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	/*
	* Copyright (c) 2012, 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.
	*/

	/*
	* 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.IOException;
	import java.io.InvalidObjectException;
	import java.io.ObjectInput;
	import java.io.ObjectInputStream;
	import java.io.ObjectOutput;
	import java.io.Serializable;
	import java.time.Clock;
	import java.time.DateTimeException;
	import java.time.LocalDate;
	import java.time.LocalTime;
	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;

	/**
	* A date in the Hijrah calendar system.
	* <p>
	* This date operates using one of several variants of the
	* {@linkplain HijrahChronology Hijrah calendar}.
	* <p>
	* The Hijrah calendar has a different total of days in a year than
	* Gregorian calendar, and the length of each month is based on the period
	* of a complete revolution of the moon around the earth
	* (as between successive new moons).
	* Refer to the {@link HijrahChronology} for details of supported variants.
	* <p>
	* Each HijrahDate is created bound to a particular HijrahChronology,
	* The same chronology is propagated to each HijrahDate computed from the date.
	* To use a different Hijrah variant, its HijrahChronology can be used
	* to create new HijrahDate instances.
	* Alternatively, the {@link #withVariant} method can be used to convert
	* to a new HijrahChronology.
	*
	* <p>
	* This is a <a href="{@docRoot}/java.base/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 HijrahDate} 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 HijrahDate
	extends ChronoLocalDateImpl<HijrahDate>
	implements ChronoLocalDate, Serializable {

	/**
	* Serialization version.
	*/
	private static final long serialVersionUID = -5207853542612002020L;
	/**
	* The Chronology of this HijrahDate.
	*/
	private final transient HijrahChronology chrono;
	/**
	* The proleptic year.
	*/
	private final transient int prolepticYear;
	/**
	* The month-of-year.
	*/
	private final transient int monthOfYear;
	/**
	* The day-of-month.
	*/
	private final transient int dayOfMonth;

	//-------------------------------------------------------------------------
	/**
	* Obtains an instance of {@code HijrahDate} from the Hijrah proleptic year,
	* month-of-year and day-of-month.
	*
	* @param prolepticYear the proleptic year to represent in the Hijrah calendar
	* @param monthOfYear the month-of-year to represent, from 1 to 12
	* @param dayOfMonth the day-of-month to represent, from 1 to 30
	* @return the Hijrah date, never null
	* @throws DateTimeException if the value of any field is out of range
	*/
	static HijrahDate of(HijrahChronology chrono, int prolepticYear, int monthOfYear, int dayOfMonth) {
	return new HijrahDate(chrono, prolepticYear, monthOfYear, dayOfMonth);
	}

	/**
	* Returns a HijrahDate for the chronology and epochDay.
	* @param chrono The Hijrah chronology
	* @param epochDay the epoch day
	* @return a HijrahDate for the epoch day; non-null
	*/
	static HijrahDate ofEpochDay(HijrahChronology chrono, long epochDay) {
	return new HijrahDate(chrono, epochDay);
	}

	//-----------------------------------------------------------------------
	/**
	* Obtains the current {@code HijrahDate} of the Islamic Umm Al-Qura calendar
	* 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 HijrahDate now() {
	return now(Clock.systemDefaultZone());
	}

	/**
	* Obtains the current {@code HijrahDate} of the Islamic Umm Al-Qura calendar
	* 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 HijrahDate now(ZoneId zone) {
	return now(Clock.system(zone));
	}

	/**
	* Obtains the current {@code HijrahDate} of the Islamic Umm Al-Qura calendar
	* 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 HijrahDate now(Clock clock) {
	return HijrahDate.ofEpochDay(HijrahChronology.INSTANCE, LocalDate.now(clock).toEpochDay());
	}

