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/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file:
*
* Copyright (c) 2012, Stephen Colebourne & Michael Nascimento Santos
*
* All rights reserved.
*
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* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
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*/
package java.time.chrono;
import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH;
import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_YEAR;
import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_MONTH;
import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_YEAR;
import static java.time.temporal.ChronoField.DAY_OF_MONTH;
import static java.time.temporal.ChronoField.DAY_OF_WEEK;
import static java.time.temporal.ChronoField.DAY_OF_YEAR;
import static java.time.temporal.ChronoField.EPOCH_DAY;
import static java.time.temporal.ChronoField.ERA;
import static java.time.temporal.ChronoField.MONTH_OF_YEAR;
import static java.time.temporal.ChronoField.PROLEPTIC_MONTH;
import static java.time.temporal.ChronoField.YEAR;
import static java.time.temporal.ChronoField.YEAR_OF_ERA;
import static java.time.temporal.ChronoUnit.DAYS;
import static java.time.temporal.ChronoUnit.MONTHS;
import static java.time.temporal.ChronoUnit.WEEKS;
import static java.time.temporal.TemporalAdjusters.nextOrSame;
import java.time.DateTimeException;
import java.time.DayOfWeek;
import java.time.format.ResolverStyle;
import java.time.temporal.ChronoField;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalAdjusters;
import java.time.temporal.TemporalField;
import java.time.temporal.TemporalQueries;
import java.time.temporal.TemporalQuery;
import java.time.temporal.ValueRange;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import ej.annotation.Nullable;
/**
* 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 {@link Chronology} for more details.
*
* This class is separated from the {@code Chronology} interface so that the static methods
* are not inherited. While {@code 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.
*/
public abstract class AbstractChronology implements Chronology {
/**
* Obtains an instance of {@code Chronology} from a chronology ID or
* calendar system type.
*
* @param id the chronology ID or calendar system type, not null
* @return the chronology with the identifier requested, not null
* @throws java.time.DateTimeException if the chronology cannot be found
*/
public static Chronology of(String id) {
IsoChronology isoChronology = IsoChronology.INSTANCE;
String calendarType = isoChronology.getCalendarType();
assert calendarType != null;
if (isoChronology.getId().equals(id) || calendarType.equals(id)) {
return isoChronology;
}
throw new DateTimeException("Unknown chronology: " + id);
}
/**
* Returns the available chronologies.
*
* Each returned {@code Chronology} is available for use in the system.
*
* @return the independent, modifiable set of the available chronology IDs, not null
*/
public static Set getAvailableChronologies() {
HashSet chronos = new HashSet<>(1);
chronos.add(IsoChronology.INSTANCE);
return chronos;
}
/**
* Obtains an instance of {@code Chronology} from a temporal object.
*
* This obtains a chronology based on the specified temporal.
* A {@code TemporalAccessor} represents an arbitrary set of date and time information,
* which this factory converts to an instance of {@code Chronology}.
*
* The conversion will obtain the chronology using {@link TemporalQueries#chronology()}.
* If the specified temporal object does not have a chronology, {@link IsoChronology} is returned.
*
* This method matches the signature of the functional interface {@link TemporalQuery}
* allowing it to be used as a query via method reference, {@code Chronology::from}.
*
* @param temporal the temporal to convert, not null
* @return the chronology, not null
* @throws DateTimeException if unable to convert to an {@code Chronology}
*/
public static Chronology from(TemporalAccessor temporal) {
Chronology obj = temporal.query(TemporalQueries.chronology());
return (obj != null ? obj : IsoChronology.INSTANCE);
}
//-----------------------------------------------------------------------
/**
* Creates an instance.
*/
protected AbstractChronology() {
}
//-----------------------------------------------------------------------
/**
* Resolves parsed {@code ChronoField} values into a date during parsing.
*
* Most {@code TemporalField} implementations are resolved using the
* resolve method on the field. By contrast, the {@code ChronoField} class
* defines fields that only have meaning relative to the chronology.
* As such, {@code ChronoField} date fields are resolved here in the
* context of a specific chronology.
*
* {@code ChronoField} instances are resolved by this method, which may
* be overridden in subclasses.
*
* - {@code EPOCH_DAY} - If present, this is converted to a date and
* all other date fields are then cross-checked against the date.
*
- {@code PROLEPTIC_MONTH} - If present, then it is split into the
* {@code YEAR} and {@code MONTH_OF_YEAR}. If the mode is strict or smart
* then the field is validated.
