1 /*

     2  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 /*

    27  * Copyright (c) 2012, Stephen Colebourne & Michael Nascimento Santos

    28  *

    29  * All rights reserved.

    30  *

    31  * Redistribution and use in source and binary forms, with or without

    32  * modification, are permitted provided that the following conditions are met:

    33  *

    34  *  * Redistributions of source code must retain the above copyright notice,

    35  *    this list of conditions and the following disclaimer.

    36  *

    37  *  * Redistributions in binary form must reproduce the above copyright notice,

    38  *    this list of conditions and the following disclaimer in the documentation

    39  *    and/or other materials provided with the distribution.

    40  *

    41  *  * Neither the name of JSR-310 nor the names of its contributors

    42  *    may be used to endorse or promote products derived from this software

    43  *    without specific prior written permission.

    44  *

    45  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

    46  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

    47  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

    48  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR

    49  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    50  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    51  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    52  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

    53  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

    54  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

    55  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    56  */

    57 package java.time.chrono;

    58 

    59 import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH;

    60 import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_YEAR;

    61 import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_MONTH;

    62 import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_YEAR;

    63 import static java.time.temporal.ChronoField.DAY_OF_MONTH;

    64 import static java.time.temporal.ChronoField.MONTH_OF_YEAR;

    65 import static java.time.temporal.ChronoField.YEAR;

    66 

    67 import java.io.IOException;

    68 import java.io.ObjectInput;

    69 import java.io.ObjectOutput;

    70 import java.io.Serializable;

    71 import java.time.Clock;

    72 import java.time.DateTimeException;

    73 import java.time.DayOfWeek;

    74 import java.time.LocalDate;

    75 import java.time.LocalTime;

    76 import java.time.Period;

    77 import java.time.ZoneId;

    78 import java.time.temporal.ChronoField;

    79 import java.time.temporal.TemporalQuery;

    80 import java.time.temporal.TemporalAccessor;

    81 import java.time.temporal.TemporalAdjuster;

    82 import java.time.temporal.TemporalAmount;

    83 import java.time.temporal.TemporalField;

    84 import java.time.temporal.TemporalUnit;

    85 import java.time.temporal.ValueRange;

    86 import java.util.Objects;

    87 

    88 /**

    89  * A date in the Hijrah calendar system.

    90  * <p>

    91  * This date operates using the {@linkplain HijrahChronology Hijrah calendar}.

    92  * <p>

    93  * The Hijrah calendar has a different total of days in a year than

    94  * Gregorian calendar, and a month is based on the period of a complete

    95  * revolution of the moon around the earth (as between successive new moons).

    96  * The calendar cycles becomes longer and unstable, and sometimes a manual

    97  * adjustment (for entering deviation) is necessary for correctness

    98  * because of the complex algorithm.

    99  * <p>

   100  * HijrahDate supports the manual adjustment feature by providing a configuration

   101  * file. The configuration file contains the adjustment (deviation) data with following format.

   102  * <pre>

   103  *   StartYear/StartMonth(0-based)-EndYear/EndMonth(0-based):Deviation day (1, 2, -1, or -2)

   104  *   Line separator or ";" is used for the separator of each deviation data.</pre>

   105  *   Here is the example.

   106  * <pre>

   107  *     1429/0-1429/1:1

   108  *     1429/2-1429/7:1;1429/6-1429/11:1

   109  *     1429/11-9999/11:1</pre>

   110  * The default location of the configuration file is:

   111  * <pre>

   112  *   $CLASSPATH/java/time/i18n</pre>

   113  * And the default file name is:

   114  * <pre>

   115  *   hijrah_deviation.cfg</pre>

   116  * The default location and file name can be overriden by setting

   117  * following two Java's system property.

   118  * <pre>

   119  *   Location: java.time.i18n.HijrahDate.deviationConfigDir

   120  *   File name: java.time.i18n.HijrahDate.deviationConfigFile</pre>

   121  *

   122  * <h3>Specification for implementors</h3>

   123  * This class is immutable and thread-safe.

   124  *

   125  * @since 1.8

   126  */

   127 public final class HijrahDate

   128         extends ChronoDateImpl<HijrahDate>

   129         implements ChronoLocalDate<HijrahDate>, Serializable {

   130 

   131     /**

   132      * Serialization version.

