InternationalFixedChronology.java
/*
* Copyright (c) 2007-present, Stephen Colebourne & Michael Nascimento Santos
*
* All rights reserved.
*
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* modification, are permitted provided that the following conditions are met:
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* this list of conditions and the following disclaimer.
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* * 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
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package org.threeten.extra.chrono;
import java.io.Serializable;
import java.time.Clock;
import java.time.DateTimeException;
import java.time.Instant;
import java.time.ZoneId;
import java.time.chrono.AbstractChronology;
import java.time.chrono.ChronoLocalDateTime;
import java.time.chrono.ChronoZonedDateTime;
import java.time.chrono.Chronology;
import java.time.chrono.Era;
import java.time.temporal.ChronoField;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.ValueRange;
import java.util.Arrays;
import java.util.List;
/**
* The International Fixed calendar system.
* <p>
* This chronology defines the rules of the International Fixed calendar system.
* It shares the leap year rule with the Gregorian calendar.
* Dates are aligned such that {@code 0001-01-01 (International Fixed)} is {@code 0001-01-01 (ISO)}.
* <p>
* This class is proleptic. It implements only years greater or equal to 1.
* <p>
* This class implements a calendar where January 1st is the start of the year.
* <p>
* The fields are defined as follows:
* <ul>
* <li>era - There is only one era, the current 'Common Era' (CE).
* <li>year-of-era - The year-of-era for the current era increases uniformly from the epoch at year 1.
* <li>proleptic-year - The proleptic year is the same as the year-of-era for the current era.
* <li>month-of-year - There are 13 months in an International Fixed year, numbered from 1 to 13.
* <li>day-of-month - There are 28 days in a standard International Fixed month, numbered from 1 to 28,
* with day 29 used in months 6 and 12 (month 6 only has 29 days in a leap year).
* <li>day-of-year - There are 365 days in a standard International Fixed year and 366 days in a leap year.
* The days are numbered accordingly.
* <li>leap-year - Leap years occur every 4 years, but skips 3 out of four centuries, i.e. when the century
* is not divisible by 400. This is the same rule in use for the Gregorian calendar.
* <li>Week day - every month starts on a Sunday. Leap-day and year-day are neither part of a week, nor of any month.
* </ul>
*
* <h3>Implementation Requirements</h3>
* This class is immutable and thread-safe.
*/
public final class InternationalFixedChronology extends AbstractChronology implements Serializable {
/**
* Singleton instance for the International fixed chronology.
*/
public static final InternationalFixedChronology INSTANCE = new InternationalFixedChronology();
/**
* Serialization version UID.
*/
private static final long serialVersionUID = -8252657100538813526L;
/**
* Standard 7-day week.
*/
static final int DAYS_IN_WEEK = 7;
/**
* In all months, there are 4 complete weeks.
*/
static final int WEEKS_IN_MONTH = 4;
/**
* There are 13 months in a year.
*/
static final int MONTHS_IN_YEAR = 13;
/**
* There are 4 weeks of 7 days, or 28 total days in a month.
*/
static final int DAYS_IN_MONTH = WEEKS_IN_MONTH * DAYS_IN_WEEK;
/**
* There are 29 days in a long month.
*/
static final int DAYS_IN_LONG_MONTH = DAYS_IN_MONTH + 1;
/**
* There are 13 months of 28 days, or 365 days in a (non-leap) year.
*/
static final int DAYS_IN_YEAR = MONTHS_IN_YEAR * DAYS_IN_MONTH + 1;
/**
* There are 52 weeks in a year.
*/
static final int WEEKS_IN_YEAR = DAYS_IN_YEAR / DAYS_IN_WEEK;
/**
* The number of days in a 400 year cycle.
*/
static final int DAYS_PER_CYCLE = 146097;
/**
* The number of days from year zero to year 1970, still the era only allows year 1 and higher.
* There are five 400 year cycles from year zero to 2000.
* There are 7 leap years from 1970 to 2000.
*/
static final long DAYS_0000_TO_1970 = (DAYS_PER_CYCLE * 5L) - (30L * 365L + 7L);
/**
* Range of year.
*/
static final ValueRange YEAR_RANGE = ValueRange.of(1, 1_000_000L);
/**
* Epoch day range.
*/
static final ValueRange EPOCH_DAY_RANGE = ValueRange.of(-DAYS_0000_TO_1970, 1_000_000L * DAYS_IN_YEAR + getLeapYearsBefore(1_000_000L) - DAYS_0000_TO_1970);
/**
* Range of proleptic month.
*/
private static final ValueRange PROLEPTIC_MONTH_RANGE = ValueRange.of(13, 1_000_000 * 13L - 1);
/**
* Range of day of month.
*/
static final ValueRange DAY_OF_MONTH_RANGE = ValueRange.of(1, DAYS_IN_MONTH + 1);
/**
* Range of day of year.
*/
static final ValueRange DAY_OF_YEAR_NORMAL_RANGE = ValueRange.of(1, DAYS_IN_YEAR);
/**
* Range of day of leap year.
