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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.
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package java.time.chrono;

import java.io.InvalidObjectException;
import static java.time.temporal.ChronoField.PROLEPTIC_MONTH;
import static java.time.temporal.ChronoField.YEAR;

import java.io.ObjectInputStream;
import java.io.Serializable;
import java.time.Clock;
import java.time.DateTimeException;
import java.time.Instant;
import java.time.LocalDate;
import java.time.ZoneId;
import java.time.format.ResolverStyle;
import java.time.temporal.ChronoField;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalField;
import java.time.temporal.ValueRange;
import java.util.List;
import java.util.Locale;
import java.util.Map;


The Minguo calendar system.

 This chronology defines the rules of the Minguo calendar system. This calendar system is primarily used in the Republic of China, often known as Taiwan. Dates are aligned such that 0001-01-01 (Minguo) is 1912-01-01 (ISO). 

The fields are defined as follows:

    

  • era - There are two eras, the current 'Republic' (ERA_ROC) and the previous era (ERA_BEFORE_ROC).

  • year-of-era - The year-of-era for the current era increases uniformly from the epoch at year one.
 For the previous era the year increases from one as time goes backwards.
 The value for the current era is equal to the ISO proleptic-year minus 1911.

  • proleptic-year - The proleptic year is the same as the year-of-era for the
 current era. For the previous era, years have zero, then negative values.
 The value is equal to the ISO proleptic-year minus 1911.

  • month-of-year - The Minguo month-of-year exactly matches ISO.

  • day-of-month - The Minguo day-of-month exactly matches ISO.

  • day-of-year - The Minguo day-of-year exactly matches ISO.

  • leap-year - The Minguo leap-year pattern exactly matches ISO, such that the two calendars
 are never out of step.



Implementation Requirements:
This class is immutable and thread-safe.
Since:1.8
/**
 * The Minguo calendar system.
 * <p>
 * This chronology defines the rules of the Minguo calendar system.
 * This calendar system is primarily used in the Republic of China, often known as Taiwan.
 * Dates are aligned such that {@code 0001-01-01 (Minguo)} is {@code 1912-01-01 (ISO)}.
 * <p>
 * The fields are defined as follows:
 * <ul>
 * <li>era - There are two eras, the current 'Republic' (ERA_ROC) and the previous era (ERA_BEFORE_ROC).
 * <li>year-of-era - The year-of-era for the current era increases uniformly from the epoch at year one.
 *  For the previous era the year increases from one as time goes backwards.
 *  The value for the current era is equal to the ISO proleptic-year minus 1911.
 * <li>proleptic-year - The proleptic year is the same as the year-of-era for the
 *  current era. For the previous era, years have zero, then negative values.
 *  The value is equal to the ISO proleptic-year minus 1911.
 * <li>month-of-year - The Minguo month-of-year exactly matches ISO.
 * <li>day-of-month - The Minguo day-of-month exactly matches ISO.
 * <li>day-of-year - The Minguo day-of-year exactly matches ISO.
 * <li>leap-year - The Minguo leap-year pattern exactly matches ISO, such that the two calendars
 *  are never out of step.
 * </ul>
 *
 * @implSpec
 * This class is immutable and thread-safe.
 *
 * @since 1.8
 */
public final class MinguoChronology extends AbstractChronology implements Serializable {

    
Singleton instance for the Minguo chronology.

/**
     * Singleton instance for the Minguo chronology.
     */
    public static final MinguoChronology INSTANCE = new MinguoChronology();

    
Serialization version.

/**
     * Serialization version.
     */
    private static final long serialVersionUID = 1039765215346859963L;
    
The difference in years between ISO and Minguo.

/**
     * The difference in years between ISO and Minguo.
     */
    static final int YEARS_DIFFERENCE = 1911;

    
Restricted constructor.

/**
     * Restricted constructor.
     */
    private MinguoChronology() {
    }

    //-----------------------------------------------------------------------
    
Gets the ID of the chronology - 'Minguo'.

 The ID uniquely identifies the Chronology. It can be used to lookup the Chronology using Chronology.of(String). 
See Also:
Returns:the chronology ID - 'Minguo'
/**
     * Gets the ID of the chronology - 'Minguo'.
     * <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 - 'Minguo'
     * @see #getCalendarType()
     */
    @Override
    public String getId() {
        return "Minguo";
    }

    
Gets the calendar type of the underlying calendar system - 'roc'.


