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  * This file is available under and governed by the GNU General Public

    28  * License version 2 only, as published by the Free Software Foundation.

    29  * However, the following notice accompanied the original version of this

    30  * file:

    31  *

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

    33  *

    34  * All rights reserved.

    35  *

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

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

    38  *

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

    40  *    this list of conditions and the following disclaimer.

    41  *

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

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

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

    45  *

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

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

    48  *    without specific prior written permission.

    49  *

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

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

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

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

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

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

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

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

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

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

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

    61  */

    62 package java.time.chrono;

    63 

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

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

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

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

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

    69 import static java.time.temporal.ChronoField.DAY_OF_WEEK;

    70 import static java.time.temporal.ChronoField.DAY_OF_YEAR;

    71 import static java.time.temporal.ChronoField.EPOCH_DAY;

    72 import static java.time.temporal.ChronoField.ERA;

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

    74 import static java.time.temporal.ChronoField.PROLEPTIC_MONTH;

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

    76 import static java.time.temporal.ChronoField.YEAR_OF_ERA;

    77 import static java.time.temporal.ChronoUnit.DAYS;

    78 import static java.time.temporal.ChronoUnit.MONTHS;

    79 import static java.time.temporal.ChronoUnit.WEEKS;

    80 import static java.time.temporal.TemporalAdjuster.nextOrSame;

    81 

    82 import java.io.DataInput;

    83 import java.io.DataOutput;

    84 import java.io.IOException;

    85 import java.io.InvalidObjectException;

    86 import java.io.ObjectStreamException;

    87 import java.io.Serializable;

    88 import java.time.DateTimeException;

    89 import java.time.DayOfWeek;

    90 import java.time.format.ResolverStyle;

    91 import java.time.temporal.ChronoField;

    92 import java.time.temporal.TemporalAdjuster;

    93 import java.time.temporal.TemporalField;

    94 import java.time.temporal.ValueRange;

    95 import java.util.Comparator;

    96 import java.util.HashSet;

    97 import java.util.List;

    98 import java.util.Locale;

    99 import java.util.Map;

   100 import java.util.Objects;

   101 import java.util.ServiceLoader;

   102 import java.util.Set;

   103 import java.util.concurrent.ConcurrentHashMap;

   104 

   105 import sun.util.logging.PlatformLogger;

   106 

   107 /**

   108  * An abstract implementation of a calendar system, used to organize and identify dates.

   109  * <p>

   110  * The main date and time API is built on the ISO calendar system.

   111  * The chronology operates behind the scenes to represent the general concept of a calendar system.

   112  * <p>

   113  * See {@link Chronology} for more details.

   114  *

   115  * @implSpec

   116  * This class is separated from the {@code Chronology} interface so that the static methods

   117  * are not inherited. While {@code Chronology} can be implemented directly, it is strongly

   118  * recommended to extend this abstract class instead.

   119  * <p>

   120  * This class must be implemented with care to ensure other classes operate correctly.

   121  * All implementations that can be instantiated must be final, immutable and thread-safe.

   122  * Subclasses should be Serializable wherever possible.

   123  *

   124  * @since 1.8

   125  */

   126 public abstract class AbstractChronology implements Chronology {

   127 

   128     /**

   129      * ChronoLocalDate order constant.

   130      */

   131     static final Comparator<ChronoLocalDate> DATE_ORDER =

   132         (Comparator<ChronoLocalDate> & Serializable) (date1, date2) -> {

   133             return Long.compare(date1.toEpochDay(), date2.toEpochDay());

   134         };

   135     /**

   136      * ChronoLocalDateTime order constant.

   137      */

   138     static final Comparator<ChronoLocalDateTime<? extends ChronoLocalDate>> DATE_TIME_ORDER =

   139         (Comparator<ChronoLocalDateTime<? extends ChronoLocalDate>> & Serializable) (dateTime1, dateTime2) -> {

   140             int cmp = Long.compare(dateTime1.toLocalDate().toEpochDay(), dateTime2.toLocalDate().toEpochDay());

   141             if (cmp == 0) {

   142                 cmp = Long.compare(dateTime1.toLocalTime().toNanoOfDay(), dateTime2.toLocalTime().toNanoOfDay());

   143             }

   144             return cmp;

   145         };

   146     /**

   147      * ChronoZonedDateTime order constant.

