/*
* Copyright (c) 2007-present, Stephen Colebourne & Michael Nascimento Santos
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of JSR-310 nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.threeten.bp.chrono;
import static org.threeten.bp.temporal.ChronoField.DAY_OF_MONTH;
import static org.threeten.bp.temporal.ChronoField.MONTH_OF_YEAR;
import static org.threeten.bp.temporal.ChronoField.YEAR;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.util.Calendar;
import org.threeten.bp.Clock;
import org.threeten.bp.DateTimeException;
import org.threeten.bp.LocalDate;
import org.threeten.bp.LocalTime;
import org.threeten.bp.Period;
import org.threeten.bp.ZoneId;
import org.threeten.bp.jdk8.Jdk8Methods;
import org.threeten.bp.temporal.ChronoField;
import org.threeten.bp.temporal.TemporalAccessor;
import org.threeten.bp.temporal.TemporalAdjuster;
import org.threeten.bp.temporal.TemporalAmount;
import org.threeten.bp.temporal.TemporalField;
import org.threeten.bp.temporal.TemporalQuery;
import org.threeten.bp.temporal.TemporalUnit;
import org.threeten.bp.temporal.UnsupportedTemporalTypeException;
import org.threeten.bp.temporal.ValueRange;
/**
* A date in the Japanese Imperial calendar system.
* <p>
* This date operates using the {@linkplain JapaneseChronology Japanese Imperial calendar}.
* This calendar system is primarily used in Japan.
* <p>
* The Japanese Imperial calendar system is the same as the ISO calendar system
* apart from the era-based year numbering. The proleptic-year is defined to be
* equal to the ISO proleptic-year.
* <p>
* Japan introduced the Gregorian calendar starting with Meiji 6.
* Only Meiji and later eras are supported.
* <p>
* For example, the Japanese year "Heisei 24" corresponds to ISO year "2012".<br>
* Calling {@code japaneseDate.get(YEAR_OF_ERA)} will return 24.<br>
* Calling {@code japaneseDate.get(YEAR)} will return 2012.<br>
* Calling {@code japaneseDate.get(ERA)} will return 2, corresponding to
* {@code JapaneseChEra.HEISEI}.<br>
*
* <h3>Specification for implementors</h3>
* This class is immutable and thread-safe.
*/
public final class JapaneseDate
extends ChronoDateImpl<JapaneseDate>
implements Serializable {
/**
* Serialization version.
*/
private static final long serialVersionUID = -305327627230580483L;
/**
* Minimum date.
*/
static final LocalDate MIN_DATE = LocalDate.of(1873, 1, 1);
/**
* The underlying ISO local date.
* @serial
*/
private final LocalDate isoDate;
/**
* The JapaneseEra of this date.
*/
private transient JapaneseEra era;
/**
* The Japanese imperial calendar year of this date.
*/
private transient int yearOfEra;
//-----------------------------------------------------------------------
/**
* Obtains the current {@code JapaneseDate} from the system clock in the default time-zone.
* <p>
* This will query the {@link Clock#systemDefaultZone() system clock} in the default
* time-zone to obtain the current date.
* <p>
* Using this method will prevent the ability to use an alternate clock for testing
* because the clock is hard-coded.
*
* @return the current date using the system clock and default time-zone, not null
*/
public static JapaneseDate now() {
return now(Clock.systemDefaultZone());
}
/**
* Obtains the current {@code JapaneseDate} from the system clock in the specified time-zone.
* <p>
* This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date.
* Specifying the time-zone avoids dependence on the default time-zone.
* <p>
* Using this method will prevent the ability to use an alternate clock for testing
* because the clock is hard-coded.
*
* @param zone the zone ID to use, not null
* @return the current date using the system clock, not null
*/
public static JapaneseDate now(ZoneId zone) {
return now(Clock.system(zone));
}
/**
* Obtains the current {@code JapaneseDate} from the specified clock.
* <p>
* This will query the specified clock to obtain the current date - today.
