| /* |
| * Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.util.calendar; |
| |
| import java.util.Locale; |
| import java.util.TimeZone; |
| |
| /** |
| * The <code>BaseCalendar</code> provides basic calendar calculation |
| * functions to support the Julian, Gregorian, and Gregorian-based |
| * calendar systems. |
| * |
| * @author Masayoshi Okutsu |
| * @since 1.5 |
| */ |
| |
| public abstract class BaseCalendar extends AbstractCalendar { |
| |
| public static final int JANUARY = 1; |
| public static final int FEBRUARY = 2; |
| public static final int MARCH = 3; |
| public static final int APRIL = 4; |
| public static final int MAY = 5; |
| public static final int JUNE = 6; |
| public static final int JULY = 7; |
| public static final int AUGUST = 8; |
| public static final int SEPTEMBER = 9; |
| public static final int OCTOBER = 10; |
| public static final int NOVEMBER = 11; |
| public static final int DECEMBER = 12; |
| |
| // day of week constants |
| public static final int SUNDAY = 1; |
| public static final int MONDAY = 2; |
| public static final int TUESDAY = 3; |
| public static final int WEDNESDAY = 4; |
| public static final int THURSDAY = 5; |
| public static final int FRIDAY = 6; |
| public static final int SATURDAY = 7; |
| |
| // The base Gregorian year of FIXED_DATES[] |
| private static final int BASE_YEAR = 1970; |
| |
| // Pre-calculated fixed dates of January 1 from BASE_YEAR |
| // (Gregorian). This table covers all the years that can be |
| // supported by the POSIX time_t (32-bit) after the Epoch. Note |
| // that the data type is int[]. |
| private static final int[] FIXED_DATES = { |
| 719163, // 1970 |
| 719528, // 1971 |
| 719893, // 1972 |
| 720259, // 1973 |
| 720624, // 1974 |
| 720989, // 1975 |
| 721354, // 1976 |
| 721720, // 1977 |
| 722085, // 1978 |
| 722450, // 1979 |
| 722815, // 1980 |
| 723181, // 1981 |
| 723546, // 1982 |
| 723911, // 1983 |
| 724276, // 1984 |
| 724642, // 1985 |
| 725007, // 1986 |
| 725372, // 1987 |
| 725737, // 1988 |
| 726103, // 1989 |
| 726468, // 1990 |
| 726833, // 1991 |
| 727198, // 1992 |
| 727564, // 1993 |
| 727929, // 1994 |
| 728294, // 1995 |
| 728659, // 1996 |
| 729025, // 1997 |
| 729390, // 1998 |
| 729755, // 1999 |
| 730120, // 2000 |
| 730486, // 2001 |
| 730851, // 2002 |
| 731216, // 2003 |
| 731581, // 2004 |
| 731947, // 2005 |
| 732312, // 2006 |
| 732677, // 2007 |
| 733042, // 2008 |
| 733408, // 2009 |
| 733773, // 2010 |
| 734138, // 2011 |
| 734503, // 2012 |
| 734869, // 2013 |
| 735234, // 2014 |
| 735599, // 2015 |
| 735964, // 2016 |
| 736330, // 2017 |
| 736695, // 2018 |
| 737060, // 2019 |
| 737425, // 2020 |
| 737791, // 2021 |
| 738156, // 2022 |
| 738521, // 2023 |
| 738886, // 2024 |
| 739252, // 2025 |
| 739617, // 2026 |
| 739982, // 2027 |
| 740347, // 2028 |
| 740713, // 2029 |
| 741078, // 2030 |
| 741443, // 2031 |
| 741808, // 2032 |
| 742174, // 2033 |
| 742539, // 2034 |
| 742904, // 2035 |
| 743269, // 2036 |
| 743635, // 2037 |
| 744000, // 2038 |
| 744365, // 2039 |
| }; |
| |
| public abstract static class Date extends CalendarDate { |
| protected Date() { |
| super(); |
| } |
| protected Date(TimeZone zone) { |
| super(zone); |
| } |
| |
| public Date setNormalizedDate(int normalizedYear, int month, int dayOfMonth) { |
| setNormalizedYear(normalizedYear); |
| setMonth(month).setDayOfMonth(dayOfMonth); |
| return this; |
| } |
| |
| public abstract int getNormalizedYear(); |
| |
| public abstract void setNormalizedYear(int normalizedYear); |
| |
| // Cache for the fixed date of January 1 and year length of the |
