--- a/jdk/src/share/classes/java/time/temporal/Chrono.java Tue Feb 12 16:02:14 2013 +0400
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,858 +0,0 @@
-/*
- * 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,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-/*
- * This file is available under and governed by the GNU General Public
- * License version 2 only, as published by the Free Software Foundation.
- * However, the following notice accompanied the original version of this
- * file:
- *
- * 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
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-package java.time.temporal;
-
-import java.io.DataInput;
-import java.io.DataOutput;
-import java.io.IOException;
-import java.io.InvalidObjectException;
-import java.io.ObjectStreamException;
-import java.time.Clock;
-import java.time.DateTimeException;
-import java.time.Instant;
-import java.time.LocalDate;
-import java.time.LocalTime;
-import java.time.ZoneId;
-import java.time.calendar.HijrahChrono;
-import java.time.calendar.JapaneseChrono;
-import java.time.calendar.MinguoChrono;
-import java.time.calendar.ThaiBuddhistChrono;
-import java.time.format.DateTimeFormatterBuilder;
-import java.time.format.TextStyle;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Locale;
-import java.util.Objects;
-import java.util.ServiceLoader;
-import java.util.Set;
-import java.util.concurrent.ConcurrentHashMap;
-
-/**
- * A calendar system, used to organize and identify dates.
- * <p>
- * The main date and time API is built on the ISO calendar system.
- * This class operates behind the scenes to represent the general concept of a calendar system.
- * For example, the Japanese, Minguo, Thai Buddhist and others.
- * <p>
- * Most other calendar systems also operate on the shared concepts of year, month and day,
- * linked to the cycles of the Earth around the Sun, and the Moon around the Earth.
- * These shared concepts are defined by {@link ChronoField} and are availalbe
- * for use by any {@code Chrono} implementation:
- * <pre>
- * LocalDate isoDate = ...
- * ChronoLocalDate<ThaiBuddhistChrono> thaiDate = ...
- * int isoYear = isoDate.get(ChronoField.YEAR);
- * int thaiYear = thaiDate.get(ChronoField.YEAR);
- * </pre>
- * As shown, although the date objects are in different calendar systems, represented by different
- * {@code Chrono} instances, both can be queried using the same constant on {@code ChronoField}.
- * For a full discussion of the implications of this, see {@link ChronoLocalDate}.
- * In general, the advice is to use the known ISO-based {@code LocalDate}, rather than
- * {@code ChronoLocalDate}.
- * <p>
- * While a {@code Chrono} object typically uses {@code ChronoField} and is based on
- * an era, year-of-era, month-of-year, day-of-month model of a date, this is not required.
- * A {@code Chrono} instance may represent a totally different kind of calendar system,
- * such as the Mayan.
- * <p>
- * In practical terms, the {@code Chrono} instance also acts as a factory.
- * The {@link #of(String)} method allows an instance to be looked up by identifier,
- * while the {@link #ofLocale(Locale)} method allows lookup by locale.
- * <p>
- * The {@code Chrono} instance provides a set of methods to create {@code ChronoLocalDate} instances.
- * The date classes are used to manipulate specific dates.
- * <p><ul>
- * <li> {@link #dateNow() dateNow()}
- * <li> {@link #dateNow(Clock) dateNow(clock)}
- * <li> {@link #dateNow(ZoneId) dateNow(zone)}
- * <li> {@link #date(int, int, int) date(yearProleptic, month, day)}
- * <li> {@link #date(Era, int, int, int) date(era, yearOfEra, month, day)}
- * <li> {@link #dateYearDay(int, int) dateYearDay(yearProleptic, dayOfYear)}
- * <li> {@link #dateYearDay(Era, int, int) dateYearDay(era, yearOfEra, dayOfYear)}
- * <li> {@link #date(TemporalAccessor) date(TemporalAccessor)}
- * </ul><p>
- *
- * <p id="addcalendars">Adding New Calendars</p>
- * The set of available chronologies can be extended by applications.
- * Adding a new calendar system requires the writing of an implementation of
- * {@code Chrono}, {@code ChronoLocalDate} and {@code Era}.
- * The majority of the logic specific to the calendar system will be in
- * {@code ChronoLocalDate}. The {@code Chrono} subclass acts as a factory.
