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.List;

    73 import java.util.Locale;

    74 

    75 /**

    76  * The Minguo calendar system.

    77  * <p>

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

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

    80  * Dates are aligned such that {@code 0001-01-01 (Minguo)} is {@code 1911-01-01 (ISO)}.

    81  * <p>

    82  * The fields are defined as follows:

    83  * <p><ul>

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

    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 minus 1911.

    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 minus 1911.

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

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

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

    94  * <li>leap-year - The Minguo 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 MinguoChrono extends Chrono<MinguoChrono> implements Serializable {

   104 

   105     /**

   106      * Singleton instance for the Minguo chronology.

   107      */

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

   109 

   110     /**

   111      * The singleton instance for the era ROC.

   112      */

   113     public static final Era<MinguoChrono> ERA_ROC = MinguoEra.ROC;

   114 

   115     /**

   116      * The singleton instance for the era BEFORE_ROC.

   117      */

   118     public static final Era<MinguoChrono> ERA_BEFORE_ROC = MinguoEra.BEFORE_ROC;

   119 

   120     /**

   121      * Serialization version.

   122      */

   123     private static final long serialVersionUID = 1039765215346859963L;

   124     /**

   125      * The difference in years between ISO and Minguo.

   126      */

   127     static final int YEARS_DIFFERENCE = 1911;

   128 

   129     /**

   130      * Restricted constructor.

   131      */

   132     private MinguoChrono() {

   133     }

   134 

   135     /**

   136      * Resolve singleton.

   137      *

   138      * @return the singleton instance, not null

   139      */

   140     private Object readResolve() {

   141         return INSTANCE;

   142     }

   143 

   144     //-----------------------------------------------------------------------

   145     /**

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

   147      * <p>

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

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

   150      *

   151      * @return the chronology ID - 'Minguo'

   152      * @see #getCalendarType()

   153      */

   154     @Override

   155     public String getId() {

   156         return "Minguo";

   157     }

   158 

   159     /**

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

   161      * <p>

   162      * The calendar type is an identifier defined by the

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

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

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

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

   167      *

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

   169      * @see #getId()

   170      */

   171     @Override

   172     public String getCalendarType() {

   173         return "roc";

   174     }

   175 

   176     //-----------------------------------------------------------------------

   177     @Override

   178     public ChronoLocalDate<MinguoChrono> date(int prolepticYear, int month, int dayOfMonth) {

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

   180     }

   181 

   182     @Override

   183     public ChronoLocalDate<MinguoChrono> dateYearDay(int prolepticYear, int dayOfYear) {

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

   185     }

   186 

   187     @Override

   188     public ChronoLocalDate<MinguoChrono> date(TemporalAccessor temporal) {

   189         if (temporal instanceof MinguoDate) {

   190             return (MinguoDate) temporal;

   191         }

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

   193     }

   194 

   195     //-----------------------------------------------------------------------

   196     /**

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

   198      * <p>

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

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

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

   202      *

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

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

   205      */

   206     @Override

   207     public boolean isLeapYear(long prolepticYear) {

   208         return ISOChrono.INSTANCE.isLeapYear(prolepticYear + YEARS_DIFFERENCE);

   209     }

   210 

   211     @Override

   212     public int prolepticYear(Era<MinguoChrono> era, int yearOfEra) {

   213         if (era instanceof MinguoEra == false) {

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

   215         }

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

   217     }

   218 

   219     @Override

   220     public Era<MinguoChrono> eraOf(int eraValue) {

   221         return MinguoEra.of(eraValue);

   222     }

   223 

   224     @Override

   225     public List<Era<MinguoChrono>> eras() {

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

   227     }

   228 

   229     //-----------------------------------------------------------------------

   230     @Override

   231     public ValueRange range(ChronoField field) {

   232         switch (field) {

   233             case YEAR_OF_ERA: {

   234                 ValueRange range = YEAR.range();

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

   236             }

   237             case YEAR: {

   238                 ValueRange range = YEAR.range();

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

   240             }

   241         }

   242         return field.range();

   243     }

   244 

   245 }