| // cachedYear. A simple benchmark showed 7% performance |
| // improvement with >90% cache hit. The initial values are for Gregorian. |
| int cachedYear = 2004; |
| long cachedFixedDateJan1 = 731581L; |
| long cachedFixedDateNextJan1 = cachedFixedDateJan1 + 366; |
| |
| protected final boolean hit(int year) { |
| return year == cachedYear; |
| } |
| |
| protected final boolean hit(long fixedDate) { |
| return (fixedDate >= cachedFixedDateJan1 && |
| fixedDate < cachedFixedDateNextJan1); |
| } |
| protected int getCachedYear() { |
| return cachedYear; |
| } |
| |
| protected long getCachedJan1() { |
| return cachedFixedDateJan1; |
| } |
| |
| protected void setCache(int year, long jan1, int len) { |
| cachedYear = year; |
| cachedFixedDateJan1 = jan1; |
| cachedFixedDateNextJan1 = jan1 + len; |
| } |
| } |
| |
| public boolean validate(CalendarDate date) { |
| Date bdate = (Date) date; |
| if (bdate.isNormalized()) { |
| return true; |
| } |
| int month = bdate.getMonth(); |
| if (month < JANUARY || month > DECEMBER) { |
| return false; |
| } |
| int d = bdate.getDayOfMonth(); |
| if (d <= 0 || d > getMonthLength(bdate.getNormalizedYear(), month)) { |
| return false; |
| } |
| int dow = bdate.getDayOfWeek(); |
| if (dow != bdate.FIELD_UNDEFINED && dow != getDayOfWeek(bdate)) { |
| return false; |
| } |
| |
| if (!validateTime(date)) { |
| return false; |
| } |
| |
| bdate.setNormalized(true); |
| return true; |
| } |
| |
| public boolean normalize(CalendarDate date) { |
| if (date.isNormalized()) { |
| return true; |
| } |
| |
| Date bdate = (Date) date; |
| TimeZone zi = bdate.getZone(); |
| |
| // If the date has a time zone, then we need to recalculate |
| // the calendar fields. Let getTime() do it. |
| if (zi != null) { |
| getTime(date); |
| return true; |
| } |
| |
| int days = normalizeTime(bdate); |
| normalizeMonth(bdate); |
| long d = (long)bdate.getDayOfMonth() + days; |
| int m = bdate.getMonth(); |
| int y = bdate.getNormalizedYear(); |
| int ml = getMonthLength(y, m); |
| |
| if (!(d > 0 && d <= ml)) { |
| if (d <= 0 && d > -28) { |
| ml = getMonthLength(y, --m); |
| d += ml; |
| bdate.setDayOfMonth((int) d); |
| if (m == 0) { |
| m = DECEMBER; |
| bdate.setNormalizedYear(y - 1); |
| } |
| bdate.setMonth(m); |
| } else if (d > ml && d < (ml + 28)) { |
| d -= ml; |
| ++m; |
| bdate.setDayOfMonth((int)d); |
| if (m > DECEMBER) { |
| bdate.setNormalizedYear(y + 1); |
| m = JANUARY; |
| } |
| bdate.setMonth(m); |
| } else { |
| long fixedDate = d + getFixedDate(y, m, 1, bdate) - 1L; |
| getCalendarDateFromFixedDate(bdate, fixedDate); |
| } |
| } else { |
| bdate.setDayOfWeek(getDayOfWeek(bdate)); |
| } |
| date.setLeapYear(isLeapYear(bdate.getNormalizedYear())); |
| date.setZoneOffset(0); |
| date.setDaylightSaving(0); |
| bdate.setNormalized(true); |
| return true; |
| } |
| |
| void normalizeMonth(CalendarDate date) { |
| Date bdate = (Date) date; |
| int year = bdate.getNormalizedYear(); |
| long month = bdate.getMonth(); |
| if (month <= 0) { |
| long xm = 1L - month; |
| year -= (int)((xm / 12) + 1); |
| month = 13 - (xm % 12); |
| bdate.setNormalizedYear(year); |
| bdate.setMonth((int) month); |
| } else if (month > DECEMBER) { |
| year += (int)((month - 1) / 12); |
| month = ((month - 1)) % 12 + 1; |
| bdate.setNormalizedYear(year); |
| bdate.setMonth((int) month); |
| } |
| } |
| |
| /** |
| * Returns 366 if the specified date is in a leap year, or 365 |
| * otherwise This method does not perform the normalization with |
| * the specified <code>CalendarDate</code>. The |
| * <code>CalendarDate</code> must be normalized to get a correct |
| * value. |
| * |