   148      */

   149     static final Comparator<ChronoZonedDateTime<?>> INSTANT_ORDER =

   150             (Comparator<ChronoZonedDateTime<?>> & Serializable) (dateTime1, dateTime2) -> {

   151                 int cmp = Long.compare(dateTime1.toEpochSecond(), dateTime2.toEpochSecond());

   152                 if (cmp == 0) {

   153                     cmp = Long.compare(dateTime1.toLocalTime().getNano(), dateTime2.toLocalTime().getNano());

   154                 }

   155                 return cmp;

   156             };

   157 

   158     /**

   159      * Map of available calendars by ID.

   160      */

   161     private static final ConcurrentHashMap<String, Chronology> CHRONOS_BY_ID = new ConcurrentHashMap<>();

   162     /**

   163      * Map of available calendars by calendar type.

   164      */

   165     private static final ConcurrentHashMap<String, Chronology> CHRONOS_BY_TYPE = new ConcurrentHashMap<>();

   166 

   167     /**

   168      * Register a Chronology by its ID and type for lookup by {@link #of(String)}.

   169      * Chronologies must not be registered until they are completely constructed.

   170      * Specifically, not in the constructor of Chronology.

   171      *

   172      * @param chrono the chronology to register; not null

   173      * @return the already registered Chronology if any, may be null

   174      */

   175     static Chronology registerChrono(Chronology chrono) {

   176         return registerChrono(chrono, chrono.getId());

   177     }

   178 

   179     /**

   180      * Register a Chronology by ID and type for lookup by {@link #of(String)}.

   181      * Chronos must not be registered until they are completely constructed.

   182      * Specifically, not in the constructor of Chronology.

   183      *

   184      * @param chrono the chronology to register; not null

   185      * @param id the ID to register the chronology; not null

   186      * @return the already registered Chronology if any, may be null

   187      */

   188     static Chronology registerChrono(Chronology chrono, String id) {

   189         Chronology prev = CHRONOS_BY_ID.putIfAbsent(id, chrono);

   190         if (prev == null) {

   191             String type = chrono.getCalendarType();

   192             if (type != null) {

   193                 CHRONOS_BY_TYPE.putIfAbsent(type, chrono);

   194             }

   195         }

   196         return prev;

   197     }

   198 

   199     /**

   200      * Initialization of the maps from id and type to Chronology.

   201      * The ServiceLoader is used to find and register any implementations

   202      * of {@link java.time.chrono.AbstractChronology} found in the bootclass loader.

   203      * The built-in chronologies are registered explicitly.

   204      * Calendars configured via the Thread's context classloader are local

   205      * to that thread and are ignored.

   206      * <p>

   207      * The initialization is done only once using the registration

   208      * of the IsoChronology as the test and the final step.

   209      * Multiple threads may perform the initialization concurrently.

   210      * Only the first registration of each Chronology is retained by the

   211      * ConcurrentHashMap.

   212      * @return true if the cache was initialized

   213      */

   214     private static boolean initCache() {

   215         if (CHRONOS_BY_ID.get("ISO") == null) {

   216             // Initialization is incomplete

   217 

   218             // Register built-in Chronologies

   219             registerChrono(HijrahChronology.INSTANCE);

   220             registerChrono(JapaneseChronology.INSTANCE);

   221             registerChrono(MinguoChronology.INSTANCE);

   222             registerChrono(ThaiBuddhistChronology.INSTANCE);

   223 

   224             // Register Chronologies from the ServiceLoader

   225             @SuppressWarnings("rawtypes")

   226             ServiceLoader<AbstractChronology> loader =  ServiceLoader.load(AbstractChronology.class, null);

   227             for (AbstractChronology chrono : loader) {

   228                 String id = chrono.getId();

   229                 if (id.equals("ISO") || registerChrono(chrono) != null) {

   230                     // Log the attempt to replace an existing Chronology

   231                     PlatformLogger logger = PlatformLogger.getLogger("java.time.chrono");

   232                     logger.warning("Ignoring duplicate Chronology, from ServiceLoader configuration "  + id);

   233                 }

   234             }

   235 

   236             // finally, register IsoChronology to mark initialization is complete

   237             registerChrono(IsoChronology.INSTANCE);

   238             return true;

   239         }

   240         return false;

   241     }

   242 

   243     //-----------------------------------------------------------------------

   244     /**

   245      * Obtains an instance of {@code Chronology} from a locale.

   246      * <p>

   247      * See {@link Chronology#ofLocale(Locale)}.

