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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
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	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/
	package java.time.chrono;

	import static java.time.temporal.ChronoField.INSTANT_SECONDS;
	import static java.time.temporal.ChronoField.OFFSET_SECONDS;
	import static java.time.temporal.ChronoUnit.FOREVER;
	import static java.time.temporal.ChronoUnit.NANOS;

	import java.io.Serializable;
	import java.time.DateTimeException;
	import java.time.Instant;
	import java.time.LocalTime;
	import java.time.ZoneId;
	import java.time.ZoneOffset;
	import java.time.ZonedDateTime;
	import java.time.format.DateTimeFormatter;
	import java.time.temporal.ChronoField;
	import java.time.temporal.ChronoUnit;
	import java.time.temporal.Temporal;
	import java.time.temporal.TemporalAccessor;
	import java.time.temporal.TemporalAdjuster;
	import java.time.temporal.TemporalAmount;
	import java.time.temporal.TemporalField;
	import java.time.temporal.TemporalQueries;
	import java.time.temporal.TemporalQuery;
	import java.time.temporal.TemporalUnit;
	import java.time.temporal.UnsupportedTemporalTypeException;
	import java.time.temporal.ValueRange;
	import java.util.Comparator;
	import java.util.Objects;

	/**
	* A date-time with a time-zone in an arbitrary chronology,
	* intended for advanced globalization use cases.
	* <p>
	* <b>Most applications should declare method signatures, fields and variables
	* as {@link ZonedDateTime}, not this interface.</b>
	* <p>
	* A {@code ChronoZonedDateTime} is the abstract representation of an offset date-time
	* where the {@code Chronology chronology}, or calendar system, is pluggable.
	* The date-time is defined in terms of fields expressed by {@link TemporalField},
	* where most common implementations are defined in {@link ChronoField}.
	* The chronology defines how the calendar system operates and the meaning of
	* the standard fields.
	*
	* <h3>When to use this interface</h3>
	* The design of the API encourages the use of {@code ZonedDateTime} rather than this
	* interface, even in the case where the application needs to deal with multiple
	* calendar systems. The rationale for this is explored in detail in {@link ChronoLocalDate}.
	* <p>
	* Ensure that the discussion in {@code ChronoLocalDate} has been read and understood
	* before using this interface.
	*
	* @implSpec
	* This interface must be implemented with care to ensure other classes operate correctly.
	* All implementations that can be instantiated must be final, immutable and thread-safe.
	* Subclasses should be Serializable wherever possible.
	*
	* @param <D> the concrete type for the date of this date-time
	* @since 1.8
	*/
	public interface ChronoZonedDateTime<D extends ChronoLocalDate>
	extends Temporal, Comparable<ChronoZonedDateTime<?>> {

	/**
	* Gets a comparator that compares {@code ChronoZonedDateTime} in
	* time-line order ignoring the chronology.
	* <p>
	* This comparator differs from the comparison in {@link #compareTo} in that it
	* only compares the underlying instant and not the chronology.
	* This allows dates in different calendar systems to be compared based
	* on the position of the date-time on the instant time-line.
	* The underlying comparison is equivalent to comparing the epoch-second and nano-of-second.
	*
	* @return a comparator that compares in time-line order ignoring the chronology
	* @see #isAfter
	* @see #isBefore
	* @see #isEqual
	*/
	static Comparator<ChronoZonedDateTime<?>> timeLineOrder() {
	return (Comparator<ChronoZonedDateTime<?>> & Serializable) (dateTime1, dateTime2) -> {
	int cmp = Long.compare(dateTime1.toEpochSecond(), dateTime2.toEpochSecond());
	if (cmp == 0) {
	cmp = Long.compare(dateTime1.toLocalTime().getNano(), dateTime2.toLocalTime().getNano());
	}
	return cmp;
	};
	}