   133      */

   134     private static final long serialVersionUID = -5207853542612002020L;

   135 

   136     /**

   137      * The Chronology of this HijrahDate.

   138      */

   139     private final HijrahChronology chrono;

   140     /**

   141      * The era.

   142      */

   143     private final transient HijrahEra era;

   144     /**

   145      * The year.

   146      */

   147     private final transient int yearOfEra;

   148     /**

   149      * The month-of-year.

   150      */

   151     private final transient int monthOfYear;

   152     /**

   153      * The day-of-month.

   154      */

   155     private final transient int dayOfMonth;

   156     /**

   157      * The day-of-year.

   158      */

   159     private final transient int dayOfYear;

   160     /**

   161      * The day-of-week.

   162      */

   163     private final transient DayOfWeek dayOfWeek;

   164     /**

   165      * Gregorian days for this object. Holding number of days since 1970/01/01.

   166      * The number of days are calculated with pure Gregorian calendar

   167      * based.

   168      */

   169     private final long gregorianEpochDay;

   170     /**

   171      * True if year is leap year.

   172      */

   173     private final transient boolean isLeapYear;

   174 

   175     //-------------------------------------------------------------------------

   176     /**

   177      * Obtains an instance of {@code HijrahDate} from the Hijrah era year,

   178      * month-of-year and day-of-month. This uses the Hijrah era.

   179      *

   180      * @param prolepticYear  the proleptic year to represent in the Hijrah

   181      * @param monthOfYear  the month-of-year to represent, from 1 to 12

   182      * @param dayOfMonth  the day-of-month to represent, from 1 to 30

   183      * @return the Hijrah date, never null

   184      * @throws DateTimeException if the value of any field is out of range

   185      */

   186     static HijrahDate of(HijrahChronology chrono, int prolepticYear, int monthOfYear, int dayOfMonth) {

   187         return (prolepticYear >= 1) ?

   188             HijrahDate.of(chrono, HijrahEra.AH, prolepticYear, monthOfYear, dayOfMonth) :

   189             HijrahDate.of(chrono, HijrahEra.BEFORE_AH, 1 - prolepticYear, monthOfYear, dayOfMonth);

   190     }

   191 

   192     /**

   193      * Obtains an instance of {@code HijrahDate} from the era, year-of-era

   194      * month-of-year and day-of-month.

   195      *

   196      * @param era  the era to represent, not null

   197      * @param yearOfEra  the year-of-era to represent, from 1 to 9999

   198      * @param monthOfYear  the month-of-year to represent, from 1 to 12

   199      * @param dayOfMonth  the day-of-month to represent, from 1 to 31

   200      * @return the Hijrah date, never null

   201      * @throws DateTimeException if the value of any field is out of range

   202      */

   203     private static HijrahDate of(HijrahChronology chrono, HijrahEra era, int yearOfEra, int monthOfYear, int dayOfMonth) {

   204         Objects.requireNonNull(era, "era");

   205         chrono.checkValidYearOfEra(yearOfEra);

   206         chrono.checkValidMonth(monthOfYear);

   207         chrono.checkValidDayOfMonth(dayOfMonth);

   208         long gregorianDays = chrono.getGregorianEpochDay(era.prolepticYear(yearOfEra), monthOfYear, dayOfMonth);

   209         return new HijrahDate(chrono, gregorianDays);

   210     }

   211 

   212     static HijrahDate ofEpochDay(HijrahChronology chrono, long epochDay) {

   213         return new HijrahDate(chrono, epochDay);

   214     }

   215 

   216     //-----------------------------------------------------------------------

   217     /**

   218      * Obtains the current {@code HijrahDate} from the system clock in the default time-zone.

   219      * <p>

   220      * This will query the {@link Clock#systemDefaultZone() system clock} in the default

   221      * time-zone to obtain the current date.

   222      * <p>

   223      * Using this method will prevent the ability to use an alternate clock for testing

   224      * because the clock is hard-coded.

   225      *

   226      * @return the current date using the system clock and default time-zone, not null

   227      */

   228     public static HijrahDate now() {

   229         return now(Clock.systemDefaultZone());

   230     }

   231 

   232     /**

   233      * Obtains the current {@code HijrahDate} from the system clock in the specified time-zone.

