import java.io.File;

import java.io.FileInputStream;

import java.io.InputStream;

import java.security.AccessController;

import java.security.PrivilegedActionException;

import java.util.Map;

import java.util.Objects;

import java.util.Properties;

import sun.util.logging.PlatformLogger;

 * The Hijrah calendar is a lunar calendar supporting Islamic calendars.

 * The HijrahChronology follows the rules of the Hijrah calendar system. The Hijrah

 * calendar has several variants based on differences in when the new moon is

 * determined to have occurred and where the observation is made.

 * In some variants the length of each month is

 * computed algorithmically from the astronomical data for the moon and earth and

 * in others the length of the month is determined by an authorized sighting

 * of the new moon. For the algorithmically based calendars the calendar

 * can project into the future.

 * For sighting based calendars only historical data from past

 * sightings is available.

 * <p>

 * The length of each month is 29 or 30 days.

 * Ordinary years have 354 days; leap years have 355 days.

 *

 * CLDR and LDML identify variants:

 * <table cellpadding="2" summary="Variants of Hijrah Calendars">

 * <thead>

 * <tr class="tableSubHeadingColor">

 * <th class="colFirst" align="left" >Chronology ID</th>

 * <th class="colFirst" align="left" >Calendar Type</th>

 * <th class="colFirst" align="left" >Locale extension, see {@link java.util.Locale}</th>

 * <th class="colLast" align="left" >Description</th>

 * </tr>

 * </thead>

 * <tbody>

 * <tr class="altColor">

 * <td>Hijrah-umalqura</td>

 * <td>islamic-umalqura</td>

 * <td>ca-islamic-cv-umalqura</td>

 * <td>Islamic - Umm Al-Qura calendar of Saudi Arabia</td>

 * </tr>

 * </tbody>

 * <p>Additional variants may be available through {@link Chronology#getAvailableChronologies()}.

 *

 * <p>Example</p>

 * Selecting the chronology from the locale uses {@link Chronology#ofLocale}

 * to find the Chronology based on Locale supported BCP 47 extension mechanism

 * to request a specific calendar ("ca") and variant ("cv"). For example,

 * </p>

 * <pre>

 *      Locale locale = Locale.forLanguageTag("en-US-u-ca-islamic-cv-umalqura");

 *      Chronology chrono = Chronology.ofLocale(locale);

 * </pre>

 * <h3>Implementation Note for Hijrah Calendar Variant Configuration</h3>

 * Each Hijrah variant is configured individually. Each variant is defined by a

 * property resource that defines the {@code ID}, the {@code calendar type},

 * the start of the calendar, the alignment with the

 * ISO calendar, and the length of each month for a range of years.

 * The variants are identified in the {@code calendars.properties} file.

 * The new properties are prefixed with {@code "calendars.hijrah."}:

 * <table cellpadding="2" border="0" summary="Configuration of Hijrah Calendar Variants">

 * <thead>

 * <tr class="tableSubHeadingColor">

 * <th class="colFirst" align="left">Property Name</th>

 * <th class="colFirst" align="left">Property value</th>

 * <th class="colLast" align="left">Description </th>

 * </tr>

 * </thead>

 * <tbody>

 * <tr class="altColor">

 * <td>calendars.hijrah.{ID}</td>

 * <td>The property resource defining the {@code {ID}} variant</td>

 * <td>The property resource is located with the {@code calendars.properties} file</td>

 * </tr>

 * <tr class="rowColor">

 * <td>calendars.hijrah.{ID}.type</td>

 * <td>The calendar type</td>

 * <td>LDML defines the calendar type names</td>

 * </tr>

 * </tbody>

 * </table>

 * <p>

 * The Hijrah property resource is a set of properties that describe the calendar.

 * The syntax is defined by {@code java.util.Properties#load(Reader)}.

