years, simple arithmetic can
* give invalid results.
*
* <p>
*
* @param field the time field.
* @param amount the amount by which the field should be rolled.
* @exception IllegalArgumentException if the field is invalid or refers to a field that cannot
* be handled by this method.
* @stable ICU 2.8
*/
@Override
public void roll(int field, int amount) {
switch (field) {
case MONTH:
case ORDINAL_MONTH:
{
int month = get(MONTH);
int year = get(YEAR);
boolean leapYear = isLeapYear(year);
int yearLength = monthsInYear(year);
int newMonth = month + (amount % yearLength);
//
// If it's not a leap year and we're rolling past the missing month
// of ADAR_1, we need to roll an extra month to make up for it.
//
if (!leapYear) {
if (amount > 0 && month < ADAR_1 && newMonth >= ADAR_1) {
newMonth++;
} else if (amount < 0 && month > ADAR_1 && newMonth <= ADAR_1) {
newMonth--;
}
}
set(MONTH, (newMonth + 13) % 13);
pinField(DAY_OF_MONTH);
return;
}
default:
super.roll(field, amount);
}
}
// -------------------------------------------------------------------------
// Support methods
// -------------------------------------------------------------------------
// Hebrew date calculations are performed in terms of days, hours, and
// "parts" (or halakim), which are 1/1080 of an hour, or 3 1/3 seconds.
private static final long HOUR_PARTS = 1080;
private static final long DAY_PARTS = 24 * HOUR_PARTS;
// An approximate value for the length of a lunar month.
// It is used to calculate the approximate year and month of a given
// absolute date.
private static final int MONTH_DAYS = 29;
private static final long MONTH_FRACT = 12 * HOUR_PARTS + 793;
private static final long MONTH_PARTS = MONTH_DAYS * DAY_PARTS + MONTH_FRACT;
// The time of the new moon (in parts) on 1 Tishri, year 1 (the epoch)
// counting from noon on the day before. BAHARAD is an abbreviation of
// Bet (Monday), Hey (5 hours from sunset), Resh-Daled (204).
private static final long BAHARAD = 11 * HOUR_PARTS + 204;
/**
* 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>
*/
private static long startOfYear(int year) {
long day = cache.get(year);
if (day == CalendarCache.EMPTY) {
// # of months before year
int months =
(int)
floorDivide(
(MONTHS_IN_CYCLE * (long) year - (MONTHS_IN_CYCLE - 1)),
YEARS_IN_CYCLE);
long frac = months * MONTH_FRACT + BAHARAD; // Fractional part of day #
day = months * 29 + (frac / DAY_PARTS); // Whole # part of calculation
frac = frac % DAY_PARTS; // Time of day
int wd = (int) (day % 7); // Day of week (0 == Monday)
if (wd == 2 || wd == 4 || wd == 6) {
// If the 1st is on Sun, Wed, or Fri, postpone to the next day
day += 1;
wd = (int) (day % 7);
} else if (wd == 1 && frac > 15 * HOUR_PARTS + 204 && !isLeapYear(year)) {
// If the new moon falls after 3:11:20am (15h204p from the previous noon)
// on a Tuesday and it is not a leap year, postpone by 2 days.
// This prevents 356-day years.
day += 2;
} else if (wd == 0 && frac > 21 * HOUR_PARTS + 589 && isLeapYear(year - 1)) {
// If the new moon falls after 9:32:43 1/3am (21h589p from yesterday noon)
// on a Monday and *last* year was a leap year, postpone by 1 day.
// Prevents 382-day years.
day += 1;
}
cache.put(year, day);
}
return day;
}
/*
* Find the day of the week for a given day
*
* @param day The # of days since the start of the Hebrew calendar,
* 1-based (i.e. 1/1/1 AM is day 1).
*/
/*private static int absoluteDayToDayOfWeek(long day)
{
// We know that 1/1/1 AM is a Monday, which makes the math easy...
return (int)(day % 7) + 1;
}*/
/**
* Returns the type of a given year. 0 "Deficient" year with 353 or 383 days 1 "Normal" year
* with 354 or 384 days 2 "Complete" year with 355 or 385 days
*/
private final int yearType(int year) {
int yearLength = handleGetYearLength(year);
if (yearLength > 380) {
yearLength -= 30; // Subtract length of leap month.