   234      * <p>

   235      * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date.

   236      * Specifying the time-zone avoids dependence on the default time-zone.

   237      * <p>

   238      * Using this method will prevent the ability to use an alternate clock for testing

   239      * because the clock is hard-coded.

   240      *

   241      * @param zone  the zone ID to use, not null

   242      * @return the current date using the system clock, not null

   243      */

   244     public static HijrahDate now(ZoneId zone) {

   245         return now(Clock.system(zone));

   246     }

   247 

   248     /**

   249      * Obtains the current {@code HijrahDate} from the specified clock.

   250      * <p>

   251      * This will query the specified clock to obtain the current date - today.

   252      * Using this method allows the use of an alternate clock for testing.

   253      * The alternate clock may be introduced using {@linkplain Clock dependency injection}.

   254      *

   255      * @param clock  the clock to use, not null

   256      * @return the current date, not null

   257      * @throws DateTimeException if the current date cannot be obtained

   258      */

   259     public static HijrahDate now(Clock clock) {

   260         return HijrahChronology.INSTANCE.date(LocalDate.now(clock));

   261     }

   262 

   263     /**

   264      * Obtains a {@code HijrahDate} representing a date in the Hijrah calendar

   265      * system from the proleptic-year, month-of-year and day-of-month fields.

   266      * <p>

   267      * This returns a {@code HijrahDate} with the specified fields.

   268      * The day must be valid for the year and month, otherwise an exception will be thrown.

   269      *

   270      * @param prolepticYear  the Hijrah proleptic-year

   271      * @param month  the Hijrah month-of-year, from 1 to 12

   272      * @param dayOfMonth  the Hijrah day-of-month, from 1 to 30

   273      * @return the date in Hijrah calendar system, not null

   274      * @throws DateTimeException if the value of any field is out of range,

   275      *  or if the day-of-month is invalid for the month-year

   276      */

   277     public static HijrahDate of(int prolepticYear, int month, int dayOfMonth) {

   278         return HijrahChronology.INSTANCE.date(prolepticYear, month, dayOfMonth);

   279     }

   280 

   281     /**

   282      * Obtains a {@code HijrahDate} from a temporal object.

   283      * <p>

   284      * This obtains a date in the Hijrah calendar system based on the specified temporal.

   285      * A {@code TemporalAccessor} represents an arbitrary set of date and time information,

   286      * which this factory converts to an instance of {@code HijrahDate}.

   287      * <p>

   288      * The conversion typically uses the {@link ChronoField#EPOCH_DAY EPOCH_DAY}

   289      * field, which is standardized across calendar systems.

   290      * <p>

   291      * This method matches the signature of the functional interface {@link TemporalQuery}

   292      * allowing it to be used as a query via method reference, {@code HijrahDate::from}.

   293      *

   294      * @param temporal  the temporal object to convert, not null

   295      * @return the date in Hijrah calendar system, not null

   296      * @throws DateTimeException if unable to convert to a {@code HijrahDate}

   297      */

   298     public static HijrahDate from(TemporalAccessor temporal) {

   299         return HijrahChronology.INSTANCE.date(temporal);

   300     }

   301 

   302     //-----------------------------------------------------------------------

   303     /**

   304      * Constructs an instance with the specified date.

   305      *

   306      * @param gregorianDay  the number of days from 0001/01/01 (Gregorian), caller calculated

   307      */

   308     private HijrahDate(HijrahChronology chrono, long gregorianDay) {

   309         this.chrono = chrono;

   310         int[] dateInfo = chrono.getHijrahDateInfo(gregorianDay);

   311 

   312         chrono.checkValidYearOfEra(dateInfo[1]);

   313         chrono.checkValidMonth(dateInfo[2]);

   314         chrono.checkValidDayOfMonth(dateInfo[3]);

   315         chrono.checkValidDayOfYear(dateInfo[4]);

   316 

   317         this.era = HijrahEra.of(dateInfo[0]);

   318         this.yearOfEra = dateInfo[1];

   319         this.monthOfYear = dateInfo[2];

   320         this.dayOfMonth = dateInfo[3];

   321         this.dayOfYear = dateInfo[4];

   322         this.dayOfWeek = DayOfWeek.of(dateInfo[5]);