*/
static final ValueRange DAY_OF_YEAR_LEAP_RANGE = ValueRange.of(1, DAYS_IN_YEAR + 1);
/**
* Range of month of year.
*/
static final ValueRange MONTH_OF_YEAR_RANGE = ValueRange.of(1, MONTHS_IN_YEAR);
/**
* Range of eras.
*/
static final ValueRange ERA_RANGE = ValueRange.of(1, 1);
/**
* Empty range: [0, 0].
*/
static final ValueRange EMPTY_RANGE = ValueRange.of(0, 0);
/**
* Private constructor, that is public to satisfy the {@code ServiceLoader}.
* @deprecated Use the singleton {@link #INSTANCE} instead.
*/
@Deprecated
public InternationalFixedChronology() {
}
/**
* Resolve singleton.
*
* @return the singleton instance, not null
*/
@SuppressWarnings("static-method")
private Object readResolve() {
return INSTANCE;
}
//-----------------------------------------------------------------------
/**
* Gets the ID of the chronology - 'Ifc'.
* <p>
* The ID uniquely identifies the {@code Chronology}.
* It can be used to lookup the {@code Chronology} using {@link Chronology#of(String)}.
*
* @return the chronology ID - 'Ifc'
* @see #getCalendarType()
*/
@Override
public String getId() {
return "Ifc";
}
/**
* Gets the calendar type of the underlying calendar system, which returns null.
* <p>
* The <em>Unicode Locale Data Markup Language (LDML)</em> specification
* does not define an identifier for this calendar system, thus null is returned.
*
* @return the calendar system type, null
* @see #getId()
*/
@Override
public String getCalendarType() {
return null;
}
//-----------------------------------------------------------------------
/**
* Obtains a local date in International Fixed calendar system from the
* era, year-of-era, month-of-year and day-of-month fields.
*
* @param era the International Fixed era, not null
* @param yearOfEra the year-of-era
* @param month the month-of-year
* @param dayOfMonth the day-of-month
* @return the International Fixed local date, not null
* @throws DateTimeException if unable to create the date
* @throws ClassCastException if the {@code era} is not a {@code InternationalFixedEra}
*/
@Override
public InternationalFixedDate date(Era era, int yearOfEra, int month, int dayOfMonth) {
return date(prolepticYear(era, yearOfEra), month, dayOfMonth);
}
/**
* Obtains a local date in International Fixed calendar system from the
* proleptic-year, month-of-year and day-of-month fields.
*
* @param prolepticYear the proleptic-year
* @param month the month-of-year
* @param dayOfMonth the day-of-month
* @return the International Fixed local date, not null
* @throws DateTimeException if unable to create the date
*/
@Override
public InternationalFixedDate date(int prolepticYear, int month, int dayOfMonth) {
return InternationalFixedDate.of(prolepticYear, month, dayOfMonth);
}
/**
* Obtains a local date in International Fixed calendar system from the
* era, year-of-era and day-of-year fields.
*
* @param era the International Fixed era, not null
* @param yearOfEra the year-of-era
* @param dayOfYear the day-of-year
* @return the International Fixed local date, not null
* @throws DateTimeException if unable to create the date
* @throws ClassCastException if the {@code era} is not a {@code InternationalFixedEra}
*/
@Override
public InternationalFixedDate dateYearDay(Era era, int yearOfEra, int dayOfYear) {
return dateYearDay(prolepticYear(era, yearOfEra), dayOfYear);
}
/**
* Obtains a local date in International Fixed calendar system from the
* proleptic-year and day-of-year fields.
*
* @param prolepticYear the proleptic-year
* @param dayOfYear the day-of-year
* @return the International Fixed local date, not null
* @throws DateTimeException if unable to create the date
*/
@Override
public InternationalFixedDate dateYearDay(int prolepticYear, int dayOfYear) {
return InternationalFixedDate.ofYearDay(prolepticYear, dayOfYear);
}
/**
* Obtains a local date in the International Fixed calendar system from the epoch-day.
*
* @param epochDay the epoch day
* @return the International Fixed local date, not null
* @throws DateTimeException if unable to create the date
*/
@Override // override with covariant return type
public InternationalFixedDate dateEpochDay(long epochDay) {
return InternationalFixedDate.ofEpochDay(epochDay);
}
//-------------------------------------------------------------------------
/**
* Obtains the current International Fixed local date 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.
*
* @return the current International Fixed local date using the system clock and default time-zone, not null
* @throws DateTimeException if unable to create the date
*/
@Override // override with covariant return type
public InternationalFixedDate dateNow() {
return InternationalFixedDate.now();
}
/**
* Obtains the current International Fixed local date 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 International Fixed local date using the system clock, not null
* @throws DateTimeException if unable to create the date
*/
@Override // override with covariant return type
public InternationalFixedDate dateNow(ZoneId zone) {
return InternationalFixedDate.now(zone);
}
/**
* Obtains the current International Fixed local date 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 International Fixed local date, not null
* @throws DateTimeException if unable to create the date
*/
@Override // override with covariant return type
public InternationalFixedDate dateNow(Clock clock) {
return InternationalFixedDate.now(clock);
}
//-------------------------------------------------------------------------
/**
* Obtains a International Fixed local date from another date-time object.
