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	/*
	* Copyright (c) 2005, 2018, 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.calendar;

	import java.security.AccessController;
	import java.util.TimeZone;
	import java.util.regex.Matcher;
	import java.util.regex.Pattern;
	import sun.security.action.GetPropertyAction;

	/**
	*
	* @author Masayoshi Okutsu
	* @since 1.6
	*/

	public class LocalGregorianCalendar extends BaseCalendar {
	private static final Era[] JAPANESE_ERAS = {
	new Era("Meiji", "M", -3218832000000L, true),
	new Era("Taisho", "T", -1812153600000L, true),
	new Era("Showa", "S", -1357603200000L, true),
	new Era("Heisei", "H", 600220800000L, true),
	new Era("NewEra", "N", 1556668800000L, true),
	};

	private static boolean isValidEra(Era newEra, Era[] eras) {
	Era last = eras[eras.length - 1];
	if (last.getSince(null) >= newEra.getSince(null)) {
	return false;
	}
	// The new era name should be unique. Its abbr may not.
	String newName = newEra.getName();
	for (Era era : eras) {
	if (era.getName().equals(newName)) {
	return false;
	}
	}
	return true;
	}

	private String name;
	private Era[] eras;

	public static class Date extends BaseCalendar.Date {

	protected Date() {
	super();
	}

	protected Date(TimeZone zone) {
	super(zone);
	}

	private int gregorianYear = FIELD_UNDEFINED;

	@Override
	public Date setEra(Era era) {
	if (getEra() != era) {
	super.setEra(era);
	gregorianYear = FIELD_UNDEFINED;
	}
	return this;
	}

	@Override
	public Date addYear(int localYear) {
	super.addYear(localYear);
	gregorianYear += localYear;
	return this;
	}

	@Override
	public Date setYear(int localYear) {
	if (getYear() != localYear) {
	super.setYear(localYear);
	gregorianYear = FIELD_UNDEFINED;
	}
	return this;
	}

	@Override
	public int getNormalizedYear() {
	return gregorianYear;
	}

	@Override
	public void setNormalizedYear(int normalizedYear) {
	this.gregorianYear = normalizedYear;
	}

	void setLocalEra(Era era) {
	super.setEra(era);
	}

	void setLocalYear(int year) {
	super.setYear(year);
	}

	@Override
	public String toString() {
	String time = super.toString();
	time = time.substring(time.indexOf('T'));
	StringBuffer sb = new StringBuffer();
	Era era = getEra();
	if (era != null) {
	String abbr = era.getAbbreviation();
	if (abbr != null) {
	sb.append(abbr);
	}
	}
	sb.append(getYear()).append('.');
	CalendarUtils.sprintf0d(sb, getMonth(), 2).append('.');
	CalendarUtils.sprintf0d(sb, getDayOfMonth(), 2);
	sb.append(time);
	return sb.toString();
	}
	}

	static LocalGregorianCalendar getLocalGregorianCalendar(String name) {
	// Only the Japanese calendar is supported.
	if (!"japanese".equals(name)) {
	return null;
	}

	// Append an era to the predefined eras if it's given by the property.
	String prop = GetPropertyAction
	.privilegedGetProperty("jdk.calendar.japanese.supplemental.era");
	if (prop != null) {
	Era era = parseEraEntry(prop);
	if (era != null) {
	if (isValidEra(era, JAPANESE_ERAS)) {
	int length = JAPANESE_ERAS.length;
	Era[] eras = new Era[length + 1];
	System.arraycopy(JAPANESE_ERAS, 0, eras, 0, length);
	eras[length] = era;
	return new LocalGregorianCalendar(name, eras);
	}
	}
	}
	return new LocalGregorianCalendar(name, JAPANESE_ERAS);
	}

	private static Era parseEraEntry(String entry) {
	String[] keyValuePairs = entry.split(",");
	String eraName = null;
	boolean localTime = true;
	long since = 0;
	String abbr = null;

	for (String item : keyValuePairs) {
	String[] keyvalue = item.split("=");
	if (keyvalue.length != 2) {
	return null;
	}
	String key = keyvalue[0].trim();
	String value = convertUnicodeEscape(keyvalue[1].trim());
	switch (key) {
	case "name":
	eraName = value;
	break;
	case "since":
	if (value.endsWith("u")) {
	localTime = false;
	value = value.substring(0, value.length() - 1);
	}
	try {
	since = Long.parseLong(value);
	} catch (NumberFormatException e) {
	return null;
	}
	break;
	case "abbr":
	abbr = value;
	break;
	default:
	return null;
	}
	}
	if (eraName == null \|\| eraName.isEmpty()
	\|\| abbr == null \|\| abbr.isEmpty()) {
	return null;
	}
	return new Era(eraName, abbr, since, localTime);
	}

	private static String convertUnicodeEscape(String src) {
	Matcher m = Pattern.compile("\\\\u([0-9a-fA-F]{4})").matcher(src);
	StringBuilder sb = new StringBuilder();
	while (m.find()) {
	m.appendReplacement(sb,
	Character.toString((char)Integer.parseUnsignedInt(m.group(1), 16)));
	}
	m.appendTail(sb);
	return sb.toString();
	}

	private LocalGregorianCalendar(String name, Era[] eras) {
	this.name = name;
	this.eras = eras;
	setEras(eras);
	}

	@Override
	public String getName() {
	return name;
	}

	@Override
	public Date getCalendarDate() {
	return getCalendarDate(System.currentTimeMillis(), newCalendarDate());
	}

	@Override
	public Date getCalendarDate(long millis) {
	return getCalendarDate(millis, newCalendarDate());
	}

