--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.base/share/classes/java/time/chrono/JapaneseDate.java Sun Aug 17 15:54:13 2014 +0100
@@ -0,0 +1,757 @@
+/*
+ * Copyright (c) 2012, 2013, 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.
+ */
+
+/*
+ * Copyright (c) 2012, 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
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package java.time.chrono;
+
+import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH;
+import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_YEAR;
+import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_MONTH;
+import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_YEAR;
+import static java.time.temporal.ChronoField.DAY_OF_MONTH;
+import static java.time.temporal.ChronoField.MONTH_OF_YEAR;
+import static java.time.temporal.ChronoField.YEAR;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import java.io.InvalidObjectException;
+import java.io.ObjectInputStream;
+import java.io.Serializable;
+import java.time.Clock;
+import java.time.DateTimeException;
+import java.time.LocalDate;
+import java.time.LocalTime;
+import java.time.Period;
+import java.time.ZoneId;
+import java.time.temporal.ChronoField;
+import java.time.temporal.TemporalAccessor;
+import java.time.temporal.TemporalAdjuster;
+import java.time.temporal.TemporalAmount;
+import java.time.temporal.TemporalField;
+import java.time.temporal.TemporalQuery;
+import java.time.temporal.TemporalUnit;
+import java.time.temporal.UnsupportedTemporalTypeException;
+import java.time.temporal.ValueRange;
+import java.util.Calendar;
+import java.util.Objects;
+
+import sun.util.calendar.CalendarDate;
+import sun.util.calendar.LocalGregorianCalendar;
+
+/**
+ * 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;
+ * dates before Meiji 6, January 1 are not 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 JapaneseChronology.ERA_HEISEI}.<br>
+ *
+ * <p>
+ * This is a <a href="{@docRoot}/java/lang/doc-files/ValueBased.html">value-based</a>
+ * class; use of identity-sensitive operations (including reference equality
+ * ({@code ==}), identity hash code, or synchronization) on instances of
+ * {@code JapaneseDate} may have unpredictable results and should be avoided.
+ * The {@code equals} method should be used for comparisons.
+ *
+ * @implSpec
+ * This class is immutable and thread-safe.
+ *
+ * @since 1.8
+ */
+public final class JapaneseDate
+ extends ChronoLocalDateImpl<JapaneseDate>
+ implements ChronoLocalDate, Serializable {
+
+ /**
+ * Serialization version.
+ */
+ private static final long serialVersionUID = -305327627230580483L;
+
+ /**
+ * The underlying ISO local date.
+ */
+ private final transient LocalDate isoDate;
+ /**
+ * The JapaneseEra of this date.
+ */
+ private transient JapaneseEra era;
+ /**
+ * The Japanese imperial calendar year of this date.
+ */
+ private transient int yearOfEra;
+
+ /**
+ * The first day supported by the JapaneseChronology is Meiji 6, January 1st.
+ */
+ static final LocalDate MEIJI_6_ISODATE = LocalDate.of(1873, 1, 1);
+
+ //-----------------------------------------------------------------------
+ /**
+ * 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,
+ * or if the date is not a Japanese era
+ */
+ public static JapaneseDate of(JapaneseEra era, int yearOfEra, int month, int dayOfMonth) {
+ Objects.requireNonNull(era, "era");
+ LocalGregorianCalendar.Date jdate = JapaneseChronology.JCAL.newCalendarDate(null);
+ jdate.setEra(era.getPrivateEra()).setDate(yearOfEra, month, dayOfMonth);
+ if (!JapaneseChronology.JCAL.validate(jdate)) {
+ throw new DateTimeException("year, month, and day not valid for Era");
+ }
+ LocalDate date = LocalDate.of(jdate.getNormalizedYear(), month, dayOfMonth);
+ return new JapaneseDate(era, yearOfEra, date);
+ }
+
+ /**
+ * 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} 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.
+ * <p>
+ * The day-of-year in this factory is expressed relative to the start of the year-of-era.
+ * This definition changes the normal meaning of day-of-year only in those years
+ * where the year-of-era is reset to one due to a change in the era.
