| /* |
| * 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.chrono; |
| |
| import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH; |
| import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_YEAR; |
| import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_MONTH; |
| import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_YEAR; |
| import static java.time.temporal.ChronoField.DAY_OF_MONTH; |
| import static java.time.temporal.ChronoField.DAY_OF_WEEK; |
| import static java.time.temporal.ChronoField.DAY_OF_YEAR; |
| import static java.time.temporal.ChronoField.EPOCH_DAY; |
| 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; |
| import static java.time.temporal.ChronoField.YEAR_OF_ERA; |
| import static java.time.temporal.TemporalAdjuster.nextOrSame; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.io.InvalidObjectException; |
| import java.io.ObjectStreamException; |
| import java.io.Serializable; |
| import java.time.Clock; |
| import java.time.DateTimeException; |
| import java.time.DayOfWeek; |
| import java.time.Instant; |
| import java.time.LocalDate; |
| import java.time.LocalTime; |
| import java.time.ZoneId; |
| import java.time.format.DateTimeFormatterBuilder; |
| import java.time.format.ResolverStyle; |
| import java.time.format.TextStyle; |
| import java.time.temporal.ChronoField; |
| import java.time.temporal.ChronoUnit; |
| import java.time.temporal.Temporal; |
| import java.time.temporal.TemporalAccessor; |
| import java.time.temporal.TemporalField; |
| import java.time.temporal.TemporalQuery; |
| import java.time.temporal.UnsupportedTemporalTypeException; |
| import java.time.temporal.ValueRange; |
| import java.util.Comparator; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Locale; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.ServiceLoader; |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import sun.util.logging.PlatformLogger; |
| |
| /** |
| * 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 available |
| * for use by any {@code Chronology} implementation: |
| * <pre> |
| * LocalDate isoDate = ... |
| * ThaiBuddhistDate 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 Chronology} 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 Chronology} 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 Chronology} instance may represent a totally different kind of calendar system, |
| * such as the Mayan. |
| * <p> |
| * In practical terms, the {@code Chronology} 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 Chronology} 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> |
| * |
| * <h3 id="addcalendars">Adding New Calendars</h3> |
| * The set of available chronologies can be extended by applications. |
| * Adding a new calendar system requires the writing of an implementation of |
| * {@code Chronology}, {@code ChronoLocalDate} and {@code Era}. |
| * The majority of the logic specific to the calendar system will be in |
| * {@code ChronoLocalDate}. The {@code Chronology} 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.chrono.Chronology' 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 |
| * CLDR specification then the calendar type is the concatenation of the |
| * CLDR type and, if applicable, the CLDR variant, |
| * |
| * @implSpec |
| * 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. |
| * |
| * @since 1.8 |
| */ |
| public abstract class Chronology implements Comparable<Chronology> { |
| |
| /** |
| * ChronoLocalDate order constant. |
| */ |
| static final Comparator<ChronoLocalDate<?>> DATE_ORDER = |
| (Comparator<ChronoLocalDate<?>> & Serializable) (date1, date2) -> { |
| return Long.compare(date1.toEpochDay(), date2.toEpochDay()); |
| }; |
| /** |
| * ChronoLocalDateTime order constant. |
| */ |
| static final Comparator<ChronoLocalDateTime<?>> DATE_TIME_ORDER = |
| (Comparator<ChronoLocalDateTime<?>> & Serializable) (dateTime1, dateTime2) -> { |
| int cmp = Long.compare(dateTime1.toLocalDate().toEpochDay(), dateTime2.toLocalDate().toEpochDay()); |
| if (cmp == 0) { |
| cmp = Long.compare(dateTime1.toLocalTime().toNanoOfDay(), dateTime2.toLocalTime().toNanoOfDay()); |
| } |
| return cmp; |
| }; |
| /** |
| * ChronoZonedDateTime order constant. |
| */ |
| static final Comparator<ChronoZonedDateTime<?>> INSTANT_ORDER = |
