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third-party-mirror/openjdk/jdk25u/refs/heads/master/./src/java.base/share/classes/java/util/JapaneseImperialCalendar.java
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/*
* Copyright (c) 2005, 2025, 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
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package java.util;
import java.io.IOException;
import java.io.ObjectInputStream;
import sun.util.locale.provider.CalendarDataUtility;
import sun.util.calendar.BaseCalendar;
import sun.util.calendar.CalendarDate;
import sun.util.calendar.CalendarSystem;
import sun.util.calendar.CalendarUtils;
import sun.util.calendar.Era;
import sun.util.calendar.Gregorian;
import sun.util.calendar.LocalGregorianCalendar;
import sun.util.calendar.ZoneInfo;
/**
* {@code JapaneseImperialCalendar} implements a Japanese
* calendar system in which the imperial era-based year numbering is
* supported from the Meiji era. The following are the eras supported
* by this calendar system.
* <pre>{@code
* ERA value Era name Since (in Gregorian)
* ------------------------------------------------------
* 0 N/A N/A
* 1 Meiji 1868-01-01T00:00:00 local time
* 2 Taisho 1912-07-30T00:00:00 local time
* 3 Showa 1926-12-25T00:00:00 local time
* 4 Heisei 1989-01-08T00:00:00 local time
* 5 Reiwa 2019-05-01T00:00:00 local time
* ------------------------------------------------------
* }</pre>
*
* <p>{@code ERA} value 0 specifies the years before Meiji and
* the Gregorian year values are used. Unlike
* {@link GregorianCalendar}, the Julian to Gregorian transition is not
* supported because it doesn't make any sense to the Japanese
* calendar systems used before Meiji. To represent the years before
* Gregorian year 1, 0 and negative values are used. The Japanese
* Imperial rescripts and government decrees don't specify how to deal
* with time differences for applying the era transitions. This
* calendar implementation assumes local time for all transitions.
*
* <p>A new era can be specified using property
* jdk.calendar.japanese.supplemental.era. The new era is added to the
* predefined eras. The syntax of the property is as follows.
* <pre>
* {@code name=<name>,abbr=<abbr>,since=<time['u']>}
* </pre>
* where
* <dl>
* <dt>{@code <name>:}<dd>the full name of the new era (non-ASCII characters allowed,
* either in platform's native encoding or in Unicode escape notation, {@code \\uXXXX})
* <dt>{@code <abbr>:}<dd>the abbreviation of the new era (non-ASCII characters allowed,
* either in platform's native encoding or in Unicode escape notation, {@code \\uXXXX})
* <dt>{@code <time['u']>:}<dd>the start time of the new era represented by
* milliseconds from 1970-01-01T00:00:00 local time or UTC if {@code 'u'} is
* appended to the milliseconds value. (ASCII digits only)
* </dl>
*
* <p>If the given era is invalid, such as the since value before the
* beginning of the last predefined era, the given era will be
* ignored.
*
* <p>The following is an example of the property usage.
* <pre>
* java -Djdk.calendar.japanese.supplemental.era="name=NewEra,abbr=N,since=253374307200000"
* </pre>
* The property specifies an era change to NewEra at 9999-02-11T00:00:00 local time.
*
* @author Masayoshi Okutsu
* @since 1.6
*/
class JapaneseImperialCalendar extends Calendar {
/*
* Implementation Notes
*
* This implementation uses
* sun.util.calendar.LocalGregorianCalendar to perform most of the
* calendar calculations.
*/
/**
* The ERA constant designating the era before Meiji.
*/
public static final int BEFORE_MEIJI = 0;
/**
* The ERA constant designating the Meiji era.
*/
public static final int MEIJI = 1;
/**
* The ERA constant designating the Taisho era.
*/
public static final int TAISHO = 2;
/**
* The ERA constant designating the Showa era.
*/
public static final int SHOWA = 3;
/**
* The ERA constant designating the Heisei era.
*/
public static final int HEISEI = 4;
/**
* The ERA constant designating the Reiwa era.
*/
private static final int REIWA = 5;
private static final int EPOCH_OFFSET = 719163; // Fixed date of January 1, 1970 (Gregorian)
// Useful millisecond constants. Although ONE_DAY and ONE_WEEK can fit
// into ints, they must be longs in order to prevent arithmetic overflow
// when performing (bug 4173516).
private static final int ONE_SECOND = 1000;
private static final int ONE_MINUTE = 60*ONE_SECOND;
private static final int ONE_HOUR = 60*ONE_MINUTE;
private static final long ONE_DAY = 24*ONE_HOUR;
// Reference to the sun.util.calendar.LocalGregorianCalendar instance (singleton).
private static final LocalGregorianCalendar jcal
= (LocalGregorianCalendar) CalendarSystem.forName("japanese");
// Gregorian calendar instance. This is required because era
// transition dates are given in Gregorian dates.
private static final Gregorian gcal = CalendarSystem.getGregorianCalendar();
// The Era instance representing "before Meiji".
private static final Era BEFORE_MEIJI_ERA = new Era("BeforeMeiji", "BM", Long.MIN_VALUE, false);
// Imperial eras. The sun.util.calendar.LocalGregorianCalendar
// doesn't have an Era representing before Meiji, which is
// inconvenient for a Calendar. So, era[0] is a reference to
// BEFORE_MEIJI_ERA.
private static final Era[] eras;
// Fixed date of the first date of each era.
private static final long[] sinceFixedDates;
// The current era
private static final int currentEra;
/*
* <pre>
* Greatest Least
* Field name Minimum Minimum Maximum Maximum
* ---------- ------- ------- ------- -------
* ERA 0 0 1 1
* YEAR -292275055 1 ? ?
* MONTH 0 0 11 11
* WEEK_OF_YEAR 1 1 52* 53
* WEEK_OF_MONTH 0 0 4* 6
* DAY_OF_MONTH 1 1 28* 31
* DAY_OF_YEAR 1 1 365* 366
* DAY_OF_WEEK 1 1 7 7
* DAY_OF_WEEK_IN_MONTH -1 -1 4* 6
* AM_PM 0 0 1 1
* HOUR 0 0 11 11
* HOUR_OF_DAY 0 0 23 23
* MINUTE 0 0 59 59
* SECOND 0 0 59 59
* MILLISECOND 0 0 999 999
* ZONE_OFFSET -13:00 -13:00 14:00 14:00
* DST_OFFSET 0:00 0:00 0:20 2:00
* </pre>
* *: depends on eras
*/
static final int MIN_VALUES[] = {
0, // ERA
-292275055, // YEAR
JANUARY, // MONTH
1, // WEEK_OF_YEAR
0, // WEEK_OF_MONTH
1, // DAY_OF_MONTH
1, // DAY_OF_YEAR
SUNDAY, // DAY_OF_WEEK
1, // DAY_OF_WEEK_IN_MONTH
AM, // AM_PM
0, // HOUR
0, // HOUR_OF_DAY
0, // MINUTE
0, // SECOND
0, // MILLISECOND
-13*ONE_HOUR, // ZONE_OFFSET (UNIX compatibility)
0 // DST_OFFSET
};
static final int LEAST_MAX_VALUES[] = {
0, // ERA (initialized later)
0, // YEAR (initialized later)
JANUARY, // MONTH (Showa 64 ended in January.)
0, // WEEK_OF_YEAR (Showa 1 has only 6 days which could be 0 weeks.)
4, // WEEK_OF_MONTH
28, // DAY_OF_MONTH
0, // DAY_OF_YEAR (initialized later)
SATURDAY, // DAY_OF_WEEK
4, // DAY_OF_WEEK_IN
PM, // AM_PM
11, // HOUR
23, // HOUR_OF_DAY
59, // MINUTE
59, // SECOND
999, // MILLISECOND
14*ONE_HOUR, // ZONE_OFFSET
20*ONE_MINUTE // DST_OFFSET (historical least maximum)
};
static final int MAX_VALUES[] = {
0, // ERA
292278994, // YEAR
DECEMBER, // MONTH
53, // WEEK_OF_YEAR
6, // WEEK_OF_MONTH
31, // DAY_OF_MONTH
366, // DAY_OF_YEAR
SATURDAY, // DAY_OF_WEEK
6, // DAY_OF_WEEK_IN
PM, // AM_PM
11, // HOUR
23, // HOUR_OF_DAY
59, // MINUTE
59, // SECOND
999, // MILLISECOND
14*ONE_HOUR, // ZONE_OFFSET
2*ONE_HOUR // DST_OFFSET (double summer time)
};
// Proclaim serialization compatibility with JDK 1.6
@SuppressWarnings("FieldNameHidesFieldInSuperclass")
@java.io.Serial
private static final long serialVersionUID = -3364572813905467929L;
static {
Era[] es = jcal.getEras();
int length = es.length + 1;
eras = new Era[length];
sinceFixedDates = new long[length];
// eras[BEFORE_MEIJI] and sinceFixedDate[BEFORE_MEIJI] are the
// same as Gregorian.
int index = BEFORE_MEIJI;
int current = index;
sinceFixedDates[index] = gcal.getFixedDate(BEFORE_MEIJI_ERA.getSinceDate());
eras[index++] = BEFORE_MEIJI_ERA;
for (Era e : es) {
if(e.getSince(TimeZone.NO_TIMEZONE) < System.currentTimeMillis()) {
current = index;
}
CalendarDate d = e.getSinceDate();
sinceFixedDates[index] = gcal.getFixedDate(d);
eras[index++] = e;
}
currentEra = current;
LEAST_MAX_VALUES[ERA] = MAX_VALUES[ERA] = eras.length - 1;
// Calculate the least maximum year and least day of Year
// values. The following code assumes that there's at most one
// era transition in a Gregorian year.
int year = Integer.MAX_VALUE;
int dayOfYear = Integer.MAX_VALUE;
CalendarDate date = gcal.newCalendarDate(TimeZone.NO_TIMEZONE);
for (int i = 1; i < eras.length; i++) {
long fd = sinceFixedDates[i];
CalendarDate transitionDate = eras[i].getSinceDate();
date.setDate(transitionDate.getYear(), BaseCalendar.JANUARY, 1);
long fdd = gcal.getFixedDate(date);
if (fd != fdd) {
dayOfYear = Math.min((int)(fd - fdd) + 1, dayOfYear);
}
date.setDate(transitionDate.getYear(), BaseCalendar.DECEMBER, 31);
fdd = gcal.getFixedDate(date);
if (fd != fdd) {
dayOfYear = Math.min((int)(fdd - fd) + 1, dayOfYear);
}
LocalGregorianCalendar.Date lgd = getCalendarDate(fd - 1);
int y = lgd.getYear();
// Unless the first year starts from January 1, the actual
// max value could be one year short. For example, if it's
// Showa 63 January 8, 63 is the actual max value since
// Showa 64 January 8 doesn't exist.
if (!(lgd.getMonth() == BaseCalendar.JANUARY && lgd.getDayOfMonth() == 1)) {
y--;
}
year = Math.min(y, year);
}
LEAST_MAX_VALUES[YEAR] = year; // Max year could be smaller than this value.
