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 }
--- EOF ---