   323         this.gregorianEpochDay = gregorianDay;

   324         this.isLeapYear = chrono.isLeapYear(this.yearOfEra);

   325     }

   326 

   327     //-----------------------------------------------------------------------

   328     @Override

   329     public HijrahChronology getChronology() {

   330         return chrono;

   331     }

   332 

   333     @Override

   334     public ValueRange range(TemporalField field) {

   335         if (field instanceof ChronoField) {

   336             if (isSupported(field)) {

   337                 ChronoField f = (ChronoField) field;

   338                 switch (f) {

   339                     case DAY_OF_MONTH: return ValueRange.of(1, lengthOfMonth());

   340                     case DAY_OF_YEAR: return ValueRange.of(1, lengthOfYear());

   341                     case ALIGNED_WEEK_OF_MONTH: return ValueRange.of(1, 5);  // TODO

   342                     case YEAR_OF_ERA: return ValueRange.of(1, 1000);  // TODO

   343                 }

   344                 return getChronology().range(f);

   345             }

   346             throw new DateTimeException("Unsupported field: " + field.getName());

   347         }

   348         return field.rangeRefinedBy(this);

   349     }

   350 

   351     @Override   // Override for javadoc

   352     public int get(TemporalField field) {

   353         return super.get(field);

   354     }

   355 

   356     @Override

   357     public long getLong(TemporalField field) {

   358         if (field instanceof ChronoField) {

   359             switch ((ChronoField) field) {

   360                 case DAY_OF_WEEK: return dayOfWeek.getValue();

   361                 case ALIGNED_DAY_OF_WEEK_IN_MONTH: return ((dayOfWeek.getValue() - 1) % 7) + 1;

   362                 case ALIGNED_DAY_OF_WEEK_IN_YEAR: return ((dayOfYear - 1) % 7) + 1;

   363                 case DAY_OF_MONTH: return this.dayOfMonth;

   364                 case DAY_OF_YEAR: return this.dayOfYear;

   365                 case EPOCH_DAY: return toEpochDay();

   366                 case ALIGNED_WEEK_OF_MONTH: return ((dayOfMonth - 1) / 7) + 1;

   367                 case ALIGNED_WEEK_OF_YEAR: return ((dayOfYear - 1) / 7) + 1;

   368                 case MONTH_OF_YEAR: return monthOfYear;

   369                 case YEAR_OF_ERA: return yearOfEra;

   370                 case YEAR: return yearOfEra;

   371                 case ERA: return era.getValue();

   372             }

   373             throw new DateTimeException("Unsupported field: " + field.getName());

   374         }

   375         return field.getFrom(this);

   376     }

   377 

   378     @Override

   379     public HijrahDate with(TemporalField field, long newValue) {

   380         if (field instanceof ChronoField) {

   381             ChronoField f = (ChronoField) field;

   382             f.checkValidValue(newValue);        // TODO: validate value

   383             int nvalue = (int) newValue;

   384             switch (f) {

   385                 case DAY_OF_WEEK: return plusDays(newValue - dayOfWeek.getValue());

   386                 case ALIGNED_DAY_OF_WEEK_IN_MONTH: return plusDays(newValue - getLong(ALIGNED_DAY_OF_WEEK_IN_MONTH));

   387                 case ALIGNED_DAY_OF_WEEK_IN_YEAR: return plusDays(newValue - getLong(ALIGNED_DAY_OF_WEEK_IN_YEAR));

   388                 case DAY_OF_MONTH: return resolvePreviousValid(yearOfEra, monthOfYear, nvalue);

   389                 case DAY_OF_YEAR: return resolvePreviousValid(yearOfEra, ((nvalue - 1) / 30) + 1, ((nvalue - 1) % 30) + 1);

   390                 case EPOCH_DAY: return new HijrahDate(chrono, nvalue);

   391                 case ALIGNED_WEEK_OF_MONTH: return plusDays((newValue - getLong(ALIGNED_WEEK_OF_MONTH)) * 7);

   392                 case ALIGNED_WEEK_OF_YEAR: return plusDays((newValue - getLong(ALIGNED_WEEK_OF_YEAR)) * 7);

   393                 case MONTH_OF_YEAR: return resolvePreviousValid(yearOfEra, nvalue, dayOfMonth);