	/**
	* Obtains a {@code HijrahDate} of the Islamic Umm Al-Qura calendar
	* from the proleptic-year, month-of-year and day-of-month fields.
	* <p>
	* This returns a {@code HijrahDate} with the specified fields.
	* The day must be valid for the year and month, otherwise an exception will be thrown.
	*
	* @param prolepticYear the Hijrah proleptic-year
	* @param month the Hijrah month-of-year, from 1 to 12
	* @param dayOfMonth the Hijrah day-of-month, from 1 to 30
	* @return the date in Hijrah 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 HijrahDate of(int prolepticYear, int month, int dayOfMonth) {
	return HijrahChronology.INSTANCE.date(prolepticYear, month, dayOfMonth);
	}

	/**
	* Obtains a {@code HijrahDate} of the Islamic Umm Al-Qura calendar from a temporal object.
	* <p>
	* This obtains a date in the Hijrah 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 HijrahDate}.
	* <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 HijrahDate::from}.
	*
	* @param temporal the temporal object to convert, not null
	* @return the date in Hijrah calendar system, not null
	* @throws DateTimeException if unable to convert to a {@code HijrahDate}
	*/
	public static HijrahDate from(TemporalAccessor temporal) {
	return HijrahChronology.INSTANCE.date(temporal);
	}

	//-----------------------------------------------------------------------
	/**
	* Constructs an {@code HijrahDate} with the proleptic-year, month-of-year and
	* day-of-month fields.
	*
	* @param chrono The chronology to create the date with
	* @param prolepticYear the proleptic year
	* @param monthOfYear the month of year
	* @param dayOfMonth the day of month
	*/
	private HijrahDate(HijrahChronology chrono, int prolepticYear, int monthOfYear, int dayOfMonth) {
	// Computing the Gregorian day checks the valid ranges
	chrono.getEpochDay(prolepticYear, monthOfYear, dayOfMonth);

	this.chrono = chrono;
	this.prolepticYear = prolepticYear;
	this.monthOfYear = monthOfYear;
	this.dayOfMonth = dayOfMonth;
	}

	/**
	* Constructs an instance with the Epoch Day.
	*
	* @param epochDay the epochDay
	*/
	private HijrahDate(HijrahChronology chrono, long epochDay) {
	int[] dateInfo = chrono.getHijrahDateInfo((int)epochDay);

	this.chrono = chrono;
	this.prolepticYear = dateInfo[0];
	this.monthOfYear = dateInfo[1];
	this.dayOfMonth = dateInfo[2];
	}

	//-----------------------------------------------------------------------
	/**
	* Gets the chronology of this date, which is the Hijrah 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 Hijrah chronology, not null
	*/
	@Override
	public HijrahChronology getChronology() {
	return chrono;
	}

	/**
	* Gets the era applicable at this date.
	* <p>
	* The Hijrah calendar system has one era, 'AH',
	* defined by {@link HijrahEra}.
	*
	* @return the era applicable at this date, not null
	*/
	@Override
	public HijrahEra getEra() {
	return HijrahEra.AH;
	}

	/**
	* Returns the length of the month represented by this date.
	* <p>
	* This returns the length of the month in days.
	* Month lengths in the Hijrah calendar system vary between 29 and 30 days.
	*
	* @return the length of the month in days
	*/
	@Override
	public int lengthOfMonth() {
	return chrono.getMonthLength(prolepticYear, monthOfYear);
	}

	/**
	* Returns the length of the year represented by this date.
	* <p>
	* This returns the length of the year in days.
	* A Hijrah calendar system year is typically shorter than
	* that of the ISO calendar system.
	*
	* @return the length of the year in days
	*/
	@Override
	public int lengthOfYear() {
	return chrono.getYearLength(prolepticYear);
	}

	//-----------------------------------------------------------------------
	@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 ALIGNED_WEEK_OF_MONTH: return ValueRange.of(1, 5); // TODO
	// TODO does the limited range of valid years cause years to
	// start/end part way through? that would affect range
	}
	return getChronology().range(f);
	}
	throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
	}
	return field.rangeRefinedBy(this);
	}