LEAST_MAX_VALUES[DAY_OF_YEAR] = dayOfYear;
}
/**
* jdate always has a sun.util.calendar.LocalGregorianCalendar.Date instance to
* avoid overhead of creating it for each calculation.
*/
private transient LocalGregorianCalendar.Date jdate;
/**
* Temporary int[2] to get time zone offsets. zoneOffsets[0] gets
* the GMT offset value and zoneOffsets[1] gets the daylight saving
* value.
*/
private transient int[] zoneOffsets;
/**
* Temporary storage for saving original fields[] values in
* non-lenient mode.
*/
private transient int[] originalFields;
/**
* Constructs a {@code JapaneseImperialCalendar} based on the current time
* in the given time zone with the given locale.
*
* @param zone the given time zone.
* @param aLocale the given locale.
*/
JapaneseImperialCalendar(TimeZone zone, Locale aLocale) {
super(zone, aLocale);
jdate = jcal.newCalendarDate(zone);
setTimeInMillis(System.currentTimeMillis());
}
/**
* Constructs an "empty" {@code JapaneseImperialCalendar}.
*
* @param zone the given time zone
* @param aLocale the given locale
* @param flag the flag requesting an empty instance
*/
JapaneseImperialCalendar(TimeZone zone, Locale aLocale, boolean flag) {
super(zone, aLocale);
jdate = jcal.newCalendarDate(zone);
}
/**
* Returns {@code "japanese"} as the calendar type of this {@code
* JapaneseImperialCalendar}.
*
* @return {@code "japanese"}
*/
@Override
public String getCalendarType() {
return "japanese";
}
/**
* Compares this {@code JapaneseImperialCalendar} to the specified
* {@code Object}. The result is {@code true} if and
* only if the argument is a {@code JapaneseImperialCalendar} object
* that represents the same time value (millisecond offset from
* the <a href="Calendar.html#Epoch">Epoch</a>) under the same
* {@code Calendar} parameters.
*
* @param obj the object to compare with.
* @return {@code true} if this object is equal to {@code obj};
* {@code false} otherwise.
* @see Calendar#compareTo(Calendar)
*/
@Override
public boolean equals(Object obj) {
return obj instanceof JapaneseImperialCalendar &&
super.equals(obj);
}
/**
* Generates the hash code for this
* {@code JapaneseImperialCalendar} object.
*/
@Override
public int hashCode() {
return super.hashCode() ^ jdate.hashCode();
}
/**
* Adds the specified (signed) amount of time to the given calendar field,
* based on the calendar's rules.
*
* <p><em>Add rule 1</em>. The value of {@code field}
* after the call minus the value of {@code field} before the
* call is {@code amount}, modulo any overflow that has occurred in
* {@code field}. Overflow occurs when a field value exceeds its
* range and, as a result, the next larger field is incremented or
* decremented and the field value is adjusted back into its range.</p>
*
* <p><em>Add rule 2</em>. If a smaller field is expected to be
* invariant, but it is impossible for it to be equal to its
* prior value because of changes in its minimum or maximum after
* {@code field} is changed, then its value is adjusted to be as close
* as possible to its expected value. A smaller field represents a
* smaller unit of time. {@code HOUR} is a smaller field than
* {@code DAY_OF_MONTH}. No adjustment is made to smaller fields
* that are not expected to be invariant. The calendar system
* determines what fields are expected to be invariant.</p>
*
* @param field the calendar field.
* @param amount the amount of date or time to be added to the field.
* @throws IllegalArgumentException if {@code field} is
* {@code ZONE_OFFSET}, {@code DST_OFFSET}, or unknown,
* or if any calendar fields have out-of-range values in
* non-lenient mode.
*/
@Override
public void add(int field, int amount) {
// If amount == 0, do nothing even the given field is out of
// range. This is tested by JCK.
if (amount == 0) {
return; // Do nothing!
}
if (field < 0 || field >= ZONE_OFFSET) {
throw new IllegalArgumentException();
}
// Sync the time and calendar fields.
complete();
if (field == YEAR) {
LocalGregorianCalendar.Date d = (LocalGregorianCalendar.Date) jdate.clone();
d.addYear(amount);
pinDayOfMonth(d);
set(ERA, getEraIndex(d));
set(YEAR, d.getYear());
set(MONTH, d.getMonth() - 1);
set(DAY_OF_MONTH, d.getDayOfMonth());
} else if (field == MONTH) {
LocalGregorianCalendar.Date d = (LocalGregorianCalendar.Date) jdate.clone();
d.addMonth(amount);
pinDayOfMonth(d);
set(ERA, getEraIndex(d));
set(YEAR, d.getYear());
set(MONTH, d.getMonth() - 1);
set(DAY_OF_MONTH, d.getDayOfMonth());
} else if (field == ERA) {
int era = internalGet(ERA) + amount;
if (era < 0) {
era = 0;
} else if (era > eras.length - 1) {
era = eras.length - 1;
}
set(ERA, era);
} else {
long delta = amount;
long timeOfDay = 0;
switch (field) {
// Handle the time fields here. Convert the given
// amount to milliseconds and call setTimeInMillis.
case HOUR:
case HOUR_OF_DAY:
delta *= 60 * 60 * 1000; // hours to milliseconds
break;
case MINUTE:
delta *= 60 * 1000; // minutes to milliseconds
break;
case SECOND:
delta *= 1000; // seconds to milliseconds
break;
case MILLISECOND:
break;
// Handle week, day and AM_PM fields which involves
// time zone offset change adjustment. Convert the
// given amount to the number of days.
case WEEK_OF_YEAR:
case WEEK_OF_MONTH:
case DAY_OF_WEEK_IN_MONTH:
delta *= 7;
break;
case DAY_OF_MONTH: // synonym of DATE
case DAY_OF_YEAR:
case DAY_OF_WEEK:
break;
case AM_PM:
// Convert the amount to the number of days (delta)
// and +12 or -12 hours (timeOfDay).
delta = amount / 2;
timeOfDay = 12 * (amount % 2);
break;
}
// The time fields don't require time zone offset change
// adjustment.
if (field >= HOUR) {
setTimeInMillis(time + delta);
return;
}
// The rest of the fields (week, day or AM_PM fields)
// require time zone offset (both GMT and DST) change
// adjustment.
// Translate the current time to the fixed date and time
// of the day.
long fd = cachedFixedDate;
timeOfDay += internalGet(HOUR_OF_DAY);
timeOfDay *= 60;
timeOfDay += internalGet(MINUTE);
timeOfDay *= 60;
timeOfDay += internalGet(SECOND);
timeOfDay *= 1000;
timeOfDay += internalGet(MILLISECOND);
if (timeOfDay >= ONE_DAY) {
fd++;
timeOfDay -= ONE_DAY;
} else if (timeOfDay < 0) {
fd--;
timeOfDay += ONE_DAY;
}
fd += delta; // fd is the expected fixed date after the calculation
int zoneOffset = internalGet(ZONE_OFFSET) + internalGet(DST_OFFSET);
setTimeInMillis((fd - EPOCH_OFFSET) * ONE_DAY + timeOfDay - zoneOffset);
zoneOffset -= internalGet(ZONE_OFFSET) + internalGet(DST_OFFSET);
// If the time zone offset has changed, then adjust the difference.
if (zoneOffset != 0) {
setTimeInMillis(time + zoneOffset);
long fd2 = cachedFixedDate;
// If the adjustment has changed the date, then take
// the previous one.
if (fd2 != fd) {
setTimeInMillis(time - zoneOffset);
}
}
}
}
@Override
public void roll(int field, boolean up) {
roll(field, up ? +1 : -1);
}
/**
* Adds a signed amount to the specified calendar field without changing larger fields.
* A negative roll amount means to subtract from field without changing
* larger fields. If the specified amount is 0, this method performs nothing.
*
* <p>This method calls {@link #complete()} before adding the
* amount so that all the calendar fields are normalized. If there
* is any calendar field having an out-of-range value in non-lenient mode, then an
* {@code IllegalArgumentException} is thrown.
*
* @param field the calendar field.
* @param amount the signed amount to add to {@code field}.
* @throws IllegalArgumentException if {@code field} is
* {@code ZONE_OFFSET}, {@code DST_OFFSET}, or unknown,
* or if any calendar fields have out-of-range values in
* non-lenient mode.
* @see #roll(int,boolean)
* @see #add(int,int)
* @see #set(int,int)
*/
@Override
public void roll(int field, int amount) {
// If amount == 0, do nothing even the given field is out of
// range. This is tested by JCK.
if (amount == 0) {
return;
}
if (field < 0 || field >= ZONE_OFFSET) {
throw new IllegalArgumentException();
}
// Sync the time and calendar fields.
complete();
int min = getMinimum(field);
int max = getMaximum(field);
switch (field) {
case ERA:
case AM_PM:
case MINUTE:
case SECOND:
case MILLISECOND:
// These fields are handled simply, since they have fixed
// minima and maxima. Other fields are complicated, since
// the range within they must roll varies depending on the
// date, a time zone and the era transitions.
break;
case HOUR:
case HOUR_OF_DAY:
{
int unit = max + 1; // 12 or 24 hours
int h = internalGet(field);
int nh = (h + amount) % unit;
if (nh < 0) {
nh += unit;
}
time += ONE_HOUR * (nh - h);
// The day might have changed, which could happen if
// the daylight saving time transition brings it to
// the next day, although it's very unlikely. But we
// have to make sure not to change the larger fields.
