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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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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.TemporalAdjuster.nextOrSame;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.time.Clock;
import java.time.DateTimeException;
import java.time.DayOfWeek;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalTime;
import java.time.Month;
import java.time.Year;
import java.time.ZoneId;
import java.time.format.DateTimeFormatterBuilder;
import java.time.format.ResolverStyle;
import java.time.format.TextStyle;
import java.time.temporal.ChronoField;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalAdjuster;
import java.time.temporal.TemporalField;
import java.time.temporal.TemporalQuery;
import java.time.temporal.UnsupportedTemporalTypeException;
import java.time.temporal.ValueRange;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.ServiceLoader;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import sun.util.logging.PlatformLogger;
/**
* A calendar system, used to organize and identify dates.
* <p>
* The main date and time API is built on the ISO calendar system.
* This class operates behind the scenes to represent the general concept of a calendar system.
* For example, the Japanese, Minguo, Thai Buddhist and others.
* <p>
* Most other calendar systems also operate on the shared concepts of year, month and day,
* linked to the cycles of the Earth around the Sun, and the Moon around the Earth.
* These shared concepts are defined by {@link ChronoField} and are available
* for use by any {@code Chronology} implementation:
* <pre>
* LocalDate isoDate = ...
* ThaiBuddhistDate thaiDate = ...
* int isoYear = isoDate.get(ChronoField.YEAR);
* int thaiYear = thaiDate.get(ChronoField.YEAR);
* </pre>
* As shown, although the date objects are in different calendar systems, represented by different
* {@code Chronology} instances, both can be queried using the same constant on {@code ChronoField}.
* For a full discussion of the implications of this, see {@link ChronoLocalDate}.
* In general, the advice is to use the known ISO-based {@code LocalDate}, rather than
* {@code ChronoLocalDate}.
* <p>
* While a {@code Chronology} object typically uses {@code ChronoField} and is based on
* an era, year-of-era, month-of-year, day-of-month model of a date, this is not required.
* A {@code Chronology} instance may represent a totally different kind of calendar system,
* such as the Mayan.
* <p>
* In practical terms, the {@code Chronology} instance also acts as a factory.
* The {@link #of(String)} method allows an instance to be looked up by identifier,
* while the {@link #ofLocale(Locale)} method allows lookup by locale.
* <p>
* The {@code Chronology} instance provides a set of methods to create {@code ChronoLocalDate} instances.
* The date classes are used to manipulate specific dates.
* <p><ul>
* <li> {@link #dateNow() dateNow()}
* <li> {@link #dateNow(Clock) dateNow(clock)}
* <li> {@link #dateNow(ZoneId) dateNow(zone)}
* <li> {@link #date(int, int, int) date(yearProleptic, month, day)}
* <li> {@link #date(Era, int, int, int) date(era, yearOfEra, month, day)}
* <li> {@link #dateYearDay(int, int) dateYearDay(yearProleptic, dayOfYear)}
* <li> {@link #dateYearDay(Era, int, int) dateYearDay(era, yearOfEra, dayOfYear)}
* <li> {@link #date(TemporalAccessor) date(TemporalAccessor)}
* </ul><p>
*
* <h3 id="addcalendars">Adding New Calendars</h3>
* The set of available chronologies can be extended by applications.
* Adding a new calendar system requires the writing of an implementation of
* {@code Chronology}, {@code ChronoLocalDate} and {@code Era}.
* The majority of the logic specific to the calendar system will be in
* {@code ChronoLocalDate}. The {@code Chronology} subclass acts as a factory.
* <p>
* To permit the discovery of additional chronologies, the {@link java.util.ServiceLoader ServiceLoader}
* is used. A file must be added to the {@code META-INF/services} directory with the
* name 'java.time.chrono.Chronology' listing the implementation classes.
* See the ServiceLoader for more details on service loading.
* For lookup by id or calendarType, the system provided calendars are found
* first followed by application provided calendars.
* <p>
* Each chronology must define a chronology ID that is unique within the system.
* If the chronology represents a calendar system defined by the
* CLDR specification then the calendar type is the concatenation of the
* CLDR type and, if applicable, the CLDR variant,
*
* @implSpec
* 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
*/
public abstract class Chronology implements Comparable<Chronology> {
/**
* ChronoLocalDate order constant.
*/
static final Comparator<ChronoLocalDate> DATE_ORDER =
(Comparator<ChronoLocalDate> & Serializable) (date1, date2) -> {
return Long.compare(date1.toEpochDay(), date2.toEpochDay());
};
/**
* ChronoLocalDateTime order constant.
