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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
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	*
	* 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).
	*
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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
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	package java.time;

	import static java.time.temporal.ChronoField.DAY_OF_WEEK;
	import static java.time.temporal.ChronoUnit.DAYS;

	import java.time.format.DateTimeFormatterBuilder;
	import java.time.format.TextStyle;
	import java.time.temporal.ChronoField;
	import java.time.temporal.Temporal;
	import java.time.temporal.TemporalAccessor;
	import java.time.temporal.TemporalAdjuster;
	import java.time.temporal.TemporalField;
	import java.time.temporal.TemporalQueries;
	import java.time.temporal.TemporalQuery;
	import java.time.temporal.UnsupportedTemporalTypeException;
	import java.time.temporal.ValueRange;
	import java.time.temporal.WeekFields;
	import java.util.Locale;

	/**
	* A day-of-week, such as 'Tuesday'.
	* <p>
	* {@code DayOfWeek} is an enum representing the 7 days of the week -
	* Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday.
	* <p>
	* In addition to the textual enum name, each day-of-week has an {@code int} value.
	* The {@code int} value follows the ISO-8601 standard, from 1 (Monday) to 7 (Sunday).
	* It is recommended that applications use the enum rather than the {@code int} value
	* to ensure code clarity.
	* <p>
	* This enum provides access to the localized textual form of the day-of-week.
	* Some locales also assign different numeric values to the days, declaring
	* Sunday to have the value 1, however this class provides no support for this.
	* See {@link WeekFields} for localized week-numbering.
	* <p>
	* <b>Do not use {@code ordinal()} to obtain the numeric representation of {@code DayOfWeek}.
	* Use {@code getValue()} instead.</b>
	* <p>
	* This enum represents a common concept that is found in many calendar systems.
	* As such, this enum may be used by any calendar system that has the day-of-week
	* concept defined exactly equivalent to the ISO calendar system.
	*
	* @implSpec
	* This is an immutable and thread-safe enum.
	*
	* @since 1.8
	*/
	public enum DayOfWeek implements TemporalAccessor, TemporalAdjuster {

	/**
	* The singleton instance for the day-of-week of Monday.
	* This has the numeric value of {@code 1}.
	*/
	MONDAY,
	/**
	* The singleton instance for the day-of-week of Tuesday.
	* This has the numeric value of {@code 2}.
	*/
	TUESDAY,
	/**
	* The singleton instance for the day-of-week of Wednesday.
	* This has the numeric value of {@code 3}.
	*/
	WEDNESDAY,
	/**
	* The singleton instance for the day-of-week of Thursday.
	* This has the numeric value of {@code 4}.
	*/
	THURSDAY,
	/**
	* The singleton instance for the day-of-week of Friday.
	* This has the numeric value of {@code 5}.
	*/
	FRIDAY,
	/**
	* The singleton instance for the day-of-week of Saturday.
	* This has the numeric value of {@code 6}.
	*/
	SATURDAY,
	/**
	* The singleton instance for the day-of-week of Sunday.
	* This has the numeric value of {@code 7}.
	*/
	SUNDAY;
	/**
	* Private cache of all the constants.
	*/
	private static final DayOfWeek[] ENUMS = DayOfWeek.values();

	//-----------------------------------------------------------------------
	/**
	* Obtains an instance of {@code DayOfWeek} from an {@code int} value.
	* <p>
	* {@code DayOfWeek} is an enum representing the 7 days of the week.
	* This factory allows the enum to be obtained from the {@code int} value.
	* The {@code int} value follows the ISO-8601 standard, from 1 (Monday) to 7 (Sunday).
	*
	* @param dayOfWeek the day-of-week to represent, from 1 (Monday) to 7 (Sunday)
	* @return the day-of-week singleton, not null
	* @throws DateTimeException if the day-of-week is invalid
	*/
	public static DayOfWeek of(int dayOfWeek) {
	if (dayOfWeek < 1 \|\| dayOfWeek > 7) {
	throw new DateTimeException("Invalid value for DayOfWeek: " + dayOfWeek);
	}
	return ENUMS[dayOfWeek - 1];
	}