| * @param a <code>CalendarDate</code> |
| * @return a year length in days |
| * @throws ClassCastException if the specified date is not a |
| * {@link BaseCalendar.Date} |
| */ |
| public int getYearLength(CalendarDate date) { |
| return isLeapYear(((Date)date).getNormalizedYear()) ? 366 : 365; |
| } |
| |
| public int getYearLengthInMonths(CalendarDate date) { |
| return 12; |
| } |
| |
| static final int[] DAYS_IN_MONTH |
| // 12 1 2 3 4 5 6 7 8 9 10 11 12 |
| = { 31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; |
| static final int[] ACCUMULATED_DAYS_IN_MONTH |
| // 12/1 1/1 2/1 3/1 4/1 5/1 6/1 7/1 8/1 9/1 10/1 11/1 12/1 |
| = { -30, 0, 31, 59, 90,120,151,181,212,243, 273, 304, 334}; |
| |
| static final int[] ACCUMULATED_DAYS_IN_MONTH_LEAP |
| // 12/1 1/1 2/1 3/1 4/1 5/1 6/1 7/1 8/1 9/1 10/1 11/1 12/1 |
| = { -30, 0, 31, 59+1, 90+1,120+1,151+1,181+1,212+1,243+1, 273+1, 304+1, 334+1}; |
| |
| public int getMonthLength(CalendarDate date) { |
| Date gdate = (Date) date; |
| int month = gdate.getMonth(); |
| if (month < JANUARY || month > DECEMBER) { |
| throw new IllegalArgumentException("Illegal month value: " + month); |
| } |
| return getMonthLength(gdate.getNormalizedYear(), month); |
| } |
| |
| // accepts 0 (December in the previous year) to 12. |
| private final int getMonthLength(int year, int month) { |
| int days = DAYS_IN_MONTH[month]; |
| if (month == FEBRUARY && isLeapYear(year)) { |
| days++; |
| } |
| return days; |
| } |
| |
| public long getDayOfYear(CalendarDate date) { |
| return getDayOfYear(((Date)date).getNormalizedYear(), |
| date.getMonth(), |
| date.getDayOfMonth()); |
| } |
| |
| final long getDayOfYear(int year, int month, int dayOfMonth) { |
| return (long) dayOfMonth |
| + (isLeapYear(year) ? |
| ACCUMULATED_DAYS_IN_MONTH_LEAP[month] : ACCUMULATED_DAYS_IN_MONTH[month]); |
| } |
| |
| // protected |
| public long getFixedDate(CalendarDate date) { |
| if (!date.isNormalized()) { |
| normalizeMonth(date); |
| } |
| return getFixedDate(((Date)date).getNormalizedYear(), |
| date.getMonth(), |
| date.getDayOfMonth(), |
| (BaseCalendar.Date) date); |
| } |
| |
| // public for java.util.GregorianCalendar |
| public long getFixedDate(int year, int month, int dayOfMonth, BaseCalendar.Date cache) { |
| boolean isJan1 = month == JANUARY && dayOfMonth == 1; |
| |
| // Look up the one year cache |
| if (cache != null && cache.hit(year)) { |
| if (isJan1) { |
| return cache.getCachedJan1(); |
| } |
| return cache.getCachedJan1() + getDayOfYear(year, month, dayOfMonth) - 1; |
| } |
| |
| // Look up the pre-calculated fixed date table |
| int n = year - BASE_YEAR; |
| if (n >= 0 && n < FIXED_DATES.length) { |
| long jan1 = FIXED_DATES[n]; |
| if (cache != null) { |
| cache.setCache(year, jan1, isLeapYear(year) ? 366 : 365); |
| } |
| return isJan1 ? jan1 : jan1 + getDayOfYear(year, month, dayOfMonth) - 1; |
| } |
| |
| long prevyear = (long)year - 1; |
| long days = dayOfMonth; |
| |
| if (prevyear >= 0) { |
| days += (365 * prevyear) |
| + (prevyear / 4) |
| - (prevyear / 100) |
| + (prevyear / 400) |
| + ((367 * month - 362) / 12); |
| } else { |
| days += (365 * prevyear) |
| + CalendarUtils.floorDivide(prevyear, 4) |
| - CalendarUtils.floorDivide(prevyear, 100) |
| + CalendarUtils.floorDivide(prevyear, 400) |
| + CalendarUtils.floorDivide((367 * month - 362), 12); |
| } |
| |
| if (month > FEBRUARY) { |
| days -= isLeapYear(year) ? 1 : 2; |
| } |
| |
| // If it's January 1, update the cache. |
| if (cache != null && isJan1) { |
| cache.setCache(year, days, isLeapYear(year) ? 366 : 365); |
| } |
| |
| return days; |
| } |
| |
| /** |
