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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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
 *    and/or other materials provided with the distribution.
 *
 *  * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 */
package java.time.chrono;

import static java.time.chrono.MinguoChronology.YEARS_DIFFERENCE;
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.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.time.Clock;
import java.time.DateTimeException;
import java.time.LocalDate;
import java.time.LocalTime;
import java.time.Period;
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;
import java.util.Objects;


A date in the Minguo calendar system.

 This date operates using the Minguo calendar. 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). 

This is a value-based class; use of identity-sensitive operations (including reference equality (==), identity hash code, or synchronization) on instances of MinguoDate may have unpredictable results and should be avoided. The equals method should be used for comparisons. 
Implementation Requirements:
This class is immutable and thread-safe.
Since:1.8
/**
 * A date in the Minguo calendar system.
 * <p>
 * This date operates using the {@linkplain MinguoChronology Minguo calendar}.
 * 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>
 * This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
 * class; use of identity-sensitive operations (including reference equality
 * ({@code ==}), identity hash code, or synchronization) on instances of
 * {@code MinguoDate} 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 MinguoDate
        extends ChronoLocalDateImpl<MinguoDate>
        implements ChronoLocalDate, Serializable {

    
Serialization version.

/**
     * Serialization version.
     */
    private static final long serialVersionUID = 1300372329181994526L;

    
The underlying date.

/**
     * The underlying date.
     */
    private final transient LocalDate isoDate;

    //-----------------------------------------------------------------------
    
Obtains the current MinguoDate from the system clock in the default time-zone. 
 This will query the 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.

Returns:the current date using the system clock and default time-zone, not null
/**
     * Obtains the current {@code MinguoDate} 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 date using the system clock and default time-zone, not null
     */
    public static MinguoDate now() {
        return now(Clock.systemDefaultZone());
    }

    
Obtains the current MinguoDate from the system clock in the specified time-zone. 
 This will query the 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.

Params:
  • zone –  the zone ID to use, not null
Returns:the current date using the system clock, not null
/**
     * Obtains the current {@code MinguoDate} 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 date using the system clock, not null
     */
    public static MinguoDate now(ZoneId zone) {
        return now(Clock.system(zone));
    }

    
Obtains the current MinguoDate 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 dependency injection. 
Params:
  • clock –  the clock to use, not null
Throws:
Returns:the current date, not null
/**
     * Obtains the current {@code MinguoDate} 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 MinguoDate now(Clock clock) {
        return new MinguoDate(LocalDate.now(clock));
    }

    
Obtains a MinguoDate representing a date in the Minguo calendar system from the proleptic-year, month-of-year and day-of-month fields. 
 This returns a MinguoDate with the specified fields. The day must be valid for the year and month, otherwise an exception will be thrown. 
Params:
  • prolepticYear –  the Minguo proleptic-year
  • month –  the Minguo month-of-year, from 1 to 12
  • dayOfMonth –  the Minguo day-of-month, from 1 to 31
Throws:
  • DateTimeException – if the value of any field is out of range,
 or if the day-of-month is invalid for the month-year
Returns:the date in Minguo calendar system, not null
/**
     * Obtains a {@code MinguoDate} representing a date in the Minguo calendar
     * system from the proleptic-year, month-of-year and day-of-month fields.
     * <p>
     * This returns a {@code MinguoDate} with the specified fields.
     * The day must be valid for the year and month, otherwise an exception will be thrown.
     *
     * @param prolepticYear  the Minguo proleptic-year
     * @param month  the Minguo month-of-year, from 1 to 12
     * @param dayOfMonth  the Minguo day-of-month, from 1 to 31
     * @return the date in Minguo 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 MinguoDate of(int prolepticYear, int month, int dayOfMonth) {
        return new MinguoDate(LocalDate.of(prolepticYear + YEARS_DIFFERENCE, month, dayOfMonth));
    }

    
Obtains a MinguoDate from a temporal object. 
 This obtains a date in the Minguo calendar system based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of MinguoDate. 
 The conversion typically uses the EPOCH_DAY field, which is standardized across calendar systems. 
 This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, MinguoDate::from. 
Params:
  • temporal –  the temporal object to convert, not null
Throws:
Returns:the date in Minguo calendar system, not null
/**
     * Obtains a {@code MinguoDate} from a temporal object.
     * <p>
     * This obtains a date in the Minguo 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 MinguoDate}.
     * <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 MinguoDate::from}.
     *
     * @param temporal  the temporal object to convert, not null
     * @return the date in Minguo calendar system, not null
     * @throws DateTimeException if unable to convert to a {@code MinguoDate}
     */
    public static MinguoDate from(TemporalAccessor temporal) {
        return MinguoChronology.INSTANCE.date(temporal);
    }

    //-----------------------------------------------------------------------
    
Creates an instance from an ISO date.

Params:
  • isoDate –  the standard local date, validated not null
/**
     * Creates an instance from an ISO date.
     *
     * @param isoDate  the standard local date, validated not null
     */
    MinguoDate(LocalDate isoDate) {
        Objects.requireNonNull(isoDate, "isoDate");
        this.isoDate = isoDate;
    }

    //-----------------------------------------------------------------------
    
Gets the chronology of this date, which is the Minguo calendar system.

 The Chronology represents the calendar system in use. The era and other fields in ChronoField are defined by the chronology. 
Returns:the Minguo chronology, not null
/**
     * Gets the chronology of this date, which is the Minguo 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 Minguo chronology, not null
     */
    @Override
    public MinguoChronology getChronology() {
        return MinguoChronology.INSTANCE;
    }

    
Gets the era applicable at this date.