*/
static final Comparator<ChronoLocalDateTime<?>> DATE_TIME_ORDER =
(Comparator<ChronoLocalDateTime<?>> & Serializable) (dateTime1, dateTime2) -> {
int cmp = Long.compare(dateTime1.toLocalDate().toEpochDay(), dateTime2.toLocalDate().toEpochDay());
if (cmp == 0) {
cmp = Long.compare(dateTime1.toLocalTime().toNanoOfDay(), dateTime2.toLocalTime().toNanoOfDay());
}
return cmp;
};
/**
* ChronoZonedDateTime order constant.
*/
static final Comparator<ChronoZonedDateTime<?>> INSTANT_ORDER =
(Comparator<ChronoZonedDateTime<?>> & Serializable) (dateTime1, dateTime2) -> {
int cmp = Long.compare(dateTime1.toEpochSecond(), dateTime2.toEpochSecond());
if (cmp == 0) {
cmp = Long.compare(dateTime1.toLocalTime().getNano(), dateTime2.toLocalTime().getNano());
}
return cmp;
};
/**
* Map of available calendars by ID.
*/
private static final ConcurrentHashMap<String, Chronology> CHRONOS_BY_ID = new ConcurrentHashMap<>();
/**
* Map of available calendars by calendar type.
*/
private static final ConcurrentHashMap<String, Chronology> CHRONOS_BY_TYPE = new ConcurrentHashMap<>();
/**
* Register a Chronology by its ID and type for lookup by {@link #of(java.lang.String)}.
* Chronologies must not be registered until they are completely constructed.
* Specifically, not in the constructor of Chronology.
*
* @param chrono the chronology to register; not null
* @return the already registered Chronology if any, may be null
*/
static Chronology registerChrono(Chronology chrono) {
return registerChrono(chrono, chrono.getId());
}
/**
* Register a Chronology by ID and type for lookup by {@link #of(java.lang.String)}.
* Chronos must not be registered until they are completely constructed.
* Specifically, not in the constructor of Chronology.
*
* @param chrono the chronology to register; not null
* @param id the ID to register the chronology; not null
* @return the already registered Chronology if any, may be null
*/
static Chronology registerChrono(Chronology chrono, String id) {
Chronology prev = CHRONOS_BY_ID.putIfAbsent(id, chrono);
if (prev == null) {
String type = chrono.getCalendarType();
if (type != null) {
CHRONOS_BY_TYPE.putIfAbsent(type, chrono);
}
}
return prev;
}
/**
* Initialization of the maps from id and type to Chronology.
* The ServiceLoader is used to find and register any implementations
* of {@link java.time.chrono.Chronology} found in the bootclass loader.
* The built-in chronologies are registered explicitly.
* Calendars configured via the Thread's context classloader are local
* to that thread and are ignored.
* <p>
* The initialization is done only once using the registration
* of the IsoChronology as the test and the final step.
* Multiple threads may perform the initialization concurrently.
* Only the first registration of each Chronology is retained by the
* ConcurrentHashMap.
* @return true if the cache was initialized
*/
private static boolean initCache() {
if (CHRONOS_BY_ID.get("ISO") == null) {
// Initialization is incomplete
// Register built-in Chronologies
registerChrono(HijrahChronology.INSTANCE);
registerChrono(JapaneseChronology.INSTANCE);
registerChrono(MinguoChronology.INSTANCE);
registerChrono(ThaiBuddhistChronology.INSTANCE);
// Register Chronologies from the ServiceLoader
@SuppressWarnings("rawtypes")
ServiceLoader<Chronology> loader = ServiceLoader.load(Chronology.class, null);
for (Chronology chrono : loader) {
String id = chrono.getId();
if (id.equals("ISO") || registerChrono(chrono) != null) {
// Log the attempt to replace an existing Chronology
PlatformLogger logger = PlatformLogger.getLogger("java.time.chrono");
logger.warning("Ignoring duplicate Chronology, from ServiceLoader configuration " + id);
}
}
// finally, register IsoChronology to mark initialization is complete
registerChrono(IsoChronology.INSTANCE);
return true;
}
return false;
}
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code Chronology} from a temporal object.
* <p>
* 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}.
* <p>
* The conversion will obtain the chronology using {@link TemporalQuery#chronology()}.
* If the specified temporal object does not have a chronology, {@link IsoChronology} is returned.
* <p>
* This method matches the signature of the functional interface {@link TemporalQuery}
* allowing it to be used in queries 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) {
Objects.requireNonNull(temporal, "temporal");
Chronology obj = temporal.query(TemporalQuery.chronology());
return (obj != null ? obj : IsoChronology.INSTANCE);
}
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code Chronology} from a locale.