	@Override
	public long getLong(TemporalField field) {
	if (field instanceof ChronoField) {
	switch ((ChronoField) field) {
	case DAY_OF_WEEK: return getDayOfWeek();
	case ALIGNED_DAY_OF_WEEK_IN_MONTH: return ((dayOfMonth - 1) % 7) + 1;
	case ALIGNED_DAY_OF_WEEK_IN_YEAR: return ((getDayOfYear() - 1) % 7) + 1;
	case DAY_OF_MONTH: return this.dayOfMonth;
	case DAY_OF_YEAR: return this.getDayOfYear();
	case EPOCH_DAY: return toEpochDay();
	case ALIGNED_WEEK_OF_MONTH: return ((dayOfMonth - 1) / 7) + 1;
	case ALIGNED_WEEK_OF_YEAR: return ((getDayOfYear() - 1) / 7) + 1;
	case MONTH_OF_YEAR: return monthOfYear;
	case PROLEPTIC_MONTH: return getProlepticMonth();
	case YEAR_OF_ERA: return prolepticYear;
	case YEAR: return prolepticYear;
	case ERA: return getEraValue();
	}
	throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
	}
	return field.getFrom(this);
	}

	private long getProlepticMonth() {
	return prolepticYear * 12L + monthOfYear - 1;
	}

	@Override
	public HijrahDate with(TemporalField field, long newValue) {
	if (field instanceof ChronoField) {
	ChronoField f = (ChronoField) field;
	// not using checkValidIntValue so EPOCH_DAY and PROLEPTIC_MONTH work
	chrono.range(f).checkValidValue(newValue, f); // TODO: validate value
	int nvalue = (int) newValue;
	switch (f) {
	case DAY_OF_WEEK: return plusDays(newValue - getDayOfWeek());
	case ALIGNED_DAY_OF_WEEK_IN_MONTH: return plusDays(newValue - getLong(ALIGNED_DAY_OF_WEEK_IN_MONTH));
	case ALIGNED_DAY_OF_WEEK_IN_YEAR: return plusDays(newValue - getLong(ALIGNED_DAY_OF_WEEK_IN_YEAR));
	case DAY_OF_MONTH: return resolvePreviousValid(prolepticYear, monthOfYear, nvalue);
	case DAY_OF_YEAR: return plusDays(Math.min(nvalue, lengthOfYear()) - getDayOfYear());
	case EPOCH_DAY: return new HijrahDate(chrono, newValue);
	case ALIGNED_WEEK_OF_MONTH: return plusDays((newValue - getLong(ALIGNED_WEEK_OF_MONTH)) * 7);
	case ALIGNED_WEEK_OF_YEAR: return plusDays((newValue - getLong(ALIGNED_WEEK_OF_YEAR)) * 7);
	case MONTH_OF_YEAR: return resolvePreviousValid(prolepticYear, nvalue, dayOfMonth);
	case PROLEPTIC_MONTH: return plusMonths(newValue - getProlepticMonth());
	case YEAR_OF_ERA: return resolvePreviousValid(prolepticYear >= 1 ? nvalue : 1 - nvalue, monthOfYear, dayOfMonth);
	case YEAR: return resolvePreviousValid(nvalue, monthOfYear, dayOfMonth);
	case ERA: return resolvePreviousValid(1 - prolepticYear, monthOfYear, dayOfMonth);
	}
	throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
	}
	return super.with(field, newValue);
	}

	private HijrahDate resolvePreviousValid(int prolepticYear, int month, int day) {
	int monthDays = chrono.getMonthLength(prolepticYear, month);
	if (day > monthDays) {
	day = monthDays;
	}
	return HijrahDate.of(chrono, prolepticYear, month, day);
	}

	/**
	* {@inheritDoc}
	* @throws DateTimeException if unable to make the adjustment.
	* For example, if the adjuster requires an ISO chronology
	* @throws ArithmeticException {@inheritDoc}
	*/
	@Override
	public HijrahDate with(TemporalAdjuster adjuster) {
	return super.with(adjuster);
	}

	/**
	* Returns a {@code HijrahDate} with the Chronology requested.
	* <p>
	* The year, month, and day are checked against the new requested
	* HijrahChronology. If the chronology has a shorter month length
	* for the month, the day is reduced to be the last day of the month.
	*
	* @param chronology the new HijrahChonology, non-null
	* @return a HijrahDate with the requested HijrahChronology, non-null
	*/
	public HijrahDate withVariant(HijrahChronology chronology) {
	if (chrono == chronology) {
	return this;
	}
	// Like resolvePreviousValid the day is constrained to stay in the same month
	int monthDays = chronology.getDayOfYear(prolepticYear, monthOfYear);
	return HijrahDate.of(chronology, prolepticYear, monthOfYear,(dayOfMonth > monthDays) ? monthDays : dayOfMonth );
	}

	/**
	* {@inheritDoc}
	* @throws DateTimeException {@inheritDoc}
	* @throws ArithmeticException {@inheritDoc}
	*/
	@Override
	public HijrahDate plus(TemporalAmount amount) {
	return super.plus(amount);
	}

	/**
	* {@inheritDoc}
	* @throws DateTimeException {@inheritDoc}
	* @throws ArithmeticException {@inheritDoc}
	*/
	@Override
	public HijrahDate minus(TemporalAmount amount) {
	return super.minus(amount);
	}

	@Override
	public long toEpochDay() {
	return chrono.getEpochDay(prolepticYear, monthOfYear, dayOfMonth);
	}

	/**
	* Gets the day-of-year field.
	* <p>
	* This method returns the primitive {@code int} value for the day-of-year.
	*
	* @return the day-of-year
	*/
	private int getDayOfYear() {
	return chrono.getDayOfYear(prolepticYear, monthOfYear) + dayOfMonth;
	}

	/**
	* Gets the day-of-week value.
	*
	* @return the day-of-week; computed from the epochday
	*/
	private int getDayOfWeek() {
	int dow0 = Math.floorMod(toEpochDay() + 3, 7);
	return dow0 + 1;
	}

	/**
	* Gets the Era of this date.
	*
	* @return the Era of this date; computed from epochDay
	*/
	private int getEraValue() {
	return (prolepticYear > 1 ? 1 : 0);
	}

	//-----------------------------------------------------------------------
	/**
	* Checks if the year is a leap year, according to the Hijrah calendar system rules.
	*
	* @return true if this date is in a leap year
	*/
	@Override
	public boolean isLeapYear() {
	return chrono.isLeapYear(prolepticYear);
	}

	//-----------------------------------------------------------------------
	@Override
	HijrahDate plusYears(long years) {
	if (years == 0) {
	return this;
	}
	int newYear = Math.addExact(this.prolepticYear, (int)years);
	return resolvePreviousValid(newYear, monthOfYear, dayOfMonth);
	}

	@Override
	HijrahDate plusMonths(long monthsToAdd) {
	if (monthsToAdd == 0) {
	return this;
	}
	long monthCount = prolepticYear * 12L + (monthOfYear - 1);
	long calcMonths = monthCount + monthsToAdd; // safe overflow
	int newYear = chrono.checkValidYear(Math.floorDiv(calcMonths, 12L));
	int newMonth = (int)Math.floorMod(calcMonths, 12L) + 1;
	return resolvePreviousValid(newYear, newMonth, dayOfMonth);
	}

	@Override
	HijrahDate plusWeeks(long weeksToAdd) {
	return super.plusWeeks(weeksToAdd);
	}

	@Override
	HijrahDate plusDays(long days) {
	return new HijrahDate(chrono, toEpochDay() + days);
	}