*
- {@code YEAR_OF_ERA} and {@code ERA} - If both are present, then they
* are combined to form a {@code YEAR}. In lenient mode, the {@code YEAR_OF_ERA}
* range is not validated, in smart and strict mode it is. The {@code ERA} is
* validated for range in all three modes. If only the {@code 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 {@code YEAR_OF_ERA} is
* left untouched. If only the {@code ERA} is present, then it is left untouched.
*
- {@code YEAR}, {@code MONTH_OF_YEAR} and {@code DAY_OF_MONTH} -
* If all three are present, then they are combined to form a date.
* In all three modes, the {@code 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.
*
- {@code YEAR} and {@code DAY_OF_YEAR} -
* If both are present, then they are combined to form a date.
* In all three modes, the {@code 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.
*
- {@code YEAR}, {@code MONTH_OF_YEAR}, {@code ALIGNED_WEEK_OF_MONTH} and
* {@code ALIGNED_DAY_OF_WEEK_IN_MONTH} -
* If all four are present, then they are combined to form a date.
* In all three modes, the {@code 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.
*
- {@code YEAR}, {@code MONTH_OF_YEAR}, {@code ALIGNED_WEEK_OF_MONTH} and
* {@code 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 {@code 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.
*
- {@code YEAR}, {@code ALIGNED_WEEK_OF_YEAR} and {@code ALIGNED_DAY_OF_WEEK_IN_YEAR} -
* If all three are present, then they are combined to form a date.
* In all three modes, the {@code 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.
*
- {@code YEAR}, {@code ALIGNED_WEEK_OF_YEAR} and {@code 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
* {@code 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 {@link java.time.temporal.ChronoField#YEAR_OF_ERA} is found without an {@link java.time.temporal.ChronoField#ERA}
* then the last era in {@link #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.
*
* @param fieldValues the map of fields to values, which can be updated, not null
* @param resolverStyle the requested type of resolve, not null
* @return the resolved date, null if insufficient information to create a date
* @throws java.time.DateTimeException if the date cannot be resolved, typically
* because of a conflict in the input data
*/
@Override
@Nullable
public ChronoLocalDate resolveDate(Map fieldValues, ResolverStyle resolverStyle) {
// check epoch-day before inventing era
if (fieldValues.containsKey(EPOCH_DAY)) {
Long epochDay = fieldValues.remove(EPOCH_DAY);
assert epochDay != null;
return dateEpochDay(epochDay.longValue());
}
// fix proleptic month before inventing era
resolveProlepticMonth(fieldValues, resolverStyle);
// invent era if necessary to resolve year-of-era
ChronoLocalDate resolved = resolveYearOfEra(fieldValues, resolverStyle);
if (resolved != null) {
return resolved;
}
// build date
if (fieldValues.containsKey(YEAR)) {
if (fieldValues.containsKey(MONTH_OF_YEAR)) {
if (fieldValues.containsKey(DAY_OF_MONTH)) {
return resolveYMD(fieldValues, resolverStyle);
}
if (fieldValues.containsKey(ALIGNED_WEEK_OF_MONTH)) {
if (fieldValues.containsKey(ALIGNED_DAY_OF_WEEK_IN_MONTH)) {
return resolveYMAA(fieldValues, resolverStyle);
}
if (fieldValues.containsKey(DAY_OF_WEEK)) {
return resolveYMAD(fieldValues, resolverStyle);
}
}
}
if (fieldValues.containsKey(DAY_OF_YEAR)) {
return resolveYD(fieldValues, resolverStyle);
}
if (fieldValues.containsKey(ALIGNED_WEEK_OF_YEAR)) {
if (fieldValues.containsKey(ALIGNED_DAY_OF_WEEK_IN_YEAR)) {
return resolveYAA(fieldValues, resolverStyle);
}
if (fieldValues.containsKey(DAY_OF_WEEK)) {
return resolveYAD(fieldValues, resolverStyle);
}
}
}
return null;