* <p>
* This returns a {@code Chronology} based on the specified locale,
* typically returning {@code IsoChronology}. Other calendar systems
* are only returned if they are explicitly selected within the locale.
* <p>
* The {@link Locale} class provide access to a range of information useful
* for localizing an application. This includes the language and region,
* such as "en-GB" for English as used in Great Britain.
* <p>
* The {@code Locale} class also supports an extension mechanism that
* can be used to identify a calendar system. The mechanism is a form
* of key-value pairs, where the calendar system has the key "ca".
* For example, the locale "en-JP-u-ca-japanese" represents the English
* language as used in Japan with the Japanese calendar system.
* <p>
* This method finds the desired calendar system by in a manner equivalent
* to passing "ca" to {@link Locale#getUnicodeLocaleType(String)}.
* If the "ca" key is not present, then {@code IsoChronology} is returned.
* <p>
* Note that the behavior of this method differs from the older
* {@link java.util.Calendar#getInstance(Locale)} method.
* If that method receives a locale of "th_TH" it will return {@code BuddhistCalendar}.
* By contrast, this method will return {@code IsoChronology}.
* Passing the locale "th-TH-u-ca-buddhist" into either method will
* result in the Thai Buddhist calendar system and is therefore the
* recommended approach going forward for Thai calendar system localization.
* <p>
* A similar, but simpler, situation occurs for the Japanese calendar system.
* The locale "jp_JP_JP" has previously been used to access the calendar.
* However, unlike the Thai locale, "ja_JP_JP" is automatically converted by
* {@code Locale} to the modern and recommended form of "ja-JP-u-ca-japanese".
* Thus, there is no difference in behavior between this method and
* {@code Calendar#getInstance(Locale)}.
*
* @param locale the locale to use to obtain the calendar system, not null
* @return the calendar system associated with the locale, not null
* @throws DateTimeException if the locale-specified calendar cannot be found
*/
public static Chronology ofLocale(Locale locale) {
Objects.requireNonNull(locale, "locale");
String type = locale.getUnicodeLocaleType("ca");
if (type == null || "iso".equals(type) || "iso8601".equals(type)) {
return IsoChronology.INSTANCE;
}
// Not pre-defined; lookup by the type
do {
Chronology chrono = CHRONOS_BY_TYPE.get(type);
if (chrono != null) {
return chrono;
}
// If not found, do the initialization (once) and repeat the lookup
} while (initCache());
// Look for a Chronology using ServiceLoader of the Thread's ContextClassLoader
// Application provided Chronologies must not be cached
@SuppressWarnings("rawtypes")
ServiceLoader<Chronology> loader = ServiceLoader.load(Chronology.class);
for (Chronology chrono : loader) {
if (type.equals(chrono.getCalendarType())) {
return chrono;
}
}
throw new DateTimeException("Unknown calendar system: " + type);
}
//-----------------------------------------------------------------------
/**
* Obtains an instance of {@code Chronology} from a chronology ID or
* calendar system type.
* <p>
* This returns a chronology based on either the ID or the type.
* The {@link #getId() chronology ID} uniquely identifies the chronology.
* The {@link #getCalendarType() calendar system type} is defined by the
* CLDR specification.
* <p>
* The chronology may be a system chronology or a chronology
* provided by the application via ServiceLoader configuration.
* <p>
* Since some calendars can be customized, the ID or type typically refers
* to the default customization. For example, the Gregorian calendar can have multiple
* cutover dates from the Julian, but the lookup only provides the default cutover date.
*
* @param id the chronology ID or calendar system type, not null
* @return the chronology with the identifier requested, not null
* @throws DateTimeException if the chronology cannot be found
*/
public static Chronology of(String id) {
Objects.requireNonNull(id, "id");
do {
Chronology chrono = of0(id);
if (chrono != null) {
return chrono;
}
// If not found, do the initialization (once) and repeat the lookup
} while (initCache());
// Look for a Chronology using ServiceLoader of the Thread's ContextClassLoader
// Application provided Chronologies must not be cached
@SuppressWarnings("rawtypes")
ServiceLoader<Chronology> loader = ServiceLoader.load(Chronology.class);
for (Chronology chrono : loader) {
if (id.equals(chrono.getId()) || id.equals(chrono.getCalendarType())) {
return chrono;
}
}
throw new DateTimeException("Unknown chronology: " + id);
}
/**
* 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, or {@code null} if not found
*/
private static Chronology of0(String id) {
Chronology chrono = CHRONOS_BY_ID.get(id);
if (chrono == null) {
chrono = CHRONOS_BY_TYPE.get(id);
}
return chrono;
}
/**
* Returns the available chronologies.