   248      *

   249      * @param locale  the locale to use to obtain the calendar system, not null

   250      * @return the calendar system associated with the locale, not null

   251      * @throws java.time.DateTimeException if the locale-specified calendar cannot be found

   252      */

   253     static Chronology ofLocale(Locale locale) {

   254         Objects.requireNonNull(locale, "locale");

   255         String type = locale.getUnicodeLocaleType("ca");

   256         if (type == null || "iso".equals(type) || "iso8601".equals(type)) {

   257             return IsoChronology.INSTANCE;

   258         }

   259         // Not pre-defined; lookup by the type

   260         do {

   261             Chronology chrono = CHRONOS_BY_TYPE.get(type);

   262             if (chrono != null) {

   263                 return chrono;

   264             }

   265             // If not found, do the initialization (once) and repeat the lookup

   266         } while (initCache());

   267 

   268         // Look for a Chronology using ServiceLoader of the Thread's ContextClassLoader

   269         // Application provided Chronologies must not be cached

   270         @SuppressWarnings("rawtypes")

   271         ServiceLoader<Chronology> loader = ServiceLoader.load(Chronology.class);

   272         for (Chronology chrono : loader) {

   273             if (type.equals(chrono.getCalendarType())) {

   274                 return chrono;

   275             }

   276         }

   277         throw new DateTimeException("Unknown calendar system: " + type);

   278     }

   279 

   280     //-----------------------------------------------------------------------

   281     /**

   282      * Obtains an instance of {@code Chronology} from a chronology ID or

   283      * calendar system type.

   284      * <p>

   285      * See {@link Chronology#of(String)}.

   286      *

   287      * @param id  the chronology ID or calendar system type, not null

   288      * @return the chronology with the identifier requested, not null

   289      * @throws java.time.DateTimeException if the chronology cannot be found

   290      */

   291     static Chronology of(String id) {

   292         Objects.requireNonNull(id, "id");

   293         do {

   294             Chronology chrono = of0(id);

   295             if (chrono != null) {

   296                 return chrono;

   297             }

   298             // If not found, do the initialization (once) and repeat the lookup

   299         } while (initCache());

   300 

   301         // Look for a Chronology using ServiceLoader of the Thread's ContextClassLoader

   302         // Application provided Chronologies must not be cached

   303         @SuppressWarnings("rawtypes")

   304         ServiceLoader<Chronology> loader = ServiceLoader.load(Chronology.class);

   305         for (Chronology chrono : loader) {

   306             if (id.equals(chrono.getId()) || id.equals(chrono.getCalendarType())) {

   307                 return chrono;

   308             }

   309         }

   310         throw new DateTimeException("Unknown chronology: " + id);

   311     }

   312 

   313     /**

   314      * Obtains an instance of {@code Chronology} from a chronology ID or

   315      * calendar system type.

   316      *

   317      * @param id  the chronology ID or calendar system type, not null

   318      * @return the chronology with the identifier requested, or {@code null} if not found

   319      */

   320     private static Chronology of0(String id) {

   321         Chronology chrono = CHRONOS_BY_ID.get(id);

   322         if (chrono == null) {

   323             chrono = CHRONOS_BY_TYPE.get(id);

   324         }

   325         return chrono;

   326     }

   327 

   328     /**

   329      * Returns the available chronologies.

   330      * <p>

   331      * Each returned {@code Chronology} is available for use in the system.

   332      * The set of chronologies includes the system chronologies and

   333      * any chronologies provided by the application via ServiceLoader

   334      * configuration.

   335      *

   336      * @return the independent, modifiable set of the available chronology IDs, not null

   337      */

   338     static Set<Chronology> getAvailableChronologies() {

   339         initCache();       // force initialization

   340         HashSet<Chronology> chronos = new HashSet<>(CHRONOS_BY_ID.values());

   341 

   342         /// Add in Chronologies from the ServiceLoader configuration

   343         @SuppressWarnings("rawtypes")

   344         ServiceLoader<Chronology> loader = ServiceLoader.load(Chronology.class);

   345         for (Chronology chrono : loader) {

   346             chronos.add(chrono);

   347         }

   348         return chronos;

   349     }

   350 

   351     //-----------------------------------------------------------------------

   352     /**

   353      * Creates an instance.

   354      */

   355     protected AbstractChronology() {

   356     }

   357 

   358     //-----------------------------------------------------------------------

   359     /**

   360      * Resolves parsed {@code ChronoField} values into a date during parsing.

   361      * <p>

   362      * Most {@code TemporalField} implementations are resolved using the

   363      * resolve method on the field. By contrast, the {@code ChronoField} class

   364      * defines fields that only have meaning relative to the chronology.

   365      * As such, {@code ChronoField} date fields are resolved here in the

   366      * context of a specific chronology.

   367      * <p>

   368      * {@code ChronoField} instances are resolved by this method, which may

   369      * be overridden in subclasses.

