Module java.base
Package java.time.chrono

Class MinguoChronology

java.lang.Object
java.time.chrono.AbstractChronology
java.time.chrono.MinguoChronology
All Implemented Interfaces:
Serializable, Comparable<Chronology>, Chronology
public final class MinguoChronology extends AbstractChronology implements Serializable
The Minguo calendar system.

This chronology defines the rules of the Minguo calendar system. This calendar system is primarily used in the Republic of China, often known as Taiwan. Dates are aligned such that 0001-01-01 (Minguo) is 1912-01-01 (ISO).

The fields are defined as follows:

  • era - There are two eras, the current 'Republic' (ERA_ROC) and the previous era (ERA_BEFORE_ROC).
  • 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. The value for the current era is equal to the ISO proleptic-year minus 1911.
  • 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. The value is equal to the ISO proleptic-year minus 1911.
  • month-of-year - The Minguo month-of-year exactly matches ISO.
  • day-of-month - The Minguo day-of-month exactly matches ISO.
  • day-of-year - The Minguo day-of-year exactly matches ISO.
  • leap-year - The Minguo leap-year pattern exactly matches ISO, such that the two calendars are never out of step.
Implementation Requirements:
This class is immutable and thread-safe.
Since:
1.8
See Also:

  • Field Details

    • INSTANCE

      public static final MinguoChronology INSTANCE
      Singleton instance for the Minguo chronology.

  • Method Details

    • getId

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

      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 - 'Minguo'
      See Also:

    • getCalendarType

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

      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 - 'roc'
      See Also:

    • date

      public MinguoDate date(Era era, int yearOfEra, int month, int dayOfMonth)
      Obtains a local date in Minguo 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 Minguo era, not null
      yearOfEra - the year-of-era
      month - the month-of-year
      dayOfMonth - the day-of-month
      Returns:
      the Minguo local date, not null
      Throws:
      DateTimeException - if unable to create the date
      ClassCastException - if the era is not a MinguoEra

    • date

      public MinguoDate date(int prolepticYear, int month, int dayOfMonth)
      Obtains a local date in Minguo 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 Minguo local date, not null
      Throws:
      DateTimeException - if unable to create the date

    • dateYearDay

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

    • dateYearDay

      public MinguoDate dateYearDay(int prolepticYear, int dayOfYear)
      Obtains a local date in Minguo 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 Minguo local date, not null
      Throws:
      DateTimeException - if unable to create the date

    • dateEpochDay

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

    • dateNow

      public MinguoDate dateNow()
      Description copied from interface: Chronology
      Obtains the current local date in this chronology 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 local date using the system clock and default time-zone, not null

    • dateNow

      public MinguoDate dateNow(ZoneId zone)
      Description copied from interface: Chronology
      Obtains the current local date in this chronology 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 local date using the system clock, not null

    • dateNow

      public MinguoDate dateNow(Clock clock)
      Description copied from interface: Chronology
      Obtains the current local date in this chronology 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 local date, not null

    • date

      public MinguoDate date(TemporalAccessor temporal)
      Description copied from interface: Chronology
      Obtains a local date in this chronology from another temporal object.

      This obtains a date in this chronology based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of ChronoLocalDate.

      The conversion typically uses the EPOCH_DAY field, which is standardized across calendar systems.

      This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, aChronology::date.

      Specified by:
      date in interface Chronology
      Parameters:
      temporal - the temporal object to convert, not null
      Returns:
      the local date in this chronology, not null
      See Also:

    • localDateTime

      public ChronoLocalDateTime<MinguoDate> localDateTime(TemporalAccessor temporal)
      Description copied from interface: Chronology
      Obtains a local date-time in this chronology from another temporal object.

      This obtains a date-time in this chronology based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of ChronoLocalDateTime.

      The conversion extracts and combines the ChronoLocalDate and the LocalTime from the temporal object. Implementations are permitted to perform optimizations such as accessing those fields that are equivalent to the relevant objects. The result uses this chronology.

      This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, aChronology::localDateTime.

