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	/*
	* 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
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	*/

	/*
	* This file is available under and governed by the GNU General Public
	* License version 2 only, as published by the Free Software Foundation.
	* However, the following notice accompanied the original version of this
	* file:
	*
	* Copyright (c) 2007-2012, 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
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	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/
	package java.time.chrono;

	import static java.time.temporal.ChronoUnit.SECONDS;

	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.Instant;
	import java.time.LocalDateTime;
	import java.time.ZoneId;
	import java.time.ZoneOffset;
	import java.time.temporal.ChronoField;
	import java.time.temporal.ChronoUnit;
	import java.time.temporal.Temporal;
	import java.time.temporal.TemporalField;
	import java.time.temporal.TemporalUnit;
	import java.time.zone.ZoneOffsetTransition;
	import java.time.zone.ZoneRules;
	import java.util.List;
	import java.util.Objects;

	/**
	* A date-time with a time-zone in the calendar neutral API.
	* <p>
	* {@code ZoneChronoDateTime} is an immutable representation of a date-time with a time-zone.
	* This class stores all date and time fields, to a precision of nanoseconds,
	* as well as a time-zone and zone offset.
	* <p>
	* The purpose of storing the time-zone is to distinguish the ambiguous case where
	* the local time-line overlaps, typically as a result of the end of daylight time.
	* Information about the local-time can be obtained using methods on the time-zone.
	*
	* @implSpec
	* This class is immutable and thread-safe.
	*
	* @serial Document the delegation of this class in the serialized-form specification.
	* @param <D> the concrete type for the date of this date-time
	* @since 1.8
	*/
	final class ChronoZonedDateTimeImpl<D extends ChronoLocalDate>
	implements ChronoZonedDateTime<D>, Serializable {

	/**
	* Serialization version.
	*/
	private static final long serialVersionUID = -5261813987200935591L;

	/**
	* The local date-time.
	*/
	private final transient ChronoLocalDateTimeImpl<D> dateTime;
	/**
	* The zone offset.
	*/
	private final transient ZoneOffset offset;
	/**
	* The zone ID.
	*/
	private final transient ZoneId zone;

	//-----------------------------------------------------------------------
	/**
	* Obtains an instance from a local date-time using the preferred offset if possible.
	*
	* @param localDateTime the local date-time, not null
	* @param zone the zone identifier, not null
	* @param preferredOffset the zone offset, null if no preference
	* @return the zoned date-time, not null
	*/
	static <R extends ChronoLocalDate> ChronoZonedDateTime<R> ofBest(
	ChronoLocalDateTimeImpl<R> localDateTime, ZoneId zone, ZoneOffset preferredOffset) {
	Objects.requireNonNull(localDateTime, "localDateTime");
	Objects.requireNonNull(zone, "zone");
	if (zone instanceof ZoneOffset) {
	return new ChronoZonedDateTimeImpl<>(localDateTime, (ZoneOffset) zone, zone);
	}
	ZoneRules rules = zone.getRules();
	LocalDateTime isoLDT = LocalDateTime.from(localDateTime);
	List<ZoneOffset> validOffsets = rules.getValidOffsets(isoLDT);
	ZoneOffset offset;
	if (validOffsets.size() == 1) {
	offset = validOffsets.get(0);
	} else if (validOffsets.size() == 0) {
	ZoneOffsetTransition trans = rules.getTransition(isoLDT);
	localDateTime = localDateTime.plusSeconds(trans.getDuration().getSeconds());
	offset = trans.getOffsetAfter();
	} else {
	if (preferredOffset != null && validOffsets.contains(preferredOffset)) {
	offset = preferredOffset;
	} else {
	offset = validOffsets.get(0);
	}
	}
	Objects.requireNonNull(offset, "offset"); // protect against bad ZoneRules
	return new ChronoZonedDateTimeImpl<>(localDateTime, offset, zone);
	}