| (Comparator<ChronoZonedDateTime<?>> & Serializable) (dateTime1, dateTime2) -> { |
| int cmp = Long.compare(dateTime1.toEpochSecond(), dateTime2.toEpochSecond()); |
| if (cmp == 0) { |
| cmp = Long.compare(dateTime1.toLocalTime().getNano(), dateTime2.toLocalTime().getNano()); |
| } |
| return cmp; |
| }; |
| |
| /** |
| * Map of available calendars by ID. |
| */ |
| private static final ConcurrentHashMap<String, Chronology> CHRONOS_BY_ID = new ConcurrentHashMap<>(); |
| /** |
| * Map of available calendars by calendar type. |
| */ |
| private static final ConcurrentHashMap<String, Chronology> CHRONOS_BY_TYPE = new ConcurrentHashMap<>(); |
| |
| /** |
| * Register a Chronology by its ID and type for lookup by {@link #of(java.lang.String)}. |
| * Chronologies must not be registered until they are completely constructed. |
| * Specifically, not in the constructor of Chronology. |
| * |
| * @param chrono the chronology to register; not null |
| * @return the already registered Chronology if any, may be null |
| */ |
| static Chronology registerChrono(Chronology chrono) { |
| return registerChrono(chrono, chrono.getId()); |
| } |
| |
| /** |
| * Register a Chronology 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 Chronology. |
| * |
| * @param chrono the chronology to register; not null |
| * @param id the ID to register the chronology; not null |
| * @return the already registered Chronology if any, may be null |
| */ |
| static Chronology registerChrono(Chronology chrono, String id) { |
| Chronology prev = CHRONOS_BY_ID.putIfAbsent(id, chrono); |
| if (prev == null) { |
| String type = chrono.getCalendarType(); |
| if (type != null) { |
| CHRONOS_BY_TYPE.putIfAbsent(type, chrono); |
| } |
| } |
| return prev; |
| } |
| |
| /** |
| * Initialization of the maps from id and type to Chronology. |
| * The ServiceLoader is used to find and register any implementations |
| * of {@link java.time.chrono.Chronology} 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 IsoChronology as the test and the final step. |
| * Multiple threads may perform the initialization concurrently. |
| * Only the first registration of each Chronology 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 |
| |
| // Register built-in Chronologies |
| registerChrono(HijrahChronology.INSTANCE); |
| registerChrono(JapaneseChronology.INSTANCE); |
| registerChrono(MinguoChronology.INSTANCE); |
| registerChrono(ThaiBuddhistChronology.INSTANCE); |
| |
| // Register Chronologies from the ServiceLoader |
| @SuppressWarnings("rawtypes") |
| ServiceLoader<Chronology> loader = ServiceLoader.load(Chronology.class, null); |
| for (Chronology chrono : loader) { |
| String id = chrono.getId(); |
| if (id.equals("ISO") || registerChrono(chrono) != null) { |
| // Log the attempt to replace an existing Chronology |
| PlatformLogger logger = PlatformLogger.getLogger("java.time.chrono"); |
| logger.warning("Ignoring duplicate Chronology, from ServiceLoader configuration " + id); |
| } |
| } |
| |
| // finally, register IsoChronology to mark initialization is complete |
| registerChrono(IsoChronology.INSTANCE); |
| return true; |
| } |
| return false; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Obtains an instance of {@code Chronology} from a temporal object. |
| * <p> |
| * This obtains a chronology 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 Chronology}. |
| * <p> |
| * The conversion will obtain the chronology using {@link TemporalQuery#chronology()}. |
| * If the specified temporal object does not have a chronology, {@link IsoChronology} is returned. |
| * <p> |
| * This method matches the signature of the functional interface {@link TemporalQuery} |
| * allowing it to be used in queries via method reference, {@code Chronology::from}. |
| * |
| * @param temporal the temporal to convert, not null |
| * @return the chronology, not null |
| * @throws DateTimeException if unable to convert to an {@code Chronology} |
| */ |
| public static Chronology from(TemporalAccessor temporal) { |
| Objects.requireNonNull(temporal, "temporal"); |
| Chronology obj = temporal.query(TemporalQuery.chronology()); |
| return (obj != null ? obj : IsoChronology.INSTANCE); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Obtains an instance of {@code Chronology} from a locale. |
| * <p> |
| * This returns a {@code Chronology} based on the specified locale, |