      Specified by:
      localDateTime in interface Chronology
      Parameters:
      temporal - the temporal object to convert, not null
      Returns:
      the local date-time in this chronology, not null
      See Also:

    • zonedDateTime

      public ChronoZonedDateTime<MinguoDate> zonedDateTime(TemporalAccessor temporal)
      Description copied from interface: Chronology
      Obtains a ChronoZonedDateTime in this chronology from another temporal object.

      This obtains a zoned date-time in this chronology based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of ChronoZonedDateTime.

      The conversion will first obtain a ZoneId from the temporal object, falling back to a ZoneOffset if necessary. It will then try to obtain an Instant, falling back to a ChronoLocalDateTime if necessary. The result will be either the combination of ZoneId or ZoneOffset with Instant or ChronoLocalDateTime. Implementations are permitted to perform optimizations such as accessing those fields that are equivalent to the relevant objects. The result uses this chronology.

      This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, aChronology::zonedDateTime.

      Specified by:
      zonedDateTime in interface Chronology
      Parameters:
      temporal - the temporal object to convert, not null
      Returns:
      the zoned date-time in this chronology, not null
      See Also:

    • zonedDateTime

      public ChronoZonedDateTime<MinguoDate> zonedDateTime(Instant instant, ZoneId zone)
      Description copied from interface: Chronology
      Obtains a ChronoZonedDateTime in this chronology from an Instant.

      This obtains a zoned date-time with the same instant as that specified.

      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 zoned date-time, not null

    • isLeapYear

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

      Minguo leap years occur exactly in line with ISO leap years. This method does not validate the year passed in, and only has a well-defined result for years in the supported range.

      Specified by:
      isLeapYear in interface Chronology
      Parameters:
      prolepticYear - the proleptic-year to check, not validated for range
      Returns:
      true if the year is a leap year

    • prolepticYear

      public int prolepticYear(Era era, int yearOfEra)
      Description copied from interface: Chronology
      Calculates the proleptic-year given the era and year-of-era.

      This combines the era and year-of-era into the single proleptic-year field.

      If the chronology makes active use of eras, such as JapaneseChronology then the year-of-era will be validated against the era. For other chronologies, validation is optional.

      Specified by:
      prolepticYear in interface Chronology
      Parameters:
      era - the era of the correct type for the chronology, not null
      yearOfEra - the chronology year-of-era
      Returns:
      the proleptic-year

    • eraOf

      public MinguoEra eraOf(int eraValue)
      Description copied from interface: Chronology
      Creates the chronology era object from the numeric value.

      The era is, conceptually, the largest division of the time-line. Most calendar systems have a single epoch dividing the time-line into two eras. However, some have multiple eras, such as one for the reign of each leader. The exact meaning is determined by the chronology according to the following constraints.

      The era in use at 1970-01-01 must have the value 1. Later eras must have sequentially higher values. Earlier eras must have sequentially lower values. Each chronology must refer to an enum or similar singleton to provide the era values.

      This method returns the singleton era of the correct type for the specified era value.

      Specified by:
      eraOf in interface Chronology
      Parameters:
      eraValue - the era value
      Returns:
      the calendar system era, not null

    • eras

      public List<Era> eras()
      Description copied from interface: Chronology
      Gets the list of eras for the chronology.

      Most calendar systems have an era, within which the year has meaning. If the calendar system does not support the concept of eras, an empty list must be returned.

      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)
      Description copied from interface: Chronology
      Gets the range of valid values for the specified field.

      All fields can be expressed as a long integer. This method returns an object that describes the valid range for that value.

      Note that the result only describes the minimum and maximum valid values and it is important not to read too much into them. For example, there could be values within the range that are invalid for the field.

      This method will return a result whether or not the chronology supports the field.

      Specified by:
      range in interface Chronology
      Parameters:
      field - the field to get the range for, not null
      Returns:
      the range of valid values for the field, not null

    • resolveDate

      public MinguoDate resolveDate(Map<TemporalField,Long> fieldValues, ResolverStyle resolverStyle)
      Description copied from class: AbstractChronology
      Resolves parsed ChronoField values into a date during parsing.

      Most TemporalField implementations are resolved using the resolve method on the field. By contrast, the ChronoField class defines fields that only have meaning relative to the chronology. As such, ChronoField date fields are resolved here in the context of a specific chronology.

      ChronoField instances are resolved by this method, which may be overridden in subclasses.