}
void resolveProlepticMonth(Map fieldValues, ResolverStyle resolverStyle) {
Long pMonth = fieldValues.remove(PROLEPTIC_MONTH);
if (pMonth != null) {
if (resolverStyle != ResolverStyle.LENIENT) {
PROLEPTIC_MONTH.checkValidValue(pMonth.longValue());
}
// first day-of-month is likely to be safest for setting proleptic-month
// cannot add to year zero, as not all chronologies have a year zero
ChronoLocalDate chronoDate = dateNow()
.with(DAY_OF_MONTH, 1).with(PROLEPTIC_MONTH, pMonth.longValue());
addFieldValue(fieldValues, MONTH_OF_YEAR, chronoDate.get(MONTH_OF_YEAR));
addFieldValue(fieldValues, YEAR, chronoDate.get(YEAR));
}
}
@Nullable
ChronoLocalDate resolveYearOfEra(Map fieldValues, ResolverStyle resolverStyle) {
Long yoeLong = fieldValues.remove(YEAR_OF_ERA);
if (yoeLong != null) {
Long eraLong = fieldValues.remove(ERA);
int yoe;
if (resolverStyle != ResolverStyle.LENIENT) {
yoe = range(YEAR_OF_ERA).checkValidIntValue(yoeLong.longValue(), YEAR_OF_ERA);
} else {
yoe = (int) yoeLong.longValue();
}
if (eraLong != null) {
Era eraObj = eraOf(range(ERA).checkValidIntValue(eraLong.longValue(), ERA));
addFieldValue(fieldValues, YEAR, prolepticYear(eraObj, yoe));
} else {
if (fieldValues.containsKey(YEAR)) {
Long yearLong = fieldValues.get(YEAR);
assert yearLong != null;
int year = range(YEAR).checkValidIntValue(yearLong.longValue(), YEAR);
ChronoLocalDate chronoDate = dateYearDay(year, 1);
addFieldValue(fieldValues, YEAR, prolepticYear(chronoDate.getEra(), yoe));
} else if (resolverStyle == ResolverStyle.STRICT) {
// do not invent era if strict
// reinstate the field removed earlier, no cross-check issues
fieldValues.put(YEAR_OF_ERA, yoeLong);
} else {
List eras = eras();
if (eras.isEmpty()) {
addFieldValue(fieldValues, YEAR, yoe);
} else {
Era eraObj = eras.get(eras.size() - 1);
addFieldValue(fieldValues, YEAR, prolepticYear(eraObj, yoe));
}
}
}
} else if (fieldValues.containsKey(ERA)) {
Long era = fieldValues.get(ERA);
assert era != null;
range(ERA).checkValidValue(era.longValue(), ERA); // always validated
}
return null;
}
ChronoLocalDate resolveYMD(Map fieldValues, ResolverStyle resolverStyle) {
Long year = fieldValues.remove(YEAR);
assert year != null;
int y = range(YEAR).checkValidIntValue(year.longValue(), YEAR);
Long monthOfYear = fieldValues.remove(MONTH_OF_YEAR);
assert monthOfYear != null;
Long dayOfMonth = fieldValues.remove(DAY_OF_MONTH);
assert dayOfMonth != null;
if (resolverStyle == ResolverStyle.LENIENT) {
long months = monthOfYear.longValue() - 1;
long days = dayOfMonth.longValue() - 1;
return date(y, 1, 1).plus(months, MONTHS).plus(days, DAYS);
}
int moy = range(MONTH_OF_YEAR).checkValidIntValue(monthOfYear.longValue(), MONTH_OF_YEAR);
ValueRange domRange = range(DAY_OF_MONTH);
int dom = domRange.checkValidIntValue(dayOfMonth.longValue(), DAY_OF_MONTH);
if (resolverStyle == ResolverStyle.SMART) { // previous valid
try {
return date(y, moy, dom);
} catch (DateTimeException ex) {
return date(y, moy, 1).with(TemporalAdjusters.lastDayOfMonth());
}
}
return date(y, moy, dom);
}
ChronoLocalDate resolveYD(Map fieldValues, ResolverStyle resolverStyle) {
Long year = fieldValues.remove(YEAR);
assert year != null;
int y = range(YEAR).checkValidIntValue(year.longValue(), YEAR);
Long dayOfYear = fieldValues.remove(DAY_OF_YEAR);
assert dayOfYear != null;
if (resolverStyle == ResolverStyle.LENIENT) {
long days = dayOfYear.longValue() - 1;
return dateYearDay(y, 1).plus(days, DAYS);
}
int doy = range(DAY_OF_YEAR).checkValidIntValue(dayOfYear.longValue(), DAY_OF_YEAR);
return dateYearDay(y, doy); // smart is same as strict
}
ChronoLocalDate resolveYMAA(Map fieldValues, ResolverStyle resolverStyle) {
Long year = fieldValues.remove(YEAR);
