/* |
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* Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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* Copyright (c) 2012, Stephen Colebourne & Michael Nascimento Santos |
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* |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* * Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* * Redistributions in binary form must reproduce the above copyright notice, |
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* this list of conditions and the following disclaimer in the documentation |
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* and/or other materials provided with the distribution. |
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* |
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* * Neither the name of JSR-310 nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package java.time.chrono; |
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import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH; |
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import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_YEAR; |
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import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_MONTH; |
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import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_YEAR; |
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import static java.time.temporal.ChronoField.DAY_OF_MONTH; |
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import static java.time.temporal.ChronoField.MONTH_OF_YEAR; |
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import static java.time.temporal.ChronoField.YEAR; |
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import java.io.DataInput; |
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import java.io.DataOutput; |
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import java.io.IOException; |
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import java.io.InvalidObjectException; |
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import java.io.ObjectInputStream; |
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import java.io.Serializable; |
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import java.time.Clock; |
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import java.time.DateTimeException; |
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import java.time.LocalDate; |
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import java.time.LocalTime; |
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import java.time.Period; |
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import java.time.ZoneId; |
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import java.time.temporal.ChronoField; |
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import java.time.temporal.TemporalAccessor; |
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import java.time.temporal.TemporalAdjuster; |
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import java.time.temporal.TemporalAmount; |
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import java.time.temporal.TemporalField; |
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import java.time.temporal.TemporalQuery; |
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import java.time.temporal.TemporalUnit; |
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import java.time.temporal.UnsupportedTemporalTypeException; |
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import java.time.temporal.ValueRange; |
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import java.util.Calendar; |
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import java.util.Objects; |
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import sun.util.calendar.CalendarDate; |
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import sun.util.calendar.LocalGregorianCalendar; |
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/** |
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* A date in the Japanese Imperial calendar system. |
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* <p> |
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* This date operates using the {@linkplain JapaneseChronology Japanese Imperial calendar}. |
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* This calendar system is primarily used in Japan. |
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* <p> |
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* The Japanese Imperial calendar system is the same as the ISO calendar system |
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* apart from the era-based year numbering. The proleptic-year is defined to be |
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* equal to the ISO proleptic-year. |
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* <p> |
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* Japan introduced the Gregorian calendar starting with Meiji 6. |
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* Only Meiji and later eras are supported; |
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* dates before Meiji 6, January 1 are not supported. |
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* <p> |
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* For example, the Japanese year "Heisei 24" corresponds to ISO year "2012".<br> |
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* Calling {@code japaneseDate.get(YEAR_OF_ERA)} will return 24.<br> |
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* Calling {@code japaneseDate.get(YEAR)} will return 2012.<br> |
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* Calling {@code japaneseDate.get(ERA)} will return 2, corresponding to |
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* {@code JapaneseChronology.ERA_HEISEI}.<br> |
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* <p> |
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* This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a> |
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* class; programmers should treat instances that are |
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* {@linkplain #equals(Object) equal} as interchangeable and should not |
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* use instances for synchronization, or unpredictable behavior may |
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* occur. For example, in a future release, synchronization may fail. |
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* The {@code equals} method should be used for comparisons. |
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* |
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* @implSpec |
