Java example source code file (HijrahDate.java)
The HijrahDate.java Java example source code/*
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*
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/*
* Copyright (c) 2012, Stephen Colebourne & Michael Nascimento Santos
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
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*
* * Neither the name of JSR-310 nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
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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.MONTH_OF_YEAR;
import static java.time.temporal.ChronoField.YEAR;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.Serializable;
import java.time.Clock;
import java.time.DateTimeException;
import java.time.LocalDate;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.temporal.ChronoField;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalAdjuster;
import java.time.temporal.TemporalAmount;
import java.time.temporal.TemporalField;
import java.time.temporal.TemporalQuery;
import java.time.temporal.TemporalUnit;
import java.time.temporal.UnsupportedTemporalTypeException;
import java.time.temporal.ValueRange;
/**
* A date in the Hijrah calendar system.
* <p>
* This date operates using one of several variants of the
* {@linkplain HijrahChronology Hijrah calendar}.
* <p>
* The Hijrah calendar has a different total of days in a year than
* Gregorian calendar, and the length of each month is based on the period
* of a complete revolution of the moon around the earth
* (as between successive new moons).
* Refer to the {@link HijrahChronology} for details of supported variants.
* <p>
* Each HijrahDate is created bound to a particular HijrahChronology,
* The same chronology is propagated to each HijrahDate computed from the date.
* To use a different Hijrah variant, its HijrahChronology can be used
* to create new HijrahDate instances.
* Alternatively, the {@link #withVariant} method can be used to convert
* to a new HijrahChronology.
*
* <p>
* This is a <a href="{@docRoot}/java/lang/doc-files/ValueBased.html">value-based
* class; use of identity-sensitive operations (including reference equality
* ({@code ==}), identity hash code, or synchronization) on instances of
* {@code HijrahDate} 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 HijrahDate
extends ChronoLocalDateImpl<HijrahDate>
implements ChronoLocalDate, Serializable {
/**
* Serialization version.
*/
private static final long serialVersionUID = -5207853542612002020L;
/**
* The Chronology of this HijrahDate.
*/
private final transient HijrahChronology chrono;
/**
* The proleptic year.
*/
private final transient int prolepticYear;
/**
* The month-of-year.
*/
private final transient int monthOfYear;
/**
* The day-of-month.
*/
private final transient int dayOfMonth;
//-------------------------------------------------------------------------
/**
* Obtains an instance of {@code HijrahDate} from the Hijrah proleptic year,
* month-of-year and day-of-month.
*
* @param prolepticYear the proleptic year to represent in the Hijrah calendar
* @param monthOfYear the month-of-year to represent, from 1 to 12
* @param dayOfMonth the day-of-month to represent, from 1 to 30
* @return the Hijrah date, never null
* @throws DateTimeException if the value of any field is out of range
*/
static HijrahDate of(HijrahChronology chrono, int prolepticYear, int monthOfYear, int dayOfMonth) {
return new HijrahDate(chrono, prolepticYear, monthOfYear, dayOfMonth);
}
/**
* Returns a HijrahDate for the chronology and epochDay.
* @param chrono The Hijrah chronology
* @param epochDay the epoch day
* @return a HijrahDate for the epoch day; non-null
*/
static HijrahDate ofEpochDay(HijrahChronology chrono, long epochDay) {
return new HijrahDate(chrono, epochDay);
}
//-----------------------------------------------------------------------
/**
* Obtains the current {@code HijrahDate} of the Islamic Umm Al-Qura calendar
* 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.
*
* @return the current date using the system clock and default time-zone, not null
*/
public static HijrahDate now() {
return now(Clock.systemDefaultZone());
}
/**
* Obtains the current {@code HijrahDate} of the Islamic Umm Al-Qura calendar
* 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 date using the system clock, not null
*/
public static HijrahDate now(ZoneId zone) {
return now(Clock.system(zone));
}
/**
* Obtains the current {@code HijrahDate} of the Islamic Umm Al-Qura calendar
* 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 {@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 HijrahDate now(Clock clock) {
return HijrahDate.ofEpochDay(HijrahChronology.INSTANCE, LocalDate.now(clock).toEpochDay());
}
/**
* Obtains a {@code HijrahDate} of the Islamic Umm Al-Qura calendar
* from the proleptic-year, month-of-year and day-of-month fields.
