AbstractChronology

java.lang.Object
- java.time.chrono.AbstractChronology

All Implemented Interfaces:

Comparable<Chronology>, Chronology

Direct Known Subclasses:

IsoChronology
```
public abstract class AbstractChronology
extends Object
implements Chronology
```
An abstract implementation of a calendar system, used to organize and identify dates.
The main date and time API is built on the ISO calendar system. The chronology operates behind the scenes to represent the general concept of a calendar system.
See Chronology for more details.
This class is separated from the Chronology interface so that the static methods are not inherited. While Chronology can be implemented directly, it is strongly recommended to extend this abstract class instead.
This class must be implemented with care to ensure other classes operate correctly. All implementations that can be instantiated must be final, immutable and thread-safe. Subclasses should be Serializable wherever possible.

Constructor Summary

Constructors
Modifier Constructor and Description

protected AbstractChronology()
Creates an instance.

Constructors
Modifier	Constructor and Description
`protected`	`AbstractChronology()` Creates an instance.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`int`	`compareTo(Chronology other)` Compares this chronology to another chronology.
`boolean`	`equals(Object obj)` Checks if this chronology is equal to another chronology.
`static Chronology`	`from(TemporalAccessor temporal)` Obtains an instance of `Chronology` from a temporal object.
`static Set<Chronology>`	`getAvailableChronologies()` Returns the available chronologies.
`int`	`hashCode()` A hash code for this chronology.
`static Chronology`	`of(String id)` Obtains an instance of `Chronology` from a chronology ID or calendar system type.
`ChronoLocalDate`	`resolveDate(Map<TemporalField,Long> fieldValues, ResolverStyle resolverStyle)` Resolves parsed `ChronoField` values into a date during parsing.
`String`	`toString()` Outputs this chronology as a `String`, using the chronology ID.

Methods inherited from class java.lang.Object
clone, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.time.chrono.Chronology
date, date, date, dateEpochDay, dateNow, dateNow, dateNow, dateYearDay, dateYearDay, eraOf, eras, getCalendarType, getId, isLeapYear, localDateTime, period, prolepticYear, range, zonedDateTime, zonedDateTime

- Constructor Detail
  - AbstractChronology
```
protected AbstractChronology()
```
    Creates an instance.
- Method Detail
  - compareTo
```
public int compareTo(Chronology other)
```
    Compares this chronology to another chronology.
    The comparison order first by the chronology ID string, then by any additional information specific to the subclass. It is "consistent with equals", as defined by Comparable.
    This implementation compares the chronology ID. Subclasses must compare any additional state that they store.
    
    Specified by:
    
    compareTo in interface Comparable<Chronology>
    
    Specified by:
    
    compareTo in interface Chronology
    
    Parameters:
    
    other - the other chronology to compare to, not null
    
    Returns:
    
    the comparator value, negative if less, positive if greater
  - equals
```
public boolean equals(@Nullable
                      Object obj)
```
    Checks if this chronology is equal to another chronology.
    The comparison is based on the entire state of the object.
    This implementation checks the type and calls compareTo(java.time.chrono.Chronology).
    
    Specified by:
    
    equals in interface Chronology
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    
    obj - the object to check, null returns false
    
    Returns:
    
    true if this is equal to the other chronology
    
    See Also:
    
    Object.hashCode(), HashMap
  - from
```
public static Chronology from(TemporalAccessor temporal)
```
    Obtains an instance of Chronology from a temporal object.
    This obtains a 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 Chronology.
    The conversion will obtain the chronology using TemporalQueries.chronology(). If the specified temporal object does not have a chronology, IsoChronology is returned.
    This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, Chronology::from.
    
    Parameters:
    
    temporal - the temporal to convert, not null
    
    Returns:
    
    the chronology, not null
    
    Throws:
    
    DateTimeException - if unable to convert to an Chronology
  - getAvailableChronologies
```
public static Set<Chronology> getAvailableChronologies()
```
    Returns the available chronologies.
    Each returned Chronology is available for use in the system.
    
    Returns:
    
    the independent, modifiable set of the available chronology IDs, not null
  - hashCode
```
public int hashCode()
```
    A hash code for this chronology.
    The hash code should be based on the entire state of the object.
    This implementation is based on the chronology ID and class. Subclasses should add any additional state that they store.
    
    Specified by:
    
    hashCode in interface Chronology
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    
    a suitable hash code
    
    See Also:
    
    Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
  - of
```
public static Chronology of(String id)
```
    Obtains an instance of Chronology from a chronology ID or calendar system type.
    
    Parameters:
    
    id - the chronology ID or calendar system type, not null
    
    Returns:
    
    the chronology with the identifier requested, not null
    
    Throws:
    
    DateTimeException - if the chronology cannot be found
  - resolveDate
```
@Nullable
public ChronoLocalDate resolveDate(Map<TemporalField,Long> fieldValues,
                                             ResolverStyle resolverStyle)
```
    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
    
    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
    
    Throws:
    
    DateTimeException - if the date cannot be resolved, typically because of a conflict in the input data
  - toString
```
public String toString()
```
    Outputs this chronology as a String, using the chronology ID.
    
    Specified by:
    
    toString in interface Chronology
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    a string representation of this chronology, not null

Class AbstractChronology

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.time.chrono.Chronology

Constructor Detail

AbstractChronology

Method Detail

compareTo

equals

from

getAvailableChronologies

hashCode

of

resolveDate

toString