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* This class is immutable and thread-safe. |
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* |
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* @since 1.8 |
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*/ |
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@jdk.internal.ValueBased |
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public final class JapaneseDate |
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extends ChronoLocalDateImpl<JapaneseDate> |
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implements ChronoLocalDate, Serializable { |
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/** |
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* Serialization version. |
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*/ |
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@java.io.Serial |
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private static final long serialVersionUID = -305327627230580483L; |
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/** |
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* The underlying ISO local date. |
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*/ |
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private final transient LocalDate isoDate; |
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/** |
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* The JapaneseEra of this date. |
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*/ |
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private final transient JapaneseEra era; |
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/** |
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* The Japanese imperial calendar year of this date. |
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*/ |
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private final transient int yearOfEra; |
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/** |
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* The first day supported by the JapaneseChronology is Meiji 6, January 1st. |
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*/ |
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static final LocalDate MEIJI_6_ISODATE = LocalDate.of(1873, 1, 1); |
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//----------------------------------------------------------------------- |
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/** |
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* Obtains the current {@code JapaneseDate} from the system clock in the default time-zone. |
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* <p> |
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* This will query the {@link Clock#systemDefaultZone() system clock} in the default |
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* time-zone to obtain the current date. |
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* <p> |
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* Using this method will prevent the ability to use an alternate clock for testing |
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* because the clock is hard-coded. |
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* |
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* @return the current date using the system clock and default time-zone, not null |
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*/ |
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public static JapaneseDate now() { |
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return now(Clock.systemDefaultZone()); |
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} |
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/** |
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* Obtains the current {@code JapaneseDate} from the system clock in the specified time-zone. |
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* <p> |
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* This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date. |
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* Specifying the time-zone avoids dependence on the default time-zone. |
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* <p> |
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* Using this method will prevent the ability to use an alternate clock for testing |
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* because the clock is hard-coded. |
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* |
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* @param zone the zone ID to use, not null |
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* @return the current date using the system clock, not null |
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*/ |
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public static JapaneseDate now(ZoneId zone) { |
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return now(Clock.system(zone)); |
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} |
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/** |
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* Obtains the current {@code JapaneseDate} from the specified clock. |
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* <p> |
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* This will query the specified clock to obtain the current date - today. |
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* Using this method allows the use of an alternate clock for testing. |
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* The alternate clock may be introduced using {@linkplain Clock dependency injection}. |
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* |
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* @param clock the clock to use, not null |
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* @return the current date, not null |
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* @throws DateTimeException if the current date cannot be obtained |
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*/ |
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public static JapaneseDate now(Clock clock) { |
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return new JapaneseDate(LocalDate.now(clock)); |
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} |
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/** |
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* Obtains a {@code JapaneseDate} representing a date in the Japanese calendar |
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* system from the era, year-of-era, month-of-year and day-of-month fields. |
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* <p> |
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* This returns a {@code JapaneseDate} with the specified fields. |