* <p>
* Each returned {@code Chronology} is available for use in the system.
* The set of chronologies includes the system chronologies and
* any chronologies provided by the application via ServiceLoader
* configuration.
*
* @return the independent, modifiable set of the available chronology IDs, not null
*/
public static Set<Chronology> getAvailableChronologies() {
initCache(); // force initialization
HashSet<Chronology> chronos = new HashSet<>(CHRONOS_BY_ID.values());
/// Add in Chronologies from the ServiceLoader configuration
@SuppressWarnings("rawtypes")
ServiceLoader<Chronology> loader = ServiceLoader.load(Chronology.class);
for (Chronology chrono : loader) {
chronos.add(chrono);
}
return chronos;
}
//-----------------------------------------------------------------------
/**
* Creates an instance.
*/
protected Chronology() {
}
//-----------------------------------------------------------------------
/**
* Gets the ID of the chronology.
* <p>
* The ID uniquely identifies the {@code Chronology}.
* It can be used to lookup the {@code Chronology} using {@link #of(String)}.
*
* @return the chronology ID, not null
* @see #getCalendarType()
*/
public abstract String getId();
/**
* Gets the calendar type of the calendar system.
* <p>
* The calendar type is an identifier defined by the CLDR and
* <em>Unicode Locale Data Markup Language (LDML)</em> specifications
* to uniquely identification a calendar.
* The {@code getCalendarType} is the concatenation of the CLDR calendar type
* and the variant, if applicable, is appended separated by "-".
* The calendar type is used to lookup the {@code Chronology} using {@link #of(String)}.
*
* @return the calendar system type, null if the calendar is not defined by CLDR/LDML
* @see #getId()
*/
public abstract String getCalendarType();
//-----------------------------------------------------------------------
/**
* Obtains a local date in this chronology from the era, year-of-era,
* month-of-year and day-of-month fields.
*
* @param era the era of the correct type for the chronology, not null
* @param yearOfEra the chronology year-of-era
* @param month the chronology month-of-year
* @param dayOfMonth the chronology day-of-month
* @return the local date in this chronology, not null
* @throws DateTimeException if unable to create the date
* @throws ClassCastException if the {@code era} is not of the correct type for the chronology
*/
public ChronoLocalDate date(Era era, int yearOfEra, int month, int dayOfMonth) {
return date(prolepticYear(era, yearOfEra), month, dayOfMonth);
}
/**
* Obtains a local date in this chronology from the proleptic-year,
* month-of-year and day-of-month fields.
*
* @param prolepticYear the chronology proleptic-year
* @param month the chronology month-of-year
* @param dayOfMonth the chronology day-of-month
* @return the local date in this chronology, not null
* @throws DateTimeException if unable to create the date
*/
public abstract ChronoLocalDate date(int prolepticYear, int month, int dayOfMonth);
/**
* Obtains a local date in this chronology from the era, year-of-era and
* day-of-year fields.
*
* @param era the era of the correct type for the chronology, not null
* @param yearOfEra the chronology year-of-era
* @param dayOfYear the chronology day-of-year
* @return the local date in this chronology, not null
* @throws DateTimeException if unable to create the date
* @throws ClassCastException if the {@code era} is not of the correct type for the chronology
*/
public ChronoLocalDate dateYearDay(Era era, int yearOfEra, int dayOfYear) {
return dateYearDay(prolepticYear(era, yearOfEra), dayOfYear);
}
/**
* Obtains a local date in this chronology from the proleptic-year and
* day-of-year fields.
*
* @param prolepticYear the chronology proleptic-year
* @param dayOfYear the chronology day-of-year
* @return the local date in this chronology, not null
* @throws DateTimeException if unable to create the date
*/
public abstract ChronoLocalDate dateYearDay(int prolepticYear, int dayOfYear);
/**
* Obtains a local date in this chronology from the epoch-day.
* <p>
* The definition of {@link ChronoField#EPOCH_DAY EPOCH_DAY} is the same
* for all calendar systems, thus it can be used for conversion.
*
* @param epochDay the epoch day
* @return the local date in this chronology, not null
* @throws DateTimeException if unable to create the date
*/
public abstract ChronoLocalDate dateEpochDay(long epochDay);
//-----------------------------------------------------------------------
/**
* Obtains the current local date in this chronology from the system clock in the default time-zone.
* <p>
* This will query the {@link Clock#systemDefaultZone() system clock} in the default
* time-zone to obtain the current date.
