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	/*
	* Copyright (c) 2000, 2019, 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.
	*/

	package sun.util;

	import java.io.IOException;
	import java.io.ObjectInputStream;
	import java.util.GregorianCalendar;
	import java.util.Locale;
	import java.util.Map;
	import java.util.TimeZone;
	import sun.util.locale.provider.CalendarDataUtility;

	public class BuddhistCalendar extends GregorianCalendar {

	//////////////////
	// Class Variables
	//////////////////

	@java.io.Serial
	private static final long serialVersionUID = -8527488697350388578L;

	private static final int BUDDHIST_YEAR_OFFSET = 543;

	///////////////
	// Constructors
	///////////////

	/**
	* Constructs a default BuddhistCalendar using the current time
	* in the default time zone with the default locale.
	*/
	public BuddhistCalendar() {
	super();
	}

	/**
	* Constructs a BuddhistCalendar based on the current time
	* in the given time zone with the default locale.
	* @param zone the given time zone.
	*/
	public BuddhistCalendar(TimeZone zone) {
	super(zone);
	}

	/**
	* Constructs a BuddhistCalendar based on the current time
	* in the default time zone with the given locale.
	* @param aLocale the given locale.
	*/
	public BuddhistCalendar(Locale aLocale) {
	super(aLocale);
	}

	/**
	* Constructs a BuddhistCalendar based on the current time
	* in the given time zone with the given locale.
	* @param zone the given time zone.
	* @param aLocale the given locale.
	*/
	public BuddhistCalendar(TimeZone zone, Locale aLocale) {
	super(zone, aLocale);
	}

	/////////////////
	// Public methods
	/////////////////

	/**
	* Returns {@code "buddhist"} as the calendar type of this Calendar.
	*/
	@Override
	public String getCalendarType() {
	return "buddhist";
	}

	/**
	* Compares this BuddhistCalendar to an object reference.
	* @param obj the object reference with which to compare
	* @return true if this object is equal to <code>obj</code>; false otherwise
	*/
	@Override
	public boolean equals(Object obj) {
	return obj instanceof BuddhistCalendar
	&& super.equals(obj);
	}

	/**
	* Override hashCode.
	* Generates the hash code for the BuddhistCalendar object
	*/
	@Override
	public int hashCode() {
	return super.hashCode() ^ BUDDHIST_YEAR_OFFSET;
	}

	/**
	* Gets the value for a given time field.
	* @param field the given time field.
	* @return the value for the given time field.
	*/
	@Override
	public int get(int field)
	{
	if (field == YEAR) {
	return super.get(field) + yearOffset;
	}
	return super.get(field);
	}

	/**
	* Sets the time field with the given value.
	* @param field the given time field.
	* @param value the value to be set for the given time field.
	*/
	@Override
	public void set(int field, int value)
	{
	if (field == YEAR) {
	super.set(field, value - yearOffset);
	} else {
	super.set(field, value);
	}
	}

	/**
	* Adds the specified (signed) amount of time to the given time field.
	* @param field the time field.
	* @param amount the amount of date or time to be added to the field.
	*/
	@Override
	public void add(int field, int amount)
	{
	int savedYearOffset = yearOffset;
	// To let the superclass calculate date-time values correctly,
	// temporarily make this GregorianCalendar.
	yearOffset = 0;
	try {
	super.add(field, amount);
	} finally {
	yearOffset = savedYearOffset;
	}
	}

	/**
	* Add to field a signed amount without changing larger fields.
	* A negative roll amount means to subtract from field without changing
	* larger fields.
	* @param field the time field.
	* @param amount the signed amount to add to <code>field</code>.
	*/
	@Override
	public void roll(int field, int amount)
	{
	int savedYearOffset = yearOffset;
	// To let the superclass calculate date-time values correctly,
	// temporarily make this GregorianCalendar.
	yearOffset = 0;
	try {
	super.roll(field, amount);
	} finally {
	yearOffset = savedYearOffset;
	}
	}

	@Override
	public String getDisplayName(int field, int style, Locale locale) {
	if (field != ERA) {
	return super.getDisplayName(field, style, locale);
	}

	return CalendarDataUtility.retrieveFieldValueName("buddhist", field, get(field), style, locale);
	}

	@Override
	public Map<String,Integer> getDisplayNames(int field, int style, Locale locale) {
	if (field != ERA) {
	return super.getDisplayNames(field, style, locale);
	}
	return CalendarDataUtility.retrieveFieldValueNames("buddhist", field, style, locale);
	}

	/**
	* Returns the maximum value that this field could have, given the
	* current date. For example, with the date "Feb 3, 2540" and the
	* <code>DAY_OF_MONTH</code> field, the actual maximum is 28; for
	* "Feb 3, 2539" it is 29.
	*
	* @param field the field to determine the maximum of
	* @return the maximum of the given field for the current date of this Calendar
	*/
	@Override
	public int getActualMaximum(int field) {
	int savedYearOffset = yearOffset;
	// To let the superclass calculate date-time values correctly,
	// temporarily make this GregorianCalendar.
	yearOffset = 0;
	try {
	return super.getActualMaximum(field);
	} finally {
	yearOffset = savedYearOffset;
	}
	}

	@Override
	@SuppressWarnings("empty-statement")
	public String toString() {
	// The super class produces a String with the Gregorian year
	// value (or '?')
	String s = super.toString();
	// If the YEAR field is UNSET, then return the Gregorian string.
	if (!isSet(YEAR)) {
	return s;
	}

	final String yearField = "YEAR=";
	int p = s.indexOf(yearField);
	// If the string doesn't include the year value for some
	// reason, then return the Gregorian string.
	if (p == -1) {
	return s;
	}
	p += yearField.length();
	StringBuilder sb = new StringBuilder(s.length() + 10);
	sb.append(s, 0, p);
	// Skip the year number
	while (Character.isDigit(s.charAt(p++)))
	;
	int year = internalGet(YEAR) + BUDDHIST_YEAR_OFFSET;
	sb.append(year).append(s, p - 1, s.length());
	return sb.toString();
	}

	private transient int yearOffset = BUDDHIST_YEAR_OFFSET;

	@java.io.Serial
	private void readObject(ObjectInputStream stream)
	throws IOException, ClassNotFoundException {
	stream.defaultReadObject();
	yearOffset = BUDDHIST_YEAR_OFFSET;
	}
	}

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