   370      * <ul>

   371      * <li>{@code EPOCH_DAY} - If present, this is converted to a date and

   372      *  all other date fields are then cross-checked against the date.

   373      * <li>{@code PROLEPTIC_MONTH} - If present, then it is split into the

   374      *  {@code YEAR} and {@code MONTH_OF_YEAR}. If the mode is strict or smart

   375      *  then the field is validated.

   376      * <li>{@code YEAR_OF_ERA} and {@code ERA} - If both are present, then they

   377      *  are combined to form a {@code YEAR}. In lenient mode, the {@code YEAR_OF_ERA}

   378      *  range is not validated, in smart and strict mode it is. The {@code ERA} is

   379      *  validated for range in all three modes. If only the {@code YEAR_OF_ERA} is

   380      *  present, and the mode is smart or lenient, then the last available era

   381      *  is assumed. In strict mode, no era is assumed and the {@code YEAR_OF_ERA} is

   382      *  left untouched. If only the {@code ERA} is present, then it is left untouched.

   383      * <li>{@code YEAR}, {@code MONTH_OF_YEAR} and {@code DAY_OF_MONTH} -

   384      *  If all three are present, then they are combined to form a date.

   385      *  In all three modes, the {@code YEAR} is validated.

   386      *  If the mode is smart or strict, then the month and day are validated.

   387      *  If the mode is lenient, then the date is combined in a manner equivalent to

   388      *  creating a date on the first day of the first month in the requested year,

   389      *  then adding the difference in months, then the difference in days.

   390      *  If the mode is smart, and the day-of-month is greater than the maximum for

   391      *  the year-month, then the day-of-month is adjusted to the last day-of-month.

   392      *  If the mode is strict, then the three fields must form a valid date.

   393      * <li>{@code YEAR} and {@code DAY_OF_YEAR} -

   394      *  If both are present, then they are combined to form a date.

   395      *  In all three modes, the {@code YEAR} is validated.

   396      *  If the mode is lenient, then the date is combined in a manner equivalent to

   397      *  creating a date on the first day of the requested year, then adding

   398      *  the difference in days.

   399      *  If the mode is smart or strict, then the two fields must form a valid date.

   400      * <li>{@code YEAR}, {@code MONTH_OF_YEAR}, {@code ALIGNED_WEEK_OF_MONTH} and

   401      *  {@code ALIGNED_DAY_OF_WEEK_IN_MONTH} -

   402      *  If all four are present, then they are combined to form a date.

   403      *  In all three modes, the {@code YEAR} is validated.

   404      *  If the mode is lenient, then the date is combined in a manner equivalent to

   405      *  creating a date on the first day of the first month in the requested year, then adding

   406      *  the difference in months, then the difference in weeks, then in days.

   407      *  If the mode is smart or strict, then the all four fields are validated to

   408      *  their outer ranges. The date is then combined in a manner equivalent to

   409      *  creating a date on the first day of the requested year and month, then adding

   410      *  the amount in weeks and days to reach their values. If the mode is strict,

   411      *  the date is additionally validated to check that the day and week adjustment

   412      *  did not change the month.

   413      * <li>{@code YEAR}, {@code MONTH_OF_YEAR}, {@code ALIGNED_WEEK_OF_MONTH} and

   414      *  {@code DAY_OF_WEEK} - If all four are present, then they are combined to

   415      *  form a date. The approach is the same as described above for

   416      *  years, months and weeks in {@code ALIGNED_DAY_OF_WEEK_IN_MONTH}.

   417      *  The day-of-week is adjusted as the next or same matching day-of-week once

   418      *  the years, months and weeks have been handled.

   419      * <li>{@code YEAR}, {@code ALIGNED_WEEK_OF_YEAR} and {@code ALIGNED_DAY_OF_WEEK_IN_YEAR} -

   420      *  If all three are present, then they are combined to form a date.

   421      *  In all three modes, the {@code YEAR} is validated.

   422      *  If the mode is lenient, then the date is combined in a manner equivalent to

   423      *  creating a date on the first day of the requested year, then adding

   424      *  the difference in weeks, then in days.

   425      *  If the mode is smart or strict, then the all three fields are validated to

   426      *  their outer ranges. The date is then combined in a manner equivalent to

   427      *  creating a date on the first day of the requested year, then adding

   428      *  the amount in weeks and days to reach their values. If the mode is strict,

   429      *  the date is additionally validated to check that the day and week adjustment

   430      *  did not change the year.