* <p>
* Using this method will prevent the ability to use an alternate clock for testing
* because the clock is hard-coded.
* <p>
* This implementation uses {@link #dateNow(Clock)}.
*
* @return the current local date using the system clock and default time-zone, not null
* @throws DateTimeException if unable to create the date
*/
public ChronoLocalDate dateNow() {
return dateNow(Clock.systemDefaultZone());
}
/**
* Obtains the current local date in this chronology from the system clock in the specified time-zone.
* <p>
* This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date.
* Specifying the time-zone avoids dependence on the default time-zone.
* <p>
* Using this method will prevent the ability to use an alternate clock for testing
* because the clock is hard-coded.
*
* @param zone the zone ID to use, not null
* @return the current local date using the system clock, not null
* @throws DateTimeException if unable to create the date
*/
public ChronoLocalDate dateNow(ZoneId zone) {
return dateNow(Clock.system(zone));
}
/**
* Obtains the current local date in this chronology from the specified clock.
* <p>
* 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 {@link Clock dependency injection}.
*
* @param clock the clock to use, not null
* @return the current local date, not null
* @throws DateTimeException if unable to create the date
*/
public ChronoLocalDate dateNow(Clock clock) {
Objects.requireNonNull(clock, "clock");
return date(LocalDate.now(clock));
}
//-----------------------------------------------------------------------
/**
* Obtains a local date in this chronology from another temporal object.
* <p>
* This obtains a date in this 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 ChronoLocalDate}.
* <p>
* The conversion typically uses the {@link ChronoField#EPOCH_DAY EPOCH_DAY}
* field, which is standardized across calendar systems.
* <p>
* This method matches the signature of the functional interface {@link TemporalQuery}
* allowing it to be used as a query via method reference, {@code aChronology::date}.
*
* @param temporal the temporal object to convert, not null
* @return the local date in this chronology, not null
* @throws DateTimeException if unable to create the date
* @see ChronoLocalDate#from(TemporalAccessor)
*/
public abstract ChronoLocalDate date(TemporalAccessor temporal);
/**
* Obtains a local date-time in this chronology from another temporal object.
* <p>
* This obtains a date-time in this 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 ChronoLocalDateTime}.
* <p>
* The conversion extracts and combines the {@code ChronoLocalDate} and the
* {@code 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.
* <p>
* This method matches the signature of the functional interface {@link TemporalQuery}
* allowing it to be used as a query via method reference, {@code aChronology::localDateTime}.
*
* @param temporal the temporal object to convert, not null
* @return the local date-time in this chronology, not null
* @throws DateTimeException if unable to create the date-time
* @see ChronoLocalDateTime#from(TemporalAccessor)
*/
public ChronoLocalDateTime<? extends ChronoLocalDate> localDateTime(TemporalAccessor temporal) {
try {
return date(temporal).atTime(LocalTime.from(temporal));
} catch (DateTimeException ex) {
throw new DateTimeException("Unable to obtain ChronoLocalDateTime from TemporalAccessor: " + temporal.getClass(), ex);
}
}
/**
* Obtains a {@code ChronoZonedDateTime} in this chronology from another temporal object.
* <p>
* This obtains a zoned date-time in this 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 ChronoZonedDateTime}.
* <p>
* The conversion will first obtain a {@code ZoneId} from the temporal object,
* falling back to a {@code ZoneOffset} if necessary. It will then try to obtain
* an {@code Instant}, falling back to a {@code ChronoLocalDateTime} if necessary.
* The result will be either the combination of {@code ZoneId} or {@code ZoneOffset}
* with {@code Instant} or {@code ChronoLocalDateTime}.
* Implementations are permitted to perform optimizations such as accessing
* those fields that are equivalent to the relevant objects.
* The result uses this chronology.
* <p>
* This method matches the signature of the functional interface {@link TemporalQuery}
* allowing it to be used as a query via method reference, {@code aChronology::zonedDateTime}.
*
* @param temporal the temporal object to convert, not null
* @return the zoned date-time in this chronology, not null
* @throws DateTimeException if unable to create the date-time
* @see ChronoZonedDateTime#from(TemporalAccessor)
*/
public ChronoZonedDateTime<? extends ChronoLocalDate> zonedDateTime(TemporalAccessor temporal) {
try {
ZoneId zone = ZoneId.from(temporal);
try {
Instant instant = Instant.from(temporal);
return zonedDateTime(instant, zone);
} catch (DateTimeException ex1) {
ChronoLocalDateTimeImpl<?> cldt = ChronoLocalDateTimeImpl.ensureValid(this, localDateTime(temporal));
return ChronoZonedDateTimeImpl.ofBest(cldt, zone, null);
}
} catch (DateTimeException ex) {
throw new DateTimeException("Unable to obtain ChronoZonedDateTime from TemporalAccessor: " + temporal.getClass(), ex);
}
}
/**
* Obtains a {@code ChronoZonedDateTime} in this chronology from an {@code Instant}.