- * <p>
- * To permit the discovery of additional chronologies, the {@link java.util.ServiceLoader ServiceLoader}
- * is used. A file must be added to the {@code META-INF/services} directory with the
- * name 'java.time.temporal.Chrono' listing the implementation classes.
- * See the ServiceLoader for more details on service loading.
- * For lookup by id or calendarType, the system provided calendars are found
- * first followed by application provided calendars.
- * <p>
- * Each chronology must define a chronology ID that is unique within the system.
- * If the chronology represents a calendar system defined by the
- * <em>Unicode Locale Data Markup Language (LDML)</em> specification then that
- * calendar type should also be specified.
- *
- * <h3>Specification for implementors</h3>
- * This 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 <C> the type of the implementing subclass
- * @since 1.8
- */
-public abstract class Chrono<C extends Chrono<C>> implements Comparable<Chrono<?>> {
-
- /**
- * Map of available calendars by ID.
- */
- private static final ConcurrentHashMap<String, Chrono<?>> CHRONOS_BY_ID = new ConcurrentHashMap<>();
- /**
- * Map of available calendars by calendar type.
- */
- private static final ConcurrentHashMap<String, Chrono<?>> CHRONOS_BY_TYPE = new ConcurrentHashMap<>();
-
- /**
- * Register a Chrono by ID and type for lookup by {@link #of(java.lang.String)}.
- * Chronos must not be registered until they are completely constructed.
- * Specifically, not in the constructor of Chrono.
- * @param chrono the chronology to register; not null
- */
- private static void registerChrono(Chrono chrono) {
- Chrono<?> prev = CHRONOS_BY_ID.putIfAbsent(chrono.getId(), chrono);
- if (prev == null) {
- String type = chrono.getCalendarType();
- if (type != null) {
- CHRONOS_BY_TYPE.putIfAbsent(type, chrono);
- }
- }
- }
-
- /**
- * Initialization of the maps from id and type to Chrono.
- * The ServiceLoader is used to find and register any implementations
- * of {@link javax.time.temporal.Chrono} found in the bootclass loader.
- * The built-in chronologies are registered explicitly.
- * Calendars configured via the Thread's context classloader are local
- * to that thread and are ignored.
- * <p>
- * The initialization is done only once using the registration
- * of the ISOChrono as the test and the final step.
- * Multiple threads may perform the initialization concurrently.
- * Only the first registration of each Chrono is retained by the
- * ConcurrentHashMap.
- * @return true if the cache was initialized
- */
- private static boolean initCache() {
- if (CHRONOS_BY_ID.get("ISO") == null) {
- // Initialization is incomplete
- @SuppressWarnings("rawtypes")
- ServiceLoader<Chrono> loader = ServiceLoader.load(Chrono.class, null);
- for (Chrono<?> chrono : loader) {
- registerChrono(chrono);
- }
-
- // Register these calendars; the ServiceLoader configuration is not used
- registerChrono(HijrahChrono.INSTANCE);
- registerChrono(JapaneseChrono.INSTANCE);
- registerChrono(MinguoChrono.INSTANCE);
- registerChrono(ThaiBuddhistChrono.INSTANCE);
-
- // finally, register ISOChrono to mark initialization is complete
- registerChrono(ISOChrono.INSTANCE);
- return true;
- }
- return false;
- }
-
- //-----------------------------------------------------------------------
- /**
- * Obtains an instance of {@code Chrono} from a temporal object.
- * <p>
- * A {@code TemporalAccessor} represents some form of date and time information.
- * This factory converts the arbitrary temporal object to an instance of {@code Chrono}.
- * If the specified temporal object does not have a chronology, {@link ISOChrono} is returned.
- * <p>
- * The conversion will obtain the chronology using {@link Queries#chrono()}.
- * <p>
- * This method matches the signature of the functional interface {@link TemporalQuery}
- * allowing it to be used in queries via method reference, {@code Chrono::from}.
- *
- * @param temporal the temporal to convert, not null
- * @return the chronology, not null
- * @throws DateTimeException if unable to convert to an {@code Chrono}
- */
- public static Chrono<?> from(TemporalAccessor temporal) {
- Objects.requireNonNull(temporal, "temporal");
- Chrono<?> obj = temporal.query(Queries.chrono());
- return (obj != null ? obj : ISOChrono.INSTANCE);
- }
-
- //-----------------------------------------------------------------------
- /**
- * Obtains an instance of {@code Chrono} from a locale.