	//-----------------------------------------------------------------------
	/**
	* Obtains an instance of {@code DayOfWeek} from a temporal object.
	* <p>
	* This obtains a day-of-week 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 DayOfWeek}.
	* <p>
	* The conversion extracts the {@link ChronoField#DAY_OF_WEEK DAY_OF_WEEK} field.
	* <p>
	* This method matches the signature of the functional interface {@link TemporalQuery}
	* allowing it to be used as a query via method reference, {@code DayOfWeek::from}.
	*
	* @param temporal the temporal object to convert, not null
	* @return the day-of-week, not null
	* @throws DateTimeException if unable to convert to a {@code DayOfWeek}
	*/
	public static DayOfWeek from(TemporalAccessor temporal) {
	if (temporal instanceof DayOfWeek) {
	return (DayOfWeek) temporal;
	}
	try {
	return of(temporal.get(DAY_OF_WEEK));
	} catch (DateTimeException ex) {
	throw new DateTimeException("Unable to obtain DayOfWeek from TemporalAccessor: " +
	temporal + " of type " + temporal.getClass().getName(), ex);
	}
	}

	//-----------------------------------------------------------------------
	/**
	* Gets the day-of-week {@code int} value.
	* <p>
	* The values are numbered following the ISO-8601 standard, from 1 (Monday) to 7 (Sunday).
	* See {@link java.time.temporal.WeekFields#dayOfWeek()} for localized week-numbering.
	*
	* @return the day-of-week, from 1 (Monday) to 7 (Sunday)
	*/
	public int getValue() {
	return ordinal() + 1;
	}

	//-----------------------------------------------------------------------
	/**
	* Gets the textual representation, such as 'Mon' or 'Friday'.
	* <p>
	* This returns the textual name used to identify the day-of-week,
	* suitable for presentation to the user.
	* The parameters control the style of the returned text and the locale.
	* <p>
	* If no textual mapping is found then the {@link #getValue() numeric value} is returned.
	*
	* @param style the length of the text required, not null
	* @param locale the locale to use, not null
	* @return the text value of the day-of-week, not null
	*/
	public String getDisplayName(TextStyle style, Locale locale) {
	return new DateTimeFormatterBuilder().appendText(DAY_OF_WEEK, style).toFormatter(locale).format(this);
	}

	//-----------------------------------------------------------------------
	/**
	* Checks if the specified field is supported.
	* <p>
	* This checks if this day-of-week 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 {@link ChronoField#DAY_OF_WEEK DAY_OF_WEEK} then
	* this method returns true.
	* 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 day-of-week, false if not
	*/
	@Override
	public boolean isSupported(TemporalField field) {
	if (field instanceof ChronoField) {
	return field == DAY_OF_WEEK;
	}
	return field != null && field.isSupportedBy(this);
	}

	/**
	* Gets the range of valid values for the specified field.
	* <p>
	* The range object expresses the minimum and maximum valid values for a field.
	* This day-of-week is used to enhance the accuracy of the returned range.
	* If it is not possible to return the range, because the field is not supported
	* or for some other reason, an exception is thrown.
	* <p>
	* If the field is {@link ChronoField#DAY_OF_WEEK DAY_OF_WEEK} then the
	* range of the day-of-week, from 1 to 7, will be returned.
	* All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
	* <p>
	* If the field is not a {@code ChronoField}, then the result of this method
	* is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)}
	* passing {@code this} as the argument.
	* Whether the range can be obtained is determined by the field.
	*
	* @param field the field to query the range for, not null
	* @return the range of valid values for the field, not null
	* @throws DateTimeException if the range for the field cannot be obtained
	* @throws UnsupportedTemporalTypeException if the field is not supported
	*/
	@Override
	public ValueRange range(TemporalField field) {
	if (field == DAY_OF_WEEK) {
	return field.range();
	}
	return TemporalAccessor.super.range(field);
	}

	/**
	* Gets the value of the specified field from this day-of-week as an {@code int}.
	* <p>
	* This queries this day-of-week for the value of the specified field.
	* The returned value will always be within the valid range of values for the field.
	* If it is not possible to return the value, because the field is not supported
	* or for some other reason, an exception is thrown.
	* <p>
	* If the field is {@link ChronoField#DAY_OF_WEEK DAY_OF_WEEK} then the
	* value of the day-of-week, from 1 to 7, will be returned.
	* All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
	* <p>
	* If the field is not a {@code ChronoField}, then the result of this method
	* is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
	* passing {@code this} as the argument. Whether the value can be obtained,
	* and what the value represents, is determined by the field.
	*
	* @param field the field to get, not null
	* @return the value for the field, within the valid range of values
	* @throws DateTimeException if a value for the field cannot be obtained or
	* the value is outside the range of valid values for the field
	* @throws UnsupportedTemporalTypeException if the field is not supported or
	* the range of values exceeds an {@code int}
	* @throws ArithmeticException if numeric overflow occurs
	*/
	@Override
	public int get(TemporalField field) {
	if (field == DAY_OF_WEEK) {
	return getValue();
	}
	return TemporalAccessor.super.get(field);
	}