CalendarDate d = jcal.getCalendarDate(time, getZone());
if (internalGet(DAY_OF_MONTH) != d.getDayOfMonth()) {
d.setEra(jdate.getEra());
d.setDate(internalGet(YEAR),
internalGet(MONTH) + 1,
internalGet(DAY_OF_MONTH));
if (field == HOUR) {
assert (internalGet(AM_PM) == PM);
d.addHours(+12); // restore PM
}
time = jcal.getTime(d);
}
int hourOfDay = d.getHours();
internalSet(field, hourOfDay % unit);
if (field == HOUR) {
internalSet(HOUR_OF_DAY, hourOfDay);
} else {
internalSet(AM_PM, hourOfDay / 12);
internalSet(HOUR, hourOfDay % 12);
}
// Time zone offset and/or daylight saving might have changed.
int zoneOffset = d.getZoneOffset();
int saving = d.getDaylightSaving();
internalSet(ZONE_OFFSET, zoneOffset - saving);
internalSet(DST_OFFSET, saving);
return;
}
case YEAR:
min = getActualMinimum(field);
max = getActualMaximum(field);
break;
case MONTH:
// Rolling the month involves both pinning the final value to [0, 11]
// and adjusting the DAY_OF_MONTH if necessary. We only adjust the
// DAY_OF_MONTH if, after updating the MONTH field, it is illegal.
// E.g., <jan31>.roll(MONTH, 1) -> <feb28> or <feb29>.
{
if (!isTransitionYear(jdate.getNormalizedYear())) {
int year = jdate.getYear();
if (year == getMaximum(YEAR)) {
CalendarDate jd = jcal.getCalendarDate(time, getZone());
CalendarDate d = jcal.getCalendarDate(Long.MAX_VALUE, getZone());
max = d.getMonth() - 1;
int n = getRolledValue(internalGet(field), amount, min, max);
if (n == max) {
// To avoid overflow, use an equivalent year.
jd.addYear(-400);
jd.setMonth(n + 1);
if (jd.getDayOfMonth() > d.getDayOfMonth()) {
jd.setDayOfMonth(d.getDayOfMonth());
jcal.normalize(jd);
}
if (jd.getDayOfMonth() == d.getDayOfMonth()
&& jd.getTimeOfDay() > d.getTimeOfDay()) {
jd.setMonth(n + 1);
jd.setDayOfMonth(d.getDayOfMonth() - 1);
jcal.normalize(jd);
// Month may have changed by the normalization.
n = jd.getMonth() - 1;
}
set(DAY_OF_MONTH, jd.getDayOfMonth());
}
set(MONTH, n);
} else if (year == getMinimum(YEAR)) {
CalendarDate jd = jcal.getCalendarDate(time, getZone());
CalendarDate d = jcal.getCalendarDate(Long.MIN_VALUE, getZone());
min = d.getMonth() - 1;
int n = getRolledValue(internalGet(field), amount, min, max);
if (n == min) {
// To avoid underflow, use an equivalent year.
jd.addYear(+400);
jd.setMonth(n + 1);
if (jd.getDayOfMonth() < d.getDayOfMonth()) {
jd.setDayOfMonth(d.getDayOfMonth());
jcal.normalize(jd);
}
if (jd.getDayOfMonth() == d.getDayOfMonth()
&& jd.getTimeOfDay() < d.getTimeOfDay()) {
jd.setMonth(n + 1);
jd.setDayOfMonth(d.getDayOfMonth() + 1);
jcal.normalize(jd);
// Month may have changed by the normalization.
n = jd.getMonth() - 1;
}
set(DAY_OF_MONTH, jd.getDayOfMonth());
}
set(MONTH, n);
} else {
int mon = (internalGet(MONTH) + amount) % 12;
if (mon < 0) {
mon += 12;
}
set(MONTH, mon);
// Keep the day of month in the range. We
// don't want to spill over into the next
// month; e.g., we don't want jan31 + 1 mo ->
// feb31 -> mar3.
int monthLen = monthLength(mon);
if (internalGet(DAY_OF_MONTH) > monthLen) {
set(DAY_OF_MONTH, monthLen);
}
}
} else {
int eraIndex = getEraIndex(jdate);
CalendarDate transition = null;
if (jdate.getYear() == 1) {
transition = eras[eraIndex].getSinceDate();
min = transition.getMonth() - 1;
} else {
if (eraIndex < eras.length - 1) {
transition = eras[eraIndex + 1].getSinceDate();
if (transition.getYear() == jdate.getNormalizedYear()) {
max = transition.getMonth() - 1;
if (transition.getDayOfMonth() == 1) {
max--;
}
}
}
}
if (min == max) {
// The year has only one month. No need to
// process further. (Showa Gan-nen (year 1)
// and the last year have only one month.)
return;
}
int n = getRolledValue(internalGet(field), amount, min, max);
set(MONTH, n);
if (n == min) {
if (!(transition.getMonth() == BaseCalendar.JANUARY
&& transition.getDayOfMonth() == 1)) {
if (jdate.getDayOfMonth() < transition.getDayOfMonth()) {
set(DAY_OF_MONTH, transition.getDayOfMonth());
}
}
} else if (n == max && (transition.getMonth() - 1 == n)) {
int dom = transition.getDayOfMonth();
if (jdate.getDayOfMonth() >= dom) {
set(DAY_OF_MONTH, dom - 1);
}
}
}
return;
}
case WEEK_OF_YEAR:
{
int y = jdate.getNormalizedYear();
max = getActualMaximum(WEEK_OF_YEAR);
set(DAY_OF_WEEK, internalGet(DAY_OF_WEEK)); // update stamp[field]
int woy = internalGet(WEEK_OF_YEAR);
int value = woy + amount;
if (!isTransitionYear(jdate.getNormalizedYear())) {
int year = jdate.getYear();
if (year == getMaximum(YEAR)) {
max = getActualMaximum(WEEK_OF_YEAR);
} else if (year == getMinimum(YEAR)) {
min = getActualMinimum(WEEK_OF_YEAR);
max = getActualMaximum(WEEK_OF_YEAR);
if (value > min && value < max) {
set(WEEK_OF_YEAR, value);
return;
}
}
// If the new value is in between min and max
// (exclusive), then we can use the value.
if (value > min && value < max) {
set(WEEK_OF_YEAR, value);
return;
}
long fd = cachedFixedDate;
// Make sure that the min week has the current DAY_OF_WEEK
long day1 = fd - (7 * (woy - min));
if (year != getMinimum(YEAR)) {
if (gcal.getYearFromFixedDate(day1) != y) {
min++;
}
} else {
CalendarDate d = jcal.getCalendarDate(Long.MIN_VALUE, getZone());
if (day1 < jcal.getFixedDate(d)) {
min++;
}
}
// Make sure the same thing for the max week
fd += 7 * (max - internalGet(WEEK_OF_YEAR));
if (gcal.getYearFromFixedDate(fd) != y) {
max--;
}
break;
}
// Handle transition here.
long fd = cachedFixedDate;
long day1 = fd - (7 * (woy - min));
// Make sure that the min week has the current DAY_OF_WEEK
LocalGregorianCalendar.Date d = getCalendarDate(day1);
if (!(d.getEra() == jdate.getEra() && d.getYear() == jdate.getYear())) {
min++;
}
// Make sure the same thing for the max week
fd += 7 * (max - woy);
jcal.getCalendarDateFromFixedDate(d, fd);
if (!(d.getEra() == jdate.getEra() && d.getYear() == jdate.getYear())) {
max--;
}
// value: the new WEEK_OF_YEAR which must be converted
// to month and day of month.
value = getRolledValue(woy, amount, min, max) - 1;
d = getCalendarDate(day1 + value * 7);
set(MONTH, d.getMonth() - 1);
set(DAY_OF_MONTH, d.getDayOfMonth());
return;
}
case WEEK_OF_MONTH:
{
boolean isTransitionYear = isTransitionYear(jdate.getNormalizedYear());
// dow: relative day of week from the first day of week
int dow = internalGet(DAY_OF_WEEK) - getFirstDayOfWeek();
if (dow < 0) {
dow += 7;
}
long fd = cachedFixedDate;
long month1; // fixed date of the first day (usually 1) of the month
int monthLength; // actual month length
if (isTransitionYear) {
month1 = getFixedDateMonth1(jdate, fd);
monthLength = actualMonthLength();
} else {
month1 = fd - internalGet(DAY_OF_MONTH) + 1;
monthLength = jcal.getMonthLength(jdate);
}
// the first day of week of the month.
long monthDay1st = LocalGregorianCalendar.getDayOfWeekDateOnOrBefore(month1 + 6,
getFirstDayOfWeek());
// if the week has enough days to form a week, the
// week starts from the previous month.
if ((int)(monthDay1st - month1) >= getMinimalDaysInFirstWeek()) {
monthDay1st -= 7;
}
max = getActualMaximum(field);
// value: the new WEEK_OF_MONTH value
int value = getRolledValue(internalGet(field), amount, 1, max) - 1;
// nfd: fixed date of the rolled date
long nfd = monthDay1st + value * 7 + dow;
// Unlike WEEK_OF_YEAR, we need to change day of week if the
// nfd is out of the month.
if (nfd < month1) {
nfd = month1;
} else if (nfd >= (month1 + monthLength)) {
nfd = month1 + monthLength - 1;
}
set(DAY_OF_MONTH, getCalendarDate(nfd).getDayOfMonth());
return;
}
case DAY_OF_MONTH:
{
if (!isTransitionYear(jdate.getNormalizedYear())) {
max = jcal.getMonthLength(jdate);
break;
}
// TODO: Need to change the spec to be usable DAY_OF_MONTH rolling...
// Transition handling. We can't change year and era
// values here due to the Calendar roll spec!
long month1 = getFixedDateMonth1(jdate, cachedFixedDate);
// It may not be a regular month. Convert the date and range to
// the relative values, perform the roll, and
// convert the result back to the rolled date.
int value = getRolledValue((int)(cachedFixedDate - month1), amount,
0, actualMonthLength() - 1);
LocalGregorianCalendar.Date d = getCalendarDate(month1 + value);
assert getEraIndex(d) == internalGetEra()
&& d.getYear() == internalGet(YEAR) && d.getMonth()-1 == internalGet(MONTH);
set(DAY_OF_MONTH, d.getDayOfMonth());
return;
}
case DAY_OF_YEAR:
{
max = getActualMaximum(field);
if (!isTransitionYear(jdate.getNormalizedYear())) {
break;
}
// Handle transition. We can't change year and era values
// here due to the Calendar roll spec.
int value = getRolledValue(internalGet(DAY_OF_YEAR), amount, min, max);
long jan0 = cachedFixedDate - internalGet(DAY_OF_YEAR);
LocalGregorianCalendar.Date d = getCalendarDate(jan0 + value);
assert getEraIndex(d) == internalGetEra() && d.getYear() == internalGet(YEAR);
set(MONTH, d.getMonth() - 1);
set(DAY_OF_MONTH, d.getDayOfMonth());
return;
}
case DAY_OF_WEEK:
{
int normalizedYear = jdate.getNormalizedYear();
if (!isTransitionYear(normalizedYear) && !isTransitionYear(normalizedYear - 1)) {
// If the week of year is in the same year, we can
// just change DAY_OF_WEEK.
int weekOfYear = internalGet(WEEK_OF_YEAR);
if (weekOfYear > 1 && weekOfYear < 52) {
set(WEEK_OF_YEAR, internalGet(WEEK_OF_YEAR));
max = SATURDAY;
break;
}
}
// We need to handle it in a different way around year
// boundaries and in the transition year. Note that
// changing era and year values violates the roll
// rule: not changing larger calendar fields...
amount %= 7;
if (amount == 0) {
return;
}
long fd = cachedFixedDate;
long dowFirst = LocalGregorianCalendar.getDayOfWeekDateOnOrBefore(fd, getFirstDayOfWeek());
fd += amount;
if (fd < dowFirst) {
fd += 7;
} else if (fd >= dowFirst + 7) {
fd -= 7;
}
LocalGregorianCalendar.Date d = getCalendarDate(fd);
set(ERA, getEraIndex(d));
set(d.getYear(), d.getMonth() - 1, d.getDayOfMonth());
return;
}
case DAY_OF_WEEK_IN_MONTH:
{
min = 1; // after having normalized, min should be 1.
if (!isTransitionYear(jdate.getNormalizedYear())) {
int dom = internalGet(DAY_OF_MONTH);
int monthLength = jcal.getMonthLength(jdate);
int lastDays = monthLength % 7;
max = monthLength / 7;
int x = (dom - 1) % 7;
if (x < lastDays) {
max++;
}
set(DAY_OF_WEEK, internalGet(DAY_OF_WEEK));
break;
}
// Transition year handling.
long fd = cachedFixedDate;
long month1 = getFixedDateMonth1(jdate, fd);
int monthLength = actualMonthLength();
int lastDays = monthLength % 7;
max = monthLength / 7;
int x = (int)(fd - month1) % 7;
if (x < lastDays) {
max++;
}
int value = getRolledValue(internalGet(field), amount, min, max) - 1;
fd = month1 + value * 7 + x;
LocalGregorianCalendar.Date d = getCalendarDate(fd);
set(DAY_OF_MONTH, d.getDayOfMonth());
return;
}
}
set(field, getRolledValue(internalGet(field), amount, min, max));
}
@Override
public String getDisplayName(int field, int style, Locale locale) {
if (!checkDisplayNameParams(field, style, SHORT, NARROW_FORMAT, locale,
ERA_MASK|YEAR_MASK|MONTH_MASK|DAY_OF_WEEK_MASK|AM_PM_MASK)) {
return null;
}
int fieldValue = get(field);
// "GanNen" is supported only in the LONG style.
if (field == YEAR
&& (getBaseStyle(style) != LONG || fieldValue != 1 || get(ERA) == 0)) {
return null;
}
String name = CalendarDataUtility.retrieveFieldValueName(getCalendarType(), field,
fieldValue, style, locale);
// If the ERA value is null or empty, then
// try to get its name or abbreviation from the Era instance.
if ((name == null || name.isEmpty()) &&
field == ERA &&
fieldValue < eras.length) {
Era era = eras[fieldValue];
name = (style == SHORT) ? era.getAbbreviation() : era.getName();
}
return name;
}
@Override
public Map<String,Integer> getDisplayNames(int field, int style, Locale locale) {
if (!checkDisplayNameParams(field, style, ALL_STYLES, NARROW_FORMAT, locale,
ERA_MASK|YEAR_MASK|MONTH_MASK|DAY_OF_WEEK_MASK|AM_PM_MASK)) {
return null;
}
Map<String, Integer> names;
names = CalendarDataUtility.retrieveFieldValueNames(getCalendarType(), field, style, locale);
// If strings[] has fewer than eras[], get more names from eras[].
if (names != null) {
if (field == ERA) {
int size = names.size();
if (style == ALL_STYLES) {
Set<Integer> values = new HashSet<>();
// count unique era values
for (String key : names.keySet()) {
values.add(names.get(key));
}
size = values.size();
}
if (size < eras.length) {
int baseStyle = getBaseStyle(style);
for (int i = 0; i < eras.length; i++) {
if (!names.values().contains(i)) {
Era era = eras[i];
if (baseStyle == ALL_STYLES || baseStyle == SHORT
|| baseStyle == NARROW_FORMAT) {
names.put(era.getAbbreviation(), i);
}
if (baseStyle == ALL_STYLES || baseStyle == LONG) {
names.put(era.getName(), i);
}
}
}
}
}
}
return names;
}
/**
* Returns the minimum value for the given calendar field of this
* {@code Calendar} instance. The minimum value is
* defined as the smallest value returned by the
* {@link Calendar#get(int) get} method for any possible time value,
* taking into consideration the current values of the
* {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek},
* {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek},
* and {@link Calendar#getTimeZone() getTimeZone} methods.
*
* @param field the calendar field.
* @return the minimum value for the given calendar field.
* @see #getMaximum(int)
* @see #getGreatestMinimum(int)
* @see #getLeastMaximum(int)
* @see #getActualMinimum(int)
* @see #getActualMaximum(int)
*/
public int getMinimum(int field) {
return MIN_VALUES[field];
}
/**
* Returns the maximum value for the given calendar field of this
* {@code GregorianCalendar} instance. The maximum value is
* defined as the largest value returned by the
* {@link Calendar#get(int) get} method for any possible time value,
* taking into consideration the current values of the
* {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek},
* {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek},
* and {@link Calendar#getTimeZone() getTimeZone} methods.
*
* @param field the calendar field.
* @return the maximum value for the given calendar field.
* @see #getMinimum(int)
* @see #getGreatestMinimum(int)
* @see #getLeastMaximum(int)
* @see #getActualMinimum(int)
* @see #getActualMaximum(int)
*/
public int getMaximum(int field) {
return switch (field) {
case YEAR -> {
// The value should depend on the time zone of this calendar.
LocalGregorianCalendar.Date d = jcal.getCalendarDate(Long.MAX_VALUE, getZone());
yield Math.max(LEAST_MAX_VALUES[YEAR], d.getYear());
}
default -> MAX_VALUES[field];
};
}
/**
* Returns the highest minimum value for the given calendar field
* of this {@code GregorianCalendar} instance. The highest
* minimum value is defined as the largest value returned by
* {@link #getActualMinimum(int)} for any possible time value,
* taking into consideration the current values of the
* {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek},
* {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek},
* and {@link Calendar#getTimeZone() getTimeZone} methods.
*
* @param field the calendar field.
* @return the highest minimum value for the given calendar field.
* @see #getMinimum(int)
* @see #getMaximum(int)
* @see #getLeastMaximum(int)
* @see #getActualMinimum(int)
* @see #getActualMaximum(int)
*/
public int getGreatestMinimum(int field) {
return field == YEAR ? 1 : MIN_VALUES[field];
}
/**
* Returns the lowest maximum value for the given calendar field
* of this {@code GregorianCalendar} instance. The lowest
* maximum value is defined as the smallest value returned by
* {@link #getActualMaximum(int)} for any possible time value,
* taking into consideration the current values of the
* {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek},
* {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek},
* and {@link Calendar#getTimeZone() getTimeZone} methods.
*
* @param field the calendar field
* @return the lowest maximum value for the given calendar field.
* @see #getMinimum(int)
* @see #getMaximum(int)
* @see #getGreatestMinimum(int)
* @see #getActualMinimum(int)
* @see #getActualMaximum(int)
*/
public int getLeastMaximum(int field) {
return switch (field) {
case YEAR -> Math.min(LEAST_MAX_VALUES[YEAR], getMaximum(YEAR));
default -> LEAST_MAX_VALUES[field];
};
}
/**
* Returns the minimum 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},
* and {@link Calendar#getTimeZone() getTimeZone} methods.
*
* @param field the calendar field
* @return the minimum of the given field for the time value of
* this {@code JapaneseImperialCalendar}
* @see #getMinimum(int)
* @see #getMaximum(int)
* @see #getGreatestMinimum(int)
* @see #getLeastMaximum(int)
* @see #getActualMaximum(int)
*/
public int getActualMinimum(int field) {
if (!isFieldSet(YEAR_MASK|MONTH_MASK|WEEK_OF_YEAR_MASK, field)) {
return getMinimum(field);
}
int value = 0;
JapaneseImperialCalendar jc = getNormalizedCalendar();
// Get a local date which includes time of day and time zone,
// which are missing in jc.jdate.
LocalGregorianCalendar.Date jd = jcal.getCalendarDate(jc.getTimeInMillis(),
getZone());
int eraIndex = getEraIndex(jd);
switch (field) {
case YEAR -> {
if (eraIndex > BEFORE_MEIJI) {
value = 1;
long since = eras[eraIndex].getSince(getZone());
CalendarDate d = jcal.getCalendarDate(since, getZone());
// Use the same year in jd to take care of leap
// years. i.e., both jd and d must agree on leap
// or common years.
jd.setYear(d.getYear());
jcal.normalize(jd);
assert jd.isLeapYear() == d.isLeapYear();
if (getYearOffsetInMillis(jd) < getYearOffsetInMillis(d)) {
value++;
}
} else {
value = getMinimum(field);
CalendarDate d = jcal.getCalendarDate(Long.MIN_VALUE, getZone());
// Use an equivalent year of d.getYear() if
// possible. Otherwise, ignore the leap year and
// common year difference.
int y = d.getYear();
if (y > 400) {
y -= 400;
}
jd.setYear(y);
jcal.normalize(jd);
if (getYearOffsetInMillis(jd) < getYearOffsetInMillis(d)) {
value++;
}
}
}
case MONTH -> {
// In Before Meiji and Meiji, January is the first month.
if (eraIndex > MEIJI && jd.getYear() == 1) {
long since = eras[eraIndex].getSince(getZone());
CalendarDate d = jcal.getCalendarDate(since, getZone());
value = d.getMonth() - 1;
if (jd.getDayOfMonth() < d.getDayOfMonth()) {
value++;
}
}
}
case WEEK_OF_YEAR -> {
value = 1;
CalendarDate d = jcal.getCalendarDate(Long.MIN_VALUE, getZone());
// shift 400 years to avoid underflow
d.addYear(+400);
jcal.normalize(d);
jd.setEra(d.getEra());
jd.setYear(d.getYear());
jcal.normalize(jd);
long jan1 = jcal.getFixedDate(d);
long fd = jcal.getFixedDate(jd);
int woy = getWeekNumber(jan1, fd);
long day1 = fd - (7 * (woy - 1));
if ((day1 < jan1) ||
(day1 == jan1 &&
jd.getTimeOfDay() < d.getTimeOfDay())) {
value++;
}
}
}
return value;
}
/**
* 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},
* and
* {@link Calendar#getTimeZone() getTimeZone} methods.