+ * For example:
+ * <pre>
+ * 6th Jan Showa 64 = day-of-year 6
+ * 7th Jan Showa 64 = day-of-year 7
+ * 8th Jan Heisei 1 = day-of-year 1
+ * 9th Jan Heisei 1 = day-of-year 2
+ * </pre>
+ *
+ * @param era the Japanese era, not null
+ * @param yearOfEra the Japanese year-of-era
+ * @param dayOfYear the chronology day-of-year, from 1 to 366
+ * @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) {
+ Objects.requireNonNull(era, "era");
+ CalendarDate firstDay = era.getPrivateEra().getSinceDate();
+ LocalGregorianCalendar.Date jdate = JapaneseChronology.JCAL.newCalendarDate(null);
+ jdate.setEra(era.getPrivateEra());
+ if (yearOfEra == 1) {
+ jdate.setDate(yearOfEra, firstDay.getMonth(), firstDay.getDayOfMonth() + dayOfYear - 1);
+ } else {
+ jdate.setDate(yearOfEra, 1, dayOfYear);
+ }
+ JapaneseChronology.JCAL.normalize(jdate);
+ if (era.getPrivateEra() != jdate.getEra() || yearOfEra != jdate.getYear()) {
+ throw new DateTimeException("Invalid parameters");
+ }
+ LocalDate localdate = LocalDate.of(jdate.getNormalizedYear(),
+ jdate.getMonth(), jdate.getDayOfMonth());
+ return new JapaneseDate(era, yearOfEra, localdate);
+ }
+
+ /**
+ * 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(MEIJI_6_ISODATE)) {
+ throw new DateTimeException("JapaneseDate before Meiji 6 is not supported");
+ }
+ LocalGregorianCalendar.Date jdate = toPrivateJapaneseDate(isoDate);
+ this.era = JapaneseEra.toJapaneseEra(jdate.getEra());
+ this.yearOfEra = jdate.getYear();
+ 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(MEIJI_6_ISODATE)) {
+ throw new DateTimeException("JapaneseDate before Meiji 6 is not supported");
+ }
+ this.era = era;
+ this.yearOfEra = year;
+ this.isoDate = isoDate;
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Gets the chronology of this date, which is the Japanese calendar system.
+ * <p>
+ * The {@code Chronology} represents the calendar system in use.
+ * The era and other fields in {@link ChronoField} are defined by the chronology.
+ *
+ * @return the Japanese chronology, not null
+ */
+ @Override
+ public JapaneseChronology getChronology() {
+ return JapaneseChronology.INSTANCE;
+ }
+
+ /**
+ * Gets the era applicable at this date.
+ * <p>
+ * The Japanese calendar system has multiple eras defined by {@link JapaneseEra}.
+ *
+ * @return the era applicable at this date, not null
+ */
+ @Override
+ public JapaneseEra getEra() {
+ return era;
+ }
+
+ /**
+ * Returns the length of the month represented by this date.
+ * <p>
+ * This returns the length of the month in days.
+ * Month lengths match those of the ISO calendar system.
+ *
+ * @return the length of the month in days
+ */
+ @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 == ALIGNED_DAY_OF_WEEK_IN_MONTH || field == ALIGNED_DAY_OF_WEEK_IN_YEAR ||
+ field == ALIGNED_WEEK_OF_MONTH || field == ALIGNED_WEEK_OF_YEAR) {
+ return false;
+ }
+ return ChronoLocalDate.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_MONTH: return ValueRange.of(1, lengthOfMonth());
+ case DAY_OF_YEAR: return ValueRange.of(1, lengthOfYear());
+ case YEAR_OF_ERA: {
+ 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(1, jcal.getActualMaximum(Calendar.YEAR));
+ }
+ }
+ return getChronology().range(f);
+ }
+ throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
+ }
+ return field.rangeRefinedBy(this);
+ }
+
+ @Override
+ public long getLong(TemporalField field) {
+ if (field instanceof ChronoField) {
+ // same as ISO:
+ // DAY_OF_WEEK, DAY_OF_MONTH, EPOCH_DAY, MONTH_OF_YEAR, PROLEPTIC_MONTH, YEAR
+ //
+ // calendar specific fields
+ // DAY_OF_YEAR, YEAR_OF_ERA, ERA
+ 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:
+ 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.get(Calendar.DAY_OF_YEAR);
+ }
+ return isoDate.getLong(field);
+ }
+ return field.getFrom(this);
+ }
+
+ /**
+ * Returns a {@code LocalGregorianCalendar.Date} converted from the given {@code isoDate}.
