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.

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    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.YEAR;

    60 

    61 import java.io.Serializable;

    62 import java.time.Clock;

    63 import java.time.DateTimeException;

    64 import java.time.Instant;

    65 import java.time.LocalDate;

    66 import java.time.ZoneId;

    67 import java.time.temporal.ChronoField;

    68 import java.time.temporal.TemporalAccessor;

    69 import java.time.temporal.ValueRange;

    70 import java.util.Arrays;

    71 import java.util.HashMap;

    72 import java.util.List;

    73 import java.util.Locale;

    74 

    75 /**

    76  * The Thai Buddhist calendar system.

    77  * <p>

    78  * This chronology defines the rules of the Thai Buddhist calendar system.

    79  * This calendar system is primarily used in Thailand.

    80  * Dates are aligned such that {@code 2484-01-01 (Buddhist)} is {@code 1941-01-01 (ISO)}.

    81  * <p>

    82  * The fields are defined as follows:

    83  * <p><ul>

    84  * <li>era - There are two eras, the current 'Buddhist' (ERA_BE) and the previous era (ERA_BEFORE_BE).

    85  * <li>year-of-era - The year-of-era for the current era increases uniformly from the epoch at year one.

    86  *  For the previous era the year increases from one as time goes backwards.

    87  *  The value for the current era is equal to the ISO proleptic-year plus 543.

    88  * <li>proleptic-year - The proleptic year is the same as the year-of-era for the

    89  *  current era. For the previous era, years have zero, then negative values.

    90  *  The value is equal to the ISO proleptic-year plus 543.

    91  * <li>month-of-year - The ThaiBuddhist month-of-year exactly matches ISO.

    92  * <li>day-of-month - The ThaiBuddhist day-of-month exactly matches ISO.

    93  * <li>day-of-year - The ThaiBuddhist day-of-year exactly matches ISO.

    94  * <li>leap-year - The ThaiBuddhist leap-year pattern exactly matches ISO, such that the two calendars

    95  *  are never out of step.

    96  * </ul><p>

    97  *

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

    99  * This class is immutable and thread-safe.

   100  *

   101  * @since 1.8

   102  */

   103 public final class ThaiBuddhistChronology extends Chronology implements Serializable {

   104 

   105     /**

   106      * Singleton instance of the Buddhist chronology.

   107      */

   108     public static final ThaiBuddhistChronology INSTANCE = new ThaiBuddhistChronology();

   109     /**

   110      * The singleton instance for the era before the current one - Before Buddhist -

   111      * which has the value 0.

   112      */

   113     public static final Era ERA_BEFORE_BE = ThaiBuddhistEra.BEFORE_BE;

   114     /**

   115      * The singleton instance for the current era - Buddhist - which has the value 1.

   116      */

   117     public static final Era ERA_BE = ThaiBuddhistEra.BE;

   118 

   119     /**

   120      * Serialization version.

   121      */

   122     private static final long serialVersionUID = 2775954514031616474L;

   123     /**

   124      * Containing the offset to add to the ISO year.

   125      */

   126     static final int YEARS_DIFFERENCE = 543;

   127     /**

   128      * Narrow names for eras.

   129      */

   130     private static final HashMap<String, String[]> ERA_NARROW_NAMES = new HashMap<>();

   131     /**

   132      * Short names for eras.

   133      */

   134     private static final HashMap<String, String[]> ERA_SHORT_NAMES = new HashMap<>();

   135     /**

   136      * Full names for eras.

   137      */

   138     private static final HashMap<String, String[]> ERA_FULL_NAMES = new HashMap<>();

   139     /**

   140      * Fallback language for the era names.

   141      */

   142     private static final String FALLBACK_LANGUAGE = "en";

   143     /**

   144      * Language that has the era names.

   145      */

   146     private static final String TARGET_LANGUAGE = "th";

   147     /**

   148      * Name data.