* <p>
* This returns a {@code HijrahDate} with the specified fields.
* The day must be valid for the year and month, otherwise an exception will be thrown.
*
* @param prolepticYear the Hijrah proleptic-year
* @param month the Hijrah month-of-year, from 1 to 12
* @param dayOfMonth the Hijrah day-of-month, from 1 to 30
* @return the date in Hijrah 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 HijrahDate of(int prolepticYear, int month, int dayOfMonth) {
return HijrahChronology.INSTANCE.date(prolepticYear, month, dayOfMonth);
}
/**
* Obtains a {@code HijrahDate} of the Islamic Umm Al-Qura calendar from a temporal object.
* <p>
* This obtains a date in the Hijrah 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 HijrahDate}.
* <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 HijrahDate::from}.
*
* @param temporal the temporal object to convert, not null
* @return the date in Hijrah calendar system, not null
* @throws DateTimeException if unable to convert to a {@code HijrahDate}
*/
public static HijrahDate from(TemporalAccessor temporal) {
return HijrahChronology.INSTANCE.date(temporal);
}
//-----------------------------------------------------------------------
/**
* Constructs an {@code HijrahDate} with the proleptic-year, month-of-year and
* day-of-month fields.
*
* @param chrono The chronology to create the date with
* @param prolepticYear the proleptic year
* @param monthOfYear the month of year
* @param dayOfMonth the day of month
*/
private HijrahDate(HijrahChronology chrono, int prolepticYear, int monthOfYear, int dayOfMonth) {
// Computing the Gregorian day checks the valid ranges
chrono.getEpochDay(prolepticYear, monthOfYear, dayOfMonth);
this.chrono = chrono;
this.prolepticYear = prolepticYear;
this.monthOfYear = monthOfYear;
this.dayOfMonth = dayOfMonth;
}
/**
* Constructs an instance with the Epoch Day.
*
* @param epochDay the epochDay
*/
private HijrahDate(HijrahChronology chrono, long epochDay) {
int[] dateInfo = chrono.getHijrahDateInfo((int)epochDay);
this.chrono = chrono;
this.prolepticYear = dateInfo[0];
this.monthOfYear = dateInfo[1];
this.dayOfMonth = dateInfo[2];
}
//-----------------------------------------------------------------------
/**
* Gets the chronology of this date, which is the Hijrah calendar system.
* <p>
* The {@code Chronology} represents the calendar system in use.
* The era and other fields in {@link ChronoField} are defined by the chronology.
*
* @return the Hijrah chronology, not null
*/
@Override
public HijrahChronology getChronology() {
return chrono;
}
/**
* Gets the era applicable at this date.
* <p>
* The Hijrah calendar system has one era, 'AH',
* defined by {@link HijrahEra}.
*
* @return the era applicable at this date, not null
*/
@Override
public HijrahEra getEra() {
return HijrahEra.AH;
}
/**
* Returns the length of the month represented by this date.
* <p>
* This returns the length of the month in days.
* Month lengths in the Hijrah calendar system vary between 29 and 30 days.
*
* @return the length of the month in days
*/
@Override
public int lengthOfMonth() {
return chrono.getMonthLength(prolepticYear, monthOfYear);
}
/**
* Returns the length of the year represented by this date.
* <p>
* This returns the length of the year in days.
* A Hijrah calendar system year is typically shorter than
* that of the ISO calendar system.