	//-----------------------------------------------------------------------
	/**
	* Obtains an instance of {@code ChronoZonedDateTime} from a temporal object.
	* <p>
	* This creates a zoned date-time 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 ChronoZonedDateTime}.
	* <p>
	* The conversion extracts and combines the chronology, date, time and zone
	* from the temporal object. The behavior is equivalent to using
	* {@link Chronology#zonedDateTime(TemporalAccessor)} with the extracted chronology.
	* Implementations are permitted to perform optimizations such as accessing
	* those fields that are equivalent to the relevant objects.
	* <p>
	* This method matches the signature of the functional interface {@link TemporalQuery}
	* allowing it to be used as a query via method reference, {@code ChronoZonedDateTime::from}.
	*
	* @param temporal the temporal object to convert, not null
	* @return the date-time, not null
	* @throws DateTimeException if unable to convert to a {@code ChronoZonedDateTime}
	* @see Chronology#zonedDateTime(TemporalAccessor)
	*/
	static ChronoZonedDateTime<?> from(TemporalAccessor temporal) {
	if (temporal instanceof ChronoZonedDateTime) {
	return (ChronoZonedDateTime<?>) temporal;
	}
	Objects.requireNonNull(temporal, "temporal");
	Chronology chrono = temporal.query(TemporalQueries.chronology());
	if (chrono == null) {
	throw new DateTimeException("Unable to obtain ChronoZonedDateTime from TemporalAccessor: " + temporal.getClass());
	}
	return chrono.zonedDateTime(temporal);
	}

	//-----------------------------------------------------------------------
	@Override
	default ValueRange range(TemporalField field) {
	if (field instanceof ChronoField) {
	if (field == INSTANT_SECONDS \|\| field == OFFSET_SECONDS) {
	return field.range();
	}
	return toLocalDateTime().range(field);
	}
	return field.rangeRefinedBy(this);
	}

	@Override
	default int get(TemporalField field) {
	if (field instanceof ChronoField) {
	switch ((ChronoField) field) {
	case INSTANT_SECONDS:
	throw new UnsupportedTemporalTypeException("Invalid field 'InstantSeconds' for get() method, use getLong() instead");
	case OFFSET_SECONDS:
	return getOffset().getTotalSeconds();
	}
	return toLocalDateTime().get(field);
	}
	return Temporal.super.get(field);
	}

	@Override
	default long getLong(TemporalField field) {
	if (field instanceof ChronoField) {
	switch ((ChronoField) field) {
	case INSTANT_SECONDS: return toEpochSecond();
	case OFFSET_SECONDS: return getOffset().getTotalSeconds();
	}
	return toLocalDateTime().getLong(field);
	}
	return field.getFrom(this);
	}

	/**
	* Gets the local date part of this date-time.
	* <p>
	* This returns a local date with the same year, month and day
	* as this date-time.
	*
	* @return the date part of this date-time, not null
	*/
	default D toLocalDate() {
	return toLocalDateTime().toLocalDate();
	}

	/**
	* Gets the local time part of this date-time.
	* <p>
	* This returns a local time with the same hour, minute, second and
	* nanosecond as this date-time.
	*
	* @return the time part of this date-time, not null
	*/
	default LocalTime toLocalTime() {
	return toLocalDateTime().toLocalTime();
	}

	/**
	* Gets the local date-time part of this date-time.
	* <p>
	* This returns a local date with the same year, month and day
	* as this date-time.
	*
	* @return the local date-time part of this date-time, not null
	*/
	ChronoLocalDateTime<D> toLocalDateTime();

	/**
	* Gets the chronology of this date-time.
	* <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 chronology, not null
	*/
	default Chronology getChronology() {
	return toLocalDate().getChronology();
	}

	/**
	* Gets the zone offset, such as '+01:00'.
	* <p>
	* This is the offset of the local date-time from UTC/Greenwich.
	*
	* @return the zone offset, not null
	*/
	ZoneOffset getOffset();

	/**
	* Gets the zone ID, such as 'Europe/Paris'.
	* <p>
	* This returns the stored time-zone id used to determine the time-zone rules.
	*
	* @return the zone ID, not null
	*/
	ZoneId getZone();

	//-----------------------------------------------------------------------
	/**
	* Returns a copy of this date-time changing the zone offset to the
	* earlier of the two valid offsets at a local time-line overlap.
	* <p>
	* This method only has any effect when the local time-line overlaps, such as
	* at an autumn daylight savings cutover. In this scenario, there are two
	* valid offsets for the local date-time. Calling this method will return
	* a zoned date-time with the earlier of the two selected.
	* <p>
	* If this method is called when it is not an overlap, {@code this}
	* is returned.
	* <p>
	* This instance is immutable and unaffected by this method call.
	*
	* @return a {@code ChronoZonedDateTime} based on this date-time with the earlier offset, not null
	* @throws DateTimeException if no rules can be found for the zone
	* @throws DateTimeException if no rules are valid for this date-time
	*/
	ChronoZonedDateTime<D> withEarlierOffsetAtOverlap();