 * <table cellpadding="2" summary="Configuration of Hijrah Calendar">

 * <thead>

 * <tr class="tableSubHeadingColor">

 * <th class="colFirst" align="left" > Property Name</th>

 * <th class="colFirst" align="left" > Property value</th>

 * <th class="colLast" align="left" > Description </th>

 * </tr>

 * </thead>

 * <tbody>

 * <tr class="altColor">

 * <td>id</td>

 * <td>Chronology Id, for example, "Hijrah-umalqura"</td>

 * <td>The Id of the calendar in common usage</td>

 * </tr>

 * <tr class="rowColor">

 * <td>type</td>

 * <td>Calendar type, for example, "islamic-umalqura"</td>

 * <td>LDML defines the calendar types</td>

 * </tr>

 * <tr class="altColor">

 * <td>version</td>

 * <td>Version, for example: "1.8.0_1"</td>

 * <td>The version of the Hijrah variant data</td>

 * </tr>

 * <tr class="rowColor">

 * <td>iso-start</td>

 * <td>ISO start date, formatted as {@code yyyy-MM-dd}, for example: "1900-04-30"</td>

 * <td>The ISO date of the first day of the minimum Hijrah year.</td>

 * </tr>

 * <tr class="altColor">

 * <td>yyyy - a numeric 4 digit year, for example "1434"</td>

 * <td>The value is a sequence of 12 month lengths,

 * for example: "29 30 29 30 29 30 30 30 29 30 29 29"</td>

 * <td>The lengths of the 12 months of the year separated by whitespace.

 * A numeric year property must be present for every year without any gaps.

 * The month lengths must be between 29-32 inclusive.

 * </td>

 * </tr>

 * </tbody>

 * </table>

    private transient final String calendarType;

     * Singleton instance of the Islamic Umm Al-Qura calendar of Saudi Arabia.

     * Other Hijrah chronology variants may be available from

     * {@link Chronology#getAvailableChronologies}.

    public static final HijrahChronology INSTANCE;

     * Array of epoch days indexed by Hijrah Epoch month.

     * Computed by {@link #loadCalendarData}.

    private transient int[] hijrahEpochMonthStartDays;

     * The minimum epoch day of this Hijrah calendar.

     * Computed by {@link #loadCalendarData}.

    private transient int minEpochDay;

     * The maximum epoch day for which calendar data is available.

     * Computed by {@link #loadCalendarData}.

    private transient int maxEpochDay;

     * The minimum epoch month.

     * Computed by {@link #loadCalendarData}.

     */

    private transient int hijrahStartEpochMonth;

    /**

     * The minimum length of a month.

     * Computed by {@link #createEpochMonths}.

     */

    private transient int minMonthLength;

    /**

     * The maximum length of a month.

     * Computed by {@link #createEpochMonths}.

    private transient int maxMonthLength;

    /**

     * The minimum length of a year in days.

     * Computed by {@link #createEpochMonths}.

     */

    private transient int minYearLength;

     * The maximum length of a year in days.

     * Computed by {@link #createEpochMonths}.

    private transient int maxYearLength;

    /**

     * A reference to the properties stored in

     * ${java.home}/lib/calendars.properties

     */

    private transient final static Properties calendarProperties;

     * Prefix of property names for Hijrah calendar variants.

    private static final String PROP_PREFIX = "calendar.hijrah.";

     * Suffix of property names containing the calendar type of a variant.

    private static final String PROP_TYPE_SUFFIX = ".type";

        try {

            calendarProperties = sun.util.calendar.BaseCalendar.getCalendarProperties();

        } catch (IOException ioe) {

            throw new InternalError("Can't initialize lib/calendars.properties", ioe);

        }

        try {

            INSTANCE = new HijrahChronology("Hijrah-umalqura");

            // Register it by its aliases

            Chronology.registerChrono(INSTANCE, "Hijrah");

            Chronology.registerChrono(INSTANCE, "islamic");

        } catch (Exception ex) {

            // Absence of Hijrah calendar is fatal to initializing this class.

            PlatformLogger logger = PlatformLogger.getLogger("java.time.chrono");

            logger.severe("Unable to initialize Hijrah calendar: Hijrah-umalqura", ex);

            throw new RuntimeException("Unable to initialize Hijrah-umalqura calendar", ex.getCause());

        }

        registerVariants();

    }

    /**

     * For each Hijrah variant listed, create the HijrahChronology and register it.

     * Exceptions during initialization are logged but otherwise ignored.

     */

    private static void registerVariants() {

        for (String name : calendarProperties.stringPropertyNames()) {

            if (name.startsWith(PROP_PREFIX)) {

                String id = name.substring(PROP_PREFIX.length());

                if (id.indexOf('.') >= 0) {

                    continue;   // no name or not a simple name of a calendar

                if (id.equals(INSTANCE.getId())) {

                    continue;           // do not duplicate the default

                }

                try {

                    // Create and register the variant

                    HijrahChronology chrono = new HijrahChronology(id);

                    Chronology.registerChrono(chrono);

                } catch (Exception ex) {

                    // Log error and continue

                    PlatformLogger logger = PlatformLogger.getLogger("java.time.chrono");

                    logger.severe("Unable to initialize Hijrah calendar: " + id, ex);

                }

     * Create a HijrahChronology for the named variant.