   149      */

   150     static {

   151         ERA_NARROW_NAMES.put(FALLBACK_LANGUAGE, new String[]{"BB", "BE"});

   152         ERA_NARROW_NAMES.put(TARGET_LANGUAGE, new String[]{"BB", "BE"});

   153         ERA_SHORT_NAMES.put(FALLBACK_LANGUAGE, new String[]{"B.B.", "B.E."});

   154         ERA_SHORT_NAMES.put(TARGET_LANGUAGE,

   155                 new String[]{"\u0e1e.\u0e28.",

   156                 "\u0e1b\u0e35\u0e01\u0e48\u0e2d\u0e19\u0e04\u0e23\u0e34\u0e2a\u0e15\u0e4c\u0e01\u0e32\u0e25\u0e17\u0e35\u0e48"});

   157         ERA_FULL_NAMES.put(FALLBACK_LANGUAGE, new String[]{"Before Buddhist", "Budhhist Era"});

   158         ERA_FULL_NAMES.put(TARGET_LANGUAGE,

   159                 new String[]{"\u0e1e\u0e38\u0e17\u0e18\u0e28\u0e31\u0e01\u0e23\u0e32\u0e0a",

   160                 "\u0e1b\u0e35\u0e01\u0e48\u0e2d\u0e19\u0e04\u0e23\u0e34\u0e2a\u0e15\u0e4c\u0e01\u0e32\u0e25\u0e17\u0e35\u0e48"});

   161     }

   162 

   163     /**

   164      * Restricted constructor.

   165      */

   166     private ThaiBuddhistChronology() {

   167     }

   168 

   169     /**

   170      * Resolve singleton.

   171      *

   172      * @return the singleton instance, not null

   173      */

   174     private Object readResolve() {

   175         return INSTANCE;

   176     }

   177 

   178     //-----------------------------------------------------------------------

   179     /**

   180      * Gets the ID of the chronology - 'ThaiBuddhist'.

   181      * <p>

   182      * The ID uniquely identifies the {@code Chronology}.

   183      * It can be used to lookup the {@code Chronology} using {@link #of(String)}.

   184      *

   185      * @return the chronology ID - 'ThaiBuddhist'

   186      * @see #getCalendarType()

   187      */

   188     @Override

   189     public String getId() {

   190         return "ThaiBuddhist";

   191     }

   192 

   193     /**

   194      * Gets the calendar type of the underlying calendar system - 'buddhist'.

   195      * <p>

   196      * The calendar type is an identifier defined by the

   197      * <em>Unicode Locale Data Markup Language (LDML)</em> specification.

   198      * It can be used to lookup the {@code Chronology} using {@link #of(String)}.

   199      * It can also be used as part of a locale, accessible via

   200      * {@link Locale#getUnicodeLocaleType(String)} with the key 'ca'.

   201      *

   202      * @return the calendar system type - 'buddhist'

   203      * @see #getId()

   204      */

   205     @Override

   206     public String getCalendarType() {

   207         return "buddhist";

   208     }

   209 

   210     //-----------------------------------------------------------------------

   211     @Override

   212     public ThaiBuddhistDate date(int prolepticYear, int month, int dayOfMonth) {

   213         return new ThaiBuddhistDate(LocalDate.of(prolepticYear - YEARS_DIFFERENCE, month, dayOfMonth));

   214     }

   215 

   216     @Override

   217     public ThaiBuddhistDate dateYearDay(int prolepticYear, int dayOfYear) {

   218         return new ThaiBuddhistDate(LocalDate.ofYearDay(prolepticYear - YEARS_DIFFERENCE, dayOfYear));

   219     }

   220 

   221     @Override

   222     public ThaiBuddhistDate date(TemporalAccessor temporal) {

   223         if (temporal instanceof ThaiBuddhistDate) {

   224             return (ThaiBuddhistDate) temporal;

   225         }

   226         return new ThaiBuddhistDate(LocalDate.from(temporal));