* <p>
* This obtains a zoned date-time with the same instant as that specified.
*
* @param instant the instant to create the date-time from, not null
* @param zone the time-zone, not null
* @return the zoned date-time, not null
* @throws DateTimeException if the result exceeds the supported range
*/
public ChronoZonedDateTime<? extends ChronoLocalDate> zonedDateTime(Instant instant, ZoneId zone) {
return ChronoZonedDateTimeImpl.ofInstant(this, instant, zone);
}
//-----------------------------------------------------------------------
/**
* Checks if the specified year is a leap year.
* <p>
* A leap-year is a year of a longer length than normal.
* The exact meaning is determined by the chronology according to the following constraints.
* <p><ul>
* <li>a leap-year must imply a year-length longer than a non leap-year.
* <li>a chronology that does not support the concept of a year must return false.
* </ul><p>
*
* @param prolepticYear the proleptic-year to check, not validated for range
* @return true if the year is a leap year
*/
public abstract boolean isLeapYear(long prolepticYear);
/**
* Calculates the proleptic-year given the era and year-of-era.
* <p>
* This combines the era and year-of-era into the single proleptic-year field.
* <p>
* If the chronology makes active use of eras, such as {@code JapaneseChronology}
* then the year-of-era will be validated against the era.
* For other chronologies, validation is optional.
*
* @param era the era of the correct type for the chronology, not null
* @param yearOfEra the chronology year-of-era
* @return the proleptic-year
* @throws DateTimeException if unable to convert to a proleptic-year,
* such as if the year is invalid for the era
* @throws ClassCastException if the {@code era} is not of the correct type for the chronology
*/
public abstract int prolepticYear(Era era, int yearOfEra);
/**
* Creates the chronology era object from the numeric value.
* <p>
* 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.
* <p>
* 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.
* <p>
* This method returns the singleton era of the correct type for the specified era value.
*
* @param eraValue the era value
* @return the calendar system era, not null
* @throws DateTimeException if unable to create the era
*/
public abstract Era eraOf(int eraValue);
/**
* Gets the list of eras for the chronology.
* <p>
* 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.
*
* @return the list of eras for the chronology, may be immutable, not null
*/
public abstract List<Era> eras();
//-----------------------------------------------------------------------
/**
* Gets the range of valid values for the specified field.
* <p>
* All fields can be expressed as a {@code long} integer.
* This method returns an object that describes the valid range for that value.
* <p>
* 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.
* <p>
* This method will return a result whether or not the chronology supports the field.
*
* @param field the field to get the range for, not null
* @return the range of valid values for the field, not null
* @throws DateTimeException if the range for the field cannot be obtained
*/
public abstract ValueRange range(ChronoField field);
//-----------------------------------------------------------------------
/**
* Gets the textual representation of this chronology.
* <p>
* This returns the textual name used to identify the chronology,
* suitable for presentation to the user.
* The parameters control the style of the returned text and the locale.
*
* @param style the style of the text required, not null
* @param locale the locale to use, not null
* @return the text value of the chronology, not null
*/
public String getDisplayName(TextStyle style, Locale locale) {
return new DateTimeFormatterBuilder().appendChronologyText(style).toFormatter(locale).format(toTemporal());
}
/**
* Converts this chronology to a {@code TemporalAccessor}.
* <p>
* A {@code Chronology} can be fully represented as a {@code TemporalAccessor}.
* However, the interface is not implemented by this class as most of the
* methods on the interface have no meaning to {@code Chronology}.
* <p>
* The returned temporal has no supported fields, with the query method
* supporting the return of the chronology using {@link TemporalQuery#chronology()}.
*
* @return a temporal equivalent to this chronology, not null
*/
private TemporalAccessor toTemporal() {
return new TemporalAccessor() {
@Override
public boolean isSupported(TemporalField field) {
return false;
}
@Override
public long getLong(TemporalField field) {
throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
}
@SuppressWarnings("unchecked")
@Override
public <R> R query(TemporalQuery<R> query) {
if (query == TemporalQuery.chronology()) {
return (R) Chronology.this;
}
return TemporalAccessor.super.query(query);
}
};
}
//-----------------------------------------------------------------------
/**
* Resolves parsed {@code ChronoField} values into a date during parsing.