	/**
	* Returns a copy of this date-time changing the zone offset to the
	* later of the two valid offsets at a local time-line overlap.
	* <p>
	* This method only has any effect when the local time-line overlaps, such as
	* at an autumn daylight savings cutover. In this scenario, there are two
	* valid offsets for the local date-time. Calling this method will return
	* a zoned date-time with the later of the two selected.
	* <p>
	* If this method is called when it is not an overlap, {@code this}
	* is returned.
	* <p>
	* This instance is immutable and unaffected by this method call.
	*
	* @return a {@code ChronoZonedDateTime} based on this date-time with the later offset, not null
	* @throws DateTimeException if no rules can be found for the zone
	* @throws DateTimeException if no rules are valid for this date-time
	*/
	ChronoZonedDateTime<D> withLaterOffsetAtOverlap();

	/**
	* Returns a copy of this date-time with a different time-zone,
	* retaining the local date-time if possible.
	* <p>
	* This method changes the time-zone and retains the local date-time.
	* The local date-time is only changed if it is invalid for the new zone.
	* <p>
	* To change the zone and adjust the local date-time,
	* use {@link #withZoneSameInstant(ZoneId)}.
	* <p>
	* This instance is immutable and unaffected by this method call.
	*
	* @param zone the time-zone to change to, not null
	* @return a {@code ChronoZonedDateTime} based on this date-time with the requested zone, not null
	*/
	ChronoZonedDateTime<D> withZoneSameLocal(ZoneId zone);

	/**
	* Returns a copy of this date-time with a different time-zone,
	* retaining the instant.
	* <p>
	* This method changes the time-zone and retains the instant.
	* This normally results in a change to the local date-time.
	* <p>
	* This method is based on retaining the same instant, thus gaps and overlaps
	* in the local time-line have no effect on the result.
	* <p>
	* To change the offset while keeping the local time,
	* use {@link #withZoneSameLocal(ZoneId)}.
	*
	* @param zone the time-zone to change to, not null
	* @return a {@code ChronoZonedDateTime} based on this date-time with the requested zone, not null
	* @throws DateTimeException if the result exceeds the supported date range
	*/
	ChronoZonedDateTime<D> withZoneSameInstant(ZoneId zone);

	/**
	* Checks if the specified field is supported.
	* <p>
	* This checks if the specified field can be queried on this date-time.
	* If false, then calling the {@link #range(TemporalField) range},
	* {@link #get(TemporalField) get} and {@link #with(TemporalField, long)}
	* methods will throw an exception.
	* <p>
	* The set of supported fields is defined by the chronology and normally includes
	* all {@code ChronoField} fields.
	* <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 can be queried, false if not
	*/
	@Override
	boolean isSupported(TemporalField field);

	/**
	* Checks if the specified unit is supported.
	* <p>
	* This checks if the specified unit can be added to or subtracted from this date-time.
	* If false, then calling the {@link #plus(long, TemporalUnit)} and
	* {@link #minus(long, TemporalUnit) minus} methods will throw an exception.
	* <p>
	* The set of supported units is defined by the chronology and normally includes
	* all {@code ChronoUnit} units except {@code FOREVER}.
	* <p>
	* If the unit is not a {@code ChronoUnit}, then the result of this method
	* is obtained by invoking {@code TemporalUnit.isSupportedBy(Temporal)}
	* passing {@code this} as the argument.
	* Whether the unit is supported is determined by the unit.
	*
	* @param unit the unit to check, null returns false
	* @return true if the unit can be added/subtracted, false if not
	*/
	@Override
	default boolean isSupported(TemporalUnit unit) {
	if (unit instanceof ChronoUnit) {
	return unit != FOREVER;
	}
	return unit != null && unit.isSupportedBy(this);
	}

	//-----------------------------------------------------------------------
	// override for covariant return type
	/**
	* {@inheritDoc}
	* @throws DateTimeException {@inheritDoc}
	* @throws ArithmeticException {@inheritDoc}
	*/
	@Override
	default ChronoZonedDateTime<D> with(TemporalAdjuster adjuster) {
	return ChronoZonedDateTimeImpl.ensureValid(getChronology(), Temporal.super.with(adjuster));
	}

	/**
	* {@inheritDoc}
	* @throws DateTimeException {@inheritDoc}
	* @throws ArithmeticException {@inheritDoc}
	*/
	@Override
	ChronoZonedDateTime<D> with(TemporalField field, long newValue);