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* The day must be valid for the year and month, otherwise an exception will be thrown. |
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* <p> |
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* The Japanese month and day-of-month are the same as those in the |
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* ISO calendar system. They are not reset when the era changes. |
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* For example: |
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* <pre> |
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* 6th Jan Showa 64 = ISO 1989-01-06 |
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* 7th Jan Showa 64 = ISO 1989-01-07 |
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* 8th Jan Heisei 1 = ISO 1989-01-08 |
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* 9th Jan Heisei 1 = ISO 1989-01-09 |
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* </pre> |
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* |
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* @param era the Japanese era, not null |
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* @param yearOfEra the Japanese year-of-era |
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* @param month the Japanese month-of-year, from 1 to 12 |
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* @param dayOfMonth the Japanese day-of-month, from 1 to 31 |
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* @return the date in Japanese calendar system, not null |
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* @throws DateTimeException if the value of any field is out of range, |
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* or if the day-of-month is invalid for the month-year, |
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* or if the date is not a Japanese era |
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*/ |
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public static JapaneseDate of(JapaneseEra era, int yearOfEra, int month, int dayOfMonth) { |
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Objects.requireNonNull(era, "era"); |
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LocalGregorianCalendar.Date jdate = JapaneseChronology.JCAL.newCalendarDate(null); |
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jdate.setEra(era.getPrivateEra()).setDate(yearOfEra, month, dayOfMonth); |
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if (!JapaneseChronology.JCAL.validate(jdate)) { |
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throw new DateTimeException("year, month, and day not valid for Era"); |
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} |
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LocalDate date = LocalDate.of(jdate.getNormalizedYear(), month, dayOfMonth); |
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return new JapaneseDate(era, yearOfEra, date); |
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} |
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/** |
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* Obtains a {@code JapaneseDate} representing a date in the Japanese calendar |
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* system from the proleptic-year, month-of-year and day-of-month fields. |
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* <p> |
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* This returns a {@code JapaneseDate} with the specified fields. |
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* The day must be valid for the year and month, otherwise an exception will be thrown. |
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* <p> |
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* The Japanese proleptic year, month and day-of-month are the same as those |
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* in the ISO calendar system. They are not reset when the era changes. |
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* |
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* @param prolepticYear the Japanese proleptic-year |
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* @param month the Japanese month-of-year, from 1 to 12 |
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* @param dayOfMonth the Japanese day-of-month, from 1 to 31 |
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* @return the date in Japanese calendar system, not null |
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* @throws DateTimeException if the value of any field is out of range, |
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* or if the day-of-month is invalid for the month-year |
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*/ |
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public static JapaneseDate of(int prolepticYear, int month, int dayOfMonth) { |
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return new JapaneseDate(LocalDate.of(prolepticYear, month, dayOfMonth)); |
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} |
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/** |
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* Obtains a {@code JapaneseDate} representing a date in the Japanese calendar |
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* system from the era, year-of-era and day-of-year fields. |
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* <p> |
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* This returns a {@code JapaneseDate} with the specified fields. |
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* The day must be valid for the year, otherwise an exception will be thrown. |
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* <p> |
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* The day-of-year in this factory is expressed relative to the start of the year-of-era. |
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* This definition changes the normal meaning of day-of-year only in those years |
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* where the year-of-era is reset to one due to a change in the era. |
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* For example: |
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* <pre> |
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* 6th Jan Showa 64 = day-of-year 6 |
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* 7th Jan Showa 64 = day-of-year 7 |
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* 8th Jan Heisei 1 = day-of-year 1 |
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* 9th Jan Heisei 1 = day-of-year 2 |
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* </pre> |
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* |
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* @param era the Japanese era, not null |