+ *
+ * @param isoDate the local date, not null
+ * @return a {@code LocalGregorianCalendar.Date}, not null
+ */
+ private static LocalGregorianCalendar.Date toPrivateJapaneseDate(LocalDate isoDate) {
+ LocalGregorianCalendar.Date jdate = JapaneseChronology.JCAL.newCalendarDate(null);
+ sun.util.calendar.Era sunEra = JapaneseEra.privateEraFrom(isoDate);
+ int year = isoDate.getYear();
+ if (sunEra != null) {
+ year -= sunEra.getSinceDate().getYear() - 1;
+ }
+ jdate.setEra(sunEra).setYear(year).setMonth(isoDate.getMonthValue()).setDayOfMonth(isoDate.getDayOfMonth());
+ JapaneseChronology.JCAL.normalize(jdate);
+ return jdate;
+ }
+
+ //-----------------------------------------------------------------------
+ @Override
+ public JapaneseDate with(TemporalField field, long newValue) {
+ if (field instanceof ChronoField) {
+ ChronoField f = (ChronoField) field;
+ if (getLong(f) == newValue) { // getLong() validates for supported fields
+ return this;
+ }
+ switch (f) {
+ case YEAR_OF_ERA:
+ case YEAR:
+ case ERA: {
+ int nvalue = getChronology().range(f).checkValidIntValue(newValue, f);
+ switch (f) {
+ case YEAR_OF_ERA:
+ return this.withYear(nvalue);
+ case YEAR:
+ return with(isoDate.withYear(nvalue));
+ case ERA: {
+ return this.withYear(JapaneseEra.of(nvalue), yearOfEra);
+ }
+ }
+ }
+ }
+ // YEAR, PROLEPTIC_MONTH and others are same as ISO
+ return with(isoDate.with(field, newValue));
+ }
+ return super.with(field, newValue);
+ }
+
+ /**
+ * {@inheritDoc}
+ * @throws DateTimeException {@inheritDoc}
+ * @throws ArithmeticException {@inheritDoc}
+ */
+ @Override
+ public JapaneseDate with(TemporalAdjuster adjuster) {
+ return super.with(adjuster);
+ }
+
+ /**
+ * {@inheritDoc}
+ * @throws DateTimeException {@inheritDoc}
+ * @throws ArithmeticException {@inheritDoc}
+ */
+ @Override
+ public JapaneseDate plus(TemporalAmount amount) {
+ return super.plus(amount);
+ }
+
+ /**
+ * {@inheritDoc}
+ * @throws DateTimeException {@inheritDoc}
+ * @throws ArithmeticException {@inheritDoc}
+ */
+ @Override
+ public JapaneseDate minus(TemporalAmount amount) {
+ return super.minus(amount);
+ }
+ //-----------------------------------------------------------------------
+ /**
+ * 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 plusWeeks(long weeksToAdd) {
+ return with(isoDate.plusWeeks(weeksToAdd));
+ }
+
+ @Override
+ JapaneseDate plusDays(long days) {
+ return with(isoDate.plusDays(days));
+ }
+
+ @Override
+ public JapaneseDate plus(long amountToAdd, TemporalUnit unit) {
+ return super.plus(amountToAdd, unit);
+ }
+
+ @Override
+ public JapaneseDate minus(long amountToAdd, TemporalUnit unit) {
+ return super.minus(amountToAdd, unit);
+ }
+
+ @Override
+ JapaneseDate minusYears(long yearsToSubtract) {
+ return super.minusYears(yearsToSubtract);
+ }
+
+ @Override
+ JapaneseDate minusMonths(long monthsToSubtract) {
+ return super.minusMonths(monthsToSubtract);
+ }
+
+ @Override
+ JapaneseDate minusWeeks(long weeksToSubtract) {
+ return super.minusWeeks(weeksToSubtract);
+ }
+
+ @Override
+ JapaneseDate minusDays(long daysToSubtract) {
+ return super.minusDays(daysToSubtract);
+ }
+
+ private JapaneseDate with(LocalDate newDate) {
+ return (newDate.equals(isoDate) ? this : new JapaneseDate(newDate));
+ }
+
+ @Override // for javadoc and covariant return type
+ @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();
+ }
+
+ //-------------------------------------------------------------------------
+ /**
+ * Compares this date to another date, including the chronology.
+ * <p>
+ * Compares this {@code JapaneseDate} with another ensuring that the date is the same.
+ * <p>
+ * Only objects of type {@code JapaneseDate} are compared, other types return false.
+ * To compare the dates of two {@code TemporalAccessor} instances, including dates
+ * in two different chronologies, use {@link ChronoField#EPOCH_DAY} as a comparator.
+ *
+ * @param obj the object to check, null returns false
+ * @return true if this is equal to the other date
+ */
+ @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;
+ }
+
+ /**
+ * A hash code for this date.
+ *
+ * @return a suitable hash code based only on the Chronology and the date
+ */
+ @Override // override for performance
+ public int hashCode() {
+ return getChronology().getId().hashCode() ^ isoDate.hashCode();
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Defend against malicious streams.
+ *
+ * @param s the stream to read
+ * @throws InvalidObjectException always
+ */
+ private void readObject(ObjectInputStream s) throws InvalidObjectException {
+ throw new InvalidObjectException("Deserialization via serialization delegate");
+ }
+
+ /**
+ * Writes the object using a
+ * <a href="../../../serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>.
+ * @serialData
+ * <pre>
+ * out.writeByte(4); // identifies a JapaneseDate
+ * out.writeInt(get(YEAR));
+ * out.writeByte(get(MONTH_OF_YEAR));
+ * out.writeByte(get(DAY_OF_MONTH));
+ * </pre>
+ *
+ * @return the instance of {@code Ser}, not null
+ */
+ private Object writeReplace() {
+ return new Ser(Ser.JAPANESE_DATE_TYPE, this);
+ }
+
+ void writeExternal(DataOutput out) throws IOException {
+ // JapaneseChronology is implicit in the JAPANESE_DATE_TYPE
+ out.writeInt(get(YEAR));
+ out.writeByte(get(MONTH_OF_YEAR));
+ out.writeByte(get(DAY_OF_MONTH));
+ }
+
+ static JapaneseDate readExternal(DataInput in) throws IOException {
+ int year = in.readInt();
+ int month = in.readByte();
+ int dayOfMonth = in.readByte();
+ return JapaneseChronology.INSTANCE.date(year, month, dayOfMonth);
+ }
+
+}