- * <p>
- * The locale can be used to identify a calendar.
- * This uses {@link Locale#getUnicodeLocaleType(String)} to obtain the "ca" key
- * to identify the calendar system.
- * <p>
- * If the locale does not contain calendar system information, the standard
- * ISO calendar system is used.
- *
- * @param locale the locale to use to obtain the calendar system, not null
- * @return the calendar system associated with the locale, not null
- * @throws DateTimeException if the locale-specified calendar cannot be found
- */
- public static Chrono<?> ofLocale(Locale locale) {
- Objects.requireNonNull(locale, "locale");
- String type = locale.getUnicodeLocaleType("ca");
- if (type == null) {
- return ISOChrono.INSTANCE;
- } else if ("iso".equals(type) || "iso8601".equals(type)) {
- return ISOChrono.INSTANCE;
- } else {
- Chrono<?> chrono = CHRONOS_BY_TYPE.get(type);
- if (chrono == null) {
- throw new DateTimeException("Unknown calendar system: " + type);
- }
- return chrono;
- }
- }
-
- //-----------------------------------------------------------------------
- /**
- * Obtains an instance of {@code Chrono} from a chronology ID or
- * calendar system type.
- * <p>
- * This returns a chronology based on either the ID or the type.
- * The {@link #getId() chronology ID} uniquely identifies the chronology.
- * The {@link #getCalendarType() calendar system type} is defined by the LDML specification.
- * <p>
- * The chronology may be a system chronology or a chronology
- * provided by the application via ServiceLoader configuration.
- * <p>
- * Since some calendars can be customized, the ID or type typically refers
- * to the default customization. For example, the Gregorian calendar can have multiple
- * cutover dates from the Julian, but the lookup only provides the default cutover date.
- *
- * @param id the chronology ID or calendar system type, not null
- * @return the chronology with the identifier requested, not null
- * @throws DateTimeException if the chronology cannot be found
- */
- public static Chrono<?> of(String id) {
- Objects.requireNonNull(id, "id");
- do {
- Chrono chrono = of0(id);
- if (chrono != null) {
- return chrono;
- }
- // If not found, do the initialization (once) and repeat the lookup
- } while (initCache());
-
- // Look for a Chrono using ServiceLoader of the Thread's ContextClassLoader
- // Application provided Chronologies must not be cached
- @SuppressWarnings("rawtypes")
- ServiceLoader<Chrono> loader = ServiceLoader.load(Chrono.class);
- for (Chrono<?> chrono : loader) {
- if (id.equals(chrono.getId()) || id.equals(chrono.getCalendarType())) {
- return chrono;
- }
- }
- throw new DateTimeException("Unknown chronology: " + id);
- }
-
- /**
- * Obtains an instance of {@code Chrono} from a chronology ID or
- * calendar system type.
- *
- * @param id the chronology ID or calendar system type, not null
- * @return the chronology with the identifier requested, or {@code null} if not found
- */
- private static Chrono<?> of0(String id) {
- Chrono<?> chrono = CHRONOS_BY_ID.get(id);
- if (chrono == null) {
- chrono = CHRONOS_BY_TYPE.get(id);
- }
- return chrono;
- }
-
- /**
- * Returns the available chronologies.
- * <p>
- * Each returned {@code Chrono} is available for use in the system.
- * The set of chronologies includes the system chronologies and
- * any chronologies provided by the application via ServiceLoader
- * configuration.
- *
- * @return the independent, modifiable set of the available chronology IDs, not null
- */
- public static Set<Chrono<?>> getAvailableChronologies() {
- initCache(); // force initialization
- HashSet<Chrono<?>> chronos = new HashSet<>(CHRONOS_BY_ID.values());
-
- /// Add in Chronologies from the ServiceLoader configuration
- @SuppressWarnings("rawtypes")
- ServiceLoader<Chrono> loader = ServiceLoader.load(Chrono.class);
- for (Chrono<?> chrono : loader) {
- chronos.add(chrono);
- }
- return chronos;
- }
-
- //-----------------------------------------------------------------------
- /**
- * Obtains a local date-time from the a date and time.
- * <p>
- * This combines a {@link ChronoLocalDate}, which provides the {@code Chrono},
- * with a {@link LocalTime} to produce a {@link ChronoLocalDateTime}.
- * <p>
- * This method is intended for chronology implementations.
- * It uses a standard implementation that is shared for all chronologies.
- *
- * @param <R> the chronology of the date
- * @param date the date, not null
- * @param time the time, not null
- * @return the local date-time combining the input date and time, not null
- */
- public static <R extends Chrono<R>> ChronoLocalDateTime<R> dateTime(ChronoLocalDate<R> date, LocalTime time) {
- return ChronoLocalDateTimeImpl.of(date, time);
- }
-
- //-----------------------------------------------------------------------
- /**
- * Creates an instance.
- */
- protected Chrono() {
- }
-
- //-----------------------------------------------------------------------
- /**
- * Casts the {@code Temporal} to {@code ChronoLocalDate} with the same chronology.
- *
- * @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 Chrono
- */
- ChronoLocalDate<C> ensureChronoLocalDate(Temporal temporal) {
- @SuppressWarnings("unchecked")
- ChronoLocalDate<C> other = (ChronoLocalDate<C>) temporal;
- if (this.equals(other.getChrono()) == false) {
- throw new ClassCastException("Chrono mismatch, expected: " + getId() + ", actual: " + other.getChrono().getId());
- }
- return other;
- }
-
- /**
- * Casts the {@code Temporal} to {@code ChronoLocalDateTime} with the same chronology.
- *
- * @param temporal a date-time to cast, not null
- * @return the date-time checked and cast to {@code ChronoLocalDateTime}, not null
- * @throws ClassCastException if the date-time cannot be cast to ChronoLocalDateTimeImpl
- * or the chronology is not equal this Chrono
- */
- ChronoLocalDateTimeImpl<C> ensureChronoLocalDateTime(Temporal temporal) {
- @SuppressWarnings("unchecked")
- ChronoLocalDateTimeImpl<C> other = (ChronoLocalDateTimeImpl<C>) temporal;
- if (this.equals(other.getDate().getChrono()) == false) {
- throw new ClassCastException("Chrono mismatch, required: " + getId()
- + ", supplied: " + other.getDate().getChrono().getId());
- }
- return other;
- }
-
- /**
- * Casts the {@code Temporal} to {@code ChronoZonedDateTimeImpl} with the same chronology.
- *
- * @param temporal a date-time to cast, not null
- * @return the date-time checked and cast to {@code ChronoZonedDateTimeImpl}, not null
- * @throws ClassCastException if the date-time cannot be cast to ChronoZonedDateTimeImpl
- * or the chronology is not equal this Chrono
- */
- ChronoZonedDateTimeImpl<C> ensureChronoZonedDateTime(Temporal temporal) {
- @SuppressWarnings("unchecked")
- ChronoZonedDateTimeImpl<C> other = (ChronoZonedDateTimeImpl<C>) temporal;
- if (this.equals(other.getDate().getChrono()) == false) {
- throw new ClassCastException("Chrono mismatch, required: " + getId()
- + ", supplied: " + other.getDate().getChrono().getId());
- }
- return other;
- }
-
- //-----------------------------------------------------------------------
- /**
- * Gets the ID of the chronology.
- * <p>
- * The ID uniquely identifies the {@code Chrono}.
- * It can be used to lookup the {@code Chrono} using {@link #of(String)}.
- *
- * @return the chronology ID, not null
- * @see #getCalendarType()
- */
- public abstract String getId();
-
- /**
- * Gets the calendar type of the underlying calendar system.
- * <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 Chrono} using {@link #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, null if the calendar is not defined by LDML
- * @see #getId()
- */
- public abstract String getCalendarType();
-
- //-----------------------------------------------------------------------
- /**
- * Obtains a local date in this chronology from the era, year-of-era,
- * month-of-year and day-of-month fields.
- *
- * @param era the era of the correct type for the chronology, not null
- * @param yearOfEra the chronology year-of-era
- * @param month the chronology month-of-year
- * @param dayOfMonth the chronology day-of-month
- * @return the local date in this chronology, not null
- * @throws DateTimeException if unable to create the date
- */
- public ChronoLocalDate<C> date(Era<C> era, int yearOfEra, int month, int dayOfMonth) {
- return date(prolepticYear(era, yearOfEra), month, dayOfMonth);
- }
-
- /**
- * Obtains a local date in this chronology from the proleptic-year,
- * month-of-year and day-of-month fields.
- *
- * @param prolepticYear the chronology proleptic-year
- * @param month the chronology month-of-year
- * @param dayOfMonth the chronology day-of-month
- * @return the local date in this chronology, not null
- * @throws DateTimeException if unable to create the date
- */
- public abstract ChronoLocalDate<C> date(int prolepticYear, int month, int dayOfMonth);
-
- /**
- * Obtains a local date in this chronology from the era, year-of-era and
- * day-of-year fields.
- *
- * @param era the era of the correct type for the chronology, not null
- * @param yearOfEra the chronology year-of-era
- * @param dayOfYear the chronology day-of-year
- * @return the local date in this chronology, not null
- * @throws DateTimeException if unable to create the date
- */
- public ChronoLocalDate<C> dateYearDay(Era<C> era, int yearOfEra, int dayOfYear) {
- return dateYearDay(prolepticYear(era, yearOfEra), dayOfYear);
- }
-
- /**
- * Obtains a local date in this chronology from the proleptic-year and
- * day-of-year fields.
- *
- * @param prolepticYear the chronology proleptic-year
- * @param dayOfYear the chronology day-of-year
- * @return the local date in this chronology, not null
- * @throws DateTimeException if unable to create the date
- */
- public abstract ChronoLocalDate<C> dateYearDay(int prolepticYear, int dayOfYear);
-
- /**
- * Obtains a local date in this chronology from another temporal object.
- * <p>
- * This creates a date in this chronology based on the specified {@code TemporalAccessor}.
- * <p>
- * The standard mechanism for conversion between date types is the
- * {@link ChronoField#EPOCH_DAY local epoch-day} field.
- *
- * @param temporal the temporal object to convert, not null
- * @return the local date in this chronology, not null
- * @throws DateTimeException if unable to create the date
- */
- public abstract ChronoLocalDate<C> date(TemporalAccessor temporal);
-
- //-----------------------------------------------------------------------
- /**
- * Obtains the current local date in this chronology 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.
- * <p>
- * This implementation uses {@link #dateNow(Clock)}.
- *
- * @return the current local date using the system clock and default time-zone, not null
- * @throws DateTimeException if unable to create the date
- */
- public ChronoLocalDate<C> dateNow() {
- return dateNow(Clock.systemDefaultZone());
- }
-
- /**
- * Obtains the current local date in this chronology 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 local date using the system clock, not null
- * @throws DateTimeException if unable to create the date
- */
- public ChronoLocalDate<C> dateNow(ZoneId zone) {
- return dateNow(Clock.system(zone));
- }
-
- /**
- * Obtains the current local date in this chronology 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 {@link Clock dependency injection}.
- *
- * @param clock the clock to use, not null
- * @return the current local date, not null
- * @throws DateTimeException if unable to create the date
- */
- public ChronoLocalDate<C> dateNow(Clock clock) {
- Objects.requireNonNull(clock, "clock");
- return date(LocalDate.now(clock));
- }
-
- //-----------------------------------------------------------------------
- /**
- * Obtains a local date-time in this chronology from another temporal object.
- * <p>
- * This creates a date-time in this chronology based on the specified {@code TemporalAccessor}.
- * <p>
- * The date of the date-time should be equivalent to that obtained by calling
- * {@link #date(TemporalAccessor)}.
- * The standard mechanism for conversion between time types is the
- * {@link ChronoField#NANO_OF_DAY nano-of-day} field.
- *
- * @param temporal the temporal object to convert, not null
- * @return the local date-time in this chronology, not null
- * @throws DateTimeException if unable to create the date-time
- */
- public ChronoLocalDateTime<C> localDateTime(TemporalAccessor temporal) {
- try {
- return date(temporal).atTime(LocalTime.from(temporal));
- } catch (DateTimeException ex) {
- throw new DateTimeException("Unable to obtain ChronoLocalDateTime from TemporalAccessor: " + temporal.getClass(), ex);
- }
- }
-
- /**
- * Obtains a zoned date-time in this chronology from another temporal object.