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* @param yearOfEra the Japanese year-of-era |
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* @param dayOfYear the chronology day-of-year, from 1 to 366 |
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* @return the date in Japanese calendar system, not null |
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* @throws DateTimeException if the value of any field is out of range, |
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* or if the day-of-year is invalid for the year |
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*/ |
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static JapaneseDate ofYearDay(JapaneseEra era, int yearOfEra, int dayOfYear) { |
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Objects.requireNonNull(era, "era"); |
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CalendarDate firstDay = era.getPrivateEra().getSinceDate(); |
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LocalGregorianCalendar.Date jdate = JapaneseChronology.JCAL.newCalendarDate(null); |
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jdate.setEra(era.getPrivateEra()); |
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if (yearOfEra == 1) { |
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jdate.setDate(yearOfEra, firstDay.getMonth(), firstDay.getDayOfMonth() + dayOfYear - 1); |
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} else { |
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jdate.setDate(yearOfEra, 1, dayOfYear); |
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} |
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JapaneseChronology.JCAL.normalize(jdate); |
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if (era.getPrivateEra() != jdate.getEra() || yearOfEra != jdate.getYear()) { |
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throw new DateTimeException("Invalid parameters"); |
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} |
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LocalDate localdate = LocalDate.of(jdate.getNormalizedYear(), |
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jdate.getMonth(), jdate.getDayOfMonth()); |
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return new JapaneseDate(era, yearOfEra, localdate); |
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} |
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/** |
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* Obtains a {@code JapaneseDate} from a temporal object. |
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* <p> |
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* This obtains a date in the Japanese calendar system based on the specified temporal. |
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* A {@code TemporalAccessor} represents an arbitrary set of date and time information, |
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* which this factory converts to an instance of {@code JapaneseDate}. |
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* <p> |
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* The conversion typically uses the {@link ChronoField#EPOCH_DAY EPOCH_DAY} |
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* field, which is standardized across calendar systems. |
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* <p> |
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* This method matches the signature of the functional interface {@link TemporalQuery} |
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* allowing it to be used as a query via method reference, {@code JapaneseDate::from}. |
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* |
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* @param temporal the temporal object to convert, not null |
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* @return the date in Japanese calendar system, not null |
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* @throws DateTimeException if unable to convert to a {@code JapaneseDate} |
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*/ |
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public static JapaneseDate from(TemporalAccessor temporal) { |
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return JapaneseChronology.INSTANCE.date(temporal); |
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} |
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//----------------------------------------------------------------------- |
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/** |
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* Creates an instance from an ISO date. |
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* |
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* @param isoDate the standard local date, validated not null |
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*/ |
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JapaneseDate(LocalDate isoDate) { |
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if (isoDate.isBefore(MEIJI_6_ISODATE)) { |
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throw new DateTimeException("JapaneseDate before Meiji 6 is not supported"); |
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} |
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LocalGregorianCalendar.Date jdate = toPrivateJapaneseDate(isoDate); |
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this.era = JapaneseEra.toJapaneseEra(jdate.getEra()); |
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this.yearOfEra = jdate.getYear(); |
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this.isoDate = isoDate; |
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} |
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/** |
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* Constructs a {@code JapaneseDate}. This constructor does NOT validate the given parameters, |
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* and {@code era} and {@code year} must agree with {@code isoDate}. |
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* |
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* @param era the era, validated not null |
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* @param year the year-of-era, validated |
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* @param isoDate the standard local date, validated not null |
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*/ |
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JapaneseDate(JapaneseEra era, int year, LocalDate isoDate) { |
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if (isoDate.isBefore(MEIJI_6_ISODATE)) { |
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throw new DateTimeException("JapaneseDate before Meiji 6 is not supported"); |