assert year != null;
int y = range(YEAR).checkValidIntValue(year.longValue(), YEAR);
Long monthOfYear = fieldValues.remove(MONTH_OF_YEAR);
assert monthOfYear != null;
Long alignedWeekOfMonth = fieldValues.remove(ALIGNED_WEEK_OF_MONTH);
assert alignedWeekOfMonth != null;
Long alignedDoWinMonth = fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_MONTH);
assert alignedDoWinMonth != null;
if (resolverStyle == ResolverStyle.LENIENT) {
long months = monthOfYear.longValue() - 1;
long weeks = alignedWeekOfMonth.longValue() - 1;
long days = alignedDoWinMonth.longValue() - 1;
return date(y, 1, 1).plus(months, MONTHS).plus(weeks, WEEKS).plus(days, DAYS);
}
int moy = range(MONTH_OF_YEAR).checkValidIntValue(monthOfYear.longValue(), MONTH_OF_YEAR);
int aw = range(ALIGNED_WEEK_OF_MONTH).checkValidIntValue(alignedWeekOfMonth.longValue(), ALIGNED_WEEK_OF_MONTH);
int ad = range(ALIGNED_DAY_OF_WEEK_IN_MONTH).checkValidIntValue(alignedDoWinMonth.longValue(), ALIGNED_DAY_OF_WEEK_IN_MONTH);
ChronoLocalDate date = date(y, moy, 1).plus((aw - 1) * 7L + (ad - 1), DAYS);
if (resolverStyle == ResolverStyle.STRICT && date.get(MONTH_OF_YEAR) != moy) {
throw new DateTimeException("Strict mode rejected resolved date as it is in a different month");
}
return date;
}
ChronoLocalDate resolveYMAD(Map fieldValues, ResolverStyle resolverStyle) {
Long year = fieldValues.remove(YEAR);
assert year != null;
int y = range(YEAR).checkValidIntValue(year.longValue(), YEAR);
Long monthOfYear = fieldValues.remove(MONTH_OF_YEAR);
assert monthOfYear != null;
Long alignedWeekOfMonth = fieldValues.remove(ALIGNED_WEEK_OF_MONTH);
assert alignedWeekOfMonth != null;
Long dayOfWeek = fieldValues.remove(DAY_OF_WEEK);
assert dayOfWeek != null;
if (resolverStyle == ResolverStyle.LENIENT) {
long months = monthOfYear.longValue() - 1;
long weeks = alignedWeekOfMonth.longValue() - 1;
long dow = dayOfWeek.longValue() - 1;
return resolveAligned(date(y, 1, 1), months, weeks, dow);
}
int moy = range(MONTH_OF_YEAR).checkValidIntValue(monthOfYear.longValue(), MONTH_OF_YEAR);
int aw = range(ALIGNED_WEEK_OF_MONTH).checkValidIntValue(alignedWeekOfMonth.longValue(), ALIGNED_WEEK_OF_MONTH);
int dow = range(DAY_OF_WEEK).checkValidIntValue(dayOfWeek.longValue(), DAY_OF_WEEK);
ChronoLocalDate date = date(y, moy, 1).plus((aw - 1) * 7L, DAYS).with(nextOrSame(DayOfWeek.of(dow)));
if (resolverStyle == ResolverStyle.STRICT && date.get(MONTH_OF_YEAR) != moy) {
throw new DateTimeException("Strict mode rejected resolved date as it is in a different month");
}
return date;
}
ChronoLocalDate resolveYAA(Map fieldValues, ResolverStyle resolverStyle) {
Long year = fieldValues.remove(YEAR);
assert year != null;
int y = range(YEAR).checkValidIntValue(year.longValue(), YEAR);
Long alignedWeekOfYear = fieldValues.remove(ALIGNED_WEEK_OF_YEAR);
assert alignedWeekOfYear != null;
Long alignedDoWinYear = fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_YEAR);
assert alignedDoWinYear != null;
if (resolverStyle == ResolverStyle.LENIENT) {
long weeks = alignedWeekOfYear.longValue() - 1;
long days = alignedDoWinYear.longValue() - 1;
return dateYearDay(y, 1).plus(weeks, WEEKS).plus(days, DAYS);
}
int aw = range(ALIGNED_WEEK_OF_YEAR).checkValidIntValue(alignedWeekOfYear.longValue(), ALIGNED_WEEK_OF_YEAR);
int ad = range(ALIGNED_DAY_OF_WEEK_IN_YEAR).checkValidIntValue(alignedDoWinYear.longValue(), ALIGNED_DAY_OF_WEEK_IN_YEAR);
ChronoLocalDate date = dateYearDay(y, 1).plus((aw - 1) * 7L + (ad - 1), DAYS);
if (resolverStyle == ResolverStyle.STRICT && date.get(YEAR) != y) {
throw new DateTimeException("Strict mode rejected resolved date as it is in a different year");
}
return date;
}