   394                 case YEAR_OF_ERA: return resolvePreviousValid(yearOfEra >= 1 ? nvalue : 1 - nvalue, monthOfYear, dayOfMonth);

   395                 case YEAR: return resolvePreviousValid(nvalue, monthOfYear, dayOfMonth);

   396                 case ERA: return resolvePreviousValid(1 - yearOfEra, monthOfYear, dayOfMonth);

   397             }

   398             throw new DateTimeException("Unsupported field: " + field.getName());

   399         }

   400         return (HijrahDate) ChronoLocalDate.super.with(field, newValue);

   401     }

   402 

   403     private HijrahDate resolvePreviousValid(int yearOfEra, int month, int day) {

   404         int monthDays = getMonthDays(month - 1, yearOfEra);

   405         if (day > monthDays) {

   406             day = monthDays;

   407         }

   408         return HijrahDate.of(chrono, yearOfEra, month, day);

   409     }

   410 

   411     /**

   412      * {@inheritDoc}

   413      * @throws DateTimeException {@inheritDoc}

   414      * @throws ArithmeticException {@inheritDoc}

   415      */

   416     @Override

   417     public  HijrahDate with(TemporalAdjuster adjuster) {

   418         return (HijrahDate)super.with(adjuster);

   419     }

   420 

   421     /**

   422      * {@inheritDoc}

   423      * @throws DateTimeException {@inheritDoc}

   424      * @throws ArithmeticException {@inheritDoc}

   425      */

   426     @Override

   427     public HijrahDate plus(TemporalAmount amount) {

   428         return (HijrahDate)super.plus(amount);

   429     }

   430 

   431     /**

   432      * {@inheritDoc}

   433      * @throws DateTimeException {@inheritDoc}

   434      * @throws ArithmeticException {@inheritDoc}

   435      */

   436     @Override

   437     public HijrahDate minus(TemporalAmount amount) {

   438         return (HijrahDate)super.minus(amount);

   439     }

   440 

   441     @Override

   442     public long toEpochDay() {

   443          return chrono.getGregorianEpochDay(yearOfEra, monthOfYear, dayOfMonth);

   444     }

   445 

   446     //-----------------------------------------------------------------------

   447     /**

   448      * Checks if the year is a leap year, according to the Hijrah calendar system rules.

   449      *

   450      * @return true if this date is in a leap year

   451      */

   452     @Override

   453     public boolean isLeapYear() {

   454         return this.isLeapYear;

   455     }

   456 

   457     //-----------------------------------------------------------------------

   458     @Override

   459     HijrahDate plusYears(long years) {

   460         if (years == 0) {

   461             return this;

   462         }

   463         int newYear = Math.addExact(this.yearOfEra, (int)years);

   464         return HijrahDate.of(chrono, this.era, newYear, this.monthOfYear, this.dayOfMonth);

   465     }

   466 

   467     @Override

   468     HijrahDate plusMonths(long months) {

   469         if (months == 0) {

   470             return this;

   471         }

   472         int newMonth = this.monthOfYear - 1;

   473         newMonth = newMonth + (int)months;

   474         int years = newMonth / 12;

   475         newMonth = newMonth % 12;

   476         while (newMonth < 0) {

   477             newMonth += 12;

   478             years = Math.subtractExact(years, 1);

   479         }

   480         int newYear = Math.addExact(this.yearOfEra, years);

   481         return HijrahDate.of(chrono, this.era, newYear, newMonth + 1, this.dayOfMonth);

   482     }

   483 

   484     @Override

   485     HijrahDate plusWeeks(long weeksToAdd) {

   486         return (HijrahDate)super.plusWeeks(weeksToAdd);

   487     }

   488 

   489     @Override

   490     HijrahDate plusDays(long days) {

   491         return new HijrahDate(chrono, this.gregorianEpochDay + days);

   492     }

   493 

   494     @Override

   495     public HijrahDate plus(long amountToAdd, TemporalUnit unit) {

   496         return (HijrahDate)super.plus(amountToAdd, unit);

   497     }

   498 

   499     @Override

   500     public HijrahDate minus(long amountToSubtract, TemporalUnit unit) {

   501         return (HijrahDate)super.minus(amountToSubtract, unit);