     * The resource and calendar type are retrieved from properties

     * in the {@code calendars.properties}.

     * The property names are {@code "calendar.hijrah." + id}

     * and  {@code "calendar.hijrah." + id + ".type"}

     * @throws Exception if the resource can not be accessed or

     *    the format is invalid

    private HijrahChronology(String id) throws Exception {

        if (id.isEmpty()) {

            throw new IllegalArgumentException("calendar id is empty");

        }

        this.calendarType = calendarProperties.getProperty(PROP_PREFIX + id + PROP_TYPE_SUFFIX);

            String resource = calendarProperties.getProperty(PROP_PREFIX + id);

            Objects.requireNonNull(resource, "Resource missing for calendar");

            loadCalendarData(resource);

        } catch (Exception ex) {

            throw new Exception("Unable to initialize HijrahCalendar: " + id, ex);

     * Gets the ID of the chronology.

     * The ID uniquely identifies the {@code Chronology}. It can be used to

     * lookup the {@code Chronology} using {@link #of(String)}.

     * @return the chronology ID, non-null

     * Gets the calendar type of the Islamic calendar.

     * @return the calendar system type; non-null if the calendar has

     *    a standard type, otherwise null

    /**

     * Obtains a local date in Hijrah calendar system from the

     * era, year-of-era, month-of-year and day-of-month fields.

     *

     * @param era  the Hijrah era, not null

     * @param yearOfEra  the year-of-era

     * @param month  the month-of-year

     * @param dayOfMonth  the day-of-month

     * @return the Hijrah local date, not null

     * @throws DateTimeException if unable to create the date

     * @throws ClassCastException if the {@code era} is not a {@code HijrahEra}

     */

    @Override

    public HijrahDate date(Era era, int yearOfEra, int month, int dayOfMonth) {

        return date(prolepticYear(era, yearOfEra), month, dayOfMonth);

    }

    /**

     * Obtains a local date in Hijrah calendar system from the

     * proleptic-year, month-of-year and day-of-month fields.

     *

     * @param prolepticYear  the proleptic-year

     * @param month  the month-of-year

     * @param dayOfMonth  the day-of-month

     * @return the Hijrah local date, not null

     * @throws DateTimeException if unable to create the date

     */

    /**

     * Obtains a local date in Hijrah calendar system from the

     * era, year-of-era and day-of-year fields.

     *

     * @param era  the Hijrah era, not null

     * @param yearOfEra  the year-of-era

     * @param dayOfYear  the day-of-year

     * @return the Hijrah local date, not null

     * @throws DateTimeException if unable to create the date

     * @throws ClassCastException if the {@code era} is not a {@code HijrahEra}

     */

    @Override

    public HijrahDate dateYearDay(Era era, int yearOfEra, int dayOfYear) {

        return dateYearDay(prolepticYear(era, yearOfEra), dayOfYear);

    }

    /**

     * Obtains a local date in Hijrah calendar system from the

     * proleptic-year and day-of-year fields.

     *

     * @param prolepticYear  the proleptic-year

     * @param dayOfYear  the day-of-year

     * @return the Hijrah local date, not null

     * @throws DateTimeException if unable to create the date

     */

    /**

     * Obtains a local date in the Hijrah calendar system from the epoch-day.

     *

     * @param epochDay  the epoch day

     * @return the Hijrah local date, not null

     * @throws DateTimeException if unable to create the date

     */

    @Override  // override with covariant return type

    public HijrahDate dateEpochDay(long epochDay) {

        return HijrahDate.ofEpochDay(this, epochDay);

    public HijrahDate date(TemporalAccessor temporal) {

        if (temporal instanceof HijrahDate) {

            return (HijrahDate) temporal;

        }

        return HijrahDate.ofEpochDay(this, temporal.getLong(EPOCH_DAY));

    }

    @Override

        return (ChronoLocalDateTime<HijrahDate>) super.localDateTime(temporal);

        return (ChronoZonedDateTime<HijrahDate>) super.zonedDateTime(temporal);