| /* |
| ******************************************************************************* |
| * Copyright (C) 1996-2007, International Business Machines Corporation and * |
| * others. All Rights Reserved. * |
| ******************************************************************************* |
| */ |
| package com.ibm.icu.util; |
| import com.ibm.icu.util.TimeZone; |
| import com.ibm.icu.impl.CalendarCache; |
| 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 three days |
| * in order to prevent certain holidays from falling on the Sabbath and |
| * to prevent certain illegal year lengths. Finally, the lengths of certain |
| * months can vary depending on the number of days in the year. |
| * <p> |
| * The leap month is known as "Adar 1" and is inserted between the |
| * months of Shevat and Adar in leap years. Since the leap month does |
| * not come at the end of the year, calculations involving |
| * month numbers are particularly complex. Users of this class should |
| * make sure to use the {@link #roll roll} and {@link #add add} methods |
| * rather than attempting to perform date arithmetic by manipulating |
| * the fields directly. |
| * <p> |
| * <b>Note:</b> In the traditional Hebrew calendar, days start at sunset. |
| * However, in order to keep the time fields in this class |
| * synchronized with those of the other calendars and with local clock time, |
| * we treat days and months as beginning at midnight, |
| * roughly 6 hours after the corresponding sunset. |
| * <p> |
| * If you are interested in more information on the rules behind the Hebrew |
| * calendar, see one of the following references: |
| * <ul> |
| * <li>"<a href="http://www.amazon.com/exec/obidos/ASIN/0521564743">Calendrical Calculations</a>", |
| * by Nachum Dershowitz & Edward Reingold, Cambridge University Press, 1997, pages 85-91. |
| * |
| * <li>Hebrew Calendar Science and Myths, |
| * <a href="http://www.geocities.com/Athens/1584/"> |
| * http://www.geocities.com/Athens/1584/</a> |
| * |
| * <li>The Calendar FAQ, |
| * <a href="http://www.faqs.org/faqs/calendars/faq/"> |
| * http://www.faqs.org/faqs/calendars/faq/</a> |
| * </ul> |
| * |
| * <p> |
| * This class should not be subclassed.</p> |
| * <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>.</p> |
| * |
| * @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 |
| { 1, 1, 5000000, 5000000 }, // YEAR |
| { 0, 0, 12, 12 }, // MONTH |
| { 1, 1, 51, 56 }, // WEEK_OF_YEAR |
| { 0, 0, 5, 6 }, // WEEK_OF_MONTH |
| { 1, 1, 29, 30 }, // DAY_OF_MONTH |
| { 1, 1, 353, 385 }, // DAY_OF_YEAR |
| {/* */}, // DAY_OF_WEEK |
| { -1, -1, 4, 6 }, // DAY_OF_WEEK_IN_MONTH |
| {/* */}, // AM_PM |
| {/* */}, // HOUR |
| {/* */}, // HOUR_OF_DAY |
| {/* */}, // MINUTE |
| {/* */}, // SECOND |
| {/* */}, // MILLISECOND |
| {/* */}, // ZONE_OFFSET |
| {/* */}, // DST_OFFSET |
| { -5000001, -5000001, 5000001, 5000001 }, // YEAR_WOY |
| {/* */}, // DOW_LOCAL |
| { -5000000, -5000000, 5000000, 5000000 }, // EXTENDED_YEAR |
| {/* */}, // JULIAN_DAY |
| {/* */}, // MILLISECONDS_IN_DAY |
| }; |
| |
| /** |
| * 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 |
| }; |
| |
| //------------------------------------------------------------------------- |
| // 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 locale. |
| * @stable ICU 2.8 |
| */ |
| public HebrewCalendar() { |
| this(TimeZone.getDefault(), ULocale.getDefault()); |
| } |
| |
| /** |
| * Constructs a <code>HebrewCalendar</code> based on the current time |
| * in the given time zone with the default locale. |
| * |
| * @param zone The time zone for the new calendar. |
| * @stable ICU 2.8 |
| */ |
| public HebrewCalendar(TimeZone zone) { |
| this(zone, ULocale.getDefault()); |
| } |
| |
| /** |
| * 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.getDefault(), 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 3.8 |
| */ |
| public HebrewCalendar(ULocale locale) { |
| this(TimeZone.getDefault(), 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 3.8 |
| */ |
| 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 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. |
| * @stable ICU 2.8 |
| */ |
| public HebrewCalendar(int year, int month, int date) { |
| super(TimeZone.getDefault(), ULocale.getDefault()); |
| 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 locale. |
| * |
| * @param date The date to which the new calendar is set. |
| * @stable ICU 2.8 |
| */ |
| public HebrewCalendar(Date date) { |
| super(TimeZone.getDefault(), ULocale.getDefault()); |
| this.setTime(date); |
| } |
| |
| /** |
| * Constructs a <code>HebrewCalendar</code> with the given date |
| * and time set for the default time zone with the default 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. |
| * @stable ICU 2.8 |
| */ |
| public HebrewCalendar(int year, int month, int date, int hour, |
| int minute, int second) |
| { |
| super(TimeZone.getDefault(), ULocale.getDefault()); |
| 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 <tt>HebrewCalendar</tt>. 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 |
| */ |
| public void add(int field, int amount) |
| { |
| switch (field) { |
| case 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 <tt>HebrewCalendar</tt>. 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 |
| */ |
| public void roll(int field, int amount) |
| { |
| switch (field) { |
| case 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. |
| static private final int MONTH_DAYS = 29; |
| static private final long MONTH_FRACT = 12*HOUR_PARTS + 793; |
| static private 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). |
| static private 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) { |
| int months = (235 * year - 234) / 19; // # of months before year |
| |
| 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); |
| } |
| 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 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 |
| * |
| * 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. |
| */ |
| private static final boolean isLeapYear(int year) { |
| //return (year * 12 + 17) % 19 >= 12; |
| int x = (year*12 + 17) % 19; |
| return x >= ((x < 0) ? -7 : 12); |
| } |
| |
| private static int monthsInYear(int year) { |
| return isLeapYear(year) ? 13 : 12; |
| } |
| |
| //------------------------------------------------------------------------- |
| // Calendar framework |
| //------------------------------------------------------------------------- |
| |
| /** |
| * @stable ICU 2.8 |
| */ |
| 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 |
| */ |
| 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. |
| 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 |
| */ |
| protected int handleGetYearLength(int eyear) { |
| return (int)(startOfYear(eyear+1) - startOfYear(eyear)); |
| } |
| |
| //------------------------------------------------------------------------- |
| // 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 |
| */ |
| protected void handleComputeFields(int julianDay) { |
| long d = julianDay - 347997; |
| long m = (d * DAY_PARTS) / MONTH_PARTS; // Months (approx) |
| int year = (int)((19 * m + 234) / 235) + 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); |
| int monthStart[][] = isLeapYear(year) ? 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); |
| 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 |
| */ |
| 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 |
| */ |
| 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. |
| 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); |
| } |
| |
| /** |
| * Return the current Calendar type. |
| * @return type of calendar |
| * @draft ICU 3.8 |
| * @provisional This API might change or be removed in a future release. |
| */ |
| public String getType() { |
| return "hebrew"; |
| } |
| |
| /* |
| 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; |
| } |
| */ |
| } |