| * typically returning {@code IsoChronology}. Other calendar systems |
| * are only returned if they are explicitly selected within the locale. |
| * <p> |
| * The {@link Locale} class provide access to a range of information useful |
| * for localizing an application. This includes the language and region, |
| * such as "en-GB" for English as used in Great Britain. |
| * <p> |
| * The {@code Locale} class also supports an extension mechanism that |
| * can be used to identify a calendar system. The mechanism is a form |
| * of key-value pairs, where the calendar system has the key "ca". |
| * For example, the locale "en-JP-u-ca-japanese" represents the English |
| * language as used in Japan with the Japanese calendar system. |
| * <p> |
| * This method finds the desired calendar system by in a manner equivalent |
| * to passing "ca" to {@link Locale#getUnicodeLocaleType(String)}. |
| * If the "ca" key is not present, then {@code IsoChronology} is returned. |
| * <p> |
| * Note that the behavior of this method differs from the older |
| * {@link java.util.Calendar#getInstance(Locale)} method. |
| * If that method receives a locale of "th_TH" it will return {@code BuddhistCalendar}. |
| * By contrast, this method will return {@code IsoChronology}. |
| * Passing the locale "th-TH-u-ca-buddhist" into either method will |
| * result in the Thai Buddhist calendar system and is therefore the |
| * recommended approach going forward for Thai calendar system localization. |
| * <p> |
| * A similar, but simpler, situation occurs for the Japanese calendar system. |
| * The locale "jp_JP_JP" has previously been used to access the calendar. |
| * However, unlike the Thai locale, "ja_JP_JP" is automatically converted by |
| * {@code Locale} to the modern and recommended form of "ja-JP-u-ca-japanese". |
| * Thus, there is no difference in behavior between this method and |
| * {@code Calendar#getInstance(Locale)}. |
| * |
| * @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 Chronology ofLocale(Locale locale) { |
| Objects.requireNonNull(locale, "locale"); |
| String type = locale.getUnicodeLocaleType("ca"); |
| if (type == null || "iso".equals(type) || "iso8601".equals(type)) { |
| return IsoChronology.INSTANCE; |
| } |
| // Not pre-defined; lookup by the type |
| do { |
| Chronology chrono = CHRONOS_BY_TYPE.get(type); |
| if (chrono != null) { |
| return chrono; |
| } |
| // If not found, do the initialization (once) and repeat the lookup |
| } while (initCache()); |
| |
| // Look for a Chronology using ServiceLoader of the Thread's ContextClassLoader |
| // Application provided Chronologies must not be cached |
| @SuppressWarnings("rawtypes") |
| ServiceLoader<Chronology> loader = ServiceLoader.load(Chronology.class); |
| for (Chronology chrono : loader) { |
| if (type.equals(chrono.getCalendarType())) { |
| return chrono; |
| } |
| } |
| throw new DateTimeException("Unknown calendar system: " + type); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Obtains an instance of {@code Chronology} 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 |
| * CLDR 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 Chronology of(String id) { |
| Objects.requireNonNull(id, "id"); |
| do { |
| Chronology chrono = of0(id); |
| if (chrono != null) { |
| return chrono; |
| } |
| // If not found, do the initialization (once) and repeat the lookup |
| } while (initCache()); |
| |
| // Look for a Chronology using ServiceLoader of the Thread's ContextClassLoader |
| // Application provided Chronologies must not be cached |
| @SuppressWarnings("rawtypes") |
| ServiceLoader<Chronology> loader = ServiceLoader.load(Chronology.class); |
| for (Chronology chrono : loader) { |
| if (id.equals(chrono.getId()) || id.equals(chrono.getCalendarType())) { |
| return chrono; |
| } |
| } |
| throw new DateTimeException("Unknown chronology: " + id); |
| } |
| |
| /** |
| * Obtains an instance of {@code Chronology} 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 Chronology of0(String id) { |
| Chronology 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 Chronology} 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<Chronology> getAvailableChronologies() { |
| initCache(); // force initialization |
| HashSet<Chronology> chronos = new HashSet<>(CHRONOS_BY_ID.values()); |