	/**
	* Obtains an instance from an instant using the specified time-zone.
	*
	* @param chrono the chronology, not null
	* @param instant the instant, not null
	* @param zone the zone identifier, not null
	* @return the zoned date-time, not null
	*/
	static ChronoZonedDateTimeImpl<?> ofInstant(Chronology chrono, Instant instant, ZoneId zone) {
	ZoneRules rules = zone.getRules();
	ZoneOffset offset = rules.getOffset(instant);
	Objects.requireNonNull(offset, "offset"); // protect against bad ZoneRules
	LocalDateTime ldt = LocalDateTime.ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset);
	ChronoLocalDateTimeImpl<?> cldt = (ChronoLocalDateTimeImpl<?>)chrono.localDateTime(ldt);
	return new ChronoZonedDateTimeImpl<>(cldt, offset, zone);
	}

	/**
	* Obtains an instance from an {@code Instant}.
	*
	* @param instant the instant to create the date-time from, not null
	* @param zone the time-zone to use, validated not null
	* @return the zoned date-time, validated not null
	*/
	@SuppressWarnings("unchecked")
	private ChronoZonedDateTimeImpl<D> create(Instant instant, ZoneId zone) {
	return (ChronoZonedDateTimeImpl<D>)ofInstant(getChronology(), instant, zone);
	}

	/**
	* Casts the {@code Temporal} to {@code ChronoZonedDateTimeImpl} ensuring it bas the specified chronology.
	*
	* @param chrono the chronology to check for, not null
	* @param temporal a date-time to cast, not null
	* @return the date-time checked and cast to {@code ChronoZonedDateTimeImpl}, not null
	* @throws ClassCastException if the date-time cannot be cast to ChronoZonedDateTimeImpl
	* or the chronology is not equal this Chronology
	*/
	static <R extends ChronoLocalDate> ChronoZonedDateTimeImpl<R> ensureValid(Chronology chrono, Temporal temporal) {
	@SuppressWarnings("unchecked")
	ChronoZonedDateTimeImpl<R> other = (ChronoZonedDateTimeImpl<R>) temporal;
	if (chrono.equals(other.getChronology()) == false) {
	throw new ClassCastException("Chronology mismatch, required: " + chrono.getId()
	+ ", actual: " + other.getChronology().getId());
	}
	return other;
	}

	//-----------------------------------------------------------------------
	/**
	* Constructor.
	*
	* @param dateTime the date-time, not null
	* @param offset the zone offset, not null
	* @param zone the zone ID, not null
	*/
	private ChronoZonedDateTimeImpl(ChronoLocalDateTimeImpl<D> dateTime, ZoneOffset offset, ZoneId zone) {
	this.dateTime = Objects.requireNonNull(dateTime, "dateTime");
	this.offset = Objects.requireNonNull(offset, "offset");
	this.zone = Objects.requireNonNull(zone, "zone");
	}

	//-----------------------------------------------------------------------
	@Override
	public ZoneOffset getOffset() {
	return offset;
	}

	@Override
	public ChronoZonedDateTime<D> withEarlierOffsetAtOverlap() {
	ZoneOffsetTransition trans = getZone().getRules().getTransition(LocalDateTime.from(this));
	if (trans != null && trans.isOverlap()) {
	ZoneOffset earlierOffset = trans.getOffsetBefore();
	if (earlierOffset.equals(offset) == false) {
	return new ChronoZonedDateTimeImpl<>(dateTime, earlierOffset, zone);
	}
	}
	return this;
	}

	@Override
	public ChronoZonedDateTime<D> withLaterOffsetAtOverlap() {
	ZoneOffsetTransition trans = getZone().getRules().getTransition(LocalDateTime.from(this));
	if (trans != null) {
	ZoneOffset offset = trans.getOffsetAfter();
	if (offset.equals(getOffset()) == false) {
	return new ChronoZonedDateTimeImpl<>(dateTime, offset, zone);
	}
	}
	return this;
	}

	//-----------------------------------------------------------------------
	@Override
	public ChronoLocalDateTime<D> toLocalDateTime() {
	return dateTime;
	}

	@Override
	public ZoneId getZone() {
	return zone;
	}

	@Override
	public ChronoZonedDateTime<D> withZoneSameLocal(ZoneId zone) {
	return ofBest(dateTime, zone, offset);
	}