	@Override
	public Date getCalendarDate(long millis, TimeZone zone) {
	return getCalendarDate(millis, newCalendarDate(zone));
	}

	@Override
	public Date getCalendarDate(long millis, CalendarDate date) {
	Date ldate = (Date) super.getCalendarDate(millis, date);
	return adjustYear(ldate, millis, ldate.getZoneOffset());
	}

	private Date adjustYear(Date ldate, long millis, int zoneOffset) {
	int i;
	for (i = eras.length - 1; i >= 0; --i) {
	Era era = eras[i];
	long since = era.getSince(null);
	if (era.isLocalTime()) {
	since -= zoneOffset;
	}
	if (millis >= since) {
	ldate.setLocalEra(era);
	int y = ldate.getNormalizedYear() - era.getSinceDate().getYear() + 1;
	ldate.setLocalYear(y);
	break;
	}
	}
	if (i < 0) {
	ldate.setLocalEra(null);
	ldate.setLocalYear(ldate.getNormalizedYear());
	}
	ldate.setNormalized(true);
	return ldate;
	}

	@Override
	public Date newCalendarDate() {
	return new Date();
	}

	@Override
	public Date newCalendarDate(TimeZone zone) {
	return new Date(zone);
	}

	@Override
	public boolean validate(CalendarDate date) {
	Date ldate = (Date) date;
	Era era = ldate.getEra();
	if (era != null) {
	if (!validateEra(era)) {
	return false;
	}
	ldate.setNormalizedYear(era.getSinceDate().getYear() + ldate.getYear() - 1);
	Date tmp = newCalendarDate(date.getZone());
	tmp.setEra(era).setDate(date.getYear(), date.getMonth(), date.getDayOfMonth());
	normalize(tmp);
	if (tmp.getEra() != era) {
	return false;
	}
	} else {
	if (date.getYear() >= eras[0].getSinceDate().getYear()) {
	return false;
	}
	ldate.setNormalizedYear(ldate.getYear());
	}
	return super.validate(ldate);
	}

	private boolean validateEra(Era era) {
	for (Era era1 : eras) {
	if (era == era1) {
	return true;
	}
	}
	return false;
	}

	@Override
	public boolean normalize(CalendarDate date) {
	if (date.isNormalized()) {
	return true;
	}

	normalizeYear(date);
	Date ldate = (Date) date;

	// Normalize it as a Gregorian date and get its millisecond value
	super.normalize(ldate);

	boolean hasMillis = false;
	long millis = 0;
	int year = ldate.getNormalizedYear();
	int i;
	Era era = null;
	for (i = eras.length - 1; i >= 0; --i) {
	era = eras[i];
	if (era.isLocalTime()) {
	CalendarDate sinceDate = era.getSinceDate();
	int sinceYear = sinceDate.getYear();
	if (year > sinceYear) {
	break;
	}
	if (year == sinceYear) {
	int month = ldate.getMonth();
	int sinceMonth = sinceDate.getMonth();
	if (month > sinceMonth) {
	break;
	}
	if (month == sinceMonth) {
	int day = ldate.getDayOfMonth();
	int sinceDay = sinceDate.getDayOfMonth();
	if (day > sinceDay) {
	break;
	}
	if (day == sinceDay) {
	long timeOfDay = ldate.getTimeOfDay();
	long sinceTimeOfDay = sinceDate.getTimeOfDay();
	if (timeOfDay >= sinceTimeOfDay) {
	break;
	}
	--i;
	break;
	}
	}
	}
	} else {
	if (!hasMillis) {
	millis = super.getTime(date);
	hasMillis = true;
	}

	long since = era.getSince(date.getZone());
	if (millis >= since) {
	break;
	}
	}
	}
	if (i >= 0) {
	ldate.setLocalEra(era);
	@SuppressWarnings("null")
	int y = ldate.getNormalizedYear() - era.getSinceDate().getYear() + 1;
	ldate.setLocalYear(y);
	} else {
	// Set Gregorian year with no era
	ldate.setEra(null);
	ldate.setLocalYear(year);
	ldate.setNormalizedYear(year);
	}
	ldate.setNormalized(true);
	return true;
	}

	@Override
	void normalizeMonth(CalendarDate date) {
	normalizeYear(date);
	super.normalizeMonth(date);
	}

	void normalizeYear(CalendarDate date) {
	Date ldate = (Date) date;
	// Set the supposed-to-be-correct Gregorian year first
	// e.g., Showa 90 becomes 2015 (1926 + 90 - 1).
	Era era = ldate.getEra();
	if (era == null \|\| !validateEra(era)) {
	ldate.setNormalizedYear(ldate.getYear());
	} else {
	ldate.setNormalizedYear(era.getSinceDate().getYear() + ldate.getYear() - 1);
	}
	}

	/**
	* Returns whether the specified Gregorian year is a leap year.
	* @see #isLeapYear(Era, int)
	*/
	@Override
	public boolean isLeapYear(int gregorianYear) {
	return CalendarUtils.isGregorianLeapYear(gregorianYear);
	}

	public boolean isLeapYear(Era era, int year) {
	if (era == null) {
	return isLeapYear(year);
	}
	int gyear = era.getSinceDate().getYear() + year - 1;
	return isLeapYear(gyear);
	}

	@Override
	public void getCalendarDateFromFixedDate(CalendarDate date, long fixedDate) {
	Date ldate = (Date) date;
	super.getCalendarDateFromFixedDate(ldate, fixedDate);
	adjustYear(ldate, (fixedDate - EPOCH_OFFSET) * DAY_IN_MILLIS, 0);
	}
	}

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