Examples with CalendarSystem sun.util.calendar.CalendarSystem used on opensource projects

Example 6 with CalendarSystem

use of sun.util.calendar.CalendarSystem in project jdk8u_jdk by JetBrains.

the class GregorianCalendar method getActualMaximum.

/**
     * Returns the maximum value that this calendar field could have,
     * taking into consideration the given time value and the current
     * values of the
     * {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek},
     * {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek},
     * {@link #getGregorianChange() getGregorianChange} and
     * {@link Calendar#getTimeZone() getTimeZone} methods.
     * For example, if the date of this instance is February 1, 2004,
     * the actual maximum value of the <code>DAY_OF_MONTH</code> field
     * is 29 because 2004 is a leap year, and if the date of this
     * instance is February 1, 2005, it's 28.
     *
     * <p>This method calculates the maximum value of {@link
     * Calendar#WEEK_OF_YEAR WEEK_OF_YEAR} based on the {@link
     * Calendar#YEAR YEAR} (calendar year) value, not the <a
     * href="#week_year">week year</a>. Call {@link
     * #getWeeksInWeekYear()} to get the maximum value of {@code
     * WEEK_OF_YEAR} in the week year of this {@code GregorianCalendar}.
     *
     * @param field the calendar field
     * @return the maximum of the given field for the time value of
     * this <code>GregorianCalendar</code>
     * @see #getMinimum(int)
     * @see #getMaximum(int)
     * @see #getGreatestMinimum(int)
     * @see #getLeastMaximum(int)
     * @see #getActualMinimum(int)
     * @since 1.2
     */
@Override
public int getActualMaximum(int field) {
    final int fieldsForFixedMax = ERA_MASK | DAY_OF_WEEK_MASK | HOUR_MASK | AM_PM_MASK | HOUR_OF_DAY_MASK | MINUTE_MASK | SECOND_MASK | MILLISECOND_MASK | ZONE_OFFSET_MASK | DST_OFFSET_MASK;
    if ((fieldsForFixedMax & (1 << field)) != 0) {
        return getMaximum(field);
    }
    GregorianCalendar gc = getNormalizedCalendar();
    BaseCalendar.Date date = gc.cdate;
    BaseCalendar cal = gc.calsys;
    int normalizedYear = date.getNormalizedYear();
    int value = -1;
    switch(field) {
        case MONTH:
            {
                if (!gc.isCutoverYear(normalizedYear)) {
                    value = DECEMBER;
                    break;
                }
                // January 1 of the next year may or may not exist.
                long nextJan1;
                do {
                    nextJan1 = gcal.getFixedDate(++normalizedYear, BaseCalendar.JANUARY, 1, null);
                } while (nextJan1 < gregorianCutoverDate);
                BaseCalendar.Date d = (BaseCalendar.Date) date.clone();
                cal.getCalendarDateFromFixedDate(d, nextJan1 - 1);
                value = d.getMonth() - 1;
            }
            break;
        case DAY_OF_MONTH:
            {
                value = cal.getMonthLength(date);
                if (!gc.isCutoverYear(normalizedYear) || date.getDayOfMonth() == value) {
                    break;
                }
                // Handle cutover year.
                long fd = gc.getCurrentFixedDate();
                if (fd >= gregorianCutoverDate) {
                    break;
                }
                int monthLength = gc.actualMonthLength();
                long monthEnd = gc.getFixedDateMonth1(gc.cdate, fd) + monthLength - 1;
                // Convert the fixed date to its calendar date.
                BaseCalendar.Date d = gc.getCalendarDate(monthEnd);
                value = d.getDayOfMonth();
            }
            break;
        case DAY_OF_YEAR:
            {
                if (!gc.isCutoverYear(normalizedYear)) {
                    value = cal.getYearLength(date);
                    break;
                }
                // Handle cutover year.
                long jan1;
                if (gregorianCutoverYear == gregorianCutoverYearJulian) {
                    BaseCalendar cocal = gc.getCutoverCalendarSystem();
                    jan1 = cocal.getFixedDate(normalizedYear, 1, 1, null);
                } else if (normalizedYear == gregorianCutoverYearJulian) {
                    jan1 = cal.getFixedDate(normalizedYear, 1, 1, null);
                } else {
                    jan1 = gregorianCutoverDate;
                }
                // January 1 of the next year may or may not exist.
                long nextJan1 = gcal.getFixedDate(++normalizedYear, 1, 1, null);
                if (nextJan1 < gregorianCutoverDate) {
                    nextJan1 = gregorianCutoverDate;
                }
                assert jan1 <= cal.getFixedDate(date.getNormalizedYear(), date.getMonth(), date.getDayOfMonth(), date);
                assert nextJan1 >= cal.getFixedDate(date.getNormalizedYear(), date.getMonth(), date.getDayOfMonth(), date);
                value = (int) (nextJan1 - jan1);
            }
            break;
        case WEEK_OF_YEAR:
            {
                if (!gc.isCutoverYear(normalizedYear)) {
                    // Get the day of week of January 1 of the year
                    CalendarDate d = cal.newCalendarDate(TimeZone.NO_TIMEZONE);
                    d.setDate(date.getYear(), BaseCalendar.JANUARY, 1);
                    int dayOfWeek = cal.getDayOfWeek(d);
                    // Normalize the day of week with the firstDayOfWeek value
                    dayOfWeek -= getFirstDayOfWeek();
                    if (dayOfWeek < 0) {
                        dayOfWeek += 7;
                    }
                    value = 52;
                    int magic = dayOfWeek + getMinimalDaysInFirstWeek() - 1;
                    if ((magic == 6) || (date.isLeapYear() && (magic == 5 || magic == 12))) {
                        value++;
                    }
                    break;
                }
                if (gc == this) {
                    gc = (GregorianCalendar) gc.clone();
                }