| * Calculates calendar fields and store them in the specified |
| * <code>CalendarDate</code>. |
| */ |
| // should be 'protected' |
| public void getCalendarDateFromFixedDate(CalendarDate date, |
| long fixedDate) { |
| Date gdate = (Date) date; |
| int year; |
| long jan1; |
| boolean isLeap; |
| if (gdate.hit(fixedDate)) { |
| year = gdate.getCachedYear(); |
| jan1 = gdate.getCachedJan1(); |
| isLeap = isLeapYear(year); |
| } else { |
| // Looking up FIXED_DATES[] here didn't improve performance |
| // much. So we calculate year and jan1. getFixedDate() |
| // will look up FIXED_DATES[] actually. |
| year = getGregorianYearFromFixedDate(fixedDate); |
| jan1 = getFixedDate(year, JANUARY, 1, null); |
| isLeap = isLeapYear(year); |
| // Update the cache data |
| gdate.setCache (year, jan1, isLeap ? 366 : 365); |
| } |
| |
| int priorDays = (int)(fixedDate - jan1); |
| long mar1 = jan1 + 31 + 28; |
| if (isLeap) { |
| ++mar1; |
| } |
| if (fixedDate >= mar1) { |
| priorDays += isLeap ? 1 : 2; |
| } |
| int month = 12 * priorDays + 373; |
| if (month > 0) { |
| month /= 367; |
| } else { |
| month = CalendarUtils.floorDivide(month, 367); |
| } |
| long month1 = jan1 + ACCUMULATED_DAYS_IN_MONTH[month]; |
| if (isLeap && month >= MARCH) { |
| ++month1; |
| } |
| int dayOfMonth = (int)(fixedDate - month1) + 1; |
| int dayOfWeek = getDayOfWeekFromFixedDate(fixedDate); |
| assert dayOfWeek > 0 : "negative day of week " + dayOfWeek; |
| gdate.setNormalizedYear(year); |
| gdate.setMonth(month); |
| gdate.setDayOfMonth(dayOfMonth); |
| gdate.setDayOfWeek(dayOfWeek); |
| gdate.setLeapYear(isLeap); |
| gdate.setNormalized(true); |
| } |
| |
| /** |
| * Returns the day of week of the given Gregorian date. |
| */ |
| public int getDayOfWeek(CalendarDate date) { |
| long fixedDate = getFixedDate(date); |
| return getDayOfWeekFromFixedDate(fixedDate); |
| } |
| |
| public static final int getDayOfWeekFromFixedDate(long fixedDate) { |
| // The fixed day 1 (January 1, 1 Gregorian) is Monday. |
| if (fixedDate >= 0) { |
| return (int)(fixedDate % 7) + SUNDAY; |
| } |
| return (int)CalendarUtils.mod(fixedDate, 7) + SUNDAY; |
| } |
| |
| public int getYearFromFixedDate(long fixedDate) { |
| return getGregorianYearFromFixedDate(fixedDate); |
| } |
| |
| /** |
| * Returns the Gregorian year number of the given fixed date. |
| */ |
| final int getGregorianYearFromFixedDate(long fixedDate) { |
| long d0; |
| int d1, d2, d3, d4; |
| int n400, n100, n4, n1; |
| int year; |
| |
| if (fixedDate > 0) { |
| d0 = fixedDate - 1; |
| n400 = (int)(d0 / 146097); |
| d1 = (int)(d0 % 146097); |
| n100 = d1 / 36524; |
| d2 = d1 % 36524; |
| n4 = d2 / 1461; |
| d3 = d2 % 1461; |
| n1 = d3 / 365; |
| d4 = (d3 % 365) + 1; |
| } else { |
| d0 = fixedDate - 1; |
| n400 = (int)CalendarUtils.floorDivide(d0, 146097L); |
| d1 = (int)CalendarUtils.mod(d0, 146097L); |
| n100 = CalendarUtils.floorDivide(d1, 36524); |
| d2 = CalendarUtils.mod(d1, 36524); |
| n4 = CalendarUtils.floorDivide(d2, 1461); |
| d3 = CalendarUtils.mod(d2, 1461); |
| n1 = CalendarUtils.floorDivide(d3, 365); |
| d4 = CalendarUtils.mod(d3, 365) + 1; |
| } |
| year = 400 * n400 + 100 * n100 + 4 * n4 + n1; |
| if (!(n100 == 4 || n1 == 4)) { |
| ++year; |
| } |
| return year; |
| } |
| |
| /** |
| * @return true if the specified year is a Gregorian leap year, or |
| * false otherwise. |
| * @see BaseCalendar#isGregorianLeapYear |
| */ |
| protected boolean isLeapYear(CalendarDate date) { |
| return isLeapYear(((Date)date).getNormalizedYear()); |
| } |
| |
| boolean isLeapYear(int normalizedYear) { |
| return CalendarUtils.isGregorianLeapYear(normalizedYear); |
| } |
| } |
