* This date operates using the {@linkplain ThaiBuddhistChronology Thai Buddhist calendar}. * This calendar system is primarily used in Thailand. * Dates are aligned such that {@code 2484-01-01 (Buddhist)} is {@code 1941-01-01 (ISO)}. * *
* This is a value-based
* class; use of identity-sensitive operations (including reference equality
* ({@code ==}), identity hash code, or synchronization) on instances of
* {@code ThaiBuddhistDate} may have unpredictable results and should be avoided.
* The {@code equals} method should be used for comparisons.
*
* @implSpec
* This class is immutable and thread-safe.
*
* @since 1.8
*/
public final class ThaiBuddhistDate
extends ChronoLocalDateImpl
* This will query the {@link Clock#systemDefaultZone() system clock} in the default
* time-zone to obtain the current date.
*
* Using this method will prevent the ability to use an alternate clock for testing
* because the clock is hard-coded.
*
* @return the current date using the system clock and default time-zone, not null
*/
public static ThaiBuddhistDate now() {
return now(Clock.systemDefaultZone());
}
/**
* Obtains the current {@code ThaiBuddhistDate} from the system clock in the specified time-zone.
*
* 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.
*
* 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 date using the system clock, not null
*/
public static ThaiBuddhistDate now(ZoneId zone) {
return now(Clock.system(zone));
}
/**
* Obtains the current {@code ThaiBuddhistDate} from the specified clock.
*
* This will query the specified clock to obtain the current date - today.
* Using this method allows the use of an alternate clock for testing.
* The alternate clock may be introduced using {@linkplain Clock dependency injection}.
*
* @param clock the clock to use, not null
* @return the current date, not null
* @throws DateTimeException if the current date cannot be obtained
*/
public static ThaiBuddhistDate now(Clock clock) {
return new ThaiBuddhistDate(LocalDate.now(clock));
}
/**
* Obtains a {@code ThaiBuddhistDate} representing a date in the Thai Buddhist calendar
* system from the proleptic-year, month-of-year and day-of-month fields.
*
* This returns a {@code ThaiBuddhistDate} with the specified fields.
* The day must be valid for the year and month, otherwise an exception will be thrown.
*
* @param prolepticYear the Thai Buddhist proleptic-year
* @param month the Thai Buddhist month-of-year, from 1 to 12
* @param dayOfMonth the Thai Buddhist day-of-month, from 1 to 31
* @return the date in Thai Buddhist calendar system, not null
* @throws DateTimeException if the value of any field is out of range,
* or if the day-of-month is invalid for the month-year
*/
public static ThaiBuddhistDate of(int prolepticYear, int month, int dayOfMonth) {
return new ThaiBuddhistDate(LocalDate.of(prolepticYear - YEARS_DIFFERENCE, month, dayOfMonth));
}
/**
* Obtains a {@code ThaiBuddhistDate} from a temporal object.
*
* This obtains a date in the Thai Buddhist calendar system 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 ThaiBuddhistDate}.
*
* The conversion typically uses the {@link ChronoField#EPOCH_DAY EPOCH_DAY}
* field, which is standardized across calendar systems.
*
* This method matches the signature of the functional interface {@link TemporalQuery}
* allowing it to be used as a query via method reference, {@code ThaiBuddhistDate::from}.
*
* @param temporal the temporal object to convert, not null
* @return the date in Thai Buddhist calendar system, not null
* @throws DateTimeException if unable to convert to a {@code ThaiBuddhistDate}
*/
public static ThaiBuddhistDate from(TemporalAccessor temporal) {
return ThaiBuddhistChronology.INSTANCE.date(temporal);
}
//-----------------------------------------------------------------------
/**
* Creates an instance from an ISO date.
*
* @param isoDate the standard local date, validated not null
*/
ThaiBuddhistDate(LocalDate isoDate) {
Objects.requireNonNull(isoDate, "isoDate");
this.isoDate = isoDate;
}
//-----------------------------------------------------------------------
/**
* Gets the chronology of this date, which is the Thai Buddhist calendar system.
*
* The {@code Chronology} represents the calendar system in use.