The calendar type is an identifier defined by the
Unicode Locale Data Markup Language (LDML) specification. It can be used to lookup the Chronology using Chronology.of(String). It can also be used as part of a locale, accessible via Locale.getUnicodeLocaleType(String) with the key 'ca'. 
See Also:
Returns:the calendar system type - 'roc'
/**
     * Gets the calendar type of the underlying calendar system - 'roc'.
     * <p>
     * The calendar type is an identifier defined by the
     * <em>Unicode Locale Data Markup Language (LDML)</em> specification.
     * It can be used to lookup the {@code Chronology} using {@link Chronology#of(String)}.
     * It can also be used as part of a locale, accessible via
     * {@link Locale#getUnicodeLocaleType(String)} with the key 'ca'.
     *
     * @return the calendar system type - 'roc'
     * @see #getId()
     */
    @Override
    public String getCalendarType() {
        return "roc";
    }

    //-----------------------------------------------------------------------
    
Obtains a local date in Minguo calendar system from the
era, year-of-era, month-of-year and day-of-month fields.

Params:
  • era –  the Minguo era, not null
  • yearOfEra –  the year-of-era
  • month –  the month-of-year
  • dayOfMonth –  the day-of-month
Throws:
Returns:the Minguo local date, not null
/**
     * Obtains a local date in Minguo calendar system from the
     * era, year-of-era, month-of-year and day-of-month fields.
     *
     * @param era  the Minguo era, not null
     * @param yearOfEra  the year-of-era
     * @param month  the month-of-year
     * @param dayOfMonth  the day-of-month
     * @return the Minguo local date, not null
     * @throws DateTimeException if unable to create the date
     * @throws ClassCastException if the {@code era} is not a {@code MinguoEra}
     */
    @Override
    public MinguoDate date(Era era, int yearOfEra, int month, int dayOfMonth) {
        return date(prolepticYear(era, yearOfEra), month, dayOfMonth);
    }

    
Obtains a local date in Minguo calendar system from the
proleptic-year, month-of-year and day-of-month fields.

Params:
  • prolepticYear –  the proleptic-year
  • month –  the month-of-year
  • dayOfMonth –  the day-of-month
Throws:
Returns:the Minguo local date, not null
/**
     * Obtains a local date in Minguo 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 Minguo local date, not null
     * @throws DateTimeException if unable to create the date
     */
    @Override
    public MinguoDate date(int prolepticYear, int month, int dayOfMonth) {
        return new MinguoDate(LocalDate.of(prolepticYear + YEARS_DIFFERENCE, month, dayOfMonth));
    }

    
Obtains a local date in Minguo calendar system from the
era, year-of-era and day-of-year fields.

Params:
  • era –  the Minguo era, not null
  • yearOfEra –  the year-of-era
  • dayOfYear –  the day-of-year
Throws:
Returns:the Minguo local date, not null
/**
     * Obtains a local date in Minguo calendar system from the
     * era, year-of-era and day-of-year fields.
     *
     * @param era  the Minguo era, not null
     * @param yearOfEra  the year-of-era
     * @param dayOfYear  the day-of-year
     * @return the Minguo local date, not null
     * @throws DateTimeException if unable to create the date
     * @throws ClassCastException if the {@code era} is not a {@code MinguoEra}
     */
    @Override
    public MinguoDate dateYearDay(Era era, int yearOfEra, int dayOfYear) {
        return dateYearDay(prolepticYear(era, yearOfEra), dayOfYear);
    }

    
Obtains a local date in Minguo calendar system from the
proleptic-year and day-of-year fields.

Params:
  • prolepticYear –  the proleptic-year
  • dayOfYear –  the day-of-year
Throws:
Returns:the Minguo local date, not null
/**
     * Obtains a local date in Minguo calendar system from the
     * proleptic-year and day-of-year fields.
     *
     * @param prolepticYear  the proleptic-year
     * @param dayOfYear  the day-of-year
     * @return the Minguo local date, not null
     * @throws DateTimeException if unable to create the date
     */
    @Override
    public MinguoDate dateYearDay(int prolepticYear, int dayOfYear) {
        return new MinguoDate(LocalDate.ofYearDay(prolepticYear + YEARS_DIFFERENCE, dayOfYear));
    }

    
Obtains a local date in the Minguo calendar system from the epoch-day.