* Using this method allows the use of an alternate clock for testing.
* The alternate clock may be introduced using {@linkplain Clock dependency injection}.
*
* @param clock the clock to use, not null
* @return the current date, not null
* @throws DateTimeException if the current date cannot be obtained
*/
public static JapaneseDate now(Clock clock) {
return new JapaneseDate(LocalDate.now(clock));
}
/**
* Obtains a {@code JapaneseDate} representing a date in the Japanese calendar
* system from the era, year-of-era, month-of-year and day-of-month fields.
* <p>
* This returns a {@code JapaneseDate} with the specified fields.
* The day must be valid for the year and month, otherwise an exception will be thrown.
* <p>
* The Japanese month and day-of-month are the same as those in the
* ISO calendar system. They are not reset when the era changes.
* For example:
* <pre>
* 6th Jan Showa 64 = ISO 1989-01-06
* 7th Jan Showa 64 = ISO 1989-01-07
* 8th Jan Heisei 1 = ISO 1989-01-08
* 9th Jan Heisei 1 = ISO 1989-01-09
* </pre>
*
* @param era the Japanese era, not null
* @param yearOfEra the Japanese year-of-era
* @param month the Japanese month-of-year, from 1 to 12
* @param dayOfMonth the Japanese day-of-month, from 1 to 31
* @return the date in Japanese calendar system, not null
* @throws DateTimeException if the value of any field is out of range,
* or if the day-of-month is invalid for the month-year
*/
public static JapaneseDate of(JapaneseEra era, int yearOfEra, int month, int dayOfMonth) {
Jdk8Methods.requireNonNull(era, "era");
if (yearOfEra < 1) {
throw new DateTimeException("Invalid YearOfEra: " + yearOfEra);
}
LocalDate eraStartDate = era.startDate();
LocalDate eraEndDate = era.endDate();
int yearOffset = eraStartDate.getYear() - 1;
LocalDate date = LocalDate.of(yearOfEra + yearOffset, month, dayOfMonth);
if (date.isBefore(eraStartDate) || date.isAfter(eraEndDate)) {
throw new DateTimeException("Requested date is outside bounds of era " + era);
}
return new JapaneseDate(era, yearOfEra, date);
}
/**
* Obtains a {@code JapaneseDate} representing a date in the Japanese calendar
* system from the era, year-of-era and day-of-year fields.
* <p>
* This returns a {@code JapaneseDate} with the specified fields.
* The day must be valid for the year, otherwise an exception will be thrown.
* The Japanese day-of-year is reset when the era changes.
*
* @param era the Japanese era, not null
* @param yearOfEra the Japanese year-of-era
* @param dayOfYear the Japanese day-of-year, from 1 to 31
* @return the date in Japanese calendar system, not null
* @throws DateTimeException if the value of any field is out of range,
* or if the day-of-year is invalid for the year
*/
static JapaneseDate ofYearDay(JapaneseEra era, int yearOfEra, int dayOfYear) {
Jdk8Methods.requireNonNull(era, "era");
if (yearOfEra < 1) {
throw new DateTimeException("Invalid YearOfEra: " + yearOfEra);
}
LocalDate eraStartDate = era.startDate();
LocalDate eraEndDate = era.endDate();
if (yearOfEra == 1) {
dayOfYear += eraStartDate.getDayOfYear() - 1;
if (dayOfYear > eraStartDate.lengthOfYear()) {
throw new DateTimeException("DayOfYear exceeds maximum allowed in the first year of era " + era);
}
}
int yearOffset = eraStartDate.getYear() - 1;
LocalDate isoDate = LocalDate.ofYearDay(yearOfEra + yearOffset, dayOfYear);
if (isoDate.isBefore(eraStartDate) || isoDate.isAfter(eraEndDate)) {
throw new DateTimeException("Requested date is outside bounds of era " + era);
}
return new JapaneseDate(era, yearOfEra, isoDate);
}
/**
* Obtains a {@code JapaneseDate} representing a date in the Japanese calendar
* system from the proleptic-year, month-of-year and day-of-month fields.