* <p>
* 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.
* <p>
* {@code ChronoField} instances are resolved by this method, which may
* be overridden in subclasses.
* <ul>
* <li>{@code EPOCH_DAY} - If present, this is converted to a date and
* all other date fields are then cross-checked against the date.
* <li>{@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.
* <li>{@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.
* <li>{@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.
* <li>{@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.
* <li>{@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.
* <li>{@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.
* <li>{@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.
* <li>{@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.
* </ul>
* <p>
* The default implementation is suitable for most calendar systems.
* If {@link ChronoField#YEAR_OF_ERA} is found without an {@link 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 DateTimeException if the date cannot be resolved, typically
* because of a conflict in the input data
*/
public ChronoLocalDate resolveDate(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
// check epoch-day before inventing era
if (fieldValues.containsKey(EPOCH_DAY)) {
return dateEpochDay(fieldValues.remove(EPOCH_DAY));
}
// 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<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
Long pMonth = fieldValues.remove(PROLEPTIC_MONTH);
if (pMonth != null) {
if (resolverStyle != ResolverStyle.LENIENT) {
PROLEPTIC_MONTH.checkValidValue(pMonth);
}
// 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);
addFieldValue(fieldValues, MONTH_OF_YEAR, chronoDate.get(MONTH_OF_YEAR));
addFieldValue(fieldValues, YEAR, chronoDate.get(YEAR));
}
}
ChronoLocalDate resolveYearOfEra(Map<TemporalField, Long> 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, YEAR_OF_ERA);
} else {
yoe = Math.toIntExact(yoeLong);
}
if (eraLong != null) {
Era eraObj = eraOf(range(ERA).checkValidIntValue(eraLong, ERA));
addFieldValue(fieldValues, YEAR, prolepticYear(eraObj, yoe));
} else {
if (fieldValues.containsKey(YEAR)) {
int year = range(YEAR).checkValidIntValue(fieldValues.get(YEAR), 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<Era> 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)) {
range(ERA).checkValidValue(fieldValues.get(ERA), ERA); // always validated
}
return null;
}
ChronoLocalDate resolveYMD(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR);
if (resolverStyle == ResolverStyle.LENIENT) {
long months = Math.subtractExact(fieldValues.remove(MONTH_OF_YEAR), 1);
long days = Math.subtractExact(fieldValues.remove(DAY_OF_MONTH), 1);
return date(y, 1, 1).plus(months, MONTHS).plus(days, DAYS);
}
int moy = range(MONTH_OF_YEAR).checkValidIntValue(fieldValues.remove(MONTH_OF_YEAR), MONTH_OF_YEAR);
ValueRange domRange = range(DAY_OF_MONTH);
int dom = domRange.checkValidIntValue(fieldValues.remove(DAY_OF_MONTH), DAY_OF_MONTH);
if (resolverStyle == ResolverStyle.SMART) { // previous valid
try {
return date(y, moy, dom);
} catch (DateTimeException ex) {
return date(y, moy, 1).with(TemporalAdjuster.lastDayOfMonth());
}
}
return date(y, moy, dom);
}
ChronoLocalDate resolveYD(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR);
if (resolverStyle == ResolverStyle.LENIENT) {
long days = Math.subtractExact(fieldValues.remove(DAY_OF_YEAR), 1);
return dateYearDay(y, 1).plus(days, DAYS);
}
int doy = range(DAY_OF_YEAR).checkValidIntValue(fieldValues.remove(DAY_OF_YEAR), DAY_OF_YEAR);
return dateYearDay(y, doy); // smart is same as strict
}
ChronoLocalDate resolveYMAA(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR);
if (resolverStyle == ResolverStyle.LENIENT) {
long months = Math.subtractExact(fieldValues.remove(MONTH_OF_YEAR), 1);
long weeks = Math.subtractExact(fieldValues.remove(ALIGNED_WEEK_OF_MONTH), 1);
long days = Math.subtractExact(fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_MONTH), 1);
return date(y, 1, 1).plus(months, MONTHS).plus(weeks, WEEKS).plus(days, DAYS);
}
int moy = range(MONTH_OF_YEAR).checkValidIntValue(fieldValues.remove(MONTH_OF_YEAR), MONTH_OF_YEAR);
int aw = range(ALIGNED_WEEK_OF_MONTH).checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_MONTH), ALIGNED_WEEK_OF_MONTH);
int ad = range(ALIGNED_DAY_OF_WEEK_IN_MONTH).checkValidIntValue(fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_MONTH), ALIGNED_DAY_OF_WEEK_IN_MONTH);
ChronoLocalDate date = date(y, moy, 1).plus((aw - 1) * 7 + (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<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR);
