Java example source code file (ChronoLocalDateImpl.java)
The ChronoLocalDateImpl.java Java example source code/*
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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
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*
* * 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.
*
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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package java.time.chrono;
import static java.time.temporal.ChronoField.DAY_OF_MONTH;
import static java.time.temporal.ChronoField.ERA;
import static java.time.temporal.ChronoField.MONTH_OF_YEAR;
import static java.time.temporal.ChronoField.PROLEPTIC_MONTH;
import static java.time.temporal.ChronoField.YEAR_OF_ERA;
import java.io.Serializable;
import java.time.DateTimeException;
import java.time.temporal.ChronoUnit;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalAdjuster;
import java.time.temporal.TemporalAmount;
import java.time.temporal.TemporalField;
import java.time.temporal.TemporalUnit;
import java.time.temporal.UnsupportedTemporalTypeException;
import java.time.temporal.ValueRange;
import java.util.Objects;
/**
* 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 java.time.chrono.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:
* <pre>
* System.out.printf("Example()%n");
* // Enumerate the list of available calendars and print today for each
* Set<Chronology> chronos = Chronology.getAvailableChronologies();
* for (Chronology chrono : chronos) {
* ChronoLocalDate date = chrono.dateNow();
* System.out.printf(" %20s: %s%n", chrono.getID(), date.toString());
* }
*
* // Print the Hijrah date and calendar
* ChronoLocalDate date = Chronology.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.getChronology().getID(),
* dow, day, month, year);
* // Print today's date and the last day of the year
* ChronoLocalDate now1 = Chronology.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.getChronology().getID(),
* first, last);
* </pre>
*
* <h3>Adding Calendars
* <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 java.time.chrono.Chronology#getId() chronlogy ID} and {@link Chronology#getCalendarType() calendar type}. </p>
*
* @implSpec
* 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 ChronoLocalDate of this date-time
* @since 1.8
*/
abstract class ChronoLocalDateImpl<D extends ChronoLocalDate>
implements ChronoLocalDate, Temporal, TemporalAdjuster, Serializable {
/**
* Serialization version.
*/
private static final long serialVersionUID = 6282433883239719096L;
/**
* Casts the {@code Temporal} to {@code ChronoLocalDate} ensuring it bas the specified chronology.
*
* @param chrono the chronology to check for, not null
* @param temporal a date-time to cast, not null
* @return the date-time checked and cast to {@code ChronoLocalDate}, not null
* @throws ClassCastException if the date-time cannot be cast to ChronoLocalDate
* or the chronology is not equal this Chronology
*/
static <D extends ChronoLocalDate> D ensureValid(Chronology chrono, Temporal temporal) {
@SuppressWarnings("unchecked")
D other = (D) temporal;
if (chrono.equals(other.getChronology()) == false) {
throw new ClassCastException("Chronology mismatch, expected: " + chrono.getId() + ", actual: " + other.getChronology().getId());
}
return other;
}
//-----------------------------------------------------------------------
/**
* Creates an instance.
