Module org.threeten.extra

Package org.threeten.extra.chrono

Class Symmetry454Chronology

java.lang.Object

java.time.chrono.AbstractChronology

org.threeten.extra.chrono.Symmetry454Chronology

All Implemented Interfaces:

Serializable, Comparable<Chronology>, Chronology

public final class Symmetry454Chronology
extends AbstractChronology
implements Serializable

The Symmetry454 calendar system.

This chronology defines the rules of the Symmetry454 calendar system. Dates are aligned such that 0001/01/01 (Sym454) is 0001-01-01 (ISO).

The calendar implemented by this class is proleptic, with January 1st as the start of the year. Each month either has 28 days or 35 days, in an alternating pattern; January has 28 days, February has 35 days and March again has 28 days. Due to this, each quarter consists of 13 weeks.

Normal years thus have 364 days, whereas leap years have an extra week, aptly called leap week, added to the end, extending the year to 371 days.

The fields are defined as follows:

• era - Same eras as used in the Gregorian calendar: 'Before Common Era' (BCE) and 'Common Era' (CE).
• year-of-era - The year-of-era for the current era increases uniformly from the epoch at year 1.
• proleptic-year - The proleptic year is the same as the year-of-era for the current era.
• month-of-year - There are 12 months in an Symmetry454 year, numbered from 1 to 12.
• day-of-month - There are 28 days in a standard Symmetry454 month, numbered from 1 to 28, except for the middle-month in each quarter, which spans 35 days: February, May, August, November; and December in leap years.
• day-of-year - There are 364 days in a standard Symmetry454 year and 371 days in a leap year. The days are numbered accordingly.
• leap-year - Leap years occur every 5 or 6 years, evenly spread over 293 years according the formula: (52 > ((52 * year + 146) % 293)).
• Week day - every month starts on a Monday. There are no days outside of the week or month.

Implementation Requirements

This class is immutable and thread-safe.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static long	DAYS_0001_TO_1970	The number of days from year zero to CE 1970, still the era only allows CE 1 and higher.
static Symmetry454Chronology	INSTANCE	Singleton instance for the Symmetry454 chronology.

Constructor Summary

Constructors

Constructor	Description
Symmetry454Chronology()	Deprecated. Use the singleton INSTANCE instead.

Method Summary

Modifier and Type	Method	Description
Symmetry454Date	date(int prolepticYear, int month, int dayOfMonth)	Obtains a local date in Symmetry454 calendar system from the proleptic-year, month-of-year and day-of-month fields.
Symmetry454Date	date(Era era, int yearOfEra, int month, int dayOfMonth)	Obtains a local date in Symmetry454 calendar system from the era, year-of-era, month-of-year and day-of-month fields.
Symmetry454Date	date(TemporalAccessor temporal)	Obtains a Symmetry454 local date from another date-time object.
Symmetry454Date	dateEpochDay(long epochDay)	Obtains a local date in the Symmetry454 calendar system from the epoch-day.
Symmetry454Date	dateNow()	Obtains the current Symmetry454 local date from the system clock in the default time-zone.
Symmetry454Date	dateNow(Clock clock)	Obtains the current Symmetry454 local date from the specified clock.
Symmetry454Date	dateNow(ZoneId zone)	Obtains the current Symmetry454 local date from the system clock in the specified time-zone.
Symmetry454Date	dateYearDay(int prolepticYear, int dayOfYear)	Obtains a local date in Symmetry454 calendar system from the proleptic-year and day-of-year fields.
Symmetry454Date	dateYearDay(Era era, int yearOfEra, int dayOfYear)	Obtains a local date in Symmetry454 calendar system from the era, year-of-era and day-of-year fields.
IsoEra	eraOf(int eraValue)	Creates the chronology era object from the numeric value.
List<Era>	eras()	Gets the list of eras for the chronology.
String	getCalendarType()	Gets the calendar type of the underlying calendar system, which returns null.
String	getId()	Gets the ID of the chronology - 'Sym454'.
static long	getLeapYearsBefore(long prolepticYear)	Get the count of leap years since CE 1.
boolean	isLeapYear(long year)	Checks if the specified year is a leap year.
ChronoLocalDateTime<Symmetry454Date>	localDateTime(TemporalAccessor temporal)	Obtains a Symmetry454 local date-time from another date-time object.
int	prolepticYear(Era era, int yearOfEra)
ValueRange	range(ChronoField field)
ChronoZonedDateTime<Symmetry454Date>	zonedDateTime(Instant instant, ZoneId zone)	Obtains a Symmetry454 zoned date-time in this chronology from an Instant.
ChronoZonedDateTime<Symmetry454Date>	zonedDateTime(TemporalAccessor temporal)	Obtains a Symmetry454 zoned date-time from another date-time object.

Methods inherited from class java.time.chrono.AbstractChronology

compareTo, equals, hashCode, resolveDate, toString

Methods inherited from interface java.time.chrono.Chronology

epochSecond, epochSecond, from, getDisplayName, period

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

INSTANCE

public static final Symmetry454Chronology INSTANCE

Singleton instance for the Symmetry454 chronology.

DAYS_0001_TO_1970

public static final long DAYS_0001_TO_1970

The number of days from year zero to CE 1970, still the era only allows CE 1 and higher. There are 6 full 293-year cycles from CE 1 to 1758, with 6 * 52 leap years, i.e. 312. There are 37 leap years from CE 1758 to 1970.