| |
| /// Add in Chronologies from the ServiceLoader configuration |
| @SuppressWarnings("rawtypes") |
| ServiceLoader<Chronology> loader = ServiceLoader.load(Chronology.class); |
| for (Chronology chrono : loader) { |
| chronos.add(chrono); |
| } |
| return chronos; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Creates an instance. |
| */ |
| protected Chronology() { |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * 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 Chronology |
| */ |
| ChronoLocalDate<?> ensureChronoLocalDate(Temporal temporal) { |
| @SuppressWarnings("unchecked") |
| ChronoLocalDate<?> other = (ChronoLocalDate<?>) temporal; |
| if (this.equals(other.getChronology()) == false) { |
| throw new ClassCastException("Chronology mismatch, expected: " + getId() + ", actual: " + other.getChronology().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 Chronology |
| */ |
| ChronoLocalDateTimeImpl<?> ensureChronoLocalDateTime(Temporal temporal) { |
| @SuppressWarnings("unchecked") |
| ChronoLocalDateTimeImpl<?> other = (ChronoLocalDateTimeImpl<?>) temporal; |
| if (this.equals(other.toLocalDate().getChronology()) == false) { |
| throw new ClassCastException("Chronology mismatch, required: " + getId() |
| + ", supplied: " + other.toLocalDate().getChronology().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 Chronology |
| */ |
| ChronoZonedDateTimeImpl<?> ensureChronoZonedDateTime(Temporal temporal) { |
| @SuppressWarnings("unchecked") |
| ChronoZonedDateTimeImpl<?> other = (ChronoZonedDateTimeImpl<?>) temporal; |
| if (this.equals(other.toLocalDate().getChronology()) == false) { |
| throw new ClassCastException("Chronology mismatch, required: " + getId() |
| + ", supplied: " + other.toLocalDate().getChronology().getId()); |
| } |
| return other; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Gets the ID of the chronology. |
| * <p> |
| * The ID uniquely identifies the {@code Chronology}. |
| * It can be used to lookup the {@code Chronology} using {@link #of(String)}. |
| * |
| * @return the chronology ID, not null |
| * @see #getCalendarType() |
| */ |
| public abstract String getId(); |
| |
| /** |
| * Gets the calendar type of the calendar system. |
| * <p> |
| * The calendar type is an identifier defined by the CLDR and |
| * <em>Unicode Locale Data Markup Language (LDML)</em> specifications |
| * to uniquely identification a calendar. |
| * The {@code getCalendarType} is the concatenation of the CLDR calendar type |
| * and the variant, if applicable, is appended separated by "-". |
| * The calendar type is used to lookup the {@code Chronology} using {@link #of(String)}. |
| * |
| * @return the calendar system type, null if the calendar is not defined by CLDR/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 |
| * @throws ClassCastException if the {@code era} is not of the correct type for the chronology |
| */ |
| public ChronoLocalDate<?> date(Era 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<?> 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 |
| * @throws ClassCastException if the {@code era} is not of the correct type for the chronology |
| */ |
| public ChronoLocalDate<?> dateYearDay(Era 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<?> dateYearDay(int prolepticYear, int dayOfYear); |
| |
| /** |
| * Obtains a local date in this chronology from the epoch-day. |
| * <p> |
| * The definition of {@link ChronoField#EPOCH_DAY EPOCH_DAY} is the same |
| * for all calendar systems, thus it can be used for conversion. |
| * |
| * @param epochDay the epoch day |
| * @return the local date in this chronology, not null |
| * @throws DateTimeException if unable to create the date |
| */ |
| public abstract ChronoLocalDate<?> dateEpochDay(long epochDay); |
| |
| //----------------------------------------------------------------------- |
| /** |
| * 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<?> 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<?> 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<?> dateNow(Clock clock) { |
| Objects.requireNonNull(clock, "clock"); |
| return date(LocalDate.now(clock)); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Obtains a local date in this chronology from another temporal object. |
| * <p> |