*/
ChronoLocalDateImpl() {
}
@Override
@SuppressWarnings("unchecked")
public D with(TemporalAdjuster adjuster) {
return (D) ChronoLocalDate.super.with(adjuster);
}
@Override
@SuppressWarnings("unchecked")
public D with(TemporalField field, long value) {
return (D) ChronoLocalDate.super.with(field, value);
}
//-----------------------------------------------------------------------
@Override
@SuppressWarnings("unchecked")
public D plus(TemporalAmount amount) {
return (D) ChronoLocalDate.super.plus(amount);
}
//-----------------------------------------------------------------------
@Override
@SuppressWarnings("unchecked")
public 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(Math.multiplyExact(amountToAdd, 7));
case MONTHS: return plusMonths(amountToAdd);
case YEARS: return plusYears(amountToAdd);
case DECADES: return plusYears(Math.multiplyExact(amountToAdd, 10));
case CENTURIES: return plusYears(Math.multiplyExact(amountToAdd, 100));
case MILLENNIA: return plusYears(Math.multiplyExact(amountToAdd, 1000));
case ERAS: return with(ERA, Math.addExact(getLong(ERA), amountToAdd));
}
throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit);
}
return (D) ChronoLocalDate.super.plus(amountToAdd, unit);
}
@Override
@SuppressWarnings("unchecked")
public D minus(TemporalAmount amount) {
return (D) ChronoLocalDate.super.minus(amount);
}
@Override
@SuppressWarnings("unchecked")
public D minus(long amountToSubtract, TemporalUnit unit) {
return (D) ChronoLocalDate.super.minus(amountToSubtract, unit);
}
//-----------------------------------------------------------------------
/**
* 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 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 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
*/
D plusWeeks(long weeksToAdd) {
return plusDays(Math.multiplyExact(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 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
*/
@SuppressWarnings("unchecked")
D minusYears(long yearsToSubtract) {
return (yearsToSubtract == Long.MIN_VALUE ? ((ChronoLocalDateImpl<D>)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
*/
@SuppressWarnings("unchecked")
D minusMonths(long monthsToSubtract) {
return (monthsToSubtract == Long.MIN_VALUE ? ((ChronoLocalDateImpl<D>)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
*/
@SuppressWarnings("unchecked")
D minusWeeks(long weeksToSubtract) {
return (weeksToSubtract == Long.MIN_VALUE ? ((ChronoLocalDateImpl<D>)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
*/
@SuppressWarnings("unchecked")
D minusDays(long daysToSubtract) {
return (daysToSubtract == Long.MIN_VALUE ? ((ChronoLocalDateImpl<D>)plusDays(Long.MAX_VALUE)).plusDays(1) : plusDays(-daysToSubtract));
}
//-----------------------------------------------------------------------
@Override
public long until(Temporal endExclusive, TemporalUnit unit) {
Objects.requireNonNull(endExclusive, "endExclusive");
ChronoLocalDate end = getChronology().date(endExclusive);
if (unit instanceof ChronoUnit) {
switch ((ChronoUnit) unit) {
case DAYS: return daysUntil(end);
case WEEKS: return daysUntil(end) / 7;
case MONTHS: return monthsUntil(end);
case YEARS: return monthsUntil(end) / 12;
case DECADES: return monthsUntil(end) / 120;
case CENTURIES: return monthsUntil(end) / 1200;
case MILLENNIA: return monthsUntil(end) / 12000;
case ERAS: return end.getLong(ERA) - getLong(ERA);
}
throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit);
}
Objects.requireNonNull(unit, "unit");
return unit.between(this, end);
}
private long daysUntil(ChronoLocalDate end) {
return end.toEpochDay() - toEpochDay(); // no overflow
}
private long monthsUntil(ChronoLocalDate end) {
ValueRange range = getChronology().range(MONTH_OF_YEAR);
if (range.getMaximum() != 12) {
throw new IllegalStateException("ChronoLocalDateImpl only supports Chronologies with 12 months per year");
}
long packed1 = getLong(PROLEPTIC_MONTH) * 32L + get(DAY_OF_MONTH); // no overflow
long packed2 = end.getLong(PROLEPTIC_MONTH) * 32L + end.get(DAY_OF_MONTH); // no overflow
return (packed2 - packed1) / 32;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof ChronoLocalDate) {
return compareTo((ChronoLocalDate) obj) == 0;
}
return false;
}
@Override
public int hashCode() {
long epDay = toEpochDay();
return getChronology().hashCode() ^ ((int) (epDay ^ (epDay >>> 32)));
}
@Override
public String toString() {
// getLong() reduces chances of exceptions in toString()
long yoe = getLong(YEAR_OF_ERA);
long moy = getLong(MONTH_OF_YEAR);
long dom = getLong(DAY_OF_MONTH);
StringBuilder buf = new StringBuilder(30);
buf.append(getChronology().toString())
.append(" ")
.append(getEra())
.append(" ")
.append(yoe)
.append(moy < 10 ? "-0" : "-").append(moy)
.append(dom < 10 ? "-0" : "-").append(dom);
return buf.toString();
}
}
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