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.PROLEPTIC_MONTH; 60 import static java.time.temporal.ChronoField.YEAR; 61 62 import java.io.Serializable; 63 import java.time.Clock; 64 import java.time.DateTimeException; 65 import java.time.Instant; 66 import java.time.LocalDate; 67 import java.time.ZoneId; 68 import java.time.temporal.ChronoField; 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 1912-01-01 (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 MinguoChronology extends Chronology implements Serializable { 104 105 /** 106 * Singleton instance for the Minguo chronology. 107 */ 108 public static final MinguoChronology INSTANCE = new MinguoChronology(); 109 110 /** 111 * Serialization version. 112 */ 113 private static final long serialVersionUID = 1039765215346859963L; 114 /** 115 * The difference in years between ISO and Minguo. 116 */ 117 static final int YEARS_DIFFERENCE = 1911; 118 119 /** 120 * Restricted constructor. 121 */ 122 private MinguoChronology() { 123 } 124 125 //----------------------------------------------------------------------- 126 /** 127 * Gets the ID of the chronology - 'Minguo'. 128 * <p> 129 * The ID uniquely identifies the {@code Chronology}. 130 * It can be used to lookup the {@code Chronology} using {@link #of(String)}. 131 * 132 * @return the chronology ID - 'Minguo' 133 * @see #getCalendarType() 134 */ 135 @Override 136 public String getId() { 137 return "Minguo"; 138 } 139 140 /** 141 * Gets the calendar type of the underlying calendar system - 'roc'. 142 * <p> 143 * The calendar type is an identifier defined by the 144 * <em>Unicode Locale Data Markup Language (LDML)</em> specification. 145 * It can be used to lookup the {@code Chronology} using {@link #of(String)}. 146 * It can also be used as part of a locale, accessible via 147 * {@link Locale#getUnicodeLocaleType(String)} with the key 'ca'. 148 * 149 * @return the calendar system type - 'roc' 150 * @see #getId() 151 */ 152 @Override 153 public String getCalendarType() { 154 return "roc"; 155 } 156 157 //----------------------------------------------------------------------- 158 /** 159 * Obtains a local date in Minguo calendar system from the 160 * era, year-of-era, month-of-year and day-of-month fields. 161 * 162 * @param era the Minguo era, not null 163 * @param yearOfEra the year-of-era 164 * @param month the month-of-year 165 * @param dayOfMonth the day-of-month 166 * @return the Minguo local date, not null 167 * @throws DateTimeException if unable to create the date 168 * @throws ClassCastException if the {@code era} is not a {@code MinguoEra} 169 */ 170 @Override 171 public MinguoDate date(Era era, int yearOfEra, int month, int dayOfMonth) { 172 return date(prolepticYear(era, yearOfEra), month, dayOfMonth); 173 } 174 175 /** 176 * Obtains a local date in Minguo calendar system from the 177 * proleptic-year, month-of-year and day-of-month fields. 178 * 179 * @param prolepticYear the proleptic-year 180 * @param month the month-of-year 181 * @param dayOfMonth the day-of-month 182 * @return the Minguo local date, not null 183 * @throws DateTimeException if unable to create the date 184 */ 185 @Override 186 public MinguoDate date(int prolepticYear, int month, int dayOfMonth) { 187 return new MinguoDate(LocalDate.of(prolepticYear + YEARS_DIFFERENCE, month, dayOfMonth)); 188 } 189 190 /** 191 * Obtains a local date in Minguo calendar system from the 192 * era, year-of-era and day-of-year fields. 193 * 194 * @param era the Minguo era, not null 195 * @param yearOfEra the year-of-era 196 * @param dayOfYear the day-of-year 197 * @return the Minguo local date, not null 198 * @throws DateTimeException if unable to create the date 199 * @throws ClassCastException if the {@code era} is not a {@code MinguoEra} 200 */ 201 @Override 202 public MinguoDate dateYearDay(Era era, int yearOfEra, int dayOfYear) { 203 return dateYearDay(prolepticYear(era, yearOfEra), dayOfYear); 204 } 205 206 /** 207 * Obtains a local date in Minguo calendar system from the 208 * proleptic-year and day-of-year fields. 209 * 210 * @param prolepticYear the proleptic-year 211 * @param dayOfYear the day-of-year 212 * @return the Minguo local date, not null 213 * @throws DateTimeException if unable to create the date 214 */ 215 @Override 216 public MinguoDate dateYearDay(int prolepticYear, int dayOfYear) { 217 return new MinguoDate(LocalDate.ofYearDay(prolepticYear + YEARS_DIFFERENCE, dayOfYear)); 218 } 219 220 /** 221 * Obtains a local date in the Minguo calendar system from the epoch-day. 222 * 223 * @param epochDay the epoch day 224 * @return the Minguo local date, not null 225 * @throws DateTimeException if unable to create the date 226 */ 227 @Override // override with covariant return type 228 public MinguoDate dateEpochDay(long epochDay) { 229 return new MinguoDate(LocalDate.ofEpochDay(epochDay)); 230 } 231 232 @Override 233 public MinguoDate dateNow() { 234 return dateNow(Clock.systemDefaultZone()); 235 } 236 237 @Override 238 public MinguoDate dateNow(ZoneId zone) { 239 return dateNow(Clock.system(zone)); 240 } 241 242 @Override 243 public MinguoDate dateNow(Clock clock) { 244 return date(LocalDate.now(clock)); 245 } 246 247 @Override 248 public MinguoDate date(TemporalAccessor temporal) { 249 if (temporal instanceof MinguoDate) { 250 return (MinguoDate) temporal; 251 } 252 return new MinguoDate(LocalDate.from(temporal)); 253 } 254 255 @Override 256 public ChronoLocalDateTime<MinguoDate> localDateTime(TemporalAccessor temporal) { 257 return (ChronoLocalDateTime<MinguoDate>)super.localDateTime(temporal); 258 } 259 260 @Override 261 public ChronoZonedDateTime<MinguoDate> zonedDateTime(TemporalAccessor