* <p>
* This returns a {@code JapaneseDate} with the specified fields.
* The day must be valid for the year and month, otherwise an exception will be thrown.
* <p>
* The Japanese proleptic year, month and day-of-month are the same as those
* in the ISO calendar system. They are not reset when the era changes.
*
* @param prolepticYear the Japanese proleptic-year
* @param month the Japanese month-of-year, from 1 to 12
* @param dayOfMonth the Japanese day-of-month, from 1 to 31
* @return the date in Japanese calendar system, not null
* @throws DateTimeException if the value of any field is out of range,
* or if the day-of-month is invalid for the month-year
*/
public static JapaneseDate of(int prolepticYear, int month, int dayOfMonth) {
return new JapaneseDate(LocalDate.of(prolepticYear, month, dayOfMonth));
}
/**
* Obtains a {@code JapaneseDate} from a temporal object.
* <p>
* This obtains a date in the Japanese calendar system based on the specified temporal.
* A {@code TemporalAccessor} represents an arbitrary set of date and time information,
* which this factory converts to an instance of {@code JapaneseDate}.
* <p>
* The conversion typically uses the {@link ChronoField#EPOCH_DAY EPOCH_DAY}
* field, which is standardized across calendar systems.
* <p>
* This method matches the signature of the functional interface {@link TemporalQuery}
* allowing it to be used as a query via method reference, {@code JapaneseDate::from}.
*
* @param temporal the temporal object to convert, not null
* @return the date in Japanese calendar system, not null
* @throws DateTimeException if unable to convert to a {@code JapaneseDate}
*/
public static JapaneseDate from(TemporalAccessor temporal) {
return JapaneseChronology.INSTANCE.date(temporal);
}
//-----------------------------------------------------------------------
/**
* Creates an instance from an ISO date.
*
* @param isoDate the standard local date, validated not null
*/
JapaneseDate(LocalDate isoDate) {
if (isoDate.isBefore(MIN_DATE)) {
throw new DateTimeException("Minimum supported date is January 1st Meiji 6");
}
this.era = JapaneseEra.from(isoDate);
int yearOffset = this.era.startDate().getYear() - 1;
this.yearOfEra = isoDate.getYear() - yearOffset;
this.isoDate = isoDate;
}
/**
* Constructs a {@code JapaneseDate}. This constructor does NOT validate the given parameters,
* and {@code era} and {@code year} must agree with {@code isoDate}.
*
* @param era the era, validated not null
* @param year the year-of-era, validated
* @param isoDate the standard local date, validated not null
*/
JapaneseDate(JapaneseEra era, int year, LocalDate isoDate) {
if (isoDate.isBefore(MIN_DATE)) {
throw new DateTimeException("Minimum supported date is January 1st Meiji 6");
}
this.era = era;
this.yearOfEra = year;
this.isoDate = isoDate;
}
/**
* Reconstitutes this object from a stream.
*
* @param stream object input stream
*/
private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
stream.defaultReadObject();
this.era = JapaneseEra.from(isoDate);
int yearOffset = this.era.startDate().getYear() - 1;
this.yearOfEra = isoDate.getYear() - yearOffset;
}
//-----------------------------------------------------------------------
@Override
public JapaneseChronology getChronology() {
return JapaneseChronology.INSTANCE;
}
@Override
public JapaneseEra getEra() {
return era;
}
@Override
public int lengthOfMonth() {
return isoDate.lengthOfMonth();
}
@Override
public int lengthOfYear() {
Calendar jcal = Calendar.getInstance(JapaneseChronology.LOCALE);
jcal.set(Calendar.ERA, era.getValue() + JapaneseEra.ERA_OFFSET);
jcal.set(yearOfEra, isoDate.getMonthValue() - 1, isoDate.getDayOfMonth());
return jcal.getActualMaximum(Calendar.DAY_OF_YEAR);
}
//-----------------------------------------------------------------------
/**
* Checks if the specified field is supported.