*
* @return the length of the year in days
*/
@Override
public int lengthOfYear() {
return chrono.getYearLength(prolepticYear);
}
//-----------------------------------------------------------------------
@Override
public ValueRange range(TemporalField field) {
if (field instanceof ChronoField) {
if (isSupported(field)) {
ChronoField f = (ChronoField) field;
switch (f) {
case DAY_OF_MONTH: return ValueRange.of(1, lengthOfMonth());
case DAY_OF_YEAR: return ValueRange.of(1, lengthOfYear());
case ALIGNED_WEEK_OF_MONTH: return ValueRange.of(1, 5); // TODO
// TODO does the limited range of valid years cause years to
// start/end part way through? that would affect range
}
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 DAY_OF_WEEK: return getDayOfWeek();
case ALIGNED_DAY_OF_WEEK_IN_MONTH: return ((getDayOfWeek() - 1) % 7) + 1;
case ALIGNED_DAY_OF_WEEK_IN_YEAR: return ((getDayOfYear() - 1) % 7) + 1;
case DAY_OF_MONTH: return this.dayOfMonth;
case DAY_OF_YEAR: return this.getDayOfYear();
case EPOCH_DAY: return toEpochDay();
case ALIGNED_WEEK_OF_MONTH: return ((dayOfMonth - 1) / 7) + 1;
case ALIGNED_WEEK_OF_YEAR: return ((getDayOfYear() - 1) / 7) + 1;
case MONTH_OF_YEAR: return monthOfYear;
case PROLEPTIC_MONTH: return getProlepticMonth();
case YEAR_OF_ERA: return prolepticYear;
case YEAR: return prolepticYear;
case ERA: return getEraValue();
}
throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
}
return field.getFrom(this);
}
private long getProlepticMonth() {
return prolepticYear * 12L + monthOfYear - 1;
}
@Override
public HijrahDate with(TemporalField field, long newValue) {
if (field instanceof ChronoField) {
ChronoField f = (ChronoField) field;
// not using checkValidIntValue so EPOCH_DAY and PROLEPTIC_MONTH work
chrono.range(f).checkValidValue(newValue, f); // TODO: validate value
int nvalue = (int) newValue;
switch (f) {
case DAY_OF_WEEK: return plusDays(newValue - getDayOfWeek());
case ALIGNED_DAY_OF_WEEK_IN_MONTH: return plusDays(newValue - getLong(ALIGNED_DAY_OF_WEEK_IN_MONTH));
case ALIGNED_DAY_OF_WEEK_IN_YEAR: return plusDays(newValue - getLong(ALIGNED_DAY_OF_WEEK_IN_YEAR));
case DAY_OF_MONTH: return resolvePreviousValid(prolepticYear, monthOfYear, nvalue);
case DAY_OF_YEAR: return plusDays(Math.min(nvalue, lengthOfYear()) - getDayOfYear());
case EPOCH_DAY: return new HijrahDate(chrono, newValue);
case ALIGNED_WEEK_OF_MONTH: return plusDays((newValue - getLong(ALIGNED_WEEK_OF_MONTH)) * 7);
case ALIGNED_WEEK_OF_YEAR: return plusDays((newValue - getLong(ALIGNED_WEEK_OF_YEAR)) * 7);
case MONTH_OF_YEAR: return resolvePreviousValid(prolepticYear, nvalue, dayOfMonth);
case PROLEPTIC_MONTH: return plusMonths(newValue - getProlepticMonth());
case YEAR_OF_ERA: return resolvePreviousValid(prolepticYear >= 1 ? nvalue : 1 - nvalue, monthOfYear, dayOfMonth);
case YEAR: return resolvePreviousValid(nvalue, monthOfYear, dayOfMonth);
case ERA: return resolvePreviousValid(1 - prolepticYear, monthOfYear, dayOfMonth);
}
throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
}
return super.with(field, newValue);
}
private HijrahDate resolvePreviousValid(int prolepticYear, int month, int day) {
int monthDays = chrono.getMonthLength(prolepticYear, month);
if (day > monthDays) {
day = monthDays;
}
return HijrahDate.of(chrono, prolepticYear, month, day);
}
/**
* {@inheritDoc}
* @throws DateTimeException if unable to make the adjustment.