	/**
	* {@inheritDoc}
	* @throws DateTimeException {@inheritDoc}
	* @throws ArithmeticException {@inheritDoc}
	*/
	@Override
	default ChronoZonedDateTime<D> plus(TemporalAmount amount) {
	return ChronoZonedDateTimeImpl.ensureValid(getChronology(), Temporal.super.plus(amount));
	}

	/**
	* {@inheritDoc}
	* @throws DateTimeException {@inheritDoc}
	* @throws ArithmeticException {@inheritDoc}
	*/
	@Override
	ChronoZonedDateTime<D> plus(long amountToAdd, TemporalUnit unit);

	/**
	* {@inheritDoc}
	* @throws DateTimeException {@inheritDoc}
	* @throws ArithmeticException {@inheritDoc}
	*/
	@Override
	default ChronoZonedDateTime<D> minus(TemporalAmount amount) {
	return ChronoZonedDateTimeImpl.ensureValid(getChronology(), Temporal.super.minus(amount));
	}

	/**
	* {@inheritDoc}
	* @throws DateTimeException {@inheritDoc}
	* @throws ArithmeticException {@inheritDoc}
	*/
	@Override
	default ChronoZonedDateTime<D> minus(long amountToSubtract, TemporalUnit unit) {
	return ChronoZonedDateTimeImpl.ensureValid(getChronology(), Temporal.super.minus(amountToSubtract, unit));
	}

	//-----------------------------------------------------------------------
	/**
	* Queries this date-time using the specified query.
	* <p>
	* This queries this date-time using the specified query strategy object.
	* The {@code TemporalQuery} object defines the logic to be used to
	* obtain the result. Read the documentation of the query to understand
	* what the result of this method will be.
	* <p>
	* The result of this method is obtained by invoking the
	* {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
	* specified query passing {@code this} as the argument.
	*
	* @param <R> the type of the result
	* @param query the query to invoke, not null
	* @return the query result, null may be returned (defined by the query)
	* @throws DateTimeException if unable to query (defined by the query)
	* @throws ArithmeticException if numeric overflow occurs (defined by the query)
	*/
	@SuppressWarnings("unchecked")
	@Override
	default <R> R query(TemporalQuery<R> query) {
	if (query == TemporalQueries.zone() \|\| query == TemporalQueries.zoneId()) {
	return (R) getZone();
	} else if (query == TemporalQueries.offset()) {
	return (R) getOffset();
	} else if (query == TemporalQueries.localTime()) {
	return (R) toLocalTime();
	} else if (query == TemporalQueries.chronology()) {
	return (R) getChronology();
	} else if (query == TemporalQueries.precision()) {
	return (R) NANOS;
	}
	// inline TemporalAccessor.super.query(query) as an optimization
	// non-JDK classes are not permitted to make this optimization
	return query.queryFrom(this);
	}

	/**
	* Formats this date-time using the specified formatter.
	* <p>
	* This date-time will be passed to the formatter to produce a string.
	* <p>
	* The default implementation must behave as follows:
	* <pre>
	* return formatter.format(this);
	* </pre>
	*
	* @param formatter the formatter to use, not null
	* @return the formatted date-time string, not null
	* @throws DateTimeException if an error occurs during printing
	*/
	default String format(DateTimeFormatter formatter) {
	Objects.requireNonNull(formatter, "formatter");
	return formatter.format(this);
	}

	//-----------------------------------------------------------------------
	/**
	* Converts this date-time to an {@code Instant}.
	* <p>
	* This returns an {@code Instant} representing the same point on the
	* time-line as this date-time. The calculation combines the
	* {@linkplain #toLocalDateTime() local date-time} and
	* {@linkplain #getOffset() offset}.
	*
	* @return an {@code Instant} representing the same instant, not null
	*/
	default Instant toInstant() {
	return Instant.ofEpochSecond(toEpochSecond(), toLocalTime().getNano());
	}

	/**
	* Converts this date-time to the number of seconds from the epoch
	* of 1970-01-01T00:00:00Z.
	* <p>
	* This uses the {@linkplain #toLocalDateTime() local date-time} and
	* {@linkplain #getOffset() offset} to calculate the epoch-second value,
	* which is the number of elapsed seconds from 1970-01-01T00:00:00Z.
	* Instants on the time-line after the epoch are positive, earlier are negative.
	*
	* @return the number of seconds from the epoch of 1970-01-01T00:00:00Z
	*/
	default long toEpochSecond() {
	long epochDay = toLocalDate().toEpochDay();
	long secs = epochDay * 86400 + toLocalTime().toSecondOfDay();
	secs -= getOffset().getTotalSeconds();
	return secs;
	}