   431      * <li>{@code YEAR}, {@code ALIGNED_WEEK_OF_YEAR} and {@code DAY_OF_WEEK} -

   432      *  If all three are present, then they are combined to form a date.

   433      *  The approach is the same as described above for years and weeks in

   434      *  {@code ALIGNED_DAY_OF_WEEK_IN_YEAR}. The day-of-week is adjusted as the

   435      *  next or same matching day-of-week once the years and weeks have been handled.

   436      * </ul>

   437      * <p>

   438      * The default implementation is suitable for most calendar systems.

   439      * If {@link java.time.temporal.ChronoField#YEAR_OF_ERA} is found without an {@link java.time.temporal.ChronoField#ERA}

   440      * then the last era in {@link #eras()} is used.

   441      * The implementation assumes a 7 day week, that the first day-of-month

   442      * has the value 1, that first day-of-year has the value 1, and that the

   443      * first of the month and year always exists.

   444      *

   445      * @param fieldValues  the map of fields to values, which can be updated, not null

   446      * @param resolverStyle  the requested type of resolve, not null

   447      * @return the resolved date, null if insufficient information to create a date

   448      * @throws java.time.DateTimeException if the date cannot be resolved, typically

   449      *  because of a conflict in the input data

   450      */

   451     @Override

   452     public ChronoLocalDate resolveDate(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {

   453         // check epoch-day before inventing era

   454         if (fieldValues.containsKey(EPOCH_DAY)) {

   455             return dateEpochDay(fieldValues.remove(EPOCH_DAY));

   456         }

   457 

   458         // fix proleptic month before inventing era

   459         resolveProlepticMonth(fieldValues, resolverStyle);

   460 

   461         // invent era if necessary to resolve year-of-era

   462         ChronoLocalDate resolved = resolveYearOfEra(fieldValues, resolverStyle);

   463         if (resolved != null) {

   464             return resolved;

   465         }

   466 

   467         // build date

   468         if (fieldValues.containsKey(YEAR)) {

   469             if (fieldValues.containsKey(MONTH_OF_YEAR)) {

   470                 if (fieldValues.containsKey(DAY_OF_MONTH)) {

   471                     return resolveYMD(fieldValues, resolverStyle);

   472                 }

   473                 if (fieldValues.containsKey(ALIGNED_WEEK_OF_MONTH)) {

   474                     if (fieldValues.containsKey(ALIGNED_DAY_OF_WEEK_IN_MONTH)) {

   475                         return resolveYMAA(fieldValues, resolverStyle);

   476                     }

   477                     if (fieldValues.containsKey(DAY_OF_WEEK)) {

   478                         return resolveYMAD(fieldValues, resolverStyle);

   479                     }

   480                 }

   481             }

   482             if (fieldValues.containsKey(DAY_OF_YEAR)) {

   483                 return resolveYD(fieldValues, resolverStyle);

   484             }

   485             if (fieldValues.containsKey(ALIGNED_WEEK_OF_YEAR)) {

   486                 if (fieldValues.containsKey(ALIGNED_DAY_OF_WEEK_IN_YEAR)) {

   487                     return resolveYAA(fieldValues, resolverStyle);

   488                 }

   489                 if (fieldValues.containsKey(DAY_OF_WEEK)) {

   490                     return resolveYAD(fieldValues, resolverStyle);

   491                 }

   492             }

   493         }

   494         return null;

   495     }

   496 

   497     void resolveProlepticMonth(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {

   498         Long pMonth = fieldValues.remove(PROLEPTIC_MONTH);

   499         if (pMonth != null) {

   500             if (resolverStyle != ResolverStyle.LENIENT) {

   501                 PROLEPTIC_MONTH.checkValidValue(pMonth);

   502             }

   503             // first day-of-month is likely to be safest for setting proleptic-month

   504             // cannot add to year zero, as not all chronologies have a year zero

   505             ChronoLocalDate chronoDate = dateNow()

   506                     .with(DAY_OF_MONTH, 1).with(PROLEPTIC_MONTH, pMonth);

   507             addFieldValue(fieldValues, MONTH_OF_YEAR, chronoDate.get(MONTH_OF_YEAR));

   508             addFieldValue(fieldValues, YEAR, chronoDate.get(YEAR));

   509         }

   510     }

   511 

   512     ChronoLocalDate resolveYearOfEra(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {

   513         Long yoeLong = fieldValues.remove(YEAR_OF_ERA);

   514         if (yoeLong != null) {

   515             Long eraLong = fieldValues.remove(ERA);

   516             int yoe;