* For example, if the adjuster requires an ISO chronology
* @throws ArithmeticException {@inheritDoc}
*/
@Override
public HijrahDate with(TemporalAdjuster adjuster) {
return super.with(adjuster);
}
/**
* Returns a {@code HijrahDate} with the Chronology requested.
* <p>
* The year, month, and day are checked against the new requested
* HijrahChronology. If the chronology has a shorter month length
* for the month, the day is reduced to be the last day of the month.
*
* @param chronology the new HijrahChonology, non-null
* @return a HijrahDate with the requested HijrahChronology, non-null
*/
public HijrahDate withVariant(HijrahChronology chronology) {
if (chrono == chronology) {
return this;
}
// Like resolvePreviousValid the day is constrained to stay in the same month
int monthDays = chronology.getDayOfYear(prolepticYear, monthOfYear);
return HijrahDate.of(chronology, prolepticYear, monthOfYear,(dayOfMonth > monthDays) ? monthDays : dayOfMonth );
}
/**
* {@inheritDoc}
* @throws DateTimeException {@inheritDoc}
* @throws ArithmeticException {@inheritDoc}
*/
@Override
public HijrahDate plus(TemporalAmount amount) {
return super.plus(amount);
}
/**
* {@inheritDoc}
* @throws DateTimeException {@inheritDoc}
* @throws ArithmeticException {@inheritDoc}
*/
@Override
public HijrahDate minus(TemporalAmount amount) {
return super.minus(amount);
}
@Override
public long toEpochDay() {
return chrono.getEpochDay(prolepticYear, monthOfYear, dayOfMonth);
}
/**
* Gets the day-of-year field.
* <p>
* This method returns the primitive {@code int} value for the day-of-year.
*
* @return the day-of-year
*/
private int getDayOfYear() {
return chrono.getDayOfYear(prolepticYear, monthOfYear) + dayOfMonth;
}
/**
* Gets the day-of-week value.
*
* @return the day-of-week; computed from the epochday
*/
private int getDayOfWeek() {
int dow0 = (int)Math.floorMod(toEpochDay() + 3, 7);
return dow0 + 1;
}
/**
* Gets the Era of this date.
*
* @return the Era of this date; computed from epochDay
*/
private int getEraValue() {
return (prolepticYear > 1 ? 1 : 0);
}
//-----------------------------------------------------------------------
/**
* Checks if the year is a leap year, according to the Hijrah calendar system rules.
*
* @return true if this date is in a leap year
*/
@Override
public boolean isLeapYear() {
return chrono.isLeapYear(prolepticYear);
}
//-----------------------------------------------------------------------
@Override
HijrahDate plusYears(long years) {
if (years == 0) {
return this;
}
int newYear = Math.addExact(this.prolepticYear, (int)years);
return resolvePreviousValid(newYear, monthOfYear, dayOfMonth);
}
@Override
HijrahDate plusMonths(long monthsToAdd) {
if (monthsToAdd == 0) {
return this;
}
long monthCount = prolepticYear * 12L + (monthOfYear - 1);
long calcMonths = monthCount + monthsToAdd; // safe overflow
int newYear = chrono.checkValidYear(Math.floorDiv(calcMonths, 12L));
int newMonth = (int)Math.floorMod(calcMonths, 12L) + 1;
return resolvePreviousValid(newYear, newMonth, dayOfMonth);
}
@Override
HijrahDate plusWeeks(long weeksToAdd) {
return super.plusWeeks(weeksToAdd);
}
@Override
HijrahDate plusDays(long days) {
return new HijrahDate(chrono, toEpochDay() + days);
}
@Override
public HijrahDate plus(long amountToAdd, TemporalUnit unit) {
return super.plus(amountToAdd, unit);
}
@Override
public HijrahDate minus(long amountToSubtract, TemporalUnit unit) {
return super.minus(amountToSubtract, unit);
}
@Override
HijrahDate minusYears(long yearsToSubtract) {
return super.minusYears(yearsToSubtract);
}
@Override