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} |
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this.era = era; |
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this.yearOfEra = year; |
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this.isoDate = isoDate; |
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} |
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//----------------------------------------------------------------------- |
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/** |
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* Gets the chronology of this date, which is the Japanese calendar system. |
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* <p> |
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* The {@code Chronology} represents the calendar system in use. |
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* The era and other fields in {@link ChronoField} are defined by the chronology. |
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* |
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* @return the Japanese chronology, not null |
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*/ |
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@Override |
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public JapaneseChronology getChronology() { |
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return JapaneseChronology.INSTANCE; |
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} |
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/** |
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* Gets the era applicable at this date. |
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* <p> |
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* The Japanese calendar system has multiple eras defined by {@link JapaneseEra}. |
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* |
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* @return the era applicable at this date, not null |
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*/ |
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@Override |
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public JapaneseEra getEra() { |
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return era; |
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} |
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/** |
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* Returns the length of the month represented by this date. |
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* <p> |
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* This returns the length of the month in days. |
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* Month lengths match those of the ISO calendar system. |
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* |
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* @return the length of the month in days |
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*/ |
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@Override |
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public int lengthOfMonth() { |
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return isoDate.lengthOfMonth(); |
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} |
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@Override |
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public int lengthOfYear() { |
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Calendar jcal = Calendar.getInstance(JapaneseChronology.LOCALE); |
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jcal.set(Calendar.ERA, era.getValue() + JapaneseEra.ERA_OFFSET); |
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jcal.set(yearOfEra, isoDate.getMonthValue() - 1, isoDate.getDayOfMonth()); |
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return jcal.getActualMaximum(Calendar.DAY_OF_YEAR); |
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} |
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//----------------------------------------------------------------------- |
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/** |
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* Checks if the specified field is supported. |
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* <p> |
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* This checks if this date can be queried for the specified field. |
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* If false, then calling the {@link #range(TemporalField) range} and |
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* {@link #get(TemporalField) get} methods will throw an exception. |
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* <p> |
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* If the field is a {@link ChronoField} then the query is implemented here. |
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* The supported fields are: |
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* <ul> |
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* <li>{@code DAY_OF_WEEK} |
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* <li>{@code DAY_OF_MONTH} |
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* <li>{@code DAY_OF_YEAR} |
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* <li>{@code EPOCH_DAY} |
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* <li>{@code MONTH_OF_YEAR} |
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* <li>{@code PROLEPTIC_MONTH} |
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* <li>{@code YEAR_OF_ERA} |
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* <li>{@code YEAR} |
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* <li>{@code ERA} |
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* </ul> |
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* All other {@code ChronoField} instances will return false. |
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* <p> |
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* If the field is not a {@code ChronoField}, then the result of this method |
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* is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)} |
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* passing {@code this} as the argument. |
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* Whether the field is supported is determined by the field. |
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* |
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* @param field the field to check, null returns false |
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* @return true if the field is supported on this date, false if not |
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*/ |
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@Override |