      • EPOCH_DAY - If present, this is converted to a date and all other date fields are then cross-checked against the date.
      • PROLEPTIC_MONTH - If present, then it is split into the YEAR and MONTH_OF_YEAR. If the mode is strict or smart then the field is validated.
      • YEAR_OF_ERA and ERA - If both are present, then they are combined to form a YEAR. In lenient mode, the YEAR_OF_ERA range is not validated, in smart and strict mode it is. The ERA is validated for range in all three modes. If only the YEAR_OF_ERA is present, and the mode is smart or lenient, then the last available era is assumed. In strict mode, no era is assumed and the YEAR_OF_ERA is left untouched. If only the ERA is present, then it is left untouched.
      • YEAR, MONTH_OF_YEAR and DAY_OF_MONTH - If all three are present, then they are combined to form a date. In all three modes, the YEAR is validated. If the mode is smart or strict, then the month and day are validated. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first day of the first month in the requested year, then adding the difference in months, then the difference in days. If the mode is smart, and the day-of-month is greater than the maximum for the year-month, then the day-of-month is adjusted to the last day-of-month. If the mode is strict, then the three fields must form a valid date.
      • YEAR and DAY_OF_YEAR - If both are present, then they are combined to form a date. In all three modes, the YEAR is validated. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first day of the requested year, then adding the difference in days. If the mode is smart or strict, then the two fields must form a valid date.
      • YEAR, MONTH_OF_YEAR, ALIGNED_WEEK_OF_MONTH and ALIGNED_DAY_OF_WEEK_IN_MONTH - If all four are present, then they are combined to form a date. In all three modes, the YEAR is validated. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first day of the first month in the requested year, then adding the difference in months, then the difference in weeks, then in days. If the mode is smart or strict, then the all four fields are validated to their outer ranges. The date is then combined in a manner equivalent to creating a date on the first day of the requested year and month, then adding the amount in weeks and days to reach their values. If the mode is strict, the date is additionally validated to check that the day and week adjustment did not change the month.
      • YEAR, MONTH_OF_YEAR, ALIGNED_WEEK_OF_MONTH and DAY_OF_WEEK - If all four are present, then they are combined to form a date. The approach is the same as described above for years, months and weeks in ALIGNED_DAY_OF_WEEK_IN_MONTH. The day-of-week is adjusted as the next or same matching day-of-week once the years, months and weeks have been handled.
      • YEAR, ALIGNED_WEEK_OF_YEAR and ALIGNED_DAY_OF_WEEK_IN_YEAR - If all three are present, then they are combined to form a date. In all three modes, the YEAR is validated. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first day of the requested year, then adding the difference in weeks, then in days. If the mode is smart or strict, then the all three fields are validated to their outer ranges. The date is then combined in a manner equivalent to creating a date on the first day of the requested year, then adding the amount in weeks and days to reach their values. If the mode is strict, the date is additionally validated to check that the day and week adjustment did not change the year.
      • YEAR, ALIGNED_WEEK_OF_YEAR and DAY_OF_WEEK - If all three are present, then they are combined to form a date. The approach is the same as described above for years and weeks in ALIGNED_DAY_OF_WEEK_IN_YEAR. The day-of-week is adjusted as the next or same matching day-of-week once the years and weeks have been handled.

      The default implementation is suitable for most calendar systems. If ChronoField.YEAR_OF_ERA is found without an ChronoField.ERA then the last era in Chronology.eras() is used. The implementation assumes a 7 day week, that the first day-of-month has the value 1, that first day-of-year has the value 1, and that the first of the month and year always exists.

      Specified by:
      resolveDate in interface Chronology
      Overrides:
      resolveDate in class AbstractChronology
      Parameters:
      fieldValues - the map of fields to values, which can be updated, not null
      resolverStyle - the requested type of resolve, not null
      Returns:
      the resolved date, null if insufficient information to create a date

    • isIsoBased

      public boolean isIsoBased()
      MinguoChronology is an ISO based chronology, which supports fields in IsoFields, such as DAY_OF_QUARTER and QUARTER_OF_YEAR.
      Specified by:
      isIsoBased in interface Chronology
      Returns:
      true
      Since:
      19
      See Also: