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.calendar;

    58 

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

    60 

    61 import java.io.Serializable;

    62 import java.time.DateTimeException;

    63 import java.time.LocalDate;

    64 import java.time.temporal.Chrono;

    65 import java.time.temporal.ChronoField;

    66 import java.time.temporal.ChronoLocalDate;

    67 import java.time.temporal.Era;

    68 import java.time.temporal.ISOChrono;

    69 import java.time.temporal.TemporalAccessor;

    70 import java.time.temporal.ValueRange;

    71 import java.util.Arrays;

    72 import java.util.HashMap;

    73 import java.util.List;

    74 import java.util.Locale;

    75 

    76 /**

    77  * The Thai Buddhist calendar system.

    78  * <p>

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

    80  * This calendar system is primarily used in Thailand.

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

    82  * <p>

    83  * The fields are defined as follows:

    84  * <p><ul>

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

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

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

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

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

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

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

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

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

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

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

    96  *  are never out of step.

    97  * </ul><p>

    98  *

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

   100  * This class is immutable and thread-safe.

   101  *

   102  * @since 1.8

   103  */

   104 public final class ThaiBuddhistChrono extends Chrono<ThaiBuddhistChrono> implements Serializable {

   105 

   106     /**

   107      * Singleton instance of the Buddhist chronology.

   108      */

   109     public static final ThaiBuddhistChrono INSTANCE = new ThaiBuddhistChrono();

   110     /**

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

   112      * which has the value 0.

   113      */

   114     public static final Era<ThaiBuddhistChrono> ERA_BEFORE_BE = ThaiBuddhistEra.BEFORE_BE;

   115     /**

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

   117      */

   118     public static final Era<ThaiBuddhistChrono> ERA_BE = ThaiBuddhistEra.BE;

   119 

   120     /**

   121      * Serialization version.

   122      */

   123     private static final long serialVersionUID = 2775954514031616474L;

   124     /**

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

   126      */

   127     static final int YEARS_DIFFERENCE = 543;

   128     /**

   129      * Narrow names for eras.

   130      */

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

   132     /**

   133      * Short names for eras.

   134      */

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

   136     /**

   137      * Full names for eras.

   138      */

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

   140     /**

   141      * Fallback language for the era names.

   142      */

   143     private static final String FALLBACK_LANGUAGE = "en";

   144     /**

   145      * Language that has the era names.

   146      */

   147     private static final String TARGET_LANGUAGE = "th";

   148     /**

   149      * Name data.

   150      */

   151     static {

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

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

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

   155         ERA_SHORT_NAMES.put(TARGET_LANGUAGE,

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

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

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

   159         ERA_FULL_NAMES.put(TARGET_LANGUAGE,

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

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

   162     }

   163 

   164     /**

   165      * Restricted constructor.

   166      */

   167     private ThaiBuddhistChrono() {

   168     }

   169 

   170     /**

   171      * Resolve singleton.

   172      *

   173      * @return the singleton instance, not null

   174      */

   175     private Object readResolve() {

   176         return INSTANCE;

   177     }

   178 

   179     //-----------------------------------------------------------------------

   180     /**

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

   182      * <p>

   183      * The ID uniquely identifies the {@code Chrono}.

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

   185      *

   186      * @return the chronology ID - 'ThaiBuddhist'

   187      * @see #getCalendarType()

   188      */

   189     @Override

   190     public String getId() {

   191         return "ThaiBuddhist";

   192     }

   193 

   194     /**

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

   196      * <p>

   197      * The calendar type is an identifier defined by the

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

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

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

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

   202      *

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

   204      * @see #getId()

   205      */

   206     @Override

   207     public String getCalendarType() {

   208         return "buddhist";

   209     }

   210 

   211     //-----------------------------------------------------------------------

   212     @Override

   213     public ChronoLocalDate<ThaiBuddhistChrono> date(int prolepticYear, int month, int dayOfMonth) {

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

   215     }

   216 

   217     @Override

   218     public ChronoLocalDate<ThaiBuddhistChrono> dateYearDay(int prolepticYear, int dayOfYear) {

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

   220     }

   221 

   222     @Override

   223     public ChronoLocalDate<ThaiBuddhistChrono> date(TemporalAccessor temporal) {

   224         if (temporal instanceof ThaiBuddhistDate) {

   225             return (ThaiBuddhistDate) temporal;

   226         }

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

   228     }

   229 

   230     //-----------------------------------------------------------------------

   231     /**

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

   233      * <p>

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

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

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

   237      *

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

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

   240      */

   241     @Override

   242     public boolean isLeapYear(long prolepticYear) {

   243         return ISOChrono.INSTANCE.isLeapYear(prolepticYear - YEARS_DIFFERENCE);

   244     }

   245 

   246     @Override

   247     public int prolepticYear(Era<ThaiBuddhistChrono> era, int yearOfEra) {

   248         if (era instanceof ThaiBuddhistEra == false) {

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

   250         }

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

   252     }

   253 

   254     @Override

   255     public Era<ThaiBuddhistChrono> eraOf(int eraValue) {

   256         return ThaiBuddhistEra.of(eraValue);

   257     }

   258 

   259     @Override

   260     public List<Era<ThaiBuddhistChrono>> eras() {

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

   262     }

   263 

   264     //-----------------------------------------------------------------------

   265     @Override

   266     public ValueRange range(ChronoField field) {

   267         switch (field) {

   268             case YEAR_OF_ERA: {

   269                 ValueRange range = YEAR.range();

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

   271             }

   272             case YEAR: {

   273                 ValueRange range = YEAR.range();

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

   275             }

   276         }

   277         return field.range();

   278     }

   279 

   280 }