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	/*
	* Copyright (c) 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) 2013, 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.MONTH_OF_YEAR;
	import static java.time.temporal.ChronoUnit.DAYS;
	import static java.time.temporal.ChronoUnit.MONTHS;
	import static java.time.temporal.ChronoUnit.YEARS;

	import java.io.DataInput;
	import java.io.DataOutput;
	import java.io.IOException;
	import java.io.InvalidObjectException;
	import java.io.ObjectInputStream;
	import java.io.ObjectStreamException;
	import java.io.Serializable;
	import java.time.DateTimeException;
	import java.time.temporal.ChronoUnit;
	import java.time.temporal.Temporal;
	import java.time.temporal.TemporalAccessor;
	import java.time.temporal.TemporalAmount;
	import java.time.temporal.TemporalQueries;
	import java.time.temporal.TemporalUnit;
	import java.time.temporal.UnsupportedTemporalTypeException;
	import java.time.temporal.ValueRange;
	import java.util.Arrays;
	import java.util.Collections;
	import java.util.List;
	import java.util.Objects;

	/**
	* A period expressed in terms of a standard year-month-day calendar system.
	* <p>
	* This class is used by applications seeking to handle dates in non-ISO calendar systems.
	* For example, the Japanese, Minguo, Thai Buddhist and others.
	*
	* @implSpec
	* This class is immutable nad thread-safe.
	*
	* @since 1.8
	*/
	final class ChronoPeriodImpl
	implements ChronoPeriod, Serializable {
	// this class is only used by JDK chronology implementations and makes assumptions based on that fact

	/**
	* Serialization version.
	*/
	private static final long serialVersionUID = 57387258289L;

	/**
	* The set of supported units.
	*/
	private static final List<TemporalUnit> SUPPORTED_UNITS =
	Collections.unmodifiableList(Arrays.<TemporalUnit>asList(YEARS, MONTHS, DAYS));

	/**
	* The chronology.
	*/
	private final Chronology chrono;
	/**
	* The number of years.
	*/
	final int years;
	/**
	* The number of months.
	*/
	final int months;
	/**
	* The number of days.
	*/
	final int days;

	/**
	* Creates an instance.
	*/
	ChronoPeriodImpl(Chronology chrono, int years, int months, int days) {
	Objects.requireNonNull(chrono, "chrono");
	this.chrono = chrono;
	this.years = years;
	this.months = months;
	this.days = days;
	}

	//-----------------------------------------------------------------------
	@Override
	public long get(TemporalUnit unit) {
	if (unit == ChronoUnit.YEARS) {
	return years;
	} else if (unit == ChronoUnit.MONTHS) {
	return months;
	} else if (unit == ChronoUnit.DAYS) {
	return days;
	} else {
	throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit);
	}
	}

	@Override
	public List<TemporalUnit> getUnits() {
	return ChronoPeriodImpl.SUPPORTED_UNITS;
	}

	@Override
	public Chronology getChronology() {
	return chrono;
	}

	//-----------------------------------------------------------------------
	@Override
	public boolean isZero() {
	return years == 0 && months == 0 && days == 0;
	}

	@Override
	public boolean isNegative() {
	return years < 0 \|\| months < 0 \|\| days < 0;
	}

	//-----------------------------------------------------------------------
	@Override
	public ChronoPeriod plus(TemporalAmount amountToAdd) {
	ChronoPeriodImpl amount = validateAmount(amountToAdd);
	return new ChronoPeriodImpl(
	chrono,
	Math.addExact(years, amount.years),
	Math.addExact(months, amount.months),
	Math.addExact(days, amount.days));
	}

	@Override
	public ChronoPeriod minus(TemporalAmount amountToSubtract) {
	ChronoPeriodImpl amount = validateAmount(amountToSubtract);
	return new ChronoPeriodImpl(
	chrono,
	Math.subtractExact(years, amount.years),
	Math.subtractExact(months, amount.months),
	Math.subtractExact(days, amount.days));
	}

	/**
	* Obtains an instance of {@code ChronoPeriodImpl} from a temporal amount.
	*
	* @param amount the temporal amount to convert, not null
	* @return the period, not null
	*/
	private ChronoPeriodImpl validateAmount(TemporalAmount amount) {
	Objects.requireNonNull(amount, "amount");
	if (amount instanceof ChronoPeriodImpl == false) {
	throw new DateTimeException("Unable to obtain ChronoPeriod from TemporalAmount: " + amount.getClass());
	}
	ChronoPeriodImpl period = (ChronoPeriodImpl) amount;
	if (chrono.equals(period.getChronology()) == false) {
	throw new ClassCastException("Chronology mismatch, expected: " + chrono.getId() + ", actual: " + period.getChronology().getId());
	}
	return period;
	}

	//-----------------------------------------------------------------------
	@Override
	public ChronoPeriod multipliedBy(int scalar) {
	if (this.isZero() \|\| scalar == 1) {
	return this;
	}
	return new ChronoPeriodImpl(
	chrono,
	Math.multiplyExact(years, scalar),
	Math.multiplyExact(months, scalar),
	Math.multiplyExact(days, scalar));
	}