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public boolean isSupported(TemporalField field) { |
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if (field == ALIGNED_DAY_OF_WEEK_IN_MONTH || field == ALIGNED_DAY_OF_WEEK_IN_YEAR || |
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field == ALIGNED_WEEK_OF_MONTH || field == ALIGNED_WEEK_OF_YEAR) { |
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return false; |
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} |
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return super.isSupported(field); |
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} |
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@Override |
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public ValueRange range(TemporalField field) { |
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if (field instanceof ChronoField) { |
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if (isSupported(field)) { |
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ChronoField f = (ChronoField) field; |
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switch (f) { |
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case DAY_OF_MONTH: return ValueRange.of(1, lengthOfMonth()); |
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case DAY_OF_YEAR: return ValueRange.of(1, lengthOfYear()); |
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case YEAR_OF_ERA: { |
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Calendar jcal = Calendar.getInstance(JapaneseChronology.LOCALE); |
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jcal.set(Calendar.ERA, era.getValue() + JapaneseEra.ERA_OFFSET); |
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jcal.set(yearOfEra, isoDate.getMonthValue() - 1, isoDate.getDayOfMonth()); |
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return ValueRange.of(1, jcal.getActualMaximum(Calendar.YEAR)); |
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} |
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} |
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return getChronology().range(f); |
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} |
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throw new UnsupportedTemporalTypeException("Unsupported field: " + field); |
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} |
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return field.rangeRefinedBy(this); |
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} |
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@Override |
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public long getLong(TemporalField field) { |
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if (field instanceof ChronoField) { |
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// same as ISO: |
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// DAY_OF_WEEK, DAY_OF_MONTH, EPOCH_DAY, MONTH_OF_YEAR, PROLEPTIC_MONTH, YEAR |
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// |
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// calendar specific fields |
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// DAY_OF_YEAR, YEAR_OF_ERA, ERA |
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switch ((ChronoField) field) { |
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case ALIGNED_DAY_OF_WEEK_IN_MONTH: |
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case ALIGNED_DAY_OF_WEEK_IN_YEAR: |
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case ALIGNED_WEEK_OF_MONTH: |
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case ALIGNED_WEEK_OF_YEAR: |
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throw new UnsupportedTemporalTypeException("Unsupported field: " + field); |
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case YEAR_OF_ERA: |
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return yearOfEra; |
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case ERA: |
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return era.getValue(); |
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case DAY_OF_YEAR: |
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Calendar jcal = Calendar.getInstance(JapaneseChronology.LOCALE); |
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jcal.set(Calendar.ERA, era.getValue() + JapaneseEra.ERA_OFFSET); |
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jcal.set(yearOfEra, isoDate.getMonthValue() - 1, isoDate.getDayOfMonth()); |
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return jcal.get(Calendar.DAY_OF_YEAR); |
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} |
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return isoDate.getLong(field); |
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} |
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return field.getFrom(this); |
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} |
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/** |
|
* Returns a {@code LocalGregorianCalendar.Date} converted from the given {@code isoDate}. |
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* |
|
* @param isoDate the local date, not null |
|
* @return a {@code LocalGregorianCalendar.Date}, not null |
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*/ |
|
private static LocalGregorianCalendar.Date toPrivateJapaneseDate(LocalDate isoDate) { |
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LocalGregorianCalendar.Date jdate = JapaneseChronology.JCAL.newCalendarDate(null); |
|
sun.util.calendar.Era sunEra = JapaneseEra.privateEraFrom(isoDate); |
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int year = isoDate.getYear(); |
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if (sunEra != null) { |
|
year -= sunEra.getSinceDate().getYear() - 1; |
|
} |
|
jdate.setEra(sunEra).setYear(year).setMonth(isoDate.getMonthValue()).setDayOfMonth(isoDate.getDayOfMonth()); |
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JapaneseChronology.JCAL.normalize(jdate); |
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return jdate; |
|
} |
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//----------------------------------------------------------------------- |
|
@Override |
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public JapaneseDate with(TemporalField field, long newValue) { |
|
if (field instanceof ChronoField chronoField) { |
|
if (getLong(chronoField) == newValue) { // getLong() validates for supported fields |
|
return this; |
|
} |
|
switch (chronoField) { |
|
case YEAR_OF_ERA: |
|
case YEAR: |
|
case ERA: { |
|
int nvalue = getChronology().range(chronoField).checkValidIntValue(newValue, chronoField); |
|
switch (chronoField) { |
|
case YEAR_OF_ERA: |
|
return this.withYear(nvalue); |
|
case YEAR: |
|
return with(isoDate.withYear(nvalue)); |
|
case ERA: { |
|
return this.withYear(JapaneseEra.of(nvalue), yearOfEra); |
