Module org.threeten.extra
Package org.threeten.extra.chrono

Class EthiopicChronology

  • All Implemented Interfaces:
    Serializable, Comparable<Chronology>, Chronology
    public final class EthiopicChronology
extends AbstractChronology
implements Serializable
    The Ethiopic calendar system.

    This chronology defines the rules of the Ethiopic calendar system. This calendar system is primarily used in Ethiopia. Dates are aligned such that 0001-01-01 (Ethiopic) is 0284-08-29 (ISO).

    The fields are defined as follows:

    • era - There are two eras, the current 'Incarnation Era' (INCARNATION) and the previous era (BEFORE_INCARNATION).
    • year-of-era - The year-of-era for the current era increases uniformly from the epoch at year one. For the previous era the year increases from one as time goes backwards.
    • proleptic-year - The proleptic year is the same as the year-of-era for the current era. For the previous era, years have zero, then negative values.
    • month-of-year - There are 13 months in a Ethiopic year, numbered from 1 to 13.
    • day-of-month - There are 30 days in each of the first 12 Ethiopic months, numbered 1 to 30. The 13th month has 5 days, or 6 in a leap year, numbered 1 to 5 or 1 to 6.
    • day-of-year - There are 365 days in a standard Ethiopic year and 366 in a leap year. The days are numbered from 1 to 365 or 1 to 366.
    • leap-year - Leap years occur every 4 years.

    Implementation Requirements

    This class is immutable and thread-safe.
    See Also:
    Serialized Form

    • Field Detail

      • INSTANCE

        public static final EthiopicChronology INSTANCE
        Singleton instance for the Ethiopic chronology.

    • Constructor Detail

      • EthiopicChronology

        @Deprecated
public EthiopicChronology()
        Deprecated.
        Use the singleton INSTANCE instead.
        Private constructor, that is public to satisfy the ServiceLoader.

    • Method Detail

      • getId

        public String getId()
        Gets the ID of the chronology - 'Ethiopic'.

        The ID uniquely identifies the Chronology. It can be used to lookup the Chronology using Chronology.of(String).

        Specified by:
        getId in interface Chronology
        Returns:
        the chronology ID - 'Ethiopic'
        See Also:
        getCalendarType()

      • getCalendarType

        public String getCalendarType()
        Gets the calendar type of the underlying calendar system - 'ethiopic'.

        The calendar type is an identifier defined by the Unicode Locale Data Markup Language (LDML) specification. It can be used to lookup the Chronology using Chronology.of(String). It can also be used as part of a locale, accessible via Locale.getUnicodeLocaleType(String) with the key 'ca'.

        Specified by:
        getCalendarType in interface Chronology
        Returns:
        the calendar system type - 'ethiopic'
        See Also:
        getId()

      • date

        public EthiopicDate date​(Era era,
                         int yearOfEra,
                         int month,
                         int dayOfMonth)
        Obtains a local date in Ethiopic calendar system from the era, year-of-era, month-of-year and day-of-month fields.
        Specified by:
        date in interface Chronology
        Parameters:
        era - the Ethiopic era, not null
        yearOfEra - the year-of-era
        month - the month-of-year
        dayOfMonth - the day-of-month
        Returns:
        the Ethiopic local date, not null
        Throws:
        DateTimeException - if unable to create the date
        ClassCastException - if the era is not a EthiopicEra

      • date

        public EthiopicDate date​(int prolepticYear,
                         int month,
                         int dayOfMonth)
        Obtains a local date in Ethiopic calendar system from the proleptic-year, month-of-year and day-of-month fields.
        Specified by:
        date in interface Chronology
        Parameters:
        prolepticYear - the proleptic-year
        month - the month-of-year
        dayOfMonth - the day-of-month
        Returns:
        the Ethiopic local date, not null
        Throws:
        DateTimeException - if unable to create the date