	//-----------------------------------------------------------------------
	/**
	* Compares this date-time to another date-time, including the chronology.
	* <p>
	* The comparison is based first on the instant, then on the local date-time,
	* then on the zone ID, then on the chronology.
	* It is "consistent with equals", as defined by {@link Comparable}.
	* <p>
	* If all the date-time objects being compared are in the same chronology, then the
	* additional chronology stage is not required.
	* <p>
	* This default implementation performs the comparison defined above.
	*
	* @param other the other date-time to compare to, not null
	* @return the comparator value, negative if less, positive if greater
	*/
	@Override
	default int compareTo(ChronoZonedDateTime<?> other) {
	int cmp = Long.compare(toEpochSecond(), other.toEpochSecond());
	if (cmp == 0) {
	cmp = toLocalTime().getNano() - other.toLocalTime().getNano();
	if (cmp == 0) {
	cmp = toLocalDateTime().compareTo(other.toLocalDateTime());
	if (cmp == 0) {
	cmp = getZone().getId().compareTo(other.getZone().getId());
	if (cmp == 0) {
	cmp = getChronology().compareTo(other.getChronology());
	}
	}
	}
	}
	return cmp;
	}

	/**
	* Checks if the instant of this date-time is before that of the specified date-time.
	* <p>
	* This method differs from the comparison in {@link #compareTo} in that it
	* only compares the instant of the date-time. This is equivalent to using
	* {@code dateTime1.toInstant().isBefore(dateTime2.toInstant());}.
	* <p>
	* This default implementation performs the comparison based on the epoch-second
	* and nano-of-second.
	*
	* @param other the other date-time to compare to, not null
	* @return true if this point is before the specified date-time
	*/
	default boolean isBefore(ChronoZonedDateTime<?> other) {
	long thisEpochSec = toEpochSecond();
	long otherEpochSec = other.toEpochSecond();
	return thisEpochSec < otherEpochSec \|\|
	(thisEpochSec == otherEpochSec && toLocalTime().getNano() < other.toLocalTime().getNano());
	}

	/**
	* Checks if the instant of this date-time is after that of the specified date-time.
	* <p>
	* This method differs from the comparison in {@link #compareTo} in that it
	* only compares the instant of the date-time. This is equivalent to using
	* {@code dateTime1.toInstant().isAfter(dateTime2.toInstant());}.
	* <p>
	* This default implementation performs the comparison based on the epoch-second
	* and nano-of-second.
	*
	* @param other the other date-time to compare to, not null
	* @return true if this is after the specified date-time
	*/
	default boolean isAfter(ChronoZonedDateTime<?> other) {
	long thisEpochSec = toEpochSecond();
	long otherEpochSec = other.toEpochSecond();
	return thisEpochSec > otherEpochSec \|\|
	(thisEpochSec == otherEpochSec && toLocalTime().getNano() > other.toLocalTime().getNano());
	}

	/**
	* Checks if the instant of this date-time is equal to that of the specified date-time.
	* <p>
	* This method differs from the comparison in {@link #compareTo} and {@link #equals}
	* in that it only compares the instant of the date-time. This is equivalent to using
	* {@code dateTime1.toInstant().equals(dateTime2.toInstant());}.
	* <p>
	* This default implementation performs the comparison based on the epoch-second
	* and nano-of-second.
	*
	* @param other the other date-time to compare to, not null
	* @return true if the instant equals the instant of the specified date-time
	*/
	default boolean isEqual(ChronoZonedDateTime<?> other) {
	return toEpochSecond() == other.toEpochSecond() &&
	toLocalTime().getNano() == other.toLocalTime().getNano();
	}

	//-----------------------------------------------------------------------
	/**
	* Checks if this date-time is equal to another date-time.
	* <p>
	* The comparison is based on the offset date-time and the zone.
	* To compare for the same instant on the time-line, use {@link #compareTo}.
	* Only objects of type {@code ChronoZonedDateTime} are compared, other types return false.
	*
	* @param obj the object to check, null returns false
	* @return true if this is equal to the other date-time
	*/
	@Override
	boolean equals(Object obj);

	/**
	* A hash code for this date-time.
	*
	* @return a suitable hash code
	*/
	@Override
	int hashCode();

	//-----------------------------------------------------------------------
	/**
	* Outputs this date-time as a {@code String}.
	* <p>
	* The output will include the full zoned date-time.
	*
	* @return a string representation of this date-time, not null
	*/
	@Override
	String toString();

	}

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