   227     }

   228     @Override

   229     public ThaiBuddhistDate date(Era era, int yearOfEra, int month, int dayOfMonth) {

   230         return date(prolepticYear(era, yearOfEra), month, dayOfMonth);

   231 

   232     }

   233 

   234     @Override

   235     public ThaiBuddhistDate dateYearDay(Era era, int yearOfEra, int dayOfYear) {

   236         return dateYearDay(prolepticYear(era, yearOfEra), dayOfYear);

   237     }

   238 

   239     @Override

   240     public ThaiBuddhistDate dateNow() {

   241         return dateNow(Clock.systemDefaultZone());

   242     }

   243 

   244     @Override

   245     public ThaiBuddhistDate dateNow(ZoneId zone) {

   246         return dateNow(Clock.system(zone));

   247     }

   248 

   249     @Override

   250     public ThaiBuddhistDate dateNow(Clock clock) {

   251         return date(LocalDate.now(clock));

   252     }

   253 

   254     @Override

   255     public ChronoLocalDateTime<ThaiBuddhistDate> localDateTime(TemporalAccessor temporal) {

   256         return (ChronoLocalDateTime<ThaiBuddhistDate>)super.localDateTime(temporal);

   257     }

   258 

   259     @Override

   260     public ChronoZonedDateTime<ThaiBuddhistDate> zonedDateTime(TemporalAccessor temporal) {

   261         return (ChronoZonedDateTime<ThaiBuddhistDate>)super.zonedDateTime(temporal);

   262     }

   263 

   264     @Override

   265     public ChronoZonedDateTime<ThaiBuddhistDate> zonedDateTime(Instant instant, ZoneId zone) {

   266         return (ChronoZonedDateTime<ThaiBuddhistDate>)super.zonedDateTime(instant, zone);

   267     }

   268 

   269     //-----------------------------------------------------------------------

   270     /**

   271      * Checks if the specified year is a leap year.

   272      * <p>

   273      * Thai Buddhist leap years occur exactly in line with ISO leap years.

   274      * This method does not validate the year passed in, and only has a

   275      * well-defined result for years in the supported range.

   276      *

   277      * @param prolepticYear  the proleptic-year to check, not validated for range

   278      * @return true if the year is a leap year

   279      */

   280     @Override

   281     public boolean isLeapYear(long prolepticYear) {

   282         return IsoChronology.INSTANCE.isLeapYear(prolepticYear - YEARS_DIFFERENCE);

   283     }

   284 

   285     @Override

   286     public int prolepticYear(Era era, int yearOfEra) {

   287         if (era instanceof ThaiBuddhistEra == false) {

   288             throw new DateTimeException("Era must be BuddhistEra");

   289         }

   290         return (era == ThaiBuddhistEra.BE ? yearOfEra : 1 - yearOfEra);

   291     }

   292 

   293     @Override

   294     public Era eraOf(int eraValue) {

   295         return ThaiBuddhistEra.of(eraValue);

   296     }

   297 

   298     @Override

   299     public List<Era> eras() {

   300         return Arrays.<Era>asList(ThaiBuddhistEra.values());

   301     }

   302 

   303     //-----------------------------------------------------------------------

   304     @Override

   305     public ValueRange range(ChronoField field) {

   306         switch (field) {

   307             case YEAR_OF_ERA: {

   308                 ValueRange range = YEAR.range();

   309                 return ValueRange.of(1, -(range.getMinimum() + YEARS_DIFFERENCE) + 1, range.getMaximum() + YEARS_DIFFERENCE);

   310             }

   311             case YEAR: {

   312                 ValueRange range = YEAR.range();

   313                 return ValueRange.of(range.getMinimum() + YEARS_DIFFERENCE, range.getMaximum() + YEARS_DIFFERENCE);

   314             }

   315         }

   316         return field.range();

   317     }

   318 

   319 }