- * <p>
- * This creates a date-time in this chronology based on the specified {@code TemporalAccessor}.
- * <p>
- * This should obtain a {@code ZoneId} using {@link ZoneId#from(TemporalAccessor)}.
- * The date-time should be obtained by obtaining an {@code Instant}.
- * If that fails, the local date-time should be used.
- *
- * @param temporal the temporal object to convert, not null
- * @return the zoned date-time in this chronology, not null
- * @throws DateTimeException if unable to create the date-time
- */
- public ChronoZonedDateTime<C> zonedDateTime(TemporalAccessor temporal) {
- try {
- ZoneId zone = ZoneId.from(temporal);
- try {
- Instant instant = Instant.from(temporal);
- return zonedDateTime(instant, zone);
-
- } catch (DateTimeException ex1) {
- ChronoLocalDateTimeImpl<C> cldt = ensureChronoLocalDateTime(localDateTime(temporal));
- return ChronoZonedDateTimeImpl.ofBest(cldt, zone, null);
- }
- } catch (DateTimeException ex) {
- throw new DateTimeException("Unable to obtain ChronoZonedDateTime from TemporalAccessor: " + temporal.getClass(), ex);
- }
- }
-
- /**
- * Obtains a zoned date-time in this chronology from an {@code Instant}.
- * <p>
- * This creates a zoned date-time with the same instant as that specified.
- *
- * @param instant the instant to create the date-time from, not null
- * @param zone the time-zone, not null
- * @return the zoned date-time, not null
- * @throws DateTimeException if the result exceeds the supported range
- */
- public ChronoZonedDateTime<C> zonedDateTime(Instant instant, ZoneId zone) {
- return ChronoZonedDateTimeImpl.ofInstant(this, instant, zone);
- }
-
- //-----------------------------------------------------------------------
- /**
- * Checks if the specified year is a leap year.
- * <p>
- * A leap-year is a year of a longer length than normal.
- * The exact meaning is determined by the chronology according to the following constraints.
- * <p><ul>
- * <li>a leap-year must imply a year-length longer than a non leap-year.
- * <li>a chronology that does not support the concept of a year must return false.
- * </ul><p>
- *
- * @param prolepticYear the proleptic-year to check, not validated for range
- * @return true if the year is a leap year
- */
- public abstract boolean isLeapYear(long prolepticYear);
-
- /**
- * Calculates the proleptic-year given the era and year-of-era.
- * <p>
- * This combines the era and year-of-era into the single proleptic-year field.
- *
- * @param era the era of the correct type for the chronology, not null
- * @param yearOfEra the chronology year-of-era
- * @return the proleptic-year
- * @throws DateTimeException if unable to convert
- */
- public abstract int prolepticYear(Era<C> era, int yearOfEra);
-
- /**
- * Creates the chronology era object from the numeric value.
- * <p>
- * The era is, conceptually, the largest division of the time-line.
- * Most calendar systems have a single epoch dividing the time-line into two eras.
- * However, some have multiple eras, such as one for the reign of each leader.
- * The exact meaning is determined by the chronology according to the following constraints.
- * <p>
- * The era in use at 1970-01-01 must have the value 1.
- * Later eras must have sequentially higher values.
- * Earlier eras must have sequentially lower values.
- * Each chronology must refer to an enum or similar singleton to provide the era values.
- * <p>
- * This method returns the singleton era of the correct type for the specified era value.
- *
- * @param eraValue the era value
- * @return the calendar system era, not null
- * @throws DateTimeException if unable to create the era
- */
- public abstract Era<C> eraOf(int eraValue);
-
- /**
- * Gets the list of eras for the chronology.
- * <p>
- * Most calendar systems have an era, within which the year has meaning.
- * If the calendar system does not support the concept of eras, an empty
- * list must be returned.
- *
- * @return the list of eras for the chronology, may be immutable, not null
- */
- public abstract List<Era<C>> eras();
-
- //-----------------------------------------------------------------------
- /**
- * Gets the range of valid values for the specified field.
