AbstractChronology (Java Platform SE 8 ) (original) (raw)

java.lang.Object
- java.time.chrono.AbstractChronology
All Implemented Interfaces:
Comparable<Chronology>, Chronology
Direct Known Subclasses:
HijrahChronology, IsoChronology, JapaneseChronology, MinguoChronology, ThaiBuddhistChronology

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.
Implementation Requirements:
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.
Since:
1.8

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractChronology()	Creates an instance.

Method Summary

All Methods Instance Methods Concrete Methods

Modifier and Type	Method	Description
int	compareTo(Chronology other)	Compares this chronology to another chronology.
boolean	equals(Object obj)	Checks if this chronology is equal to another chronology.
int	hashCode()	A hash code for this chronology.
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](../../../java/lang/Object.html "class in java.lang")  
   `[clone](../../../java/lang/Object.html#clone--), [finalize](../../../java/lang/Object.html#finalize--), [getClass](../../../java/lang/Object.html#getClass--), [notify](../../../java/lang/Object.html#notify--), [notifyAll](../../../java/lang/Object.html#notifyAll--), [wait](../../../java/lang/Object.html#wait--), [wait](../../../java/lang/Object.html#wait-long-), [wait](../../../java/lang/Object.html#wait-long-int-)`  
   * ### Methods inherited from interface java.time.chrono.[Chronology](../../../java/time/chrono/Chronology.html "interface in java.time.chrono")  
   `[date](../../../java/time/chrono/Chronology.html#date-java.time.chrono.Era-int-int-int-), [date](../../../java/time/chrono/Chronology.html#date-int-int-int-), [date](../../../java/time/chrono/Chronology.html#date-java.time.temporal.TemporalAccessor-), [dateEpochDay](../../../java/time/chrono/Chronology.html#dateEpochDay-long-), [dateNow](../../../java/time/chrono/Chronology.html#dateNow--), [dateNow](../../../java/time/chrono/Chronology.html#dateNow-java.time.Clock-), [dateNow](../../../java/time/chrono/Chronology.html#dateNow-java.time.ZoneId-), [dateYearDay](../../../java/time/chrono/Chronology.html#dateYearDay-java.time.chrono.Era-int-int-), [dateYearDay](../../../java/time/chrono/Chronology.html#dateYearDay-int-int-), [eraOf](../../../java/time/chrono/Chronology.html#eraOf-int-), [eras](../../../java/time/chrono/Chronology.html#eras--), [from](../../../java/time/chrono/Chronology.html#from-java.time.temporal.TemporalAccessor-), [getCalendarType](../../../java/time/chrono/Chronology.html#getCalendarType--), [getDisplayName](../../../java/time/chrono/Chronology.html#getDisplayName-java.time.format.TextStyle-java.util.Locale-), [getId](../../../java/time/chrono/Chronology.html#getId--), [isLeapYear](../../../java/time/chrono/Chronology.html#isLeapYear-long-), [localDateTime](../../../java/time/chrono/Chronology.html#localDateTime-java.time.temporal.TemporalAccessor-), [period](../../../java/time/chrono/Chronology.html#period-int-int-int-), [prolepticYear](../../../java/time/chrono/Chronology.html#prolepticYear-java.time.chrono.Era-int-), [range](../../../java/time/chrono/Chronology.html#range-java.time.temporal.ChronoField-), [zonedDateTime](../../../java/time/chrono/Chronology.html#zonedDateTime-java.time.Instant-java.time.ZoneId-), [zonedDateTime](../../../java/time/chrono/Chronology.html#zonedDateTime-java.time.temporal.TemporalAccessor-)`

Constructor Detail

 * #### AbstractChronology  
 protected AbstractChronology()  
 Creates an instance.