* For example, if the date of this instance is Heisei 16February 1,
* the actual maximum value of the {@code DAY_OF_MONTH} field
* is 29 because Heisei 16 is a leap year, and if the date of this
* instance is Heisei 17 February 1, it's 28.
*
* @param field the calendar field
* @return the maximum of the given field for the time value of
* this {@code JapaneseImperialCalendar}
* @see #getMinimum(int)
* @see #getMaximum(int)
* @see #getGreatestMinimum(int)
* @see #getLeastMaximum(int)
* @see #getActualMinimum(int)
*/
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);
}
JapaneseImperialCalendar jc = getNormalizedCalendar();
LocalGregorianCalendar.Date date = jc.jdate;
return switch (field) {
case MONTH -> {
int month = DECEMBER;
if (isTransitionYear(date.getNormalizedYear())) {
// TODO: there may be multiple transitions in a year.
int eraIndex = getEraIndex(date);
if (date.getYear() != 1) {
eraIndex++;
assert eraIndex < eras.length;
}
long transition = sinceFixedDates[eraIndex];
long fd = jc.cachedFixedDate;
if (fd < transition) {
LocalGregorianCalendar.Date ldate
= (LocalGregorianCalendar.Date) date.clone();
jcal.getCalendarDateFromFixedDate(ldate, transition - 1);
month = ldate.getMonth() - 1;
}
} else {
LocalGregorianCalendar.Date d = jcal.getCalendarDate(Long.MAX_VALUE, getZone());
if (date.getEra() == d.getEra() && date.getYear() == d.getYear()) {
month = d.getMonth() - 1;
}
}
yield month;
}
case DAY_OF_MONTH -> jcal.getMonthLength(date);
case DAY_OF_YEAR -> {
if (isTransitionYear(date.getNormalizedYear())) {
// Handle transition year.
// TODO: there may be multiple transitions in a year.
int eraIndex = getEraIndex(date);
if (date.getYear() != 1) {
eraIndex++;
assert eraIndex < eras.length;
}
long transition = sinceFixedDates[eraIndex];
long fd = jc.cachedFixedDate;
CalendarDate d = gcal.newCalendarDate(TimeZone.NO_TIMEZONE);
d.setDate(date.getNormalizedYear(), BaseCalendar.JANUARY, 1);
if (fd < transition) {
yield (int) (transition - gcal.getFixedDate(d));
}
d.addYear(1);
yield (int) (gcal.getFixedDate(d) - transition);
}
LocalGregorianCalendar.Date d = jcal.getCalendarDate(Long.MAX_VALUE, getZone());
if (date.getEra() == d.getEra() && date.getYear() == d.getYear()) {
long fd = jcal.getFixedDate(d);
long jan1 = getFixedDateJan1(d, fd);
yield (int) (fd - jan1) + 1;
} else if (date.getYear() == getMinimum(YEAR)) {
CalendarDate d1 = jcal.getCalendarDate(Long.MIN_VALUE, getZone());
long fd1 = jcal.getFixedDate(d1);
d1.addYear(1);
d1.setMonth(BaseCalendar.JANUARY).setDayOfMonth(1);
jcal.normalize(d1);
long fd2 = jcal.getFixedDate(d1);
yield (int) (fd2 - fd1);
} else {
yield jcal.getYearLength(date);
}
}
case WEEK_OF_YEAR -> {
if (!isTransitionYear(date.getNormalizedYear())) {
LocalGregorianCalendar.Date jd = jcal.getCalendarDate(Long.MAX_VALUE, getZone());
if (date.getEra() == jd.getEra() && date.getYear() == jd.getYear()) {
long fd = jcal.getFixedDate(jd);
long jan1 = getFixedDateJan1(jd, fd);
yield getWeekNumber(jan1, fd);
} else if (date.getEra() == null && date.getYear() == getMinimum(YEAR)) {
CalendarDate d = jcal.getCalendarDate(Long.MIN_VALUE, getZone());
// shift 400 years to avoid underflow
d.addYear(+400);
jcal.normalize(d);
jd.setEra(d.getEra());
jd.setDate(d.getYear() + 1, BaseCalendar.JANUARY, 1);
jcal.normalize(jd);
long jan1 = jcal.getFixedDate(d);
long nextJan1 = jcal.getFixedDate(jd);
long nextJan1st = LocalGregorianCalendar.getDayOfWeekDateOnOrBefore(nextJan1 + 6,
getFirstDayOfWeek());
int ndays = (int) (nextJan1st - nextJan1);
if (ndays >= getMinimalDaysInFirstWeek()) {
nextJan1st -= 7;
}
yield getWeekNumber(jan1, nextJan1st);
}
// Get the day of week of January 1 of the year
CalendarDate d = gcal.newCalendarDate(TimeZone.NO_TIMEZONE);
d.setDate(date.getNormalizedYear(), BaseCalendar.JANUARY, 1);
int dayOfWeek = gcal.getDayOfWeek(d);
// Normalize the day of week with the firstDayOfWeek value
dayOfWeek -= getFirstDayOfWeek();
if (dayOfWeek < 0) {
dayOfWeek += 7;
}
int magic = dayOfWeek + getMinimalDaysInFirstWeek() - 1;
if ((magic == 6) ||
(date.isLeapYear() && (magic == 5 || magic == 12))) {
yield 53;
}
yield 52;
}
if (jc == this) {
jc = (JapaneseImperialCalendar) jc.clone();
}
int max = getActualMaximum(DAY_OF_YEAR);
jc.set(DAY_OF_YEAR, max);
int weekOfYear = jc.get(WEEK_OF_YEAR);
if (weekOfYear == 1 && max > 7) {
jc.add(WEEK_OF_YEAR, -1);
weekOfYear = jc.get(WEEK_OF_YEAR);
}
yield weekOfYear;
}
case WEEK_OF_MONTH -> {
LocalGregorianCalendar.Date jd = jcal.getCalendarDate(Long.MAX_VALUE, getZone());
if (date.getEra() == jd.getEra() && date.getYear() == jd.getYear()) {
long fd = jcal.getFixedDate(jd);
long month1 = fd - jd.getDayOfMonth() + 1;
yield getWeekNumber(month1, fd);
}
CalendarDate d = gcal.newCalendarDate(TimeZone.NO_TIMEZONE);
d.setDate(date.getNormalizedYear(), date.getMonth(), 1);
int dayOfWeek = gcal.getDayOfWeek(d);
int monthLength = actualMonthLength();
dayOfWeek -= getFirstDayOfWeek();
if (dayOfWeek < 0) {
dayOfWeek += 7;
}
int nDaysFirstWeek = 7 - dayOfWeek; // # of days in the first week
int weekOfMonth = 3;
if (nDaysFirstWeek >= getMinimalDaysInFirstWeek()) {
weekOfMonth++;
}
monthLength -= nDaysFirstWeek + 7 * 3;
if (monthLength > 0) {
weekOfMonth++;
if (monthLength > 7) {
weekOfMonth++;
}
}
yield weekOfMonth;
}
case DAY_OF_WEEK_IN_MONTH -> {
int ndays, dow1;
int dow = date.getDayOfWeek();
BaseCalendar.Date d = (BaseCalendar.Date) date.clone();
ndays = jcal.getMonthLength(d);
d.setDayOfMonth(1);
jcal.normalize(d);
dow1 = d.getDayOfWeek();
int x = dow - dow1;
if (x < 0) {
x += 7;
}
ndays -= x;
yield (ndays + 6) / 7;
}
case YEAR -> {
CalendarDate jd = jcal.getCalendarDate(jc.getTimeInMillis(), getZone());
CalendarDate d;
int eraIndex = getEraIndex(date);
int year;
if (eraIndex == eras.length - 1) {
d = jcal.getCalendarDate(Long.MAX_VALUE, getZone());
year = d.getYear();
// Use an equivalent year for the
// getYearOffsetInMillis call to avoid overflow.
if (year > 400) {
jd.setYear(year - 400);
}
} else {
d = jcal.getCalendarDate(eras[eraIndex + 1].getSince(getZone()) - 1, getZone());
year = d.getYear();
// Use the same year as d.getYear() to be
// consistent with leap and common years.
jd.setYear(year);
}
jcal.normalize(jd);
if (getYearOffsetInMillis(jd) > getYearOffsetInMillis(d)) {
year--;
}
yield year;
}
default -> throw new ArrayIndexOutOfBoundsException(field);
};
}
/**
* Returns the millisecond offset from the beginning of the
* year. In the year for Long.MIN_VALUE, it's a pseudo value
* beyond the limit. The given CalendarDate object must have been
* normalized before calling this method.
*/
private long getYearOffsetInMillis(CalendarDate date) {
long t = (jcal.getDayOfYear(date) - 1) * ONE_DAY;
return t + date.getTimeOfDay() - date.getZoneOffset();
}
public Object clone() {
JapaneseImperialCalendar other = (JapaneseImperialCalendar) super.clone();
other.jdate = (LocalGregorianCalendar.Date) jdate.clone();
other.originalFields = null;
other.zoneOffsets = null;
return other;
}
public TimeZone getTimeZone() {
TimeZone zone = super.getTimeZone();
// To share the zone by the CalendarDate
jdate.setZone(zone);
return zone;
}
public void setTimeZone(TimeZone zone) {
super.setTimeZone(zone);
// To share the zone by the CalendarDate
jdate.setZone(zone);
}
/**
* The fixed date corresponding to jdate. If the value is
* Long.MIN_VALUE, the fixed date value is unknown.