   517             if (resolverStyle != ResolverStyle.LENIENT) {

   518                 yoe = range(YEAR_OF_ERA).checkValidIntValue(yoeLong, YEAR_OF_ERA);

   519             } else {

   520                 yoe = Math.toIntExact(yoeLong);

   521             }

   522             if (eraLong != null) {

   523                 Era eraObj = eraOf(range(ERA).checkValidIntValue(eraLong, ERA));

   524                 addFieldValue(fieldValues, YEAR, prolepticYear(eraObj, yoe));

   525             } else {

   526                 if (fieldValues.containsKey(YEAR)) {

   527                     int year = range(YEAR).checkValidIntValue(fieldValues.get(YEAR), YEAR);

   528                     ChronoLocalDate chronoDate = dateYearDay(year, 1);

   529                     addFieldValue(fieldValues, YEAR, prolepticYear(chronoDate.getEra(), yoe));

   530                 } else if (resolverStyle == ResolverStyle.STRICT) {

   531                     // do not invent era if strict

   532                     // reinstate the field removed earlier, no cross-check issues

   533                     fieldValues.put(YEAR_OF_ERA, yoeLong);

   534                 } else {

   535                     List<Era> eras = eras();

   536                     if (eras.isEmpty()) {

   537                         addFieldValue(fieldValues, YEAR, yoe);

   538                     } else {

   539                         Era eraObj = eras.get(eras.size() - 1);

   540                         addFieldValue(fieldValues, YEAR, prolepticYear(eraObj, yoe));

   541                     }

   542                 }

   543             }

   544         } else if (fieldValues.containsKey(ERA)) {

   545             range(ERA).checkValidValue(fieldValues.get(ERA), ERA);  // always validated

   546         }

   547         return null;

   548     }

   549 

   550     ChronoLocalDate resolveYMD(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {

   551         int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR);

   552         if (resolverStyle == ResolverStyle.LENIENT) {

   553             long months = Math.subtractExact(fieldValues.remove(MONTH_OF_YEAR), 1);

   554             long days = Math.subtractExact(fieldValues.remove(DAY_OF_MONTH), 1);

   555             return date(y, 1, 1).plus(months, MONTHS).plus(days, DAYS);

   556         }

   557         int moy = range(MONTH_OF_YEAR).checkValidIntValue(fieldValues.remove(MONTH_OF_YEAR), MONTH_OF_YEAR);

   558         ValueRange domRange = range(DAY_OF_MONTH);

   559         int dom = domRange.checkValidIntValue(fieldValues.remove(DAY_OF_MONTH), DAY_OF_MONTH);

   560         if (resolverStyle == ResolverStyle.SMART) {  // previous valid

   561             try {

   562                 return date(y, moy, dom);

   563             } catch (DateTimeException ex) {

   564                 return date(y, moy, 1).with(TemporalAdjuster.lastDayOfMonth());

   565             }

   566         }

   567         return date(y, moy, dom);

   568     }

   569 

   570     ChronoLocalDate resolveYD(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {

   571         int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR);

   572         if (resolverStyle == ResolverStyle.LENIENT) {

   573             long days = Math.subtractExact(fieldValues.remove(DAY_OF_YEAR), 1);

   574             return dateYearDay(y, 1).plus(days, DAYS);

   575         }

   576         int doy = range(DAY_OF_YEAR).checkValidIntValue(fieldValues.remove(DAY_OF_YEAR), DAY_OF_YEAR);

   577         return dateYearDay(y, doy);  // smart is same as strict

   578     }

   579 

   580     ChronoLocalDate resolveYMAA(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {

   581         int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR);

   582         if (resolverStyle == ResolverStyle.LENIENT) {

   583             long months = Math.subtractExact(fieldValues.remove(MONTH_OF_YEAR), 1);

   584             long weeks = Math.subtractExact(fieldValues.remove(ALIGNED_WEEK_OF_MONTH), 1);

   585             long days = Math.subtractExact(fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_MONTH), 1);

   586             return date(y, 1, 1).plus(months, MONTHS).plus(weeks, WEEKS).plus(days, DAYS);

   587         }

   588         int moy = range(MONTH_OF_YEAR).checkValidIntValue(fieldValues.remove(MONTH_OF_YEAR), MONTH_OF_YEAR);

   589         int aw = range(ALIGNED_WEEK_OF_MONTH).checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_MONTH), ALIGNED_WEEK_OF_MONTH);

   590         int ad = range(ALIGNED_DAY_OF_WEEK_IN_MONTH).checkValidIntValue(fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_MONTH), ALIGNED_DAY_OF_WEEK_IN_MONTH);