* The era and other fields in {@link ChronoField} are defined by the chronology.
*
* @return the Thai Buddhist chronology, not null
*/
@Override
public ThaiBuddhistChronology getChronology() {
return ThaiBuddhistChronology.INSTANCE;
}
/**
* Gets the era applicable at this date.
*
* The Thai Buddhist calendar system has two eras, 'BE' and 'BEFORE_BE',
* defined by {@link ThaiBuddhistEra}.
*
* @return the era applicable at this date, not null
*/
@Override
public ThaiBuddhistEra getEra() {
return (getProlepticYear() >= 1 ? ThaiBuddhistEra.BE : ThaiBuddhistEra.BEFORE_BE);
}
/**
* Returns the length of the month represented by this date.
*
* This returns the length of the month in days.
* Month lengths match those of the ISO calendar system.
*
* @return the length of the month in days
*/
@Override
public int lengthOfMonth() {
return isoDate.lengthOfMonth();
}
//-----------------------------------------------------------------------
@Override
public ValueRange range(TemporalField field) {
if (field instanceof ChronoField) {
if (isSupported(field)) {
ChronoField f = (ChronoField) field;
switch (f) {
case DAY_OF_MONTH:
case DAY_OF_YEAR:
case ALIGNED_WEEK_OF_MONTH:
return isoDate.range(field);
case YEAR_OF_ERA: {
ValueRange range = YEAR.range();
long max = (getProlepticYear() <= 0 ? -(range.getMinimum() + YEARS_DIFFERENCE) + 1 : range.getMaximum() + YEARS_DIFFERENCE);
return ValueRange.of(1, max);
}
}
return getChronology().range(f);
}
throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
}
return field.rangeRefinedBy(this);
}
@Override
public long getLong(TemporalField field) {
if (field instanceof ChronoField) {
switch ((ChronoField) field) {
case PROLEPTIC_MONTH:
return getProlepticMonth();
case YEAR_OF_ERA: {
int prolepticYear = getProlepticYear();
return (prolepticYear >= 1 ? prolepticYear : 1 - prolepticYear);
}
case YEAR:
return getProlepticYear();
case ERA:
return (getProlepticYear() >= 1 ? 1 : 0);
}
return isoDate.getLong(field);
}
return field.getFrom(this);
}
private long getProlepticMonth() {
return getProlepticYear() * 12L + isoDate.getMonthValue() - 1;
}
private int getProlepticYear() {
return isoDate.getYear() + YEARS_DIFFERENCE;
}
//-----------------------------------------------------------------------
@Override
public ThaiBuddhistDate with(TemporalField field, long newValue) {
if (field instanceof ChronoField) {
ChronoField f = (ChronoField) field;
if (getLong(f) == newValue) {
return this;
}
switch (f) {
case PROLEPTIC_MONTH:
getChronology().range(f).checkValidValue(newValue, f);
return plusMonths(newValue - getProlepticMonth());
case YEAR_OF_ERA:
case YEAR:
case ERA: {
int nvalue = getChronology().range(f).checkValidIntValue(newValue, f);
switch (f) {
case YEAR_OF_ERA:
return with(isoDate.withYear((getProlepticYear() >= 1 ? nvalue : 1 - nvalue) - YEARS_DIFFERENCE));
case YEAR:
return with(isoDate.withYear(nvalue - YEARS_DIFFERENCE));
case ERA:
return with(isoDate.withYear((1 - getProlepticYear()) - YEARS_DIFFERENCE));
}
}
}
return with(isoDate.with(field, newValue));
}
return super.with(field, newValue);
}
/**
* {@inheritDoc}
* @throws DateTimeException {@inheritDoc}
* @throws ArithmeticException {@inheritDoc}
*/
@Override
public ThaiBuddhistDate with(TemporalAdjuster adjuster) {
return super.with(adjuster);
}
/**
* {@inheritDoc}
* @throws DateTimeException {@inheritDoc}
* @throws ArithmeticException {@inheritDoc}
*/
@Override
public ThaiBuddhistDate plus(TemporalAmount amount) {
return super.plus(amount);
}
/**
* {@inheritDoc}
* @throws DateTimeException {@inheritDoc}
* @throws ArithmeticException {@inheritDoc}
