/*
* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
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*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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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
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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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.
* <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/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.
*/
private static final long serialVersionUID = 1300372329181994526L;
/**
* The underlying date.
*/
private final transient LocalDate isoDate;
//-----------------------------------------------------------------------
/**
* 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 {@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 {@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 {@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 {@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.
*
* @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.
* <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.
* <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.
* <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 DateTimeException {@inheritDoc}
* @throws ArithmeticException {@inheritDoc}
*/
@Override
public MinguoDate with(TemporalAdjuster adjuster) {
return super.with(adjuster);
}
/**
* {@inheritDoc}
* @throws DateTimeException {@inheritDoc}
* @throws ArithmeticException {@inheritDoc}
*/
@Override
public MinguoDate plus(TemporalAmount amount) {
return super.plus(amount);
}
/**
* {@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.
* <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.
*
* @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
* <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);
}
}