   502     }

   503 

   504     @Override

   505     HijrahDate minusYears(long yearsToSubtract) {

   506         return (HijrahDate)super.minusYears(yearsToSubtract);

   507     }

   508 

   509     @Override

   510     HijrahDate minusMonths(long monthsToSubtract) {

   511         return (HijrahDate)super.minusMonths(monthsToSubtract);

   512     }

   513 

   514     @Override

   515     HijrahDate minusWeeks(long weeksToSubtract) {

   516         return (HijrahDate)super.minusWeeks(weeksToSubtract);

   517     }

   518 

   519     @Override

   520     HijrahDate minusDays(long daysToSubtract) {

   521         return (HijrahDate)super.minusDays(daysToSubtract);

   522     }

   523 

   524     /**

   525      * Returns month days from the beginning of year.

   526      *

   527      * @param month  month (0-based)

   528      * @parma year  year

   529      * @return month days from the beginning of year

   530      */

   531     private int getMonthDays(int month, int year) {

   532         int[] newMonths = chrono.getAdjustedMonthDays(year);

   533         return newMonths[month];

   534     }

   535 

   536     /**

   537      * Returns month length.

   538      *

   539      * @param month  month (0-based)

   540      * @param year  year

   541      * @return month length

   542      */

   543     private int getMonthLength(int month, int year) {

   544       int[] newMonths = chrono.getAdjustedMonthLength(year);

   545       return newMonths[month];

   546     }

   547 

   548     @Override

   549     public int lengthOfMonth() {

   550         return getMonthLength(monthOfYear - 1, yearOfEra);

   551     }

   552 

   553     @Override

   554     public int lengthOfYear() {

   555         return chrono.getYearLength(yearOfEra);  // TODO: proleptic year

   556     }

   557 

   558     @Override        // for javadoc and covariant return type

   559     public final ChronoLocalDateTime<HijrahDate> atTime(LocalTime localTime) {

   560         return (ChronoLocalDateTime<HijrahDate>)super.atTime(localTime);

   561     }

   562 

   563     @Override

   564     public Period periodUntil(ChronoLocalDate<?> endDate) {

   565         // TODO: untested

   566         HijrahDate end = (HijrahDate) getChronology().date(endDate);

   567         long totalMonths = (end.yearOfEra - this.yearOfEra) * 12 + (end.monthOfYear - this.monthOfYear);  // safe

   568         int days = end.dayOfMonth - this.dayOfMonth;

   569         if (totalMonths > 0 && days < 0) {

   570             totalMonths--;

   571             HijrahDate calcDate = this.plusMonths(totalMonths);

   572             days = (int) (end.toEpochDay() - calcDate.toEpochDay());  // safe

   573         } else if (totalMonths < 0 && days > 0) {

   574             totalMonths++;

   575             days -= end.lengthOfMonth();

   576         }

   577         long years = totalMonths / 12;  // safe

   578         int months = (int) (totalMonths % 12);  // safe

   579         return Period.of(Math.toIntExact(years), months, days);

   580     }

   581 

   582     //-----------------------------------------------------------------------

   583     private Object writeReplace() {

   584         return new Ser(Ser.HIJRAH_DATE_TYPE, this);

   585     }

   586 

   587     void writeExternal(ObjectOutput out) throws IOException {

   588         // HijrahChronology is implicit in the Hijrah_DATE_TYPE

   589         out.writeObject(chrono);

   590         out.writeInt(get(YEAR));

   591         out.writeByte(get(MONTH_OF_YEAR));

   592         out.writeByte(get(DAY_OF_MONTH));

   593     }

   594 

   595     /**

   596      * Replaces the date instance from the stream with a valid one.

   597      * ReadExternal has already read the fields and created a new instance

   598      * from the data.

   599      *

   600      * @return the resolved date, never null

   601      */

   602     private Object readResolve() {

   603         return this;

   604     }

   605 

   606     static ChronoLocalDate<HijrahDate> readExternal(ObjectInput in) throws IOException, ClassNotFoundException {

   607         HijrahChronology chrono = (HijrahChronology)in.readObject();

   608         int year = in.readInt();

   609         int month = in.readByte();

   610         int dayOfMonth = in.readByte();

   611         return chrono.date(year, month, dayOfMonth);

   612     }

   613 

   614 }