ChronoDateImpl.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,
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*
* * Neither the name of JSR-310 nor the names of its contributors
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package org.threeten.bp.chrono;
import java.io.Serializable;
import org.threeten.bp.DateTimeException;
import org.threeten.bp.LocalDate;
import org.threeten.bp.LocalTime;
import org.threeten.bp.jdk8.Jdk8Methods;
import org.threeten.bp.temporal.ChronoUnit;
import org.threeten.bp.temporal.Temporal;
import org.threeten.bp.temporal.TemporalAdjuster;
import org.threeten.bp.temporal.TemporalUnit;
/**
* A date expressed in terms of a standard year-month-day calendar system.
* <p>
* This class is used by applications seeking to handle dates in non-ISO calendar systems.
* For example, the Japanese, Minguo, Thai Buddhist and others.
* <p>
* {@code ChronoLocalDate} is built on the generic concepts of year, month and day.
* The calendar system, represented by a {@link Chronology}, expresses the relationship between
* the fields and this class allows the resulting date to be manipulated.
* <p>
* Note that not all calendar systems are suitable for use with this class.
* For example, the Mayan calendar uses a system that bears no relation to years, months and days.
* <p>
* The API design encourages the use of {@code LocalDate} for the majority of the application.
* This includes code to read and write from a persistent data store, such as a database,
* and to send dates and times across a network. The {@code ChronoLocalDate} instance is then used
* at the user interface level to deal with localized input/output.
*
* <P>Example: </p>
* <pre>
* System.out.printf("Example()%n");
* // Enumerate the list of available calendars and print today for each
* Set<Chrono> chronos = Chrono.getAvailableChronologies();
* for (Chrono chrono : chronos) {
* ChronoLocalDate date = chrono.dateNow();
* System.out.printf(" %20s: %s%n", chrono.getID(), date.toString());
* }
*
* // Print the Hijrah date and calendar
* ChronoLocalDate date = Chrono.of("Hijrah").dateNow();
* int day = date.get(ChronoField.DAY_OF_MONTH);
* int dow = date.get(ChronoField.DAY_OF_WEEK);
* int month = date.get(ChronoField.MONTH_OF_YEAR);
* int year = date.get(ChronoField.YEAR);
* System.out.printf(" Today is %s %s %d-%s-%d%n", date.getChrono().getID(),
* dow, day, month, year);
* // Print today's date and the last day of the year
* ChronoLocalDate now1 = Chrono.of("Hijrah").dateNow();
* ChronoLocalDate first = now1.with(ChronoField.DAY_OF_MONTH, 1)
* .with(ChronoField.MONTH_OF_YEAR, 1);
* ChronoLocalDate last = first.plus(1, ChronoUnit.YEARS)
* .minus(1, ChronoUnit.DAYS);
* System.out.printf(" Today is %s: start: %s; end: %s%n", last.getChrono().getID(),
* first, last);
* </pre>
*
* <h4>Adding Calendars</h4>
* <p> The set of calendars is extensible by defining a subclass of {@link ChronoLocalDate}
* to represent a date instance and an implementation of {@code Chronology}
* to be the factory for the ChronoLocalDate subclass.
* </p>
* <p> To permit the discovery of the additional calendar types the implementation of
* {@code Chronology} must be registered as a Service implementing the {@code Chronology} interface
* in the {@code META-INF/Services} file as per the specification of {@link java.util.ServiceLoader}.
* The subclass must function according to the {@code Chronology} class description and must provide its
* {@link Chronology#getID calendar name} and
* {@link Chronology#getCalendarType() calendar type}. </p>
*
* <h3>Specification for implementors</h3>
* This abstract class must be implemented with care to ensure other classes operate correctly.
* All implementations that can be instantiated must be final, immutable and thread-safe.
* Subclasses should be Serializable wherever possible.
*
* @param <D> the date type
*/
abstract class ChronoDateImpl<D extends ChronoLocalDate>
extends ChronoLocalDate
implements Temporal, TemporalAdjuster, Serializable {
/**
* Serialization version.
*/
private static final long serialVersionUID = 6282433883239719096L;
/**
* Creates an instance.
*/
ChronoDateImpl() {
}
//-----------------------------------------------------------------------
@SuppressWarnings("unchecked")
@Override
public ChronoDateImpl<D> plus(long amountToAdd, TemporalUnit unit) {
if (unit instanceof ChronoUnit) {
ChronoUnit f = (ChronoUnit) unit;
switch (f) {
case DAYS: return plusDays(amountToAdd);
case WEEKS: return plusDays(Jdk8Methods.safeMultiply(amountToAdd, 7));
case MONTHS: return plusMonths(amountToAdd);
case YEARS: return plusYears(amountToAdd);
case DECADES: return plusYears(Jdk8Methods.safeMultiply(amountToAdd, 10));
case CENTURIES: return plusYears(Jdk8Methods.safeMultiply(amountToAdd, 100));
case MILLENNIA: return plusYears(Jdk8Methods.safeMultiply(amountToAdd, 1000));
// case ERAS: throw new DateTimeException("Unable to add era, standard calendar system only has one era");
// case FOREVER: return (period == 0 ? this : (period > 0 ? LocalDate.MAX_DATE : LocalDate.MIN_DATE));
}
throw new DateTimeException(unit + " not valid for chronology " + getChronology().getId());
}
return (ChronoDateImpl<D>) getChronology().ensureChronoLocalDate(unit.addTo(this, amountToAdd));
}
//-----------------------------------------------------------------------
/**
* Returns a copy of this date with the specified period in years added.