| * This obtains a date in this chronology 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 ChronoLocalDate}. |
| * <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 aChronology::date}. |
| * |
| * @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 |
| * @see ChronoLocalDate#from(TemporalAccessor) |
| */ |
| public abstract ChronoLocalDate<?> date(TemporalAccessor temporal); |
| |
| /** |
| * Obtains a local date-time in this chronology from another temporal object. |
| * <p> |
| * This obtains a date-time in this chronology 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 ChronoLocalDateTime}. |
| * <p> |
| * The conversion extracts and combines the {@code ChronoLocalDate} and the |
| * {@code LocalTime} from the temporal object. |
| * Implementations are permitted to perform optimizations such as accessing |
| * those fields that are equivalent to the relevant objects. |
| * The result uses this chronology. |
| * <p> |
| * This method matches the signature of the functional interface {@link TemporalQuery} |
| * allowing it to be used as a query via method reference, {@code aChronology::localDateTime}. |
| * |
| * @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 |
| * @see ChronoLocalDateTime#from(TemporalAccessor) |
| */ |
| public ChronoLocalDateTime<?> 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 {@code ChronoZonedDateTime} in this chronology from another temporal object. |
| * <p> |
| * This obtains a zoned date-time in this chronology 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 ChronoZonedDateTime}. |
| * <p> |
| * The conversion will first obtain a {@code ZoneId} from the temporal object, |
| * falling back to a {@code ZoneOffset} if necessary. It will then try to obtain |
| * an {@code Instant}, falling back to a {@code ChronoLocalDateTime} if necessary. |
| * The result will be either the combination of {@code ZoneId} or {@code ZoneOffset} |
| * with {@code Instant} or {@code ChronoLocalDateTime}. |
| * Implementations are permitted to perform optimizations such as accessing |
| * those fields that are equivalent to the relevant objects. |
| * The result uses this chronology. |
| * <p> |
| * This method matches the signature of the functional interface {@link TemporalQuery} |
| * allowing it to be used as a query via method reference, {@code aChronology::zonedDateTime}. |
| * |
| * @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 |
| * @see ChronoZonedDateTime#from(TemporalAccessor) |
| */ |
| public ChronoZonedDateTime<?> zonedDateTime(TemporalAccessor temporal) { |
| try { |
| ZoneId zone = ZoneId.from(temporal); |
| try { |
| Instant instant = Instant.from(temporal); |
| return zonedDateTime(instant, zone); |
| |
| } catch (DateTimeException ex1) { |
| @SuppressWarnings("rawtypes") |
| ChronoLocalDateTimeImpl 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 {@code ChronoZonedDateTime} in this chronology from an {@code Instant}. |
| * <p> |
| * This obtains 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<?> 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. |
| * <p> |
| * If the chronology makes active use of eras, such as {@code JapaneseChronology} |
| * then the year-of-era will be validated against the era. |
| * For other chronologies, validation is optional. |
| * |
| * @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 to a proleptic-year, |
| * such as if the year is invalid for the era |
| * @throws ClassCastException if the {@code era} is not of the correct type for the chronology |
| */ |
| public abstract int prolepticYear(Era 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 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> 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, |
| * suitable for presentation to the user. |
| * 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 getDisplayName(TextStyle style, Locale locale) { |
| return new DateTimeFormatterBuilder().appendChronologyText(style).toFormatter(locale).format(toTemporal()); |
| } |
| |
| /** |
| * Converts this chronology to a {@code TemporalAccessor}. |
| * <p> |
| * A {@code Chronology} can be fully represented as a {@code TemporalAccessor}. |
| * However, the interface is not implemented by this class as most of the |
| * methods on the interface have no meaning to {@code Chronology}. |
| * <p> |
| * The returned temporal has no supported fields, with the query method |
| * supporting the return of the chronology using {@link TemporalQuery#chronology()}. |
| * |
| * @return a temporal equivalent to this chronology, not null |
| */ |
| private TemporalAccessor toTemporal() { |
| return new TemporalAccessor() { |
| @Override |
| public boolean isSupported(TemporalField field) { |
| return false; |
| } |
| @Override |
| public long getLong(TemporalField field) { |
| throw new UnsupportedTemporalTypeException("Unsupported field: " + field); |
| } |
| @SuppressWarnings("unchecked") |
| @Override |
| public <R> R query(TemporalQuery<R> query) { |
| if (query == TemporalQuery.chronology()) { |
| return (R) Chronology.this; |
| } |
| return TemporalAccessor.super.query(query); |
| } |
| }; |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * Resolves parsed {@code ChronoField} values into a date during parsing. |
| * <p> |
| * Most {@code TemporalField} implementations are resolved using the |
| * resolve method on the field. By contrast, the {@code ChronoField} class |
| * defines fields that only have meaning relative to the chronology. |
| * As such, {@code ChronoField} date fields are resolved here in the |
| * context of a specific chronology. |
| * <p> |
| * The default implementation is suitable for most calendar systems. |
| * If {@link ChronoField#YEAR_OF_ERA} is found without an {@link ChronoField#ERA} |
| * then the last era in {@link #eras()} is used. |
| * The implementation assumes a 7 day week, that the first day-of-month |
| * has the value 1, and that first day-of-year has the value 1. |
| * |
| * @param fieldValues the map of fields to values, which can be updated, not null |
| * @param resolverStyle the requested type of resolve, not null |
| * @return the resolved date, null if insufficient information to create a date |
| * @throws DateTimeException if the date cannot be resolved, typically |
| * because of a conflict in the input data |
| */ |
| public ChronoLocalDate<?> resolveDate(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) { |
| // check epoch-day before inventing era |
| if (fieldValues.containsKey(EPOCH_DAY)) { |
| return dateEpochDay(fieldValues.remove(EPOCH_DAY)); |
| } |
| |
| // fix proleptic month before inventing era |
| Long pMonth = fieldValues.remove(PROLEPTIC_MONTH); |
| if (pMonth != null) { |
| // first day-of-month is likely to be safest for setting proleptic-month |
| // cannot add to year zero, as not all chronologies have a year zero |
| ChronoLocalDate<?> chronoDate = dateNow() |
| .with(DAY_OF_MONTH, 1).with(PROLEPTIC_MONTH, pMonth); |
| addFieldValue(fieldValues, MONTH_OF_YEAR, chronoDate.get(MONTH_OF_YEAR)); |
| addFieldValue(fieldValues, YEAR, chronoDate.get(YEAR)); |
| } |
| |
| // invent era if necessary to resolve year-of-era |
| Long yoeLong = fieldValues.remove(YEAR_OF_ERA); |
| if (yoeLong != null) { |
| Long eraLong = fieldValues.remove(ERA); |
| int yoe = range(YEAR_OF_ERA).checkValidIntValue(yoeLong, YEAR_OF_ERA); |
| if (eraLong != null) { |
| Era eraObj = eraOf(Math.toIntExact(eraLong)); |
| addFieldValue(fieldValues, YEAR, prolepticYear(eraObj, yoe)); |
| } else if (fieldValues.containsKey(YEAR)) { |
| int year = range(YEAR).checkValidIntValue(fieldValues.get(YEAR), YEAR); |
| ChronoLocalDate<?> chronoDate = dateYearDay(year, 1); |
| addFieldValue(fieldValues, YEAR, prolepticYear(chronoDate.getEra(), yoe)); |
| } else { |
| List<Era> eras = eras(); |
| if (eras.isEmpty()) { |
| addFieldValue(fieldValues, YEAR, yoe); |
| } else { |
| Era eraObj = eras.get(eras.size() - 1); |
| addFieldValue(fieldValues, YEAR, prolepticYear(eraObj, yoe)); |
| } |
| } |
| } |
| |
| // build date |
| if (fieldValues.containsKey(YEAR)) { |
| if (fieldValues.containsKey(MONTH_OF_YEAR)) { |
| if (fieldValues.containsKey(DAY_OF_MONTH)) { |
| int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR); |
| int moy = range(MONTH_OF_YEAR).checkValidIntValue(fieldValues.remove(MONTH_OF_YEAR), MONTH_OF_YEAR); |
| int dom = range(DAY_OF_MONTH).checkValidIntValue(fieldValues.remove(DAY_OF_MONTH), DAY_OF_MONTH); |
| return date(y, moy, dom); |
| } |
| if (fieldValues.containsKey(ALIGNED_WEEK_OF_MONTH)) { |
| if (fieldValues.containsKey(ALIGNED_DAY_OF_WEEK_IN_MONTH)) { |
| int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR); |