*/
private transient long cachedFixedDate = Long.MIN_VALUE;
/**
* Converts the time value (millisecond offset from the <a
* href="Calendar.html#Epoch">Epoch</a>) to calendar field values.
* The time is <em>not</em>
* recomputed first; to recompute the time, then the fields, call the
* {@code complete} method.
*
* @see Calendar#complete
*/
protected void computeFields() {
int mask = 0;
if (isPartiallyNormalized()) {
// Determine which calendar fields need to be computed.
mask = getSetStateFields();
int fieldMask = ~mask & ALL_FIELDS;
if (fieldMask != 0 || cachedFixedDate == Long.MIN_VALUE) {
mask |= computeFields(fieldMask,
mask & (ZONE_OFFSET_MASK|DST_OFFSET_MASK));
assert mask == ALL_FIELDS;
}
} else {
// Specify all fields
mask = ALL_FIELDS;
computeFields(mask, 0);
}
// After computing all the fields, set the field state to `COMPUTED'.
setFieldsComputed(mask);
}
/**
* This computeFields implements the conversion from UTC
* (millisecond offset from the Epoch) to calendar
* field values. fieldMask specifies which fields to change the
* setting state to COMPUTED, although all fields are set to
* the correct values. This is required to fix 4685354.
*
* @param fieldMask a bit mask to specify which fields to change
* the setting state.
* @param tzMask a bit mask to specify which time zone offset
* fields to be used for time calculations
* @return a new field mask that indicates what field values have
* actually been set.
*/
private int computeFields(int fieldMask, int tzMask) {
int zoneOffset = 0;
TimeZone tz = getZone();
if (zoneOffsets == null) {
zoneOffsets = new int[2];
}
if (tzMask != (ZONE_OFFSET_MASK|DST_OFFSET_MASK)) {
if (tz instanceof ZoneInfo) {
zoneOffset = ((ZoneInfo)tz).getOffsets(time, zoneOffsets);
} else {
zoneOffset = tz.getOffset(time);
zoneOffsets[0] = tz.getRawOffset();
zoneOffsets[1] = zoneOffset - zoneOffsets[0];
}
}
if (tzMask != 0) {
if (isFieldSet(tzMask, ZONE_OFFSET)) {
zoneOffsets[0] = internalGet(ZONE_OFFSET);
}
if (isFieldSet(tzMask, DST_OFFSET)) {
zoneOffsets[1] = internalGet(DST_OFFSET);
}
zoneOffset = zoneOffsets[0] + zoneOffsets[1];
}
// By computing time and zoneOffset separately, we can take
// the wider range of time+zoneOffset than the previous
// implementation.
long fixedDate = zoneOffset / ONE_DAY;
int timeOfDay = zoneOffset % (int)ONE_DAY;
fixedDate += time / ONE_DAY;
timeOfDay += (int) (time % ONE_DAY);
if (timeOfDay >= ONE_DAY) {
timeOfDay -= (int) ONE_DAY;
++fixedDate;
} else {
while (timeOfDay < 0) {
timeOfDay += (int) ONE_DAY;
--fixedDate;
}
}
fixedDate += EPOCH_OFFSET;
// See if we can use jdate to avoid date calculation.
if (fixedDate != cachedFixedDate || fixedDate < 0) {
jcal.getCalendarDateFromFixedDate(jdate, fixedDate);
cachedFixedDate = fixedDate;
}
int era = getEraIndex(jdate);
int year = jdate.getYear();
// Always set the ERA and YEAR values.
internalSet(ERA, era);
internalSet(YEAR, year);
int mask = fieldMask | (ERA_MASK|YEAR_MASK);
int month = jdate.getMonth() - 1; // 0-based
int dayOfMonth = jdate.getDayOfMonth();
// Set the basic date fields.
if ((fieldMask & (MONTH_MASK|DAY_OF_MONTH_MASK|DAY_OF_WEEK_MASK))
!= 0) {
internalSet(MONTH, month);
internalSet(DAY_OF_MONTH, dayOfMonth);
internalSet(DAY_OF_WEEK, jdate.getDayOfWeek());
mask |= MONTH_MASK|DAY_OF_MONTH_MASK|DAY_OF_WEEK_MASK;
}
if ((fieldMask & (HOUR_OF_DAY_MASK|AM_PM_MASK|HOUR_MASK
|MINUTE_MASK|SECOND_MASK|MILLISECOND_MASK)) != 0) {
if (timeOfDay != 0) {
int hours = timeOfDay / ONE_HOUR;
internalSet(HOUR_OF_DAY, hours);
internalSet(AM_PM, hours / 12); // Assume AM == 0
internalSet(HOUR, hours % 12);
int r = timeOfDay % ONE_HOUR;
internalSet(MINUTE, r / ONE_MINUTE);
r %= ONE_MINUTE;
internalSet(SECOND, r / ONE_SECOND);
internalSet(MILLISECOND, r % ONE_SECOND);
} else {
internalSet(HOUR_OF_DAY, 0);
internalSet(AM_PM, AM);
internalSet(HOUR, 0);
internalSet(MINUTE, 0);
internalSet(SECOND, 0);
internalSet(MILLISECOND, 0);
}
mask |= (HOUR_OF_DAY_MASK|AM_PM_MASK|HOUR_MASK
|MINUTE_MASK|SECOND_MASK|MILLISECOND_MASK);
}
if ((fieldMask & (ZONE_OFFSET_MASK|DST_OFFSET_MASK)) != 0) {
internalSet(ZONE_OFFSET, zoneOffsets[0]);
internalSet(DST_OFFSET, zoneOffsets[1]);
mask |= (ZONE_OFFSET_MASK|DST_OFFSET_MASK);
}
if ((fieldMask & (DAY_OF_YEAR_MASK|WEEK_OF_YEAR_MASK
|WEEK_OF_MONTH_MASK|DAY_OF_WEEK_IN_MONTH_MASK)) != 0) {
int normalizedYear = jdate.getNormalizedYear();
// If it's a year of an era transition, we need to handle
// irregular year boundaries.
boolean transitionYear = isTransitionYear(jdate.getNormalizedYear());
int dayOfYear;
long fixedDateJan1;
if (transitionYear) {
fixedDateJan1 = getFixedDateJan1(jdate, fixedDate);
dayOfYear = (int)(fixedDate - fixedDateJan1) + 1;
} else if (normalizedYear == MIN_VALUES[YEAR]) {
CalendarDate dx = jcal.getCalendarDate(Long.MIN_VALUE, getZone());
fixedDateJan1 = jcal.getFixedDate(dx);
dayOfYear = (int)(fixedDate - fixedDateJan1) + 1;
} else {
dayOfYear = (int) jcal.getDayOfYear(jdate);
fixedDateJan1 = fixedDate - dayOfYear + 1;
}
long fixedDateMonth1 = transitionYear ?
getFixedDateMonth1(jdate, fixedDate) : fixedDate - dayOfMonth + 1;
internalSet(DAY_OF_YEAR, dayOfYear);
internalSet(DAY_OF_WEEK_IN_MONTH, (dayOfMonth - 1) / 7 + 1);
int weekOfYear = getWeekNumber(fixedDateJan1, fixedDate);
// The spec is to calculate WEEK_OF_YEAR in the
// ISO8601-style. This creates problems, though.
if (weekOfYear == 0) {
// If the date belongs to the last week of the
// previous year, use the week number of "12/31" of
// the "previous" year. Again, if the previous year is
// a transition year, we need to take care of it.
// Usually the previous day of the first day of a year
// is December 31, which is not always true in the
// Japanese imperial calendar system.
long fixedDec31 = fixedDateJan1 - 1;
long prevJan1;
LocalGregorianCalendar.Date d = getCalendarDate(fixedDec31);
if (!(transitionYear || isTransitionYear(d.getNormalizedYear()))) {
prevJan1 = fixedDateJan1 - 365;
if (d.isLeapYear()) {
--prevJan1;
}
} else if (transitionYear) {
if (jdate.getYear() == 1) {
// As of Reiwa (since Meiji) there's no case
// that there are multiple transitions in a
// year. Historically there was such
// case. There might be such case again in the
// future.
if (era > REIWA) {
CalendarDate pd = eras[era - 1].getSinceDate();
if (normalizedYear == pd.getYear()) {
d.setMonth(pd.getMonth()).setDayOfMonth(pd.getDayOfMonth());
}
} else {
d.setMonth(LocalGregorianCalendar.JANUARY).setDayOfMonth(1);
}
jcal.normalize(d);
prevJan1 = jcal.getFixedDate(d);
} else {
prevJan1 = fixedDateJan1 - 365;
if (d.isLeapYear()) {
--prevJan1;
}
}
} else {
CalendarDate cd = eras[getEraIndex(jdate)].getSinceDate();
d.setMonth(cd.getMonth()).setDayOfMonth(cd.getDayOfMonth());
jcal.normalize(d);
prevJan1 = jcal.getFixedDate(d);
}
weekOfYear = getWeekNumber(prevJan1, fixedDec31);
} else {
if (!transitionYear) {
// Regular years
if (weekOfYear >= 52) {
long nextJan1 = fixedDateJan1 + 365;
if (jdate.isLeapYear()) {
nextJan1++;
}
long nextJan1st = LocalGregorianCalendar.getDayOfWeekDateOnOrBefore(nextJan1 + 6,
getFirstDayOfWeek());
int ndays = (int)(nextJan1st - nextJan1);
if (ndays >= getMinimalDaysInFirstWeek() && fixedDate >= (nextJan1st - 7)) {
// The first days forms a week in which the date is included.
weekOfYear = 1;
}
}
} else {
LocalGregorianCalendar.Date d = (LocalGregorianCalendar.Date) jdate.clone();
long nextJan1;
if (jdate.getYear() == 1) {
d.addYear(+1);
d.setMonth(LocalGregorianCalendar.JANUARY).setDayOfMonth(1);
nextJan1 = jcal.getFixedDate(d);
} else {
int nextEraIndex = getEraIndex(d) + 1;
CalendarDate cd = eras[nextEraIndex].getSinceDate();
d.setEra(eras[nextEraIndex]);
d.setDate(1, cd.getMonth(), cd.getDayOfMonth());
jcal.normalize(d);
nextJan1 = jcal.getFixedDate(d);
}
long nextJan1st = LocalGregorianCalendar.getDayOfWeekDateOnOrBefore(nextJan1 + 6,
getFirstDayOfWeek());
int ndays = (int)(nextJan1st - nextJan1);
if (ndays >= getMinimalDaysInFirstWeek() && fixedDate >= (nextJan1st - 7)) {
// The first days forms a week in which the date is included.
weekOfYear = 1;
}
}
}
internalSet(WEEK_OF_YEAR, weekOfYear);
internalSet(WEEK_OF_MONTH, getWeekNumber(fixedDateMonth1, fixedDate));
mask |= (DAY_OF_YEAR_MASK|WEEK_OF_YEAR_MASK|WEEK_OF_MONTH_MASK|DAY_OF_WEEK_IN_MONTH_MASK);
}
return mask;
}
/**
* Returns the number of weeks in a period between fixedDay1 and
* fixedDate. The getFirstDayOfWeek-getMinimalDaysInFirstWeek rule
* is applied to calculate the number of weeks.