                int maxDayOfYear = getActualMaximum(DAY_OF_YEAR);
                gc.set(DAY_OF_YEAR, maxDayOfYear);
                value = gc.get(WEEK_OF_YEAR);
                if (internalGet(YEAR) != gc.getWeekYear()) {
                    gc.set(DAY_OF_YEAR, maxDayOfYear - 7);
                    value = gc.get(WEEK_OF_YEAR);
                }
            }
            break;
        case WEEK_OF_MONTH:
            {
                if (!gc.isCutoverYear(normalizedYear)) {
                    CalendarDate d = cal.newCalendarDate(null);
                    d.setDate(date.getYear(), date.getMonth(), 1);
                    int dayOfWeek = cal.getDayOfWeek(d);
                    int monthLength = cal.getMonthLength(d);
                    dayOfWeek -= getFirstDayOfWeek();
                    if (dayOfWeek < 0) {
                        dayOfWeek += 7;
                    }
                    // # of days in the first week
                    int nDaysFirstWeek = 7 - dayOfWeek;
                    value = 3;
                    if (nDaysFirstWeek >= getMinimalDaysInFirstWeek()) {
                        value++;
                    }
                    monthLength -= nDaysFirstWeek + 7 * 3;
                    if (monthLength > 0) {
                        value++;
                        if (monthLength > 7) {
                            value++;
                        }
                    }
                    break;
                }
                // Cutover year handling
                if (gc == this) {
                    gc = (GregorianCalendar) gc.clone();
                }
                int y = gc.internalGet(YEAR);
                int m = gc.internalGet(MONTH);
                do {
                    value = gc.get(WEEK_OF_MONTH);
                    gc.add(WEEK_OF_MONTH, +1);
                } while (gc.get(YEAR) == y && gc.get(MONTH) == m);
            }
            break;
        case DAY_OF_WEEK_IN_MONTH:
            {
                // may be in the Gregorian cutover month
                int ndays, dow1;
                int dow = date.getDayOfWeek();
                if (!gc.isCutoverYear(normalizedYear)) {
                    BaseCalendar.Date d = (BaseCalendar.Date) date.clone();
                    ndays = cal.getMonthLength(d);
                    d.setDayOfMonth(1);
                    cal.normalize(d);
                    dow1 = d.getDayOfWeek();
                } else {
                    // Let a cloned GregorianCalendar take care of the cutover cases.
                    if (gc == this) {
                        gc = (GregorianCalendar) clone();
                    }
                    ndays = gc.actualMonthLength();
                    gc.set(DAY_OF_MONTH, gc.getActualMinimum(DAY_OF_MONTH));
                    dow1 = gc.get(DAY_OF_WEEK);
                }
                int x = dow - dow1;
                if (x < 0) {
                    x += 7;
                }
                ndays -= x;
                value = (ndays + 6) / 7;
            }
            break;
        case YEAR:
            /* The year computation is no different, in principle, from the
             * others, however, the range of possible maxima is large.  In
             * addition, the way we know we've exceeded the range is different.
             * For these reasons, we use the special case code below to handle
             * this field.
             *
             * The actual maxima for YEAR depend on the type of calendar:
             *
             *     Gregorian = May 17, 292275056 BCE - Aug 17, 292278994 CE
             *     Julian    = Dec  2, 292269055 BCE - Jan  3, 292272993 CE
             *     Hybrid    = Dec  2, 292269055 BCE - Aug 17, 292278994 CE
             *
             * We know we've exceeded the maximum when either the month, date,
             * time, or era changes in response to setting the year.  We don't
             * check for month, date, and time here because the year and era are
             * sufficient to detect an invalid year setting.  NOTE: If code is
             * added to check the month and date in the future for some reason,
             * Feb 29 must be allowed to shift to Mar 1 when setting the year.
             */
            {
                if (gc == this) {
                    gc = (GregorianCalendar) clone();
                }
                // Calculate the millisecond offset from the beginning
                // of the year of this calendar and adjust the max
                // year value if we are beyond the limit in the max
                // year.
                long current = gc.getYearOffsetInMillis();
                if (gc.internalGetEra() == CE) {
                    gc.setTimeInMillis(Long.MAX_VALUE);
                    value = gc.get(YEAR);
                    long maxEnd = gc.getYearOffsetInMillis();
                    if (current > maxEnd) {
                        value--;
                    }
                } else {
                    CalendarSystem mincal = gc.getTimeInMillis() >= gregorianCutover ? gcal : getJulianCalendarSystem();
                    CalendarDate d = mincal.getCalendarDate(Long.MIN_VALUE, getZone());
                    long maxEnd = (cal.getDayOfYear(d) - 1) * 24 + d.getHours();
                    maxEnd *= 60;
                    maxEnd += d.getMinutes();
                    maxEnd *= 60;
                    maxEnd += d.getSeconds();
                    maxEnd *= 1000;
                    maxEnd += d.getMillis();
                    value = d.getYear();
                    if (value <= 0) {
                        assert mincal == gcal;
                        value = 1 - value;
                    }
                    if (current < maxEnd) {
                        value--;
                    }
                }
            }
            break;
        default:
            throw new ArrayIndexOutOfBoundsException(field);
    }
    return value;
}