}
int type = 0;
switch (yearLength) {
case 353:
type = 0;
break;
case 354:
type = 1;
break;
case 355:
type = 2;
break;
default:
throw new IllegalArgumentException(
"Illegal year length " + yearLength + " in year " + year);
}
return type;
}
/**
* Determine whether a given Hebrew year is a leap year
*
* <p>The rule here is that if (year % 19) == 0, 3, 6, 8, 11, 14, or 17. The formula below
* performs the same test, believe it or not.
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
public static boolean isLeapYear(int year) {
// return (year * 12 + 17) % 19 >= 12;
int x = (year * 12 + 17) % YEARS_IN_CYCLE;
return x >= ((x < 0) ? -7 : 12);
}
private static int monthsInYear(int year) {
return isLeapYear(year) ? 13 : 12;
}
// -------------------------------------------------------------------------
// Calendar framework
// -------------------------------------------------------------------------
/**
* @stable ICU 2.8
*/
@Override
protected int handleGetLimit(int field, int limitType) {
return LIMITS[field][limitType];
}
/**
* Returns the length of the given month in the given year
*
* @stable ICU 2.8
*/
@Override
protected int handleGetMonthLength(int extendedYear, int month) {
// 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.
if (month <= -MONTHS_IN_CYCLE || MONTHS_IN_CYCLE <= month) {
extendedYear += (month / MONTHS_IN_CYCLE) * YEARS_IN_CYCLE;
month = month % MONTHS_IN_CYCLE;
}
while (month < 0) {
month += monthsInYear(--extendedYear);
}
// Careful: allow 0..12 in all years
while (month > 12) {
month -= monthsInYear(extendedYear++);
}
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
*
* @stable ICU 2.8
*/
@Override
protected int handleGetYearLength(int eyear) {
return (int) (startOfYear(eyear + 1) - startOfYear(eyear));
}
/**
* {@inheritDoc}
*
* <p>Overrides {@link Calendar#validateField(int)} to provide special handling for month
* validation for Hebrew calendar.
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Override
@Deprecated
protected void validateField(int field) {
if ((field == MONTH || field == ORDINAL_MONTH)
&& !isLeapYear(handleGetExtendedYear())
&& internalGetMonth() == ADAR_1) {
throw new IllegalArgumentException("MONTH cannot be ADAR_1(5) except leap years");
}
super.validateField(field);
}
// -------------------------------------------------------------------------
// 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.
*
* @stable ICU 2.8
*/
@Override
protected void handleComputeFields(int julianDay) {
long d = julianDay - 347997;
long m = floorDivide((d * DAY_PARTS), MONTH_PARTS); // Months (approx)
int year =
(int)
(floorDivide((YEARS_IN_CYCLE * m + (MONTHS_IN_CYCLE - 1)), MONTHS_IN_CYCLE)
+ 1); // Years (approx)
long ys = startOfYear(year); // 1st day of year
int dayOfYear = (int) (d - ys);
// Because of the postponement rules, it's possible to guess wrong. Fix it.
while (dayOfYear < 1) {
year--;
ys = startOfYear(year);
dayOfYear = (int) (d - ys);
}
// Now figure out which month we're in, and the date within that month
int yearType = yearType(year);
boolean isLeap = isLeapYear(year);
int monthStart[][] = isLeap ? LEAP_MONTH_START : MONTH_START;
int month = 0;
while (dayOfYear > monthStart[month][yearType]) {
month++;
}
month--;
int dayOfMonth = dayOfYear - monthStart[month][yearType];
internalSet(ERA, 0);
internalSet(YEAR, year);
internalSet(EXTENDED_YEAR, year);
int ordinal_month = month;
if (!isLeap && ordinal_month > ADAR_1) {
ordinal_month--;
}
internalSet(ORDINAL_MONTH, ordinal_month);
internalSet(MONTH, month);
internalSet(DAY_OF_MONTH, dayOfMonth);
internalSet(DAY_OF_YEAR, dayOfYear);
}
// -------------------------------------------------------------------------
// Functions for converting from field values to milliseconds
// -------------------------------------------------------------------------
/**
* @stable ICU 2.8
*/
@Override
protected int handleGetExtendedYear() {
int year;
if (newerField(EXTENDED_YEAR, YEAR) == EXTENDED_YEAR) {
year = internalGet(EXTENDED_YEAR, 1); // Default to year 1
} else {
year = internalGet(YEAR, 1); // Default to year 1
}
return year;
}
/**
* Return JD of start of given month/year.
