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JapaneseImperialCalendar.java
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JapaneseImperialCalendar.java
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/*
* Copyright (c) 2005, 2018, 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 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 NewEra 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 NewEra era.
*/
private static final int NEWERA = 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")
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.
* @exception 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}.
* @exception 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, (int)(nfd - month1) + 1);
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());