*
* @param fixedDay1 the fixed date of the first day of the period
* @param fixedDate the fixed date of the last day of the period
* @return the number of weeks of the given period
*/
private int getWeekNumber(long fixedDay1, long fixedDate) {
// We can always use `jcal' since Julian and Gregorian are the
// same thing for this calculation.
long fixedDay1st = LocalGregorianCalendar.getDayOfWeekDateOnOrBefore(fixedDay1 + 6,
getFirstDayOfWeek());
int ndays = (int)(fixedDay1st - fixedDay1);
assert ndays <= 7;
if (ndays >= getMinimalDaysInFirstWeek()) {
fixedDay1st -= 7;
}
int normalizedDayOfPeriod = (int)(fixedDate - fixedDay1st);
if (normalizedDayOfPeriod >= 0) {
return normalizedDayOfPeriod / 7 + 1;
}
return CalendarUtils.floorDivide(normalizedDayOfPeriod, 7) + 1;
}
/**
* Converts calendar field values to the time value (millisecond
* offset from the <a href="Calendar.html#Epoch">Epoch</a>).
*
* @throws IllegalArgumentException if any calendar fields are invalid.
*/
protected void computeTime() {
// In non-lenient mode, perform brief checking of calendar
// fields which have been set externally. Through this
// checking, the field values are stored in originalFields[]
// to see if any of them are normalized later.
if (!isLenient()) {
if (originalFields == null) {
originalFields = new int[FIELD_COUNT];
}
for (int field = 0; field < FIELD_COUNT; field++) {
int value = internalGet(field);
if (isExternallySet(field)) {
// Quick validation for any out of range values
if (value < getMinimum(field) || value > getMaximum(field)) {
throw new IllegalArgumentException(getFieldName(field));
}
}
originalFields[field] = value;
}
}
// Let the super class determine which calendar fields to be
// used to calculate the time.
int fieldMask = selectFields();
int year;
int era;
if (isSet(ERA)) {
era = internalGet(ERA);
// Don't check under, historically we have allowed values under
// BEFORE_MEIJI to be ignored during normalization
// We check against eras.length (not the highest constant ERA value)
// due to future added eras, or additional eras via
// "jdk.calendar.japanese.supplemental.era"
if (era >= eras.length) {
throw new IllegalArgumentException("Invalid era");
}
year = isSet(YEAR) ? internalGet(YEAR) : 1;
} else {
if (isSet(YEAR)) {
era = currentEra;
year = internalGet(YEAR);
} else {
// Equivalent to 1970 (Gregorian)
era = SHOWA;
year = 45;
}
}
// Calculate the time of day. We rely on the convention that
// an UNSET field has 0.
long timeOfDay = 0;
if (isFieldSet(fieldMask, HOUR_OF_DAY)) {
timeOfDay += (long) internalGet(HOUR_OF_DAY);
} else {
timeOfDay += internalGet(HOUR);
// The default value of AM_PM is 0 which designates AM.
if (isFieldSet(fieldMask, AM_PM)) {
timeOfDay += 12 * internalGet(AM_PM);
}
}
timeOfDay *= 60;
timeOfDay += internalGet(MINUTE);
timeOfDay *= 60;
timeOfDay += internalGet(SECOND);
timeOfDay *= 1000;
timeOfDay += internalGet(MILLISECOND);
// Convert the time of day to the number of days and the
// millisecond offset from midnight.
long fixedDate = timeOfDay / ONE_DAY;
timeOfDay %= ONE_DAY;
while (timeOfDay < 0) {
timeOfDay += ONE_DAY;
--fixedDate;
}
// Calculate the fixed date since January 1, 1 (Gregorian).
fixedDate += getFixedDate(era, year, fieldMask);
// millis represents local wall-clock time in milliseconds.
long millis = (fixedDate - EPOCH_OFFSET) * ONE_DAY + timeOfDay;
// Compute the time zone offset and DST offset. There are two potential
// ambiguities here. We'll assume a 2:00 am (wall time) switchover time
// for discussion purposes here.
// 1. The transition into DST. Here, a designated time of 2:00 am - 2:59 am
// can be in standard or in DST depending. However, 2:00 am is an invalid
// representation (the representation jumps from 1:59:59 am Std to 3:00:00 am DST).
// We assume standard time.
// 2. The transition out of DST. Here, a designated time of 1:00 am - 1:59 am
// can be in standard or DST. Both are valid representations (the rep
// jumps from 1:59:59 DST to 1:00:00 Std).
// Again, we assume standard time.
// We use the TimeZone object, unless the user has explicitly set the ZONE_OFFSET
// or DST_OFFSET fields; then we use those fields.
TimeZone zone = getZone();
if (zoneOffsets == null) {
zoneOffsets = new int[2];
}
int tzMask = fieldMask & (ZONE_OFFSET_MASK|DST_OFFSET_MASK);
if (tzMask != (ZONE_OFFSET_MASK|DST_OFFSET_MASK)) {
if (zone instanceof ZoneInfo) {
((ZoneInfo)zone).getOffsetsByWall(millis, zoneOffsets);
} else {
zone.getOffsets(millis - zone.getRawOffset(), zoneOffsets);
}
}
if (tzMask != 0) {
if (isFieldSet(tzMask, ZONE_OFFSET)) {
zoneOffsets[0] = internalGet(ZONE_OFFSET);
}
if (isFieldSet(tzMask, DST_OFFSET)) {
zoneOffsets[1] = internalGet(DST_OFFSET);
}
}
// Adjust the time zone offset values to get the UTC time.
millis -= zoneOffsets[0] + zoneOffsets[1];
// Set this calendar's time in milliseconds
time = millis;
int mask = computeFields(fieldMask | getSetStateFields(), tzMask);
if (!isLenient()) {
for (int field = 0; field < FIELD_COUNT; field++) {
if (!isExternallySet(field)) {
continue;
}
if (originalFields[field] != internalGet(field)) {
int wrongValue = internalGet(field);
// Restore the original field values
System.arraycopy(originalFields, 0, fields, 0, fields.length);
throw new IllegalArgumentException(getFieldName(field) + "=" + wrongValue
+ ", expected " + originalFields[field]);
}
}
}
setFieldsNormalized(mask);
}
/**
* Computes the fixed date under either the Gregorian or the
* Julian calendar, using the given year and the specified calendar fields.
*
* @param era era index
* @param year the normalized year number, with 0 indicating the
* year 1 BCE, -1 indicating 2 BCE, etc.
* @param fieldMask the calendar fields to be used for the date calculation
* @return the fixed date
* @see Calendar#selectFields
*/
private long getFixedDate(int era, int year, int fieldMask) {
int month = JANUARY;
int firstDayOfMonth = 1;
if (isFieldSet(fieldMask, MONTH)) {
// No need to check if MONTH has been set (no isSet(MONTH)
// call) since its unset value happens to be JANUARY (0).
month = internalGet(MONTH);
// If the month is out of range, adjust it into range.
if (month > DECEMBER) {
year += month / 12;
month %= 12;
} else if (month < JANUARY) {
int[] rem = new int[1];
year += CalendarUtils.floorDivide(month, 12, rem);
month = rem[0];
}
} else {
if (year == 1 && era != 0) {
CalendarDate d = eras[era].getSinceDate();
month = d.getMonth() - 1;
firstDayOfMonth = d.getDayOfMonth();
}
}
// Adjust the base date if year is the minimum value.
if (year == MIN_VALUES[YEAR]) {
CalendarDate dx = jcal.getCalendarDate(Long.MIN_VALUE, getZone());
int m = dx.getMonth() - 1;
if (month < m) {
month = m;
}
if (month == m) {
firstDayOfMonth = dx.getDayOfMonth();
}
}
LocalGregorianCalendar.Date date = jcal.newCalendarDate(TimeZone.NO_TIMEZONE);
date.setEra(era > 0 ? eras[era] : null);
date.setDate(year, month + 1, firstDayOfMonth);
jcal.normalize(date);
// Get the fixed date since Jan 1, 1 (Gregorian). We are on
// the first day of either `month' or January in 'year'.
long fixedDate = jcal.getFixedDate(date);
if (isFieldSet(fieldMask, MONTH)) {
// Month-based calculations
if (isFieldSet(fieldMask, DAY_OF_MONTH)) {
// We are on the "first day" of the month (which may
// not be 1). Just add the offset if DAY_OF_MONTH is
// set. If the isSet call returns false, that means
// DAY_OF_MONTH has been selected just because of the
// selected combination. We don't need to add any
// since the default value is the "first day".
if (isSet(DAY_OF_MONTH)) {
// To avoid underflow with DAY_OF_MONTH-firstDayOfMonth, add
// DAY_OF_MONTH, then subtract firstDayOfMonth.
fixedDate += internalGet(DAY_OF_MONTH);
fixedDate -= firstDayOfMonth;
}
} else {
if (isFieldSet(fieldMask, WEEK_OF_MONTH)) {
long firstDayOfWeek = LocalGregorianCalendar.getDayOfWeekDateOnOrBefore(fixedDate + 6,
getFirstDayOfWeek());
// If we have enough days in the first week, then
// move to the previous week.
if ((firstDayOfWeek - fixedDate) >= getMinimalDaysInFirstWeek()) {
firstDayOfWeek -= 7;
}
if (isFieldSet(fieldMask, DAY_OF_WEEK)) {
firstDayOfWeek = LocalGregorianCalendar.getDayOfWeekDateOnOrBefore(firstDayOfWeek + 6,
internalGet(DAY_OF_WEEK));
}
// In lenient mode, we treat days of the previous
// months as a part of the specified
// WEEK_OF_MONTH. See 4633646.