| int moy = range(MONTH_OF_YEAR).checkValidIntValue(fieldValues.remove(MONTH_OF_YEAR), MONTH_OF_YEAR); |
| int aw = range(ALIGNED_WEEK_OF_MONTH).checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_MONTH), ALIGNED_WEEK_OF_MONTH); |
| int ad = range(ALIGNED_DAY_OF_WEEK_IN_MONTH).checkValidIntValue(fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_MONTH), ALIGNED_DAY_OF_WEEK_IN_MONTH); |
| ChronoLocalDate<?> chronoDate = date(y, moy, 1); |
| return chronoDate.plus((aw - 1) * 7 + (ad - 1), ChronoUnit.DAYS); |
| } |
| if (fieldValues.containsKey(DAY_OF_WEEK)) { |
| int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR); |
| int moy = range(MONTH_OF_YEAR).checkValidIntValue(fieldValues.remove(MONTH_OF_YEAR), MONTH_OF_YEAR); |
| int aw = range(ALIGNED_WEEK_OF_MONTH).checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_MONTH), ALIGNED_WEEK_OF_MONTH); |
| int dow = range(DAY_OF_WEEK).checkValidIntValue(fieldValues.remove(DAY_OF_WEEK), DAY_OF_WEEK); |
| ChronoLocalDate<?> chronoDate = date(y, moy, 1); |
| return chronoDate.plus((aw - 1) * 7, ChronoUnit.DAYS).with(nextOrSame(DayOfWeek.of(dow))); |
| } |
| } |
| } |
| if (fieldValues.containsKey(DAY_OF_YEAR)) { |
| int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR); |
| int doy = range(DAY_OF_YEAR).checkValidIntValue(fieldValues.remove(DAY_OF_YEAR), DAY_OF_YEAR); |
| return dateYearDay(y, doy); |
| } |
| if (fieldValues.containsKey(ALIGNED_WEEK_OF_YEAR)) { |
| if (fieldValues.containsKey(ALIGNED_DAY_OF_WEEK_IN_YEAR)) { |
| int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR); |
| int aw = range(ALIGNED_WEEK_OF_YEAR).checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_YEAR), ALIGNED_WEEK_OF_YEAR); |
| int ad = range(ALIGNED_DAY_OF_WEEK_IN_YEAR).checkValidIntValue(fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_YEAR), ALIGNED_DAY_OF_WEEK_IN_YEAR); |
| ChronoLocalDate<?> chronoDate = dateYearDay(y, 1); |
| return chronoDate.plus((aw - 1) * 7 + (ad - 1), ChronoUnit.DAYS); |
| } |
| if (fieldValues.containsKey(DAY_OF_WEEK)) { |
| int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR); |
| int aw = range(ALIGNED_WEEK_OF_YEAR).checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_YEAR), ALIGNED_WEEK_OF_YEAR); |
| int dow = range(DAY_OF_WEEK).checkValidIntValue(fieldValues.remove(DAY_OF_WEEK), DAY_OF_WEEK); |
| ChronoLocalDate<?> chronoDate = dateYearDay(y, 1); |
| return chronoDate.plus((aw - 1) * 7, ChronoUnit.DAYS).with(nextOrSame(DayOfWeek.of(dow))); |
| } |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Adds a field-value pair to the map, checking for conflicts. |
| * <p> |
| * If the field is not already present, then the field-value pair is added to the map. |
| * If the field is already present and it has the same value as that specified, no action occurs. |
| * If the field is already present and it has a different value to that specified, then |
| * an exception is thrown. |
| * |
| * @param field the field to add, not null |
| * @param value the value to add, not null |
| * @throws DateTimeException if the field is already present with a different value |
| */ |
| void addFieldValue(Map<TemporalField, Long> fieldValues, ChronoField field, long value) { |
| Long old = fieldValues.get(field); // check first for better error message |
| if (old != null && old.longValue() != value) { |
| throw new DateTimeException("Conflict found: " + field + " " + old + " differs from " + field + " " + value); |
| } |
| fieldValues.put(field, value); |
| } |
| |
| //----------------------------------------------------------------------- |
| /** |
| * 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(Chronology 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(Chronology)}. |
| * |
| * @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 Chronology) { |
| return compareTo((Chronology) 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 Chronology using a |
| * <a href="../../../serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>. |
| * <pre> |
| * out.writeByte(1); // identifies this as a Chronology |
| * out.writeUTF(getId()); |
| * </pre> |
| * |
| * @return the instance of {@code Ser}, not null |
| */ |
| protected 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 Chronology readExternal(DataInput in) throws IOException { |
| String id = in.readUTF(); |
| return Chronology.of(id); |
| } |
| |
| } |