HijrahDate minusMonths(long monthsToSubtract) {
return super.minusMonths(monthsToSubtract);
}
@Override
HijrahDate minusWeeks(long weeksToSubtract) {
return super.minusWeeks(weeksToSubtract);
}
@Override
HijrahDate minusDays(long daysToSubtract) {
return super.minusDays(daysToSubtract);
}
@Override // for javadoc and covariant return type
@SuppressWarnings("unchecked")
public final ChronoLocalDateTime<HijrahDate> atTime(LocalTime localTime) {
return (ChronoLocalDateTime<HijrahDate>)super.atTime(localTime);
}
@Override
public ChronoPeriod until(ChronoLocalDate endDate) {
// TODO: untested
HijrahDate end = getChronology().date(endDate);
long totalMonths = (end.prolepticYear - this.prolepticYear) * 12 + (end.monthOfYear - this.monthOfYear); // safe
int days = end.dayOfMonth - this.dayOfMonth;
if (totalMonths > 0 && days < 0) {
totalMonths--;
HijrahDate calcDate = this.plusMonths(totalMonths);
days = (int) (end.toEpochDay() - calcDate.toEpochDay()); // safe
} else if (totalMonths < 0 && days > 0) {
totalMonths++;
days -= end.lengthOfMonth();
}
long years = totalMonths / 12; // safe
int months = (int) (totalMonths % 12); // safe
return getChronology().period(Math.toIntExact(years), months, days);
}
//-------------------------------------------------------------------------
/**
* Compares this date to another date, including the chronology.
* <p>
* Compares this {@code HijrahDate} with another ensuring that the date is the same.
* <p>
* Only objects of type {@code HijrahDate} 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 and the Chronologies are equal
*/
@Override // override for performance
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof HijrahDate) {
HijrahDate otherDate = (HijrahDate) obj;
return prolepticYear == otherDate.prolepticYear
&& this.monthOfYear == otherDate.monthOfYear
&& this.dayOfMonth == otherDate.dayOfMonth
&& getChronology().equals(otherDate.getChronology());
}
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() {
int yearValue = prolepticYear;
int monthValue = monthOfYear;
int dayValue = dayOfMonth;
return getChronology().getId().hashCode() ^ (yearValue & 0xFFFFF800)
^ ((yearValue << 11) + (monthValue << 6) + (dayValue));
}
//-----------------------------------------------------------------------
/**
* Defend against malicious streams.
*
* @throws InvalidObjectException always
*/
private void readObject(ObjectInputStream s) throws InvalidObjectException {
throw new InvalidObjectException("Deserialization via serialization delegate");
}
/**
* Writes the object using a
* <a href="../../../serialized-form.html#java.time.chrono.Ser">dedicated serialized form.
* @serialData
* <pre>
* out.writeByte(6); // identifies a HijrahDate
* out.writeObject(chrono); // the HijrahChronology variant
* out.writeInt(get(YEAR));
* out.writeByte(get(MONTH_OF_YEAR));
* out.writeByte(get(DAY_OF_MONTH));
* </pre>
*
* @return the instance of {@code Ser}, not null
*/
private Object writeReplace() {
return new Ser(Ser.HIJRAH_DATE_TYPE, this);
}
void writeExternal(ObjectOutput out) throws IOException {
// HijrahChronology is implicit in the Hijrah_DATE_TYPE
out.writeObject(getChronology());
out.writeInt(get(YEAR));
out.writeByte(get(MONTH_OF_YEAR));
out.writeByte(get(DAY_OF_MONTH));
}
static HijrahDate readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
HijrahChronology chrono = (HijrahChronology) in.readObject();
int year = in.readInt();
int month = in.readByte();
int dayOfMonth = in.readByte();
return chrono.date(year, month, dayOfMonth);
}
}
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