	@Override
	public HijrahDate plus(long amountToAdd, TemporalUnit unit) {
	return super.plus(amountToAdd, unit);
	}

	@Override
	public HijrahDate minus(long amountToSubtract, TemporalUnit unit) {
	return super.minus(amountToSubtract, unit);
	}

	@Override
	HijrahDate minusYears(long yearsToSubtract) {
	return super.minusYears(yearsToSubtract);
	}

	@Override
	HijrahDate minusMonths(long monthsToSubtract) {
	return super.minusMonths(monthsToSubtract);
	}

	@Override
	HijrahDate minusWeeks(long weeksToSubtract) {
	return super.minusWeeks(weeksToSubtract);
	}

	@Override
	HijrahDate minusDays(long daysToSubtract) {
	return super.minusDays(daysToSubtract);
	}

	@Override // for javadoc and covariant return type
	@SuppressWarnings("unchecked")
	public final ChronoLocalDateTime<HijrahDate> atTime(LocalTime localTime) {
	return (ChronoLocalDateTime<HijrahDate>)super.atTime(localTime);
	}

	@Override
	public ChronoPeriod until(ChronoLocalDate endDate) {
	// TODO: untested
	HijrahDate end = getChronology().date(endDate);
	long totalMonths = (end.prolepticYear - this.prolepticYear) * 12 + (end.monthOfYear - this.monthOfYear); // safe
	int days = end.dayOfMonth - this.dayOfMonth;
	if (totalMonths > 0 && days < 0) {
	totalMonths--;
	HijrahDate calcDate = this.plusMonths(totalMonths);
	days = (int) (end.toEpochDay() - calcDate.toEpochDay()); // safe
	} else if (totalMonths < 0 && days > 0) {
	totalMonths++;
	days -= end.lengthOfMonth();
	}
	long years = totalMonths / 12; // safe
	int months = (int) (totalMonths % 12); // safe
	return getChronology().period(Math.toIntExact(years), months, days);
	}

	//-------------------------------------------------------------------------
	/**
	* Compares this date to another date, including the chronology.
	* <p>
	* Compares this {@code HijrahDate} with another ensuring that the date is the same.
	* <p>
	* Only objects of type {@code HijrahDate} 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 and the Chronologies are equal
	*/
	@Override // override for performance
	public boolean equals(Object obj) {
	if (this == obj) {
	return true;
	}
	if (obj instanceof HijrahDate) {
	HijrahDate otherDate = (HijrahDate) obj;
	return prolepticYear == otherDate.prolepticYear
	&& this.monthOfYear == otherDate.monthOfYear
	&& this.dayOfMonth == otherDate.dayOfMonth
	&& getChronology().equals(otherDate.getChronology());
	}
	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() {
	int yearValue = prolepticYear;
	int monthValue = monthOfYear;
	int dayValue = dayOfMonth;
	return getChronology().getId().hashCode() ^ (yearValue & 0xFFFFF800)
	^ ((yearValue << 11) + (monthValue << 6) + (dayValue));
	}

	//-----------------------------------------------------------------------
	/**
	* 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(6); // identifies a HijrahDate
	* out.writeObject(chrono); // the HijrahChronology variant
	* 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.HIJRAH_DATE_TYPE, this);
	}

	void writeExternal(ObjectOutput out) throws IOException {
	// HijrahChronology is implicit in the Hijrah_DATE_TYPE
	out.writeObject(getChronology());
	out.writeInt(get(YEAR));
	out.writeByte(get(MONTH_OF_YEAR));
	out.writeByte(get(DAY_OF_MONTH));
	}

	static HijrahDate readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
	HijrahChronology chrono = (HijrahChronology) in.readObject();
	int year = in.readInt();
	int month = in.readByte();
	int dayOfMonth = in.readByte();
	return chrono.date(year, month, dayOfMonth);
	}

	}

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