 The Minguo calendar system has two eras, 'ROC' and 'BEFORE_ROC', defined by MinguoEra. 
Returns:the era applicable at this date, not null
/**
     * Gets the era applicable at this date.
     * <p>
     * The Minguo calendar system has two eras, 'ROC' and 'BEFORE_ROC',
     * defined by {@link MinguoEra}.
     *
     * @return the era applicable at this date, not null
     */
    @Override
    public MinguoEra getEra() {
        return (getProlepticYear() >= 1 ? MinguoEra.ROC : MinguoEra.BEFORE_ROC);
    }

    
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.

Returns:the length of the month in days
/**
     * Returns the length of the month represented by this date.
     * <p>
     * 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() + 1 + YEARS_DIFFERENCE : 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 MinguoDate 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 + YEARS_DIFFERENCE : (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:
/**
     * {@inheritDoc}
     * @throws DateTimeException {@inheritDoc}
     * @throws ArithmeticException {@inheritDoc}
     */
    @Override
    public  MinguoDate with(TemporalAdjuster adjuster) {
        return super.with(adjuster);
    }

    
{@inheritDoc}

Throws:
/**
     * {@inheritDoc}
     * @throws DateTimeException {@inheritDoc}
     * @throws ArithmeticException {@inheritDoc}
     */
    @Override
    public MinguoDate plus(TemporalAmount amount) {
        return super.plus(amount);
    }

    
{@inheritDoc}

Throws:
/**
     * {@inheritDoc}
     * @throws DateTimeException {@inheritDoc}
     * @throws ArithmeticException {@inheritDoc}
     */
    @Override
    public MinguoDate minus(TemporalAmount amount) {
        return super.minus(amount);
    }

    //-----------------------------------------------------------------------
    @Override
    MinguoDate plusYears(long years) {
        return with(isoDate.plusYears(years));
    }

    @Override
    MinguoDate plusMonths(long months) {
        return with(isoDate.plusMonths(months));
    }

    @Override
    MinguoDate plusWeeks(long weeksToAdd) {
        return super.plusWeeks(weeksToAdd);
    }

    @Override
    MinguoDate plusDays(long days) {
        return with(isoDate.plusDays(days));
    }

    @Override
    public MinguoDate plus(long amountToAdd, TemporalUnit unit) {
        return super.plus(amountToAdd, unit);
    }

    @Override
    public MinguoDate minus(long amountToAdd, TemporalUnit unit) {
        return super.minus(amountToAdd, unit);
    }

    @Override
    MinguoDate minusYears(long yearsToSubtract) {
        return super.minusYears(yearsToSubtract);
    }

    @Override
    MinguoDate minusMonths(long monthsToSubtract) {
        return super.minusMonths(monthsToSubtract);
    }

    @Override
    MinguoDate minusWeeks(long weeksToSubtract) {
        return super.minusWeeks(weeksToSubtract);
    }

    @Override
    MinguoDate minusDays(long daysToSubtract) {
        return super.minusDays(daysToSubtract);
    }

    private MinguoDate with(LocalDate newDate) {
        return (newDate.equals(isoDate) ? this : new MinguoDate(newDate));
    }

    @Override        // for javadoc and covariant return type
    @SuppressWarnings("unchecked")
    public final ChronoLocalDateTime<MinguoDate> atTime(LocalTime localTime) {
        return (ChronoLocalDateTime<MinguoDate>)super.atTime(localTime);
    }

    @Override
    public ChronoPeriod until(ChronoLocalDate endDate) {
        Period period = isoDate.until(endDate);
        return getChronology().period(period.getYears(), period.getMonths(), period.getDays());
    }

    @Override  // override for performance
    public long toEpochDay() {
        return isoDate.toEpochDay();
    }

    //-------------------------------------------------------------------------
    
Compares this date to another date, including the chronology.

 Compares this MinguoDate with another ensuring that the date is the same. 
 Only objects of type MinguoDate are compared, other types return false. To compare the dates of two TemporalAccessor instances, including dates in two different chronologies, use ChronoField.EPOCH_DAY as a comparator. 
Params:
  • obj –  the object to check, null returns false
Returns:true if this is equal to the other date
/**
     * Compares this date to another date, including the chronology.
     * <p>
     * Compares this {@code MinguoDate} with another ensuring that the date is the same.
     * <p>
     * Only objects of type {@code MinguoDate} 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 MinguoDate) {
            MinguoDate otherDate = (MinguoDate) obj;
            return this.isoDate.equals(otherDate.isoDate);
        }
        return false;
    }

    
A hash code for this date.

Returns:a suitable hash code based only on the Chronology and the date
/**
     * 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.

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");
    }

    
Writes the object using a
dedicated serialized form.

@serialData

 out.writeByte(8);                 // identifies a MinguoDate
 out.writeInt(get(YEAR));
 out.writeByte(get(MONTH_OF_YEAR));
 out.writeByte(get(DAY_OF_MONTH));

Returns:the instance of Ser, not null
/**
     * Writes the object using a
     * <a href="../../../serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>.
     * @serialData
     * <pre>
     *  out.writeByte(8);                 // identifies a MinguoDate
     *  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.MINGUO_DATE_TYPE, this);
    }

    void writeExternal(DataOutput out) throws IOException {
        // MinguoChronology is implicit in the MINGUO_DATE_TYPE
        out.writeInt(get(YEAR));
        out.writeByte(get(MONTH_OF_YEAR));
        out.writeByte(get(DAY_OF_MONTH));
    }

    static MinguoDate readExternal(DataInput in) throws IOException {
        int year = in.readInt();
        int month = in.readByte();
        int dayOfMonth = in.readByte();
        return MinguoChronology.INSTANCE.date(year, month, dayOfMonth);
    }

}