* <p>
* This checks if this date can be queried for the specified field.
* If false, then calling the {@link #range(TemporalField) range} and
* {@link #get(TemporalField) get} methods will throw an exception.
* <p>
* If the field is a {@link ChronoField} then the query is implemented here.
* The supported fields are:
* <ul>
* <li>{@code DAY_OF_WEEK}
* <li>{@code DAY_OF_MONTH}
* <li>{@code DAY_OF_YEAR}
* <li>{@code EPOCH_DAY}
* <li>{@code MONTH_OF_YEAR}
* <li>{@code PROLEPTIC_MONTH}
* <li>{@code YEAR_OF_ERA}
* <li>{@code YEAR}
* <li>{@code ERA}
* </ul>
* All other {@code ChronoField} instances will return false.
* <p>
* If the field is not a {@code ChronoField}, then the result of this method
* is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}
* passing {@code this} as the argument.
* Whether the field is supported is determined by the field.
*
* @param field the field to check, null returns false
* @return true if the field is supported on this date, false if not
*/
@Override
public boolean isSupported(TemporalField field) {
if (field == ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH ||
field == ChronoField.ALIGNED_DAY_OF_WEEK_IN_YEAR ||
field == ChronoField.ALIGNED_WEEK_OF_MONTH ||
field == ChronoField.ALIGNED_WEEK_OF_YEAR) {
return false;
}
return super.isSupported(field);
}
@Override
public ValueRange range(TemporalField field) {
if (field instanceof ChronoField) {
if (isSupported(field)) {
ChronoField f = (ChronoField) field;
switch (f) {
case DAY_OF_YEAR:
return actualRange(Calendar.DAY_OF_YEAR);
case YEAR_OF_ERA:
return actualRange(Calendar.YEAR);
}
return getChronology().range(f);
}
throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
}
return field.rangeRefinedBy(this);
}
private ValueRange actualRange(int calendarField) {
Calendar jcal = Calendar.getInstance(JapaneseChronology.LOCALE);
jcal.set(Calendar.ERA, era.getValue() + JapaneseEra.ERA_OFFSET);
jcal.set(yearOfEra, isoDate.getMonthValue() - 1, isoDate.getDayOfMonth());
return ValueRange.of(jcal.getActualMinimum(calendarField),
jcal.getActualMaximum(calendarField));
}
@Override
public long getLong(TemporalField field) {
if (field instanceof ChronoField) {
switch ((ChronoField) field) {
case ALIGNED_DAY_OF_WEEK_IN_MONTH:
case ALIGNED_DAY_OF_WEEK_IN_YEAR:
case ALIGNED_WEEK_OF_MONTH:
case ALIGNED_WEEK_OF_YEAR:
throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
case YEAR_OF_ERA:
return yearOfEra;
case ERA:
return era.getValue();
case DAY_OF_YEAR:
return getDayOfYear();
}
return isoDate.getLong(field);
}
return field.getFrom(this);
}
private long getDayOfYear() {
if (yearOfEra == 1) {
return isoDate.getDayOfYear() - era.startDate().getDayOfYear() + 1;
}
return isoDate.getDayOfYear();
}
//-----------------------------------------------------------------------
@Override
public JapaneseDate with(TemporalAdjuster adjuster) {
return (JapaneseDate) super.with(adjuster);
}
@Override
public JapaneseDate with(TemporalField field, long newValue) {
if (field instanceof ChronoField) {
ChronoField f = (ChronoField) field;
if (getLong(f) == newValue) { // validates unsupported fields
return this;
}
switch (f) {
case DAY_OF_YEAR:
case YEAR_OF_ERA:
case ERA: {
int nvalue = getChronology().range(f).checkValidIntValue(newValue, f);
switch (f) {
case DAY_OF_YEAR:
return with(isoDate.plusDays(nvalue - getDayOfYear()));
case YEAR_OF_ERA:
return this.withYear(nvalue);
case ERA: {
return this.withYear(JapaneseEra.of(nvalue), yearOfEra);
}
}
}
}
return with(isoDate.with(field, newValue));
}
return field.adjustInto(this, newValue);
}
@Override
public JapaneseDate plus(TemporalAmount amount) {
return (JapaneseDate) super.plus(amount);
}
@Override
public JapaneseDate plus(long amountToAdd, TemporalUnit unit) {
return (JapaneseDate) super.plus(amountToAdd, unit);
}
@Override
public JapaneseDate minus(TemporalAmount amount) {
return (JapaneseDate) super.minus(amount);
}
@Override
public JapaneseDate minus(long amountToAdd, TemporalUnit unit) {
return (JapaneseDate) super.minus(amountToAdd, unit);
}
//-----------------------------------------------------------------------
/**
* Returns a copy of this date with the year altered.