*
* @param temporal the date-time object to convert, not null
* @return the International Fixed local date, not null
* @throws DateTimeException if unable to create the date
*/
@Override
public InternationalFixedDate date(TemporalAccessor temporal) {
return InternationalFixedDate.from(temporal);
}
/**
* Obtains a International Fixed local date-time from another date-time object.
*
* @param temporal the date-time object to convert, not null
* @return the International Fixed local date-time, not null
* @throws DateTimeException if unable to create the date-time
*/
@Override
@SuppressWarnings("unchecked")
public ChronoLocalDateTime<InternationalFixedDate> localDateTime(TemporalAccessor temporal) {
return (ChronoLocalDateTime<InternationalFixedDate>) super.localDateTime(temporal);
}
/**
* Obtains a International Fixed zoned date-time from another date-time object.
*
* @param temporal the date-time object to convert, not null
* @return the International Fixed zoned date-time, not null
* @throws DateTimeException if unable to create the date-time
*/
@Override
@SuppressWarnings("unchecked")
public ChronoZonedDateTime<InternationalFixedDate> zonedDateTime(TemporalAccessor temporal) {
return (ChronoZonedDateTime<InternationalFixedDate>) super.zonedDateTime(temporal);
}
/**
* Obtains a International Fixed zoned date-time in this chronology from an {@code Instant}.
*
* @param instant the instant to create the date-time from, not null
* @param zone the time-zone, not null
* @return the International Fixed zoned date-time, not null
* @throws DateTimeException if the result exceeds the supported range
*/
@Override
@SuppressWarnings("unchecked")
public ChronoZonedDateTime<InternationalFixedDate> zonedDateTime(Instant instant, ZoneId zone) {
return (ChronoZonedDateTime<InternationalFixedDate>) super.zonedDateTime(instant, zone);
}
//-----------------------------------------------------------------------
/**
* Checks if the specified year is a leap year.
* <p>
* A leap-year is a year of a longer length than normal.
* Leap years in the calendar system match those of the ISO calendar system.
*
* @param year the proleptic-year to check, not validated for range
* @return true if the year is a leap year
*/
@Override
public boolean isLeapYear(long year) {
return ((year & 3) == 0) && ((year % 100) != 0 || (year % 400) == 0);
}
//-----------------------------------------------------------------------
/**
* Creates the chronology era object from the numeric value.
* <p>
* Only one era is supported, CE, with the value 1.
*
* @param eraValue the era value
* @return the calendar system era, not null
* @throws DateTimeException if unable to create the era
*/
@Override
public InternationalFixedEra eraOf(int eraValue) {
return InternationalFixedEra.of(eraValue);
}
/**
* Gets the list of eras for the chronology.
* <p>
* Only one era is supported, CE, with the value 1.
*
* @return the list of eras for the chronology, may be immutable, not null
*/
@Override
public List<Era> eras() {
return Arrays.<Era>asList(InternationalFixedEra.values());
}
//-----------------------------------------------------------------------
@Override
public ValueRange range(ChronoField field) {
switch (field) {
case ALIGNED_DAY_OF_WEEK_IN_YEAR:
case ALIGNED_DAY_OF_WEEK_IN_MONTH:
case DAY_OF_WEEK:
return ValueRange.of(0, 1, 0, DAYS_IN_WEEK);
case ALIGNED_WEEK_OF_MONTH:
return ValueRange.of(0, 1, 0, WEEKS_IN_MONTH);
case ALIGNED_WEEK_OF_YEAR:
return ValueRange.of(0, 1, 0, WEEKS_IN_YEAR);
case DAY_OF_MONTH:
return DAY_OF_MONTH_RANGE;
case DAY_OF_YEAR:
return ChronoField.DAY_OF_YEAR.range();
case EPOCH_DAY:
return EPOCH_DAY_RANGE;
case ERA:
return ERA_RANGE;
case MONTH_OF_YEAR:
return MONTH_OF_YEAR_RANGE;
case PROLEPTIC_MONTH:
return PROLEPTIC_MONTH_RANGE;
case YEAR_OF_ERA:
case YEAR:
return YEAR_RANGE;
default:
return field.range();
}
}
@Override
public int prolepticYear(Era era, int yearOfEra) {
if (!(era instanceof InternationalFixedEra)) {
throw new ClassCastException("Invalid era: " + era);
}
return YEAR_RANGE.checkValidIntValue(yearOfEra, ChronoField.YEAR_OF_ERA);
}
/**
* Get the count of leap years since International fixed year 1.
*
* @param prolepticYear The year.
* @return The number of leap years since International fixed year 1.
*/
static long getLeapYearsBefore(long prolepticYear) {
long yearBefore = prolepticYear - 1;
return (yearBefore / 4) - (yearBefore / 100) + (yearBefore / 400);
}
}