See Also:

Constant Field Values

Constructor Detail

Symmetry454Chronology

@Deprecated
public Symmetry454Chronology()

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 - 'Sym454'.

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 - 'Sym454'

See Also:

getCalendarType()

getCalendarType

public String getCalendarType()

Gets the calendar type of the underlying calendar system, which returns null.

The Unicode Locale Data Markup Language (LDML) specification does not define an identifier for this calendar system, thus null is returned.

Specified by:

getCalendarType in interface Chronology

Returns:

the calendar system type, null

See Also:

getId()

date

public Symmetry454Date date(Era era,
                            int yearOfEra,
                            int month,
                            int dayOfMonth)

Obtains a local date in Symmetry454 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 Symmetry454 era, not null

yearOfEra - the year-of-era

month - the month-of-year

dayOfMonth - the day-of-month

Returns:

the Symmetry454 local date, not null

Throws:

DateTimeException - if unable to create the date

ClassCastException - if the era is not a IsoEra

date

public Symmetry454Date date(int prolepticYear,
                            int month,
                            int dayOfMonth)

Obtains a local date in Symmetry454 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 Symmetry454 local date, not null

Throws:

DateTimeException - if unable to create the date

dateYearDay

public Symmetry454Date dateYearDay(Era era,
                                   int yearOfEra,
                                   int dayOfYear)

Obtains a local date in Symmetry454 calendar system from the era, year-of-era and day-of-year fields.

Specified by:

dateYearDay in interface Chronology

Parameters:

era - the Symmetry454 era, not null

yearOfEra - the year-of-era

dayOfYear - the day-of-year

Returns:

the Symmetry454 local date, not null

Throws:

DateTimeException - if unable to create the date

ClassCastException - if the era is not a IsoEra

dateYearDay

public Symmetry454Date dateYearDay(int prolepticYear,
                                   int dayOfYear)

Obtains a local date in Symmetry454 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 Symmetry454 local date, not null

Throws:

DateTimeException - if unable to create the date

dateEpochDay

public Symmetry454Date dateEpochDay(long epochDay)

Obtains a local date in the Symmetry454 calendar system from the epoch-day.

Specified by:

dateEpochDay in interface Chronology

Parameters:

epochDay - the epoch day

Returns:

the Symmetry454 local date, not null

Throws:

DateTimeException - if unable to create the date

dateNow

public Symmetry454Date dateNow()

Obtains the current Symmetry454 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 Symmetry454 local date using the system clock and default time-zone, not null

Throws:

DateTimeException - if unable to create the date

dateNow

public Symmetry454Date dateNow(ZoneId zone)

Obtains the current Symmetry454 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 Symmetry454 local date using the system clock, not null

Throws:

DateTimeException - if unable to create the date

dateNow

public Symmetry454Date dateNow(Clock clock)

Obtains the current Symmetry454 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 Symmetry454 local date, not null

Throws:

DateTimeException - if unable to create the date

date

public Symmetry454Date date(TemporalAccessor temporal)

Obtains a Symmetry454 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 Symmetry454 local date, not null

Throws:

DateTimeException - if unable to create the date

localDateTime

public ChronoLocalDateTime<Symmetry454Date> localDateTime(TemporalAccessor temporal)

Obtains a Symmetry454 local date-time from another date-time object.

Specified by:

localDateTime in interface Chronology

Parameters:

temporal - the date-time object to convert, not null

Returns:

the Symmetry454 local date-time, not null

Throws:

DateTimeException - if unable to create the date-time

zonedDateTime

public ChronoZonedDateTime<Symmetry454Date> zonedDateTime(TemporalAccessor temporal)

Obtains a Symmetry454 zoned date-time from another date-time object.

Specified by:

zonedDateTime in interface Chronology

Parameters:

temporal - the date-time object to convert, not null

Returns:

the Symmetry454 zoned date-time, not null

Throws:

DateTimeException - if unable to create the date-time

zonedDateTime

public ChronoZonedDateTime<Symmetry454Date> zonedDateTime(Instant instant,
                                                          ZoneId zone)

Obtains a Symmetry454 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 Symmetry454 zoned date-time, not null

Throws:

DateTimeException - if the result exceeds the supported range

isLeapYear

public boolean isLeapYear(long year)

Checks if the specified year is a leap year.

A leap-year is a year of a longer length than normal. Leap years in the calendar system match those of the ISO calendar system.

Specified by:

isLeapYear in interface Chronology

Parameters:

year - the proleptic-year to check, not validated for range

Returns:

true if the year is a leap year

eraOf

public IsoEra eraOf(int eraValue)

Creates the chronology era object from the numeric value.

The list of eras is shared with IsoEra.

Specified by:

eraOf in interface Chronology

Parameters:

eraValue - the era value

Returns:

the calendar system era, not null

Throws:

DateTimeException - if unable to create the era

eras

public List<Era> eras()

Gets the list of eras for the chronology.

The list of eras is shared with IsoEra.

Specified by:

eras in interface Chronology

Returns:

the list of eras for the chronology, may be immutable, not null

range

public ValueRange range(ChronoField field)

Specified by:

range in interface Chronology

prolepticYear

public int prolepticYear(Era era,
                         int yearOfEra)

Specified by:

prolepticYear in interface Chronology

getLeapYearsBefore

public static long getLeapYearsBefore(long prolepticYear)

Get the count of leap years since CE 1.

Parameters:

prolepticYear - the year

Returns:

the number of leap years since CE 1