ChronoLocalDate resolveYAD(Map fieldValues, ResolverStyle resolverStyle) {
Long year = fieldValues.remove(YEAR);
assert year != null;
int y = range(YEAR).checkValidIntValue(year.longValue(), YEAR);
Long alignedWeekOfYear = fieldValues.remove(ALIGNED_WEEK_OF_YEAR);
assert alignedWeekOfYear != null;
Long dayOfWeek = fieldValues.remove(DAY_OF_WEEK);
assert dayOfWeek != null;
if (resolverStyle == ResolverStyle.LENIENT) {
long weeks = alignedWeekOfYear.longValue() - 1;
long dow = dayOfWeek.longValue() - 1;
return resolveAligned(dateYearDay(y, 1), 0, weeks, dow);
}
int aw = range(ALIGNED_WEEK_OF_YEAR).checkValidIntValue(alignedWeekOfYear.longValue(), ALIGNED_WEEK_OF_YEAR);
int dow = range(DAY_OF_WEEK).checkValidIntValue(dayOfWeek.longValue(), DAY_OF_WEEK);
ChronoLocalDate date = dateYearDay(y, 1).plus((aw - 1) * 7L, DAYS).with(nextOrSame(DayOfWeek.of(dow)));
if (resolverStyle == ResolverStyle.STRICT && date.get(YEAR) != y) {
throw new DateTimeException("Strict mode rejected resolved date as it is in a different year");
}
return date;
}
ChronoLocalDate resolveAligned(ChronoLocalDate base, long months, long weeks, long dow) {
ChronoLocalDate date = base.plus(months, MONTHS).plus(weeks, WEEKS);
if (dow > 7) {
date = date.plus((dow - 1) / 7, WEEKS);
dow = ((dow - 1) % 7) + 1;
} else if (dow < 1) {
date = date.plus((dow - 7) / 7, WEEKS);
dow = ((dow + 6) % 7) + 1;
}
return date.with(nextOrSame(DayOfWeek.of((int) dow)));
}
/**
* Adds a field-value pair to the map, checking for conflicts.
*
* If the field is not already present, then the field-value pair is added to the map.
* If the field is already present and it has the same value as that specified, no action occurs.
* If the field is already present and it has a different value to that specified, then
* an exception is thrown.
*
* @param field the field to add, not null
* @param value the value to add, not null
* @throws java.time.DateTimeException if the field is already present with a different value
*/
void addFieldValue(Map fieldValues, ChronoField field, long value) {
Long old = fieldValues.get(field); // check first for better error message
if (old != null && old.longValue() != value) {
throw new DateTimeException("Conflict found: " + field + " " + old + " differs from " + field + " " + value);
}
fieldValues.put(field, Long.valueOf(value));
}
//-----------------------------------------------------------------------
/**
* 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 {@link Comparable}.
*
* This implementation compares the chronology ID.
* Subclasses must compare any additional state that they store.
*
* @param other the other chronology to compare to, not null
* @return the comparator value, negative if less, positive if greater
*/
@Override
public int compareTo(Chronology other) {
return getId().compareTo(other.getId());
}
/**
* 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
* {@link #compareTo(java.time.chrono.Chronology)}.
*
* @param obj the object to check, null returns false
* @return true if this is equal to the other chronology
*/
@Override
public boolean equals(@Nullable Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof AbstractChronology) {
return compareTo((AbstractChronology) obj) == 0;
}
return false;
}
/**
* 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.
*
* @return a suitable hash code
*/
@Override
public int hashCode() {
return getClass().hashCode() ^ getId().hashCode();
}
//-----------------------------------------------------------------------
/**
* Outputs this chronology as a {@code String}, using the chronology ID.
*
* @return a string representation of this chronology, not null
*/
@Override
public String toString() {
return getId();
}
}