*/
@Override
public ThaiBuddhistDate minus(TemporalAmount amount) {
return super.minus(amount);
}
//-----------------------------------------------------------------------
@Override
ThaiBuddhistDate plusYears(long years) {
return with(isoDate.plusYears(years));
}
@Override
ThaiBuddhistDate plusMonths(long months) {
return with(isoDate.plusMonths(months));
}
@Override
ThaiBuddhistDate plusWeeks(long weeksToAdd) {
return super.plusWeeks(weeksToAdd);
}
@Override
ThaiBuddhistDate plusDays(long days) {
return with(isoDate.plusDays(days));
}
@Override
public ThaiBuddhistDate plus(long amountToAdd, TemporalUnit unit) {
return super.plus(amountToAdd, unit);
}
@Override
public ThaiBuddhistDate minus(long amountToAdd, TemporalUnit unit) {
return super.minus(amountToAdd, unit);
}
@Override
ThaiBuddhistDate minusYears(long yearsToSubtract) {
return super.minusYears(yearsToSubtract);
}
@Override
ThaiBuddhistDate minusMonths(long monthsToSubtract) {
return super.minusMonths(monthsToSubtract);
}
@Override
ThaiBuddhistDate minusWeeks(long weeksToSubtract) {
return super.minusWeeks(weeksToSubtract);
}
@Override
ThaiBuddhistDate minusDays(long daysToSubtract) {
return super.minusDays(daysToSubtract);
}
private ThaiBuddhistDate with(LocalDate newDate) {
return (newDate.equals(isoDate) ? this : new ThaiBuddhistDate(newDate));
}
@Override // for javadoc and covariant return type
@SuppressWarnings("unchecked")
public final ChronoLocalDateTime
* Compares this {@code ThaiBuddhistDate} with another ensuring that the date is the same.
*
* Only objects of type {@code ThaiBuddhistDate} are compared, other types return false.
* To compare the dates of two {@code TemporalAccessor} instances, including dates
* in two different chronologies, use {@link ChronoField#EPOCH_DAY} as a comparator.
*
* @param obj the object to check, null returns false
* @return true if this is equal to the other date
*/
@Override // override for performance
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof ThaiBuddhistDate) {
ThaiBuddhistDate otherDate = (ThaiBuddhistDate) obj;
return this.isoDate.equals(otherDate.isoDate);
}
return false;
}
/**
* A hash code for this date.
*
* @return a suitable hash code based only on the Chronology and the date
*/
@Override // override for performance
public int hashCode() {
return getChronology().getId().hashCode() ^ isoDate.hashCode();
}
//-----------------------------------------------------------------------
/**
* Defend against malicious streams.
*
* @param s the stream to read
* @throws InvalidObjectException always
*/
private void readObject(ObjectInputStream s) throws InvalidObjectException {
throw new InvalidObjectException("Deserialization via serialization delegate");
}
/**
* Writes the object using a
* dedicated serialized form.
* @serialData
*
* out.writeByte(10); // identifies a ThaiBuddhistDate
* out.writeInt(get(YEAR));
* out.writeByte(get(MONTH_OF_YEAR));
* out.writeByte(get(DAY_OF_MONTH));
*
*
* @return the instance of {@code Ser}, not null
*/
private Object writeReplace() {
return new Ser(Ser.THAIBUDDHIST_DATE_TYPE, this);
}
void writeExternal(DataOutput out) throws IOException {
// ThaiBuddhistChronology is implicit in the THAIBUDDHIST_DATE_TYPE
out.writeInt(this.get(YEAR));
out.writeByte(this.get(MONTH_OF_YEAR));
out.writeByte(this.get(DAY_OF_MONTH));
}
static ThaiBuddhistDate readExternal(DataInput in) throws IOException {
int year = in.readInt();
int month = in.readByte();
int dayOfMonth = in.readByte();
return ThaiBuddhistChronology.INSTANCE.date(year, month, dayOfMonth);
}
}