if (resolverStyle == ResolverStyle.LENIENT) {
long months = Math.subtractExact(fieldValues.remove(MONTH_OF_YEAR), 1);
long weeks = Math.subtractExact(fieldValues.remove(ALIGNED_WEEK_OF_MONTH), 1);
long dow = Math.subtractExact(fieldValues.remove(DAY_OF_WEEK), 1);
return resolveAligned(date(y, 1, 1), months, weeks, dow);
}
int moy = range(MONTH_OF_YEAR).checkValidIntValue(fieldValues.remove(MONTH_OF_YEAR), MONTH_OF_YEAR);
int aw = range(ALIGNED_WEEK_OF_MONTH).checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_MONTH), ALIGNED_WEEK_OF_MONTH);
int dow = range(DAY_OF_WEEK).checkValidIntValue(fieldValues.remove(DAY_OF_WEEK), DAY_OF_WEEK);
ChronoLocalDate date = date(y, moy, 1).plus((aw - 1) * 7, 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<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR);
if (resolverStyle == ResolverStyle.LENIENT) {
long weeks = Math.subtractExact(fieldValues.remove(ALIGNED_WEEK_OF_YEAR), 1);
long days = Math.subtractExact(fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_YEAR), 1);
return dateYearDay(y, 1).plus(weeks, WEEKS).plus(days, DAYS);
}
int aw = range(ALIGNED_WEEK_OF_YEAR).checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_YEAR), ALIGNED_WEEK_OF_YEAR);
int ad = range(ALIGNED_DAY_OF_WEEK_IN_YEAR).checkValidIntValue(fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_YEAR), ALIGNED_DAY_OF_WEEK_IN_YEAR);
ChronoLocalDate date = dateYearDay(y, 1).plus((aw - 1) * 7 + (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<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR);
if (resolverStyle == ResolverStyle.LENIENT) {
long weeks = Math.subtractExact(fieldValues.remove(ALIGNED_WEEK_OF_YEAR), 1);
long dow = Math.subtractExact(fieldValues.remove(DAY_OF_WEEK), 1);
return resolveAligned(dateYearDay(y, 1), 0, weeks, dow);
}
int aw = range(ALIGNED_WEEK_OF_YEAR).checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_YEAR), ALIGNED_WEEK_OF_YEAR);
int dow = range(DAY_OF_WEEK).checkValidIntValue(fieldValues.remove(DAY_OF_WEEK), DAY_OF_WEEK);
ChronoLocalDate date = dateYearDay(y, 1).plus((aw - 1) * 7, 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(Math.subtractExact(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.
* <p>
* 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 DateTimeException if the field is already present with a different value
*/
void addFieldValue(Map<TemporalField, Long> 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, value);
}
//-----------------------------------------------------------------------
/**
* Compares this chronology to another chronology.
* <p>
* 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}.
* <p>
* The default 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.
* <p>
* The comparison is based on the entire state of the object.
* <p>
* The default implementation checks the type and calls {@link #compareTo(Chronology)}.
*
* @param obj the object to check, null returns false
* @return true if this is equal to the other chronology
*/
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof Chronology) {
return compareTo((Chronology) obj) == 0;
}
return false;
}
/**
* A hash code for this chronology.
* <p>
* The default implementation is based on the 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 ID.
*
* @return a string representation of this chronology, not null
*/
@Override
public String toString() {
return getId();
}
//-----------------------------------------------------------------------
/**
* Writes the Chronology using a
* <a href="../../../serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>.
* @serialData
* <pre>
* out.writeByte(1); // identifies a Chronology
* out.writeUTF(getId());
* </pre>
*
* @return the instance of {@code Ser}, not null
*/
Object writeReplace() {
return new Ser(Ser.CHRONO_TYPE, this);
}
/**
* Defend against malicious streams.
* @return never
* @throws InvalidObjectException always
*/
private Object readResolve() throws InvalidObjectException {
throw new InvalidObjectException("Deserialization via serialization delegate");
}
/**
* Write the Chronology id to the stream.
* @param out the output stream
* @throws IOException on any error during the write
*/
void writeExternal(DataOutput out) throws IOException {
out.writeUTF(getId());
}
/**
* Reads the Chronology id and creates the Chronology.
* @param in the input stream
* @return the Chronology
* @throws IOException on errors during the read
* @throws DateTimeException if the Chronology cannot be returned
*/
static Chronology readExternal(DataInput in) throws IOException {
String id = in.readUTF();
return Chronology.of(id);
}
}