   591         ChronoLocalDate date = date(y, moy, 1).plus((aw - 1) * 7 + (ad - 1), DAYS);

   592         if (resolverStyle == ResolverStyle.STRICT && date.get(MONTH_OF_YEAR) != moy) {

   593             throw new DateTimeException("Strict mode rejected resolved date as it is in a different month");

   594         }

   595         return date;

   596     }

   597 

   598     ChronoLocalDate resolveYMAD(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {

   599         int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR);

   600         if (resolverStyle == ResolverStyle.LENIENT) {

   601             long months = Math.subtractExact(fieldValues.remove(MONTH_OF_YEAR), 1);

   602             long weeks = Math.subtractExact(fieldValues.remove(ALIGNED_WEEK_OF_MONTH), 1);

   603             long dow = Math.subtractExact(fieldValues.remove(DAY_OF_WEEK), 1);

   604             return resolveAligned(date(y, 1, 1), months, weeks, dow);

   605         }

   606         int moy = range(MONTH_OF_YEAR).checkValidIntValue(fieldValues.remove(MONTH_OF_YEAR), MONTH_OF_YEAR);

   607         int aw = range(ALIGNED_WEEK_OF_MONTH).checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_MONTH), ALIGNED_WEEK_OF_MONTH);

   608         int dow = range(DAY_OF_WEEK).checkValidIntValue(fieldValues.remove(DAY_OF_WEEK), DAY_OF_WEEK);

   609         ChronoLocalDate date = date(y, moy, 1).plus((aw - 1) * 7, DAYS).with(nextOrSame(DayOfWeek.of(dow)));

   610         if (resolverStyle == ResolverStyle.STRICT && date.get(MONTH_OF_YEAR) != moy) {

   611             throw new DateTimeException("Strict mode rejected resolved date as it is in a different month");

   612         }

   613         return date;

   614     }

   615 

   616     ChronoLocalDate resolveYAA(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {

   617         int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR);

   618         if (resolverStyle == ResolverStyle.LENIENT) {

   619             long weeks = Math.subtractExact(fieldValues.remove(ALIGNED_WEEK_OF_YEAR), 1);

   620             long days = Math.subtractExact(fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_YEAR), 1);

   621             return dateYearDay(y, 1).plus(weeks, WEEKS).plus(days, DAYS);

   622         }

   623         int aw = range(ALIGNED_WEEK_OF_YEAR).checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_YEAR), ALIGNED_WEEK_OF_YEAR);

   624         int ad = range(ALIGNED_DAY_OF_WEEK_IN_YEAR).checkValidIntValue(fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_YEAR), ALIGNED_DAY_OF_WEEK_IN_YEAR);

   625         ChronoLocalDate date = dateYearDay(y, 1).plus((aw - 1) * 7 + (ad - 1), DAYS);

   626         if (resolverStyle == ResolverStyle.STRICT && date.get(YEAR) != y) {

   627             throw new DateTimeException("Strict mode rejected resolved date as it is in a different year");

   628         }

   629         return date;

   630     }

   631 

   632     ChronoLocalDate resolveYAD(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {

   633         int y = range(YEAR).checkValidIntValue(fieldValues.remove(YEAR), YEAR);

   634         if (resolverStyle == ResolverStyle.LENIENT) {

   635             long weeks = Math.subtractExact(fieldValues.remove(ALIGNED_WEEK_OF_YEAR), 1);

   636             long dow = Math.subtractExact(fieldValues.remove(DAY_OF_WEEK), 1);

   637             return resolveAligned(dateYearDay(y, 1), 0, weeks, dow);

   638         }

   639         int aw = range(ALIGNED_WEEK_OF_YEAR).checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_YEAR), ALIGNED_WEEK_OF_YEAR);

   640         int dow = range(DAY_OF_WEEK).checkValidIntValue(fieldValues.remove(DAY_OF_WEEK), DAY_OF_WEEK);

   641         ChronoLocalDate date = dateYearDay(y, 1).plus((aw - 1) * 7, DAYS).with(nextOrSame(DayOfWeek.of(dow)));

   642         if (resolverStyle == ResolverStyle.STRICT && date.get(YEAR) != y) {

   643             throw new DateTimeException("Strict mode rejected resolved date as it is in a different year");

   644         }

   645         return date;

   646     }

   647 

   648     ChronoLocalDate resolveAligned(ChronoLocalDate base, long months, long weeks, long dow) {

   649         ChronoLocalDate date = base.plus(months, MONTHS).plus(weeks, WEEKS);

   650         if (dow > 7) {

   651             date = date.plus((dow - 1) / 7, WEEKS);

   652             dow = ((dow - 1) % 7) + 1;

   653         } else if (dow < 1) {

   654             date = date.plus(Math.subtractExact(dow,  7) / 7, WEEKS);

   655             dow = ((dow + 6) % 7) + 1;

   656         }

   657         return date.with(nextOrSame(DayOfWeek.of((int) dow)));

   658     }

   659 

   660     /**

   661      * Adds a field-value pair to the map, checking for conflicts.