      • dateYearDay

        public EthiopicDate dateYearDay​(Era era,
                                int yearOfEra,
                                int dayOfYear)
        Obtains a local date in Ethiopic calendar system from the era, year-of-era and day-of-year fields.
        Specified by:
        dateYearDay in interface Chronology
        Parameters:
        era - the Ethiopic era, not null
        yearOfEra - the year-of-era
        dayOfYear - the day-of-year
        Returns:
        the Ethiopic local date, not null
        Throws:
        DateTimeException - if unable to create the date
        ClassCastException - if the era is not a EthiopicEra

      • dateYearDay

        public EthiopicDate dateYearDay​(int prolepticYear,
                                int dayOfYear)
        Obtains a local date in Ethiopic calendar system from the proleptic-year and day-of-year fields.
        Specified by:
        dateYearDay in interface Chronology
        Parameters:
        prolepticYear - the proleptic-year
        dayOfYear - the day-of-year
        Returns:
        the Ethiopic local date, not null
        Throws:
        DateTimeException - if unable to create the date

      • dateEpochDay

        public EthiopicDate dateEpochDay​(long epochDay)
        Obtains a local date in the Ethiopic calendar system from the epoch-day.
        Specified by:
        dateEpochDay in interface Chronology
        Parameters:
        epochDay - the epoch day
        Returns:
        the Ethiopic local date, not null
        Throws:
        DateTimeException - if unable to create the date

      • dateNow

        public EthiopicDate dateNow()
        Obtains the current Ethiopic local date from the system clock in the default time-zone.

        This will query the system clock in the default time-zone to obtain the current date.

        Using this method will prevent the ability to use an alternate clock for testing because the clock is hard-coded.

        Specified by:
        dateNow in interface Chronology
        Returns:
        the current Ethiopic local date using the system clock and default time-zone, not null
        Throws:
        DateTimeException - if unable to create the date

      • dateNow

        public EthiopicDate dateNow​(ZoneId zone)
        Obtains the current Ethiopic local date from the system clock in the specified time-zone.

        This will query the system clock to obtain the current date. Specifying the time-zone avoids dependence on the default time-zone.

        Using this method will prevent the ability to use an alternate clock for testing because the clock is hard-coded.

        Specified by:
        dateNow in interface Chronology
        Parameters:
        zone - the zone ID to use, not null
        Returns:
        the current Ethiopic local date using the system clock, not null
        Throws:
        DateTimeException - if unable to create the date

      • dateNow

        public EthiopicDate dateNow​(Clock clock)
        Obtains the current Ethiopic local date from the specified clock.

        This will query the specified clock to obtain the current date - today. Using this method allows the use of an alternate clock for testing. The alternate clock may be introduced using dependency injection.

        Specified by:
        dateNow in interface Chronology
        Parameters:
        clock - the clock to use, not null
        Returns:
        the current Ethiopic local date, not null
        Throws:
        DateTimeException - if unable to create the date

      • date

        public EthiopicDate date​(TemporalAccessor temporal)
        Obtains a Ethiopic local date from another date-time object.
        Specified by:
        date in interface Chronology
        Parameters:
        temporal - the date-time object to convert, not null
        Returns:
        the Ethiopic local date, not null
        Throws:
        DateTimeException - if unable to create the date

      • zonedDateTime

        public ChronoZonedDateTime<EthiopicDate> zonedDateTime​(Instant instant,
                                                       ZoneId zone)
        Obtains a Ethiopic zoned date-time in this chronology from an Instant.
        Specified by:
        zonedDateTime in interface Chronology
        Parameters:
        instant - the instant to create the date-time from, not null
        zone - the time-zone, not null
        Returns:
        the Ethiopic zoned date-time, not null
        Throws:
        DateTimeException - if the result exceeds the supported range

      • isLeapYear

        public boolean isLeapYear​(long prolepticYear)
        Checks if the specified year is a leap year.

        The proleptic-year is leap if the remainder after division by four equals three. This method does not validate the year passed in, and only has a well-defined result for years in the supported range.

        Parameters:
        prolepticYear - the proleptic-year to check, not validated for range
        Returns:
        true if the year is a leap year