	//-----------------------------------------------------------------------
	@Override
	public ChronoPeriod normalized() {
	long monthRange = monthRange();
	if (monthRange > 0) {
	long totalMonths = years * monthRange + months;
	long splitYears = totalMonths / monthRange;
	int splitMonths = (int) (totalMonths % monthRange); // no overflow
	if (splitYears == years && splitMonths == months) {
	return this;
	}
	return new ChronoPeriodImpl(chrono, Math.toIntExact(splitYears), splitMonths, days);

	}
	return this;
	}

	/**
	* Calculates the range of months.
	*
	* @return the month range, -1 if not fixed range
	*/
	private long monthRange() {
	ValueRange startRange = chrono.range(MONTH_OF_YEAR);
	if (startRange.isFixed() && startRange.isIntValue()) {
	return startRange.getMaximum() - startRange.getMinimum() + 1;
	}
	return -1;
	}

	//-------------------------------------------------------------------------
	@Override
	public Temporal addTo(Temporal temporal) {
	validateChrono(temporal);
	if (months == 0) {
	if (years != 0) {
	temporal = temporal.plus(years, YEARS);
	}
	} else {
	long monthRange = monthRange();
	if (monthRange > 0) {
	temporal = temporal.plus(years * monthRange + months, MONTHS);
	} else {
	if (years != 0) {
	temporal = temporal.plus(years, YEARS);
	}
	temporal = temporal.plus(months, MONTHS);
	}
	}
	if (days != 0) {
	temporal = temporal.plus(days, DAYS);
	}
	return temporal;
	}



	@Override
	public Temporal subtractFrom(Temporal temporal) {
	validateChrono(temporal);
	if (months == 0) {
	if (years != 0) {
	temporal = temporal.minus(years, YEARS);
	}
	} else {
	long monthRange = monthRange();
	if (monthRange > 0) {
	temporal = temporal.minus(years * monthRange + months, MONTHS);
	} else {
	if (years != 0) {
	temporal = temporal.minus(years, YEARS);
	}
	temporal = temporal.minus(months, MONTHS);
	}
	}
	if (days != 0) {
	temporal = temporal.minus(days, DAYS);
	}
	return temporal;
	}

	/**
	* Validates that the temporal has the correct chronology.
	*/
	private void validateChrono(TemporalAccessor temporal) {
	Objects.requireNonNull(temporal, "temporal");
	Chronology temporalChrono = temporal.query(TemporalQueries.chronology());
	if (temporalChrono != null && chrono.equals(temporalChrono) == false) {
	throw new DateTimeException("Chronology mismatch, expected: " + chrono.getId() + ", actual: " + temporalChrono.getId());
	}
	}

	//-----------------------------------------------------------------------
	@Override
	public boolean equals(Object obj) {
	if (this == obj) {
	return true;
	}
	if (obj instanceof ChronoPeriodImpl) {
	ChronoPeriodImpl other = (ChronoPeriodImpl) obj;
	return years == other.years && months == other.months &&
	days == other.days && chrono.equals(other.chrono);
	}
	return false;
	}

	@Override
	public int hashCode() {
	return (years + Integer.rotateLeft(months, 8) + Integer.rotateLeft(days, 16)) ^ chrono.hashCode();
	}

	//-----------------------------------------------------------------------
	@Override
	public String toString() {
	if (isZero()) {
	return getChronology().toString() + " P0D";
	} else {
	StringBuilder buf = new StringBuilder();
	buf.append(getChronology().toString()).append(' ').append('P');
	if (years != 0) {
	buf.append(years).append('Y');
	}
	if (months != 0) {
	buf.append(months).append('M');
	}
	if (days != 0) {
	buf.append(days).append('D');
	}
	return buf.toString();
	}
	}

	//-----------------------------------------------------------------------
	/**
	* Writes the Chronology using a
	* <a href="../../../serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>.
	* <pre>
	* out.writeByte(12); // identifies this as a ChronoPeriodImpl
	* out.writeUTF(getId()); // the chronology
	* out.writeInt(years);
	* out.writeInt(months);
	* out.writeInt(days);
	* </pre>
	*
	* @return the instance of {@code Ser}, not null
	*/
	protected Object writeReplace() {
	return new Ser(Ser.CHRONO_PERIOD_TYPE, this);
	}

	/**
	* Defend against malicious streams.
	*
	* @param s the stream to read
	* @throws InvalidObjectException always
	*/
	private void readObject(ObjectInputStream s) throws ObjectStreamException {
	throw new InvalidObjectException("Deserialization via serialization delegate");
	}

	void writeExternal(DataOutput out) throws IOException {
	out.writeUTF(chrono.getId());
	out.writeInt(years);
	out.writeInt(months);
	out.writeInt(days);
	}

	static ChronoPeriodImpl readExternal(DataInput in) throws IOException {
	Chronology chrono = Chronology.of(in.readUTF());
	int years = in.readInt();
	int months = in.readInt();
	int days = in.readInt();
	return new ChronoPeriodImpl(chrono, years, months, days);
	}

	}

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