   662      * <p>

   663      * If the field is not already present, then the field-value pair is added to the map.

   664      * If the field is already present and it has the same value as that specified, no action occurs.

   665      * If the field is already present and it has a different value to that specified, then

   666      * an exception is thrown.

   667      *

   668      * @param field  the field to add, not null

   669      * @param value  the value to add, not null

   670      * @throws java.time.DateTimeException if the field is already present with a different value

   671      */

   672     void addFieldValue(Map<TemporalField, Long> fieldValues, ChronoField field, long value) {

   673         Long old = fieldValues.get(field);  // check first for better error message

   674         if (old != null && old.longValue() != value) {

   675             throw new DateTimeException("Conflict found: " + field + " " + old + " differs from " + field + " " + value);

   676         }

   677         fieldValues.put(field, value);

   678     }

   679 

   680     //-----------------------------------------------------------------------

   681     /**

   682      * Compares this chronology to another chronology.

   683      * <p>

   684      * The comparison order first by the chronology ID string, then by any

   685      * additional information specific to the subclass.

   686      * It is "consistent with equals", as defined by {@link Comparable}.

   687      *

   688      * @implSpec

   689      * This implementation compares the chronology ID.

   690      * Subclasses must compare any additional state that they store.

   691      *

   692      * @param other  the other chronology to compare to, not null

   693      * @return the comparator value, negative if less, positive if greater

   694      */

   695     @Override

   696     public int compareTo(Chronology other) {

   697         return getId().compareTo(other.getId());

   698     }

   699 

   700     /**

   701      * Checks if this chronology is equal to another chronology.

   702      * <p>

   703      * The comparison is based on the entire state of the object.

   704      *

   705      * @implSpec

   706      * This implementation checks the type and calls

   707      * {@link #compareTo(java.time.chrono.Chronology)}.

   708      *

   709      * @param obj  the object to check, null returns false

   710      * @return true if this is equal to the other chronology

   711      */

   712     @Override

   713     public boolean equals(Object obj) {

   714         if (this == obj) {

   715            return true;

   716         }

   717         if (obj instanceof AbstractChronology) {

   718             return compareTo((AbstractChronology) obj) == 0;

   719         }

   720         return false;

   721     }

   722 

   723     /**

   724      * A hash code for this chronology.

   725      * <p>

   726      * The hash code should be based on the entire state of the object.

   727      *

   728      * @implSpec

   729      * This implementation is based on the chronology ID and class.

   730      * Subclasses should add any additional state that they store.

   731      *

   732      * @return a suitable hash code

   733      */

   734     @Override

   735     public int hashCode() {

   736         return getClass().hashCode() ^ getId().hashCode();

   737     }

   738 

   739     //-----------------------------------------------------------------------

   740     /**

   741      * Outputs this chronology as a {@code String}, using the chronology ID.

   742      *

   743      * @return a string representation of this chronology, not null

   744      */

   745     @Override

   746     public String toString() {

   747         return getId();

   748     }

   749 

   750     //-----------------------------------------------------------------------

   751     /**

   752      * Writes the Chronology using a

   753      * <a href="../../../serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>.

   754      * <pre>

   755      *  out.writeByte(1);  // identifies this as a Chronology

   756      *  out.writeUTF(getId());

   757      * </pre>

   758      *

   759      * @return the instance of {@code Ser}, not null

   760      */

   761     Object writeReplace() {

   762         return new Ser(Ser.CHRONO_TYPE, this);

   763     }

   764 

   765     /**

   766      * Defend against malicious streams.

   767      * @return never

   768      * @throws java.io.InvalidObjectException always

   769      */

   770     private Object readResolve() throws ObjectStreamException {

   771         throw new InvalidObjectException("Deserialization via serialization delegate");

   772     }

   773 

   774     void writeExternal(DataOutput out) throws IOException {

   775         out.writeUTF(getId());

   776     }

   777 

   778     static Chronology readExternal(DataInput in) throws IOException {

   779         String id = in.readUTF();

   780         return Chronology.of(id);

   781     }

   782 

   783 }