fixedDate = firstDayOfWeek + 7 * (internalGet(WEEK_OF_MONTH) - 1);
} else {
int dayOfWeek;
if (isFieldSet(fieldMask, DAY_OF_WEEK)) {
dayOfWeek = internalGet(DAY_OF_WEEK);
} else {
dayOfWeek = getFirstDayOfWeek();
}
// We are basing this on the day-of-week-in-month. The only
// trickiness occurs if the day-of-week-in-month is
// negative.
int dowim;
if (isFieldSet(fieldMask, DAY_OF_WEEK_IN_MONTH)) {
dowim = internalGet(DAY_OF_WEEK_IN_MONTH);
} else {
dowim = 1;
}
if (dowim >= 0) {
fixedDate = LocalGregorianCalendar.getDayOfWeekDateOnOrBefore(fixedDate + (7 * dowim) - 1,
dayOfWeek);
} else {
// Go to the first day of the next week of
// the specified week boundary.
int lastDate = monthLength(month, year) + (7 * (dowim + 1));
// Then, get the day of week date on or before the last date.
fixedDate = LocalGregorianCalendar.getDayOfWeekDateOnOrBefore(fixedDate + lastDate - 1,
dayOfWeek);
}
}
}
} else {
// We are on the first day of the year.
if (isFieldSet(fieldMask, DAY_OF_YEAR)) {
if (isTransitionYear(date.getNormalizedYear())) {
fixedDate = getFixedDateJan1(date, fixedDate);
}
// Add the offset, then subtract 1. (Make sure to avoid underflow.)
fixedDate += internalGet(DAY_OF_YEAR);
fixedDate--;
} else {
long firstDayOfWeek = LocalGregorianCalendar.getDayOfWeekDateOnOrBefore(fixedDate + 6,
getFirstDayOfWeek());
// If we have enough days in the first week, then move
// to the previous week.
if ((firstDayOfWeek - fixedDate) >= getMinimalDaysInFirstWeek()) {
firstDayOfWeek -= 7;
}
if (isFieldSet(fieldMask, DAY_OF_WEEK)) {
int dayOfWeek = internalGet(DAY_OF_WEEK);
if (dayOfWeek != getFirstDayOfWeek()) {
firstDayOfWeek = LocalGregorianCalendar.getDayOfWeekDateOnOrBefore(firstDayOfWeek + 6,
dayOfWeek);
}
}
fixedDate = firstDayOfWeek + 7 * ((long)internalGet(WEEK_OF_YEAR) - 1);
}
}
return fixedDate;
}
/**
* Returns the fixed date of the first day of the year (usually
* January 1) before the specified date.
*
* @param date the date for which the first day of the year is
* calculated. The date has to be in the cut-over year.
* @param fixedDate the fixed date representation of the date
*/
private long getFixedDateJan1(LocalGregorianCalendar.Date date, long fixedDate) {
if (date.getEra() != null && date.getYear() == 1) {
for (int eraIndex = getEraIndex(date); eraIndex > 0; eraIndex--) {
CalendarDate d = eras[eraIndex].getSinceDate();
long fd = gcal.getFixedDate(d);
// There might be multiple era transitions in a year.
if (fd > fixedDate) {
continue;
}
return fd;
}
}
CalendarDate d = gcal.newCalendarDate(TimeZone.NO_TIMEZONE);
d.setDate(date.getNormalizedYear(), Gregorian.JANUARY, 1);
return gcal.getFixedDate(d);
}
/**
* Returns the fixed date of the first date of the month (usually
* the 1st of the month) before the specified date.
*
* @param date the date for which the first day of the month is
* calculated. The date must be in the era transition year.
* @param fixedDate the fixed date representation of the date
*/
private long getFixedDateMonth1(LocalGregorianCalendar.Date date,
long fixedDate) {
int eraIndex = getTransitionEraIndex(date);
if (eraIndex != -1) {
long transition = sinceFixedDates[eraIndex];
// If the given date is on or after the transition date, then
// return the transition date.
if (transition <= fixedDate) {
return transition;
}
}
// Otherwise, we can use the 1st day of the month.
return fixedDate - date.getDayOfMonth() + 1;
}
/**
* Returns a LocalGregorianCalendar.Date produced from the specified fixed date.
*
* @param fd the fixed date
*/
private static LocalGregorianCalendar.Date getCalendarDate(long fd) {
LocalGregorianCalendar.Date d = jcal.newCalendarDate(TimeZone.NO_TIMEZONE);
jcal.getCalendarDateFromFixedDate(d, fd);
return d;
}
/**
* Returns the length of the specified month in the specified
* Gregorian year. The year number must be normalized.
*
* @see GregorianCalendar#isLeapYear(int)
*/
private int monthLength(int month, int gregorianYear) {
return CalendarUtils.isGregorianLeapYear(gregorianYear) ?
GregorianCalendar.LEAP_MONTH_LENGTH[month] : GregorianCalendar.MONTH_LENGTH[month];
}
/**
* Returns the length of the specified month in the year provided
* by internalGet(YEAR).
*
* @see GregorianCalendar#isLeapYear(int)
*/
private int monthLength(int month) {
assert jdate.isNormalized();
return jdate.isLeapYear() ?
GregorianCalendar.LEAP_MONTH_LENGTH[month] : GregorianCalendar.MONTH_LENGTH[month];
}
private int actualMonthLength() {
int length = jcal.getMonthLength(jdate);
int eraIndex = getTransitionEraIndex(jdate);
if (eraIndex != -1) {
long transitionFixedDate = sinceFixedDates[eraIndex];
CalendarDate d = eras[eraIndex].getSinceDate();
if (transitionFixedDate <= cachedFixedDate) {
length -= d.getDayOfMonth() - 1;
} else {
length = d.getDayOfMonth() - 1;
}
}
return length;
}
/**
* Returns the index to the new era if the given date is in a
* transition month. For example, if the give date is Heisei 1
* (1989) January 20, then the era index for Heisei is
* returned. Likewise, if the given date is Showa 64 (1989)
* January 3, then the era index for Heisei is returned. If the
* given date is not in any transition month, then -1 is returned.
*/
private static int getTransitionEraIndex(LocalGregorianCalendar.Date date) {
int eraIndex = getEraIndex(date);
CalendarDate transitionDate = eras[eraIndex].getSinceDate();
if (transitionDate.getYear() == date.getNormalizedYear() &&
transitionDate.getMonth() == date.getMonth()) {
return eraIndex;
}
if (eraIndex < eras.length - 1) {
transitionDate = eras[++eraIndex].getSinceDate();
if (transitionDate.getYear() == date.getNormalizedYear() &&
transitionDate.getMonth() == date.getMonth()) {
return eraIndex;
}
}
return -1;
}
private boolean isTransitionYear(int normalizedYear) {
for (int i = eras.length - 1; i > 0; i--) {
int transitionYear = eras[i].getSinceDate().getYear();
if (normalizedYear == transitionYear) {
return true;
}
if (normalizedYear > transitionYear) {
break;
}
}
return false;
}
private static int getEraIndex(LocalGregorianCalendar.Date date) {
Era era = date.getEra();
for (int i = eras.length - 1; i > 0; i--) {
if (eras[i] == era) {
return i;
}
}
return 0;
}
/**
* Returns this object if it's normalized (all fields and time are
* in sync). Otherwise, a cloned object is returned after calling
* complete() in lenient mode.
*/
private JapaneseImperialCalendar getNormalizedCalendar() {
JapaneseImperialCalendar jc;
if (isFullyNormalized()) {
jc = this;
} else {
// Create a clone and normalize the calendar fields
jc = (JapaneseImperialCalendar) this.clone();
jc.setLenient(true);
jc.complete();
}
return jc;
}
/**
* After adjustments such as add(MONTH), add(YEAR), we don't want the
* month to jump around. E.g., we don't want Jan 31 + 1 month to go to Mar
* 3, we want it to go to Feb 28. Adjustments which might run into this
* problem call this method to retain the proper month.
*/
private void pinDayOfMonth(LocalGregorianCalendar.Date date) {
int year = date.getYear();
int dom = date.getDayOfMonth();
if (year != getMinimum(YEAR)) {
date.setDayOfMonth(1);
jcal.normalize(date);
int monthLength = jcal.getMonthLength(date);
if (dom > monthLength) {
date.setDayOfMonth(monthLength);
} else {
date.setDayOfMonth(dom);
}
jcal.normalize(date);
} else {
LocalGregorianCalendar.Date d = jcal.getCalendarDate(Long.MIN_VALUE, getZone());
LocalGregorianCalendar.Date realDate = jcal.getCalendarDate(time, getZone());
long tod = realDate.getTimeOfDay();
// Use an equivalent year.
realDate.addYear(+400);
realDate.setMonth(date.getMonth());
realDate.setDayOfMonth(1);
jcal.normalize(realDate);
int monthLength = jcal.getMonthLength(realDate);
if (dom > monthLength) {
realDate.setDayOfMonth(monthLength);
} else {
if (dom < d.getDayOfMonth()) {
realDate.setDayOfMonth(d.getDayOfMonth());
} else {
realDate.setDayOfMonth(dom);
}
}
if (realDate.getDayOfMonth() == d.getDayOfMonth() && tod < d.getTimeOfDay()) {
realDate.setDayOfMonth(Math.min(dom + 1, monthLength));
}
// restore the year.
date.setDate(year, realDate.getMonth(), realDate.getDayOfMonth());
// Don't normalize date here so as not to cause underflow.
}
}
/**
* Returns the new value after 'roll'ing the specified value and amount.
*/
private static int getRolledValue(int value, int amount, int min, int max) {
assert value >= min && value <= max;
int range = max - min + 1;
amount %= range;
int n = value + amount;
if (n > max) {
n -= range;
} else if (n < min) {
n += range;
}
assert n >= min && n <= max;
return n;
}
/**
* Returns the ERA. We need a special method for this because the
* default ERA is the current era, but a zero (unset) ERA means before Meiji.
*/
private int internalGetEra() {
return isSet(ERA) ? internalGet(ERA) : currentEra;
}
/**
* Updates internal state.
*/
@java.io.Serial
private void readObject(ObjectInputStream stream)
throws IOException, ClassNotFoundException {
stream.defaultReadObject();
if (jdate == null) {
jdate = jcal.newCalendarDate(getZone());
cachedFixedDate = Long.MIN_VALUE;
}
}
}