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.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.List;

    72 import java.util.Locale;

    73 

    74 /**

    75  * The Minguo calendar system.

    76  * <p>

    77  * This chronology defines the rules of the Minguo calendar system.

    78  * This calendar system is primarily used in the Republic of China, often known as Taiwan.

    79  * Dates are aligned such that {@code 0001-01-01 (Minguo)} is {@code 1912-01-01 (ISO)}.

    80  * <p>

    81  * The fields are defined as follows:

    82  * <p><ul>

    83  * <li>era - There are two eras, the current 'Republic' (ERA_ROC) and the previous era (ERA_BEFORE_ROC).

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

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

    86  *  The value for the current era is equal to the ISO proleptic-year minus 1911.

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

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

    89  *  The value is equal to the ISO proleptic-year minus 1911.

    90  * <li>month-of-year - The Minguo month-of-year exactly matches ISO.

    91  * <li>day-of-month - The Minguo day-of-month exactly matches ISO.

    92  * <li>day-of-year - The Minguo day-of-year exactly matches ISO.

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

    94  *  are never out of step.

    95  * </ul><p>

    96  *

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

    98  * This class is immutable and thread-safe.

    99  *

   100  * @since 1.8

   101  */

   102 public final class MinguoChronology extends Chronology implements Serializable {

   103 

   104     /**

   105      * Singleton instance for the Minguo chronology.

   106      */

   107     public static final MinguoChronology INSTANCE = new MinguoChronology();

   108 

   109     /**

   110      * The singleton instance for the era ROC.

   111      */

   112     public static final Era ERA_ROC = MinguoEra.ROC;

   113 

   114     /**

   115      * The singleton instance for the era BEFORE_ROC.

   116      */

   117     public static final Era ERA_BEFORE_ROC = MinguoEra.BEFORE_ROC;

   118 

   119     /**

   120      * Serialization version.

   121      */

   122     private static final long serialVersionUID = 1039765215346859963L;

   123     /**

   124      * The difference in years between ISO and Minguo.

   125      */

   126     static final int YEARS_DIFFERENCE = 1911;

   127 

   128     /**

   129      * Restricted constructor.

   130      */

   131     private MinguoChronology() {

   132     }

   133 

   134     /**

   135      * Resolve singleton.

   136      *

   137      * @return the singleton instance, not null

   138      */

   139     private Object readResolve() {

   140         return INSTANCE;

   141     }

   142 

   143     //-----------------------------------------------------------------------

   144     /**

   145      * Gets the ID of the chronology - 'Minguo'.

   146      * <p>

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

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

   149      *

   150      * @return the chronology ID - 'Minguo'

   151      * @see #getCalendarType()

   152      */

   153     @Override

   154     public String getId() {

   155         return "Minguo";

   156     }

   157 

   158     /**

   159      * Gets the calendar type of the underlying calendar system - 'roc'.

   160      * <p>

   161      * The calendar type is an identifier defined by the

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

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

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

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

   166      *

   167      * @return the calendar system type - 'roc'

   168      * @see #getId()

   169      */

   170     @Override

   171     public String getCalendarType() {

   172         return "roc";

   173     }

   174 

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

   176     @Override

   177     public MinguoDate date(int prolepticYear, int month, int dayOfMonth) {

   178         return new MinguoDate(LocalDate.of(prolepticYear + YEARS_DIFFERENCE, month, dayOfMonth));

   179     }

   180 

   181     @Override

   182     public MinguoDate dateYearDay(int prolepticYear, int dayOfYear) {

   183         return new MinguoDate(LocalDate.ofYearDay(prolepticYear + YEARS_DIFFERENCE, dayOfYear));

   184     }

   185 

   186     @Override

   187     public MinguoDate date(TemporalAccessor temporal) {

   188         if (temporal instanceof MinguoDate) {

   189             return (MinguoDate) temporal;

   190         }

   191         return new MinguoDate(LocalDate.from(temporal));

   192     }

   193     @Override

   194     public MinguoDate date(Era era, int yearOfEra, int month, int dayOfMonth) {

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

   196 

   197     }

   198 

   199     @Override

   200     public MinguoDate dateYearDay(Era era, int yearOfEra, int dayOfYear) {

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

   202     }

   203 

   204     @Override

   205     public MinguoDate dateNow() {

   206         return dateNow(Clock.systemDefaultZone());

   207     }

   208 

   209     @Override

   210     public MinguoDate dateNow(ZoneId zone) {

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

   212     }

   213 

   214     @Override

   215     public MinguoDate dateNow(Clock clock) {

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

   217     }

   218 

   219     @Override

   220     public ChronoLocalDateTime<MinguoDate> localDateTime(TemporalAccessor temporal) {

   221         return (ChronoLocalDateTime<MinguoDate>)super.localDateTime(temporal);

   222     }

   223 

   224     @Override

   225     public ChronoZonedDateTime<MinguoDate> zonedDateTime(TemporalAccessor temporal) {

   226         return (ChronoZonedDateTime<MinguoDate>)super.zonedDateTime(temporal);

   227     }

   228 

   229     @Override

   230     public ChronoZonedDateTime<MinguoDate> zonedDateTime(Instant instant, ZoneId zone) {

   231         return (ChronoZonedDateTime<MinguoDate>)super.zonedDateTime(instant, zone);

   232     }

   233 

   234     //-----------------------------------------------------------------------

   235     /**

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

   237      * <p>

   238      * Minguo leap years occur exactly in line with ISO leap years.

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

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

   241      *

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

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

   244      */

   245     @Override

   246     public boolean isLeapYear(long prolepticYear) {

   247         return IsoChronology.INSTANCE.isLeapYear(prolepticYear + YEARS_DIFFERENCE);

   248     }

   249 

   250     @Override

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

   252         if (era instanceof MinguoEra == false) {

   253             throw new DateTimeException("Era must be MinguoEra");

   254         }

   255         return (era == MinguoEra.ROC ? yearOfEra : 1 - yearOfEra);

   256     }

   257 

   258     @Override

   259     public Era eraOf(int eraValue) {

   260         return MinguoEra.of(eraValue);

   261     }

   262 

   263     @Override

   264     public List<Era> eras() {

   265         return Arrays.<Era>asList(MinguoEra.values());

   266     }

   267 

   268     //-----------------------------------------------------------------------

   269     @Override

   270     public ValueRange range(ChronoField field) {

   271         switch (field) {

   272             case YEAR_OF_ERA: {

   273                 ValueRange range = YEAR.range();

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

   275             }

   276             case YEAR: {

   277                 ValueRange range = YEAR.range();

   278                 return ValueRange.of(range.getMinimum() - YEARS_DIFFERENCE, range.getMaximum() - YEARS_DIFFERENCE);

   279             }

   280         }

   281         return field.range();

   282     }

   283 

   284 }