|
} |
|
} |
|
} |
|
} |
|
// YEAR, PROLEPTIC_MONTH and others are same as ISO |
|
return with(isoDate.with(field, newValue)); |
|
} |
|
return super.with(field, newValue); |
|
} |
|
/** |
|
* {@inheritDoc} |
|
* @throws DateTimeException {@inheritDoc} |
|
* @throws ArithmeticException {@inheritDoc} |
|
*/ |
|
@Override |
|
public JapaneseDate with(TemporalAdjuster adjuster) { |
|
return super.with(adjuster); |
|
} |
|
/** |
|
* {@inheritDoc} |
|
* @throws DateTimeException {@inheritDoc} |
|
* @throws ArithmeticException {@inheritDoc} |
|
*/ |
|
@Override |
|
public JapaneseDate plus(TemporalAmount amount) { |
|
return super.plus(amount); |
|
} |
|
/** |
|
* {@inheritDoc} |
|
* @throws DateTimeException {@inheritDoc} |
|
* @throws ArithmeticException {@inheritDoc} |
|
*/ |
|
@Override |
|
public JapaneseDate minus(TemporalAmount amount) { |
|
return super.minus(amount); |
|
} |
|
//----------------------------------------------------------------------- |
|
/** |
|
* Returns a copy of this date with the year altered. |
|
* <p> |
|
* This method changes the year of the date. |
|
* If the month-day is invalid for the year, then the previous valid day |
|
* will be selected instead. |
|
* <p> |
|
* This instance is immutable and unaffected by this method call. |
|
* |
|
* @param era the era to set in the result, not null |
|
* @param yearOfEra the year-of-era to set in the returned date |
|
* @return a {@code JapaneseDate} based on this date with the requested year, never null |
|
* @throws DateTimeException if {@code year} is invalid |
|
*/ |
|
private JapaneseDate withYear(JapaneseEra era, int yearOfEra) { |
|
int year = JapaneseChronology.INSTANCE.prolepticYear(era, yearOfEra); |
|
return with(isoDate.withYear(year)); |
|
} |
|
/** |
|
* Returns a copy of this date with the year-of-era altered. |
|
* <p> |
|
* This method changes the year-of-era of the date. |
|
* If the month-day is invalid for the year, then the previous valid day |
|
* will be selected instead. |
|
* <p> |
|
* This instance is immutable and unaffected by this method call. |
|
* |
|
* @param year the year to set in the returned date |
|
* @return a {@code JapaneseDate} based on this date with the requested year-of-era, never null |
|
* @throws DateTimeException if {@code year} is invalid |
|
*/ |
|
private JapaneseDate withYear(int year) { |
|
return withYear(getEra(), year); |
|
} |
|
//----------------------------------------------------------------------- |
|
@Override |
|
JapaneseDate plusYears(long years) { |
|
return with(isoDate.plusYears(years)); |
|
} |
|
@Override |
|
JapaneseDate plusMonths(long months) { |
|
return with(isoDate.plusMonths(months)); |
|
} |
|
@Override |
|
JapaneseDate plusWeeks(long weeksToAdd) { |
|
return with(isoDate.plusWeeks(weeksToAdd)); |
|
} |
|
@Override |
|
JapaneseDate plusDays(long days) { |
|
return with(isoDate.plusDays(days)); |
|
} |
|
@Override |
|
public JapaneseDate plus(long amountToAdd, TemporalUnit unit) { |
|
return super.plus(amountToAdd, unit); |
|
} |
|
@Override |
|
public JapaneseDate minus(long amountToAdd, TemporalUnit unit) { |
|
return super.minus(amountToAdd, unit); |
|
} |
|
@Override |
|
JapaneseDate minusYears(long yearsToSubtract) { |
|
return super.minusYears(yearsToSubtract); |
|
} |
|
@Override |
|
JapaneseDate minusMonths(long monthsToSubtract) { |
|
return super.minusMonths(monthsToSubtract); |
|
} |
|
@Override |
|
JapaneseDate minusWeeks(long weeksToSubtract) { |
|
return super.minusWeeks(weeksToSubtract); |
|
} |
|
@Override |
|
JapaneseDate minusDays(long daysToSubtract) { |
|
return super.minusDays(daysToSubtract); |
|
} |
|
private JapaneseDate with(LocalDate newDate) { |
|
return (newDate.equals(isoDate) ? this : new JapaneseDate(newDate)); |
|
} |
|
@Override // for javadoc and covariant return type |
|
@SuppressWarnings("unchecked") |
|
public final ChronoLocalDateTime<JapaneseDate> atTime(LocalTime localTime) { |
|
return (ChronoLocalDateTime<JapaneseDate>)super.atTime(localTime); |
|
} |
|
@Override |
|
public ChronoPeriod until(ChronoLocalDate endDate) { |
|
Period period = isoDate.until(endDate); |
|
return getChronology().period(period.getYears(), period.getMonths(), period.getDays()); |
|
} |
|
@Override // override for performance |
|
public long toEpochDay() { |
|
return isoDate.toEpochDay(); |
|
} |
|
//------------------------------------------------------------------------- |
|
/** |
|
* Compares this date to another date, including the chronology. |
|
* <p> |
|
* Compares this {@code JapaneseDate} with another ensuring that the date is the same. |
|
* <p> |
|
* Only objects of type {@code JapaneseDate} are compared, other types return false. |
|
* To compare the dates of two {@code TemporalAccessor} instances, including dates |
|
* in two different chronologies, use {@link ChronoField#EPOCH_DAY} as a comparator. |
|
* |
|
* @param obj the object to check, null returns false |
|
* @return true if this is equal to the other date |
|
*/ |
|
@Override // override for performance |
|
public boolean equals(Object obj) { |
|
if (this == obj) { |
|
return true; |
|
} |
|
return (obj instanceof JapaneseDate otherDate) |
|
&& this.isoDate.equals(otherDate.isoDate); |
|
} |
|
/** |
|
* A hash code for this date. |
|
* |
|
* @return a suitable hash code based only on the Chronology and the date |
|
*/ |
|
@Override // override for performance |
|
public int hashCode() { |
|
return getChronology().getId().hashCode() ^ isoDate.hashCode(); |
|
} |
|
//----------------------------------------------------------------------- |
|
/** |
|
* Defend against malicious streams. |
|
* |
|
* @param s the stream to read |
|
* @throws InvalidObjectException always |
|
*/ |
|
@java.io.Serial |
|
private void readObject(ObjectInputStream s) throws InvalidObjectException { |
|
throw new InvalidObjectException("Deserialization via serialization delegate"); |
|
} |
|
/** |
|
* Writes the object using a |
|
* <a href="{@docRoot}/serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>. |
|
* @serialData |
|
* <pre> |
|
* out.writeByte(4); // identifies a JapaneseDate |
|
* out.writeInt(get(YEAR)); |
|
* out.writeByte(get(MONTH_OF_YEAR)); |
|
* out.writeByte(get(DAY_OF_MONTH)); |
|
* </pre> |
|
* |
|
* @return the instance of {@code Ser}, not null |
|
*/ |
|
@java.io.Serial |
|
private Object writeReplace() { |
|
return new Ser(Ser.JAPANESE_DATE_TYPE, this); |
|
} |
|
void writeExternal(DataOutput out) throws IOException { |
|
// JapaneseChronology is implicit in the JAPANESE_DATE_TYPE |
|
out.writeInt(get(YEAR)); |
|
out.writeByte(get(MONTH_OF_YEAR)); |
|
out.writeByte(get(DAY_OF_MONTH)); |
|
} |
|
static JapaneseDate readExternal(DataInput in) throws IOException { |
|
int year = in.readInt(); |
|
int month = in.readByte(); |
|
int dayOfMonth = in.readByte(); |
|
return JapaneseChronology.INSTANCE.date(year, month, dayOfMonth); |
|
} |
|
} |