Method Detail

* #### resolveDate  
public [ChronoLocalDate](../../../java/time/chrono/ChronoLocalDate.html "interface in java.time.chrono") resolveDate([Map](../../../java/util/Map.html "interface in java.util")<[TemporalField](../../../java/time/temporal/TemporalField.html "interface in java.time.temporal"),[Long](../../../java/lang/Long.html "class in java.lang")> fieldValues,  
                                   [ResolverStyle](../../../java/time/format/ResolverStyle.html "enum in java.time.format") 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](../../../java/time/temporal/ChronoField.html#YEAR%5FOF%5FERA) is found without an [ChronoField.ERA](../../../java/time/temporal/ChronoField.html#ERA) then the last era in [Chronology.eras()](../../../java/time/chrono/Chronology.html#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](../../../java/time/chrono/Chronology.html#resolveDate-java.util.Map-java.time.format.ResolverStyle-)` in interface `[Chronology](../../../java/time/chrono/Chronology.html "interface in java.time.chrono")`  
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](../../../java/time/DateTimeException.html "class in java.time")` \- if the date cannot be resolved, typically because of a conflict in the input data  
* #### compareTo  
public int compareTo([Chronology](../../../java/time/chrono/Chronology.html "interface in java.time.chrono") 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](../../../java/lang/Comparable.html "interface in java.lang").  
Specified by:  
`[compareTo](../../../java/lang/Comparable.html#compareTo-T-)` in interface `[Comparable](../../../java/lang/Comparable.html "interface in java.lang")<[Chronology](../../../java/time/chrono/Chronology.html "interface in java.time.chrono")>`  
Specified by:  
`[compareTo](../../../java/time/chrono/Chronology.html#compareTo-java.time.chrono.Chronology-)` in interface `[Chronology](../../../java/time/chrono/Chronology.html "interface in java.time.chrono")`  
Implementation Requirements:  
This implementation compares the chronology ID. Subclasses must compare any additional state that they store.  
Parameters:  
`other` \- the other chronology to compare to, not null  
Returns:  
the comparator value, negative if less, positive if greater  
* #### equals  
public boolean equals([Object](../../../java/lang/Object.html "class in java.lang") obj)  
Checks if this chronology is equal to another chronology.  
 The comparison is based on the entire state of the object.  
Specified by:  
`[equals](../../../java/time/chrono/Chronology.html#equals-java.lang.Object-)` in interface `[Chronology](../../../java/time/chrono/Chronology.html "interface in java.time.chrono")`  
Overrides:  
`[equals](../../../java/lang/Object.html#equals-java.lang.Object-)` in class `[Object](../../../java/lang/Object.html "class in java.lang")`  
Implementation Requirements:  
This implementation checks the type and calls[compareTo(java.time.chrono.Chronology)](../../../java/time/chrono/AbstractChronology.html#compareTo-java.time.chrono.Chronology-).  
Parameters:  
`obj` \- the object to check, null returns false  
Returns:  
true if this is equal to the other chronology  
See Also:  
[Object.hashCode()](../../../java/lang/Object.html#hashCode--), [HashMap](../../../java/util/HashMap.html "class in java.util")  
* #### hashCode  
public int hashCode()  
A hash code for this chronology.  
 The hash code should be based on the entire state of the object.  
Specified by:  
`[hashCode](../../../java/time/chrono/Chronology.html#hashCode--)` in interface `[Chronology](../../../java/time/chrono/Chronology.html "interface in java.time.chrono")`  
Overrides:  
`[hashCode](../../../java/lang/Object.html#hashCode--)` in class `[Object](../../../java/lang/Object.html "class in java.lang")`  
Implementation Requirements:  
This implementation is based on the chronology ID and class. Subclasses should add any additional state that they store.  
Returns:  
a suitable hash code  
See Also:  
[Object.equals(java.lang.Object)](../../../java/lang/Object.html#equals-java.lang.Object-), [System.identityHashCode(java.lang.Object)](../../../java/lang/System.html#identityHashCode-java.lang.Object-)  
* #### toString  
public [String](../../../java/lang/String.html "class in java.lang") toString()  
Outputs this chronology as a `String`, using the chronology ID.  
Specified by:  
`[toString](../../../java/time/chrono/Chronology.html#toString--)` in interface `[Chronology](../../../java/time/chrono/Chronology.html "interface in java.time.chrono")`  
Overrides:  
`[toString](../../../java/lang/Object.html#toString--)` in class `[Object](../../../java/lang/Object.html "class in java.lang")`  
Returns:  
a string representation of this chronology, not null

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2025, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

AbstractChronology (Java Platform SE 8 ) (original) (raw)

Constructor Summary

Method Summary

Constructor Detail

Method Detail