	@Override
	public ChronoZonedDateTime<D> withZoneSameInstant(ZoneId zone) {
	Objects.requireNonNull(zone, "zone");
	return this.zone.equals(zone) ? this : create(dateTime.toInstant(offset), zone);
	}

	//-----------------------------------------------------------------------
	@Override
	public boolean isSupported(TemporalField field) {
	return field instanceof ChronoField \|\| (field != null && field.isSupportedBy(this));
	}

	//-----------------------------------------------------------------------
	@Override
	public ChronoZonedDateTime<D> with(TemporalField field, long newValue) {
	if (field instanceof ChronoField) {
	ChronoField f = (ChronoField) field;
	switch (f) {
	case INSTANT_SECONDS: return plus(newValue - toEpochSecond(), SECONDS);
	case OFFSET_SECONDS: {
	ZoneOffset offset = ZoneOffset.ofTotalSeconds(f.checkValidIntValue(newValue));
	return create(dateTime.toInstant(offset), zone);
	}
	}
	return ofBest(dateTime.with(field, newValue), zone, offset);
	}
	return ChronoZonedDateTimeImpl.ensureValid(getChronology(), field.adjustInto(this, newValue));
	}

	//-----------------------------------------------------------------------
	@Override
	public ChronoZonedDateTime<D> plus(long amountToAdd, TemporalUnit unit) {
	if (unit instanceof ChronoUnit) {
	return with(dateTime.plus(amountToAdd, unit));
	}
	return ChronoZonedDateTimeImpl.ensureValid(getChronology(), unit.addTo(this, amountToAdd)); /// TODO: Generics replacement Risk!
	}

	//-----------------------------------------------------------------------
	@Override
	public long until(Temporal endExclusive, TemporalUnit unit) {
	Objects.requireNonNull(endExclusive, "endExclusive");
	@SuppressWarnings("unchecked")
	ChronoZonedDateTime<D> end = (ChronoZonedDateTime<D>) getChronology().zonedDateTime(endExclusive);
	if (unit instanceof ChronoUnit) {
	end = end.withZoneSameInstant(offset);
	return dateTime.until(end.toLocalDateTime(), unit);
	}
	Objects.requireNonNull(unit, "unit");
	return unit.between(this, end);
	}

	//-----------------------------------------------------------------------
	/**
	* Writes the ChronoZonedDateTime using a
	* <a href="../../../serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>.
	* @serialData
	* <pre>
	* out.writeByte(3); // identifies a ChronoZonedDateTime
	* out.writeObject(toLocalDateTime());
	* out.writeObject(getOffset());
	* out.writeObject(getZone());
	* </pre>
	*
	* @return the instance of {@code Ser}, not null
	*/
	private Object writeReplace() {
	return new Ser(Ser.CHRONO_ZONE_DATE_TIME_TYPE, this);
	}

	/**
	* 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");
	}

	void writeExternal(ObjectOutput out) throws IOException {
	out.writeObject(dateTime);
	out.writeObject(offset);
	out.writeObject(zone);
	}

	static ChronoZonedDateTime<?> readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
	ChronoLocalDateTime<?> dateTime = (ChronoLocalDateTime<?>) in.readObject();
	ZoneOffset offset = (ZoneOffset) in.readObject();
	ZoneId zone = (ZoneId) in.readObject();
	return dateTime.atZone(offset).withZoneSameLocal(zone);
	// TODO: ZDT uses ofLenient()
	}

	//-------------------------------------------------------------------------
	@Override
	public boolean equals(Object obj) {
	if (this == obj) {
	return true;
	}
	if (obj instanceof ChronoZonedDateTime) {
	return compareTo((ChronoZonedDateTime<?>) obj) == 0;
	}
	return false;
	}

	@Override
	public int hashCode() {
	return toLocalDateTime().hashCode() ^ getOffset().hashCode() ^ Integer.rotateLeft(getZone().hashCode(), 3);
	}

	@Override
	public String toString() {
	String str = toLocalDateTime().toString() + getOffset().toString();
	if (getOffset() != getZone()) {
	str += '[' + getZone().toString() + ']';
	}
	return str;
	}


	}

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