	/**
	* Gets the value of the specified field from this day-of-week as a {@code long}.
	* <p>
	* This queries this day-of-week for the value of the specified field.
	* If it is not possible to return the value, because the field is not supported
	* or for some other reason, an exception is thrown.
	* <p>
	* If the field is {@link ChronoField#DAY_OF_WEEK DAY_OF_WEEK} then the
	* value of the day-of-week, from 1 to 7, will be returned.
	* All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
	* <p>
	* If the field is not a {@code ChronoField}, then the result of this method
	* is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
	* passing {@code this} as the argument. Whether the value can be obtained,
	* and what the value represents, is determined by the field.
	*
	* @param field the field to get, not null
	* @return the value for the field
	* @throws DateTimeException if a value for the field cannot be obtained
	* @throws UnsupportedTemporalTypeException if the field is not supported
	* @throws ArithmeticException if numeric overflow occurs
	*/
	@Override
	public long getLong(TemporalField field) {
	if (field == DAY_OF_WEEK) {
	return getValue();
	} else if (field instanceof ChronoField) {
	throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
	}
	return field.getFrom(this);
	}

	//-----------------------------------------------------------------------
	/**
	* Returns the day-of-week that is the specified number of days after this one.
	* <p>
	* The calculation rolls around the end of the week from Sunday to Monday.
	* The specified period may be negative.
	* <p>
	* This instance is immutable and unaffected by this method call.
	*
	* @param days the days to add, positive or negative
	* @return the resulting day-of-week, not null
	*/
	public DayOfWeek plus(long days) {
	int amount = (int) (days % 7);
	return ENUMS[(ordinal() + (amount + 7)) % 7];
	}

	/**
	* Returns the day-of-week that is the specified number of days before this one.
	* <p>
	* The calculation rolls around the start of the year from Monday to Sunday.
	* The specified period may be negative.
	* <p>
	* This instance is immutable and unaffected by this method call.
	*
	* @param days the days to subtract, positive or negative
	* @return the resulting day-of-week, not null
	*/
	public DayOfWeek minus(long days) {
	return plus(-(days % 7));
	}

	//-----------------------------------------------------------------------
	/**
	* Queries this day-of-week using the specified query.
	* <p>
	* This queries this day-of-week 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
	public <R> R query(TemporalQuery<R> query) {
	if (query == TemporalQueries.precision()) {
	return (R) DAYS;
	}
	return TemporalAccessor.super.query(query);
	}

	/**
	* Adjusts the specified temporal object to have this day-of-week.
	* <p>
	* This returns a temporal object of the same observable type as the input
	* with the day-of-week changed to be the same as this.
	* <p>
	* The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)}
	* passing {@link ChronoField#DAY_OF_WEEK} as the field.
	* Note that this adjusts forwards or backwards within a Monday to Sunday week.
	* See {@link java.time.temporal.WeekFields#dayOfWeek()} for localized week start days.
	* See {@code TemporalAdjuster} for other adjusters with more control,
	* such as {@code next(MONDAY)}.
	* <p>
	* In most cases, it is clearer to reverse the calling pattern by using
	* {@link Temporal#with(TemporalAdjuster)}:
	* <pre>
	* // these two lines are equivalent, but the second approach is recommended
	* temporal = thisDayOfWeek.adjustInto(temporal);
	* temporal = temporal.with(thisDayOfWeek);
	* </pre>
	* <p>
	* For example, given a date that is a Wednesday, the following are output:
	* <pre>
	* dateOnWed.with(MONDAY); // two days earlier
	* dateOnWed.with(TUESDAY); // one day earlier
	* dateOnWed.with(WEDNESDAY); // same date
	* dateOnWed.with(THURSDAY); // one day later
	* dateOnWed.with(FRIDAY); // two days later
	* dateOnWed.with(SATURDAY); // three days later
	* dateOnWed.with(SUNDAY); // four days later
	* </pre>
	* <p>
	* This instance is immutable and unaffected by this method call.
	*
	* @param temporal the target object to be adjusted, not null
	* @return the adjusted object, not null
	* @throws DateTimeException if unable to make the adjustment
	* @throws ArithmeticException if numeric overflow occurs
	*/
	@Override
	public Temporal adjustInto(Temporal temporal) {
	return temporal.with(DAY_OF_WEEK, getValue());
	}

	}

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