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 }