* <p>
* This adds the specified period in years to the date.
* In some cases, adding years can cause the resulting date to become invalid.
* If this occurs, then other fields, typically the day-of-month, will be adjusted to ensure
* that the result is valid. Typically this will select the last valid day of the month.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param yearsToAdd the years to add, may be negative
* @return a date based on this one with the years added, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
abstract ChronoDateImpl<D> plusYears(long yearsToAdd);
/**
* Returns a copy of this date with the specified period in months added.
* <p>
* This adds the specified period in months to the date.
* In some cases, adding months can cause the resulting date to become invalid.
* If this occurs, then other fields, typically the day-of-month, will be adjusted to ensure
* that the result is valid. Typically this will select the last valid day of the month.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param monthsToAdd the months to add, may be negative
* @return a date based on this one with the months added, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
abstract ChronoDateImpl<D> plusMonths(long monthsToAdd);
/**
* Returns a copy of this date with the specified period in weeks added.
* <p>
* This adds the specified period in weeks to the date.
* In some cases, adding weeks can cause the resulting date to become invalid.
* If this occurs, then other fields will be adjusted to ensure that the result is valid.
* <p>
* The default implementation uses {@link #plusDays(long)} using a 7 day week.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param weeksToAdd the weeks to add, may be negative
* @return a date based on this one with the weeks added, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
ChronoDateImpl<D> plusWeeks(long weeksToAdd) {
return plusDays(Jdk8Methods.safeMultiply(weeksToAdd, 7));
}
/**
* Returns a copy of this date with the specified number of days added.
* <p>
* This adds the specified period in days to the date.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param daysToAdd the days to add, may be negative
* @return a date based on this one with the days added, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
abstract ChronoDateImpl<D> plusDays(long daysToAdd);
//-----------------------------------------------------------------------
/**
* Returns a copy of this date with the specified period in years subtracted.
* <p>
* This subtracts the specified period in years to the date.
* In some cases, subtracting years can cause the resulting date to become invalid.
* If this occurs, then other fields, typically the day-of-month, will be adjusted to ensure
* that the result is valid. Typically this will select the last valid day of the month.
* <p>
* The default implementation uses {@link #plusYears(long)}.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param yearsToSubtract the years to subtract, may be negative
* @return a date based on this one with the years subtracted, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
ChronoDateImpl<D> minusYears(long yearsToSubtract) {
return (yearsToSubtract == Long.MIN_VALUE ? plusYears(Long.MAX_VALUE).plusYears(1) : plusYears(-yearsToSubtract));
}
/**
* Returns a copy of this date with the specified period in months subtracted.
* <p>
* This subtracts the specified period in months to the date.
* In some cases, subtracting months can cause the resulting date to become invalid.
* If this occurs, then other fields, typically the day-of-month, will be adjusted to ensure
* that the result is valid. Typically this will select the last valid day of the month.
* <p>
* The default implementation uses {@link #plusMonths(long)}.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param monthsToSubtract the months to subtract, may be negative
* @return a date based on this one with the months subtracted, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
ChronoDateImpl<D> minusMonths(long monthsToSubtract) {
return (monthsToSubtract == Long.MIN_VALUE ? plusMonths(Long.MAX_VALUE).plusMonths(1) : plusMonths(-monthsToSubtract));
}
/**
* Returns a copy of this date with the specified period in weeks subtracted.
* <p>
* This subtracts the specified period in weeks to the date.
* In some cases, subtracting weeks can cause the resulting date to become invalid.
* If this occurs, then other fields will be adjusted to ensure that the result is valid.
* <p>
* The default implementation uses {@link #plusWeeks(long)}.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param weeksToSubtract the weeks to subtract, may be negative
* @return a date based on this one with the weeks subtracted, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
ChronoDateImpl<D> minusWeeks(long weeksToSubtract) {
return (weeksToSubtract == Long.MIN_VALUE ? plusWeeks(Long.MAX_VALUE).plusWeeks(1) : plusWeeks(-weeksToSubtract));
}
/**
* Returns a copy of this date with the specified number of days subtracted.
* <p>
* This subtracts the specified period in days to the date.
* <p>
* The default implementation uses {@link #plusDays(long)}.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param daysToSubtract the days to subtract, may be negative
* @return a date based on this one with the days subtracted, not null
* @throws DateTimeException if the result exceeds the supported date range
*/
ChronoDateImpl<D> minusDays(long daysToSubtract) {
return (daysToSubtract == Long.MIN_VALUE ? plusDays(Long.MAX_VALUE).plusDays(1) : plusDays(-daysToSubtract));
}
@Override
public ChronoLocalDateTime<?> atTime(LocalTime localTime) {
return ChronoLocalDateTimeImpl.of(this, localTime);
}
//-----------------------------------------------------------------------
@Override
public long until(Temporal endExclusive, TemporalUnit unit) {
ChronoLocalDate end = getChronology().date(endExclusive);
if (unit instanceof ChronoUnit) {
return LocalDate.from(this).until(end, unit); // TODO: this is wrong
}
return unit.between(this, end);
}
@Override
public ChronoPeriod until(ChronoLocalDate endDate) {
throw new UnsupportedOperationException("Not supported in ThreeTen backport");
}
}