*
* @stable ICU 2.8
*/
@Override
protected int handleComputeMonthStart(int eyear, int month, boolean useMonth) {
// 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.
if (month <= -MONTHS_IN_CYCLE || MONTHS_IN_CYCLE <= month) {
eyear += (month / MONTHS_IN_CYCLE) * YEARS_IN_CYCLE;
month = month % MONTHS_IN_CYCLE;
}
while (month < 0) {
month += monthsInYear(--eyear);
}
// Careful: allow 0..12 in all years
while (month > 12) {
month -= monthsInYear(eyear++);
}
long day = startOfYear(eyear);
if (month != 0) {
if (isLeapYear(eyear)) {
day += LEAP_MONTH_START[month][yearType(eyear)];
} else {
day += MONTH_START[month][yearType(eyear)];
}
}
return (int) (day + 347997);
}
/**
* {@inheritDoc}
*
* @stable ICU 3.8
*/
@Override
public String getType() {
return "hebrew";
}
private static final int HEBREW_CALENDAR_RELATED_YEAR_DIFFERENCE = -3760;
/**
* @internal
* @deprecated This API is ICU internal only.
*/
@Override
@Deprecated
protected final int getRelatedYearDifference() {
return HEBREW_CALENDAR_RELATED_YEAR_DIFFERENCE;
}
// -------------------------------------------------------------------------
// Temporal Calendar API.
// -------------------------------------------------------------------------
/**
* {@inheritDoc}
*
* @stable ICU 74
*/
@Override
public boolean inTemporalLeapYear() {
return isLeapYear(get(EXTENDED_YEAR));
}
private static String[] gTemporalMonthCodesForHebrew = {
"M01", "M02", "M03", "M04", "M05", "M05L", "M06", "M07", "M08", "M09", "M10", "M11", "M12"
};
/**
* Gets The Temporal monthCode value corresponding to the month for the date. The value is a
* string identifier that starts with the literal grapheme "M" followed by two graphemes
* representing the zero-padded month number of the current month in a normal (non-leap) year
* and suffixed by an optional literal grapheme "L" if this is a leap month in a lunisolar
* calendar. For the Hebrew calendar, the values are "M01" .. "M12" for non-leap year, and "M01"
* .. "M05", "M05L", "M06" .. "M12" for leap year.
*
* @return One of 13 possible strings in {"M01".. "M05", "M05L", "M06" .. "M12"}.
* @stable ICU 74
*/
@Override
public String getTemporalMonthCode() {
return gTemporalMonthCodesForHebrew[get(MONTH)];
}
/**
* Sets The Temporal monthCode which is a string identifier that starts with the literal
* grapheme "M" followed by two graphemes representing the zero-padded month number of the
* current month in a normal (non-leap) year and suffixed by an optional literal grapheme "L" if
* this is a leap month in a lunisolar calendar. For Hebrew calendar, the values are "M01" ..
* "M12" for non-leap years, and "M01" .. "M05", "M05L", "M06" .. "M12" for leap year.
*
* @param temporalMonth The value to be set for temporal monthCode.
* @stable ICU 74
*/
@Override
public void setTemporalMonthCode(String temporalMonth) {
if (temporalMonth.length() == 3 || temporalMonth.length() == 4) {
for (int m = 0; m < gTemporalMonthCodesForHebrew.length; m++) {
if (temporalMonth.equals(gTemporalMonthCodesForHebrew[m])) {
set(MONTH, m);
return;
}
}
}
throw new IllegalArgumentException("Incorrect temporal Month code: " + temporalMonth);
}
// -------------------------------------------------------------------------
// End of Temporal Calendar API
// -------------------------------------------------------------------------
/**
* {@inheritDoc}
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Override
@Deprecated
protected int internalGetMonth() {
if (resolveFields(MONTH_PRECEDENCE) == ORDINAL_MONTH) {
int ordinalMonth = internalGet(ORDINAL_MONTH);
int year = handleGetExtendedYear();
return ordinalMonth + (((!isLeapYear(year)) && (ordinalMonth > ADAR_1)) ? 1 : 0);
}
return super.internalGetMonth();
}
/*
private static CalendarFactory factory;
public static CalendarFactory factory() {
if (factory == null) {
factory = new CalendarFactory() {
public Calendar create(TimeZone tz, ULocale loc) {
return new HebrewCalendar(tz, loc);
}
public String factoryName() {
return "Hebrew";
}
};
}
return factory;
}
*/
}