* <p>
* This method changes the year of the date.
* If the month-day is invalid for the year, then the previous valid day
* will be selected instead.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param era the era to set in the result, not null
* @param yearOfEra the year-of-era to set in the returned date
* @return a {@code JapaneseDate} based on this date with the requested year, never null
* @throws DateTimeException if {@code year} is invalid
*/
private JapaneseDate withYear(JapaneseEra era, int yearOfEra) {
int year = JapaneseChronology.INSTANCE.prolepticYear(era, yearOfEra);
return with(isoDate.withYear(year));
}
/**
* Returns a copy of this date with the year-of-era altered.
* <p>
* This method changes the year-of-era of the date.
* If the month-day is invalid for the year, then the previous valid day
* will be selected instead.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param year the year to set in the returned date
* @return a {@code JapaneseDate} based on this date with the requested year-of-era, never null
* @throws DateTimeException if {@code year} is invalid
*/
private JapaneseDate withYear(int year) {
return withYear(getEra(), year);
}
//-----------------------------------------------------------------------
@Override
JapaneseDate plusYears(long years) {
return with(isoDate.plusYears(years));
}
@Override
JapaneseDate plusMonths(long months) {
return with(isoDate.plusMonths(months));
}
@Override
JapaneseDate plusDays(long days) {
return with(isoDate.plusDays(days));
}
private JapaneseDate with(LocalDate newDate) {
return (newDate.equals(isoDate) ? this : new JapaneseDate(newDate));
}
@Override
@SuppressWarnings("unchecked")
public final ChronoLocalDateTime<JapaneseDate> atTime(LocalTime localTime) {
return (ChronoLocalDateTime<JapaneseDate>)super.atTime(localTime);
}
@Override
public ChronoPeriod until(ChronoLocalDate endDate) {
Period period = isoDate.until(endDate);
return getChronology().period(period.getYears(), period.getMonths(), period.getDays());
}
@Override // override for performance
public long toEpochDay() {
return isoDate.toEpochDay();
}
//-------------------------------------------------------------------------
@Override // override for performance
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof JapaneseDate) {
JapaneseDate otherDate = (JapaneseDate) obj;
return this.isoDate.equals(otherDate.isoDate);
}
return false;
}
@Override // override for performance
public int hashCode() {
return getChronology().getId().hashCode() ^ isoDate.hashCode();
}
//-----------------------------------------------------------------------
private Object writeReplace() {
return new Ser(Ser.JAPANESE_DATE_TYPE, this);
}
void writeExternal(DataOutput out) throws IOException {
// JapaneseChrono is implicit in the JAPANESE_DATE_TYPE
out.writeInt(get(YEAR));
out.writeByte(get(MONTH_OF_YEAR));
out.writeByte(get(DAY_OF_MONTH));
}
static ChronoLocalDate readExternal(DataInput in) throws IOException {
int year = in.readInt();
int month = in.readByte();
int dayOfMonth = in.readByte();
return JapaneseChronology.INSTANCE.date(year, month, dayOfMonth);
}
}