- * <p>
- * All fields can be expressed as a {@code long} integer.
- * This method returns an object that describes the valid range for that value.
- * <p>
- * Note that the result only describes the minimum and maximum valid values
- * and it is important not to read too much into them. For example, there
- * could be values within the range that are invalid for the field.
- * <p>
- * This method will return a result whether or not the chronology supports the field.
- *
- * @param field the field to get the range for, not null
- * @return the range of valid values for the field, not null
- * @throws DateTimeException if the range for the field cannot be obtained
- */
- public abstract ValueRange range(ChronoField field);
-
- //-----------------------------------------------------------------------
- /**
- * Gets the textual representation of this chronology.
- * <p>
- * This returns the textual name used to identify the chronology.
- * The parameters control the style of the returned text and the locale.
- *
- * @param style the style of the text required, not null
- * @param locale the locale to use, not null
- * @return the text value of the chronology, not null
- */
- public String getText(TextStyle style, Locale locale) {
- return new DateTimeFormatterBuilder().appendChronoText(style).toFormatter(locale).print(new TemporalAccessor() {
- @Override
- public boolean isSupported(TemporalField field) {
- return false;
- }
- @Override
- public long getLong(TemporalField field) {
- throw new DateTimeException("Unsupported field: " + field);
- }
- @SuppressWarnings("unchecked")
- @Override
- public <R> R query(TemporalQuery<R> query) {
- if (query == Queries.chrono()) {
- return (R) Chrono.this;
- }
- return TemporalAccessor.super.query(query);
- }
- });
- }
-
- //-----------------------------------------------------------------------
- /**
- * Compares this chronology to another chronology.
- * <p>
- * The comparison order first by the chronology ID string, then by any
- * additional information specific to the subclass.
- * It is "consistent with equals", as defined by {@link Comparable}.
- * <p>
- * The default implementation compares the chronology ID.
- * Subclasses must compare any additional state that they store.
- *
- * @param other the other chronology to compare to, not null
- * @return the comparator value, negative if less, positive if greater
- */
- @Override
- public int compareTo(Chrono<?> other) {
- return getId().compareTo(other.getId());
- }
-
- /**
- * Checks if this chronology is equal to another chronology.
- * <p>
- * The comparison is based on the entire state of the object.
- * <p>
- * The default implementation checks the type and calls {@link #compareTo(Chrono)}.
- *
- * @param obj the object to check, null returns false
- * @return true if this is equal to the other chronology
- */
- @Override
- public boolean equals(Object obj) {
- if (this == obj) {
- return true;
- }
- if (obj instanceof Chrono) {
- return compareTo((Chrono<?>) obj) == 0;
- }
- return false;
- }
-
- /**
- * A hash code for this chronology.
- * <p>
- * The default implementation is based on the ID and class.
- * Subclasses should add any additional state that they store.
- *
- * @return a suitable hash code
- */
- @Override
- public int hashCode() {
- return getClass().hashCode() ^ getId().hashCode();
- }
-
- //-----------------------------------------------------------------------
- /**
- * Outputs this chronology as a {@code String}, using the ID.
- *
- * @return a string representation of this chronology, not null
- */
- @Override
- public String toString() {
- return getId();
- }
-
- //-----------------------------------------------------------------------
- /**
- * Writes the object using a
- * <a href="../../../serialized-form.html#java.time.temporal.Ser">dedicated serialized form</a>.
- * <pre>
- * out.writeByte(7); // identifies this as a Chrono
- * out.writeUTF(chronoId);
- * </pre>
- *
- * @return the instance of {@code Ser}, not null
- */
- private Object writeReplace() {
- return new Ser(Ser.CHRONO_TYPE, this);
- }
-
- /**
- * Defend against malicious streams.
- * @return never
- * @throws InvalidObjectException always
- */
- private Object readResolve() throws ObjectStreamException {
- throw new InvalidObjectException("Deserialization via serialization delegate");
- }
-
- void writeExternal(DataOutput out) throws IOException {
- out.writeUTF(getId());
- }
-
- static Chrono<?> readExternal(DataInput in) throws IOException {
- String id = in.readUTF();
- return Chrono.of(id);
- }
-
-}