Params:
  • epochDay –  the epoch day
Throws:
Returns:the Minguo local date, not null
/**
     * Obtains a local date in the Minguo calendar system from the epoch-day.
     *
     * @param epochDay  the epoch day
     * @return the Minguo local date, not null
     * @throws DateTimeException if unable to create the date
     */
    @Override  // override with covariant return type
    public MinguoDate dateEpochDay(long epochDay) {
        return new MinguoDate(LocalDate.ofEpochDay(epochDay));
    }

    @Override
    public MinguoDate dateNow() {
        return dateNow(Clock.systemDefaultZone());
    }

    @Override
    public MinguoDate dateNow(ZoneId zone) {
        return dateNow(Clock.system(zone));
    }

    @Override
    public MinguoDate dateNow(Clock clock) {
        return date(LocalDate.now(clock));
    }

    @Override
    public MinguoDate date(TemporalAccessor temporal) {
        if (temporal instanceof MinguoDate) {
            return (MinguoDate) temporal;
        }
        return new MinguoDate(LocalDate.from(temporal));
    }

    @Override
    @SuppressWarnings("unchecked")
    public ChronoLocalDateTime<MinguoDate> localDateTime(TemporalAccessor temporal) {
        return (ChronoLocalDateTime<MinguoDate>)super.localDateTime(temporal);
    }

    @Override
    @SuppressWarnings("unchecked")
    public ChronoZonedDateTime<MinguoDate> zonedDateTime(TemporalAccessor temporal) {
        return (ChronoZonedDateTime<MinguoDate>)super.zonedDateTime(temporal);
    }

    @Override
    @SuppressWarnings("unchecked")
    public ChronoZonedDateTime<MinguoDate> zonedDateTime(Instant instant, ZoneId zone) {
        return (ChronoZonedDateTime<MinguoDate>)super.zonedDateTime(instant, zone);
    }

    //-----------------------------------------------------------------------
    
Checks if the specified year is a leap year.


Minguo leap years occur exactly in line with ISO leap years.
This method does not validate the year passed in, and only has a
well-defined result for years in the supported range.

Params:
  • prolepticYear –  the proleptic-year to check, not validated for range
Returns:true if the year is a leap year
/**
     * Checks if the specified year is a leap year.
     * <p>
     * Minguo leap years occur exactly in line with ISO leap years.
     * This method does not validate the year passed in, and only has a
     * well-defined result for years in the supported range.
     *
     * @param prolepticYear  the proleptic-year to check, not validated for range
     * @return true if the year is a leap year
     */
    @Override
    public boolean isLeapYear(long prolepticYear) {
        return IsoChronology.INSTANCE.isLeapYear(prolepticYear + YEARS_DIFFERENCE);
    }

    @Override
    public int prolepticYear(Era era, int yearOfEra) {
        if (era instanceof MinguoEra == false) {
            throw new ClassCastException("Era must be MinguoEra");
        }
        return (era == MinguoEra.ROC ? yearOfEra : 1 - yearOfEra);
    }

    @Override
    public MinguoEra eraOf(int eraValue) {
        return MinguoEra.of(eraValue);
    }

    @Override
    public List<Era> eras() {
        return List.of(MinguoEra.values());
    }

    //-----------------------------------------------------------------------
    @Override
    public ValueRange range(ChronoField field) {
        switch (field) {
            case PROLEPTIC_MONTH: {
                ValueRange range = PROLEPTIC_MONTH.range();
                return ValueRange.of(range.getMinimum() - YEARS_DIFFERENCE * 12L, range.getMaximum() - YEARS_DIFFERENCE * 12L);
            }
            case YEAR_OF_ERA: {
                ValueRange range = YEAR.range();
                return ValueRange.of(1, range.getMaximum() - YEARS_DIFFERENCE, -range.getMinimum() + 1 + YEARS_DIFFERENCE);
            }
            case YEAR: {
                ValueRange range = YEAR.range();
                return ValueRange.of(range.getMinimum() - YEARS_DIFFERENCE, range.getMaximum() - YEARS_DIFFERENCE);
            }
        }
        return field.range();
    }

    //-----------------------------------------------------------------------
    @Override  // override for return type
    public MinguoDate resolveDate(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
        return (MinguoDate) super.resolveDate(fieldValues, resolverStyle);
    }

    //-----------------------------------------------------------------------
    
Writes the Chronology using a
dedicated serialized form.

@serialData

 out.writeByte(1);     // identifies a Chronology
 out.writeUTF(getId());

Returns:the instance of Ser, not null
/**
     * 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
     */
    @Override
    Object writeReplace() {
        return super.writeReplace();
    }

    
Defend against malicious streams.

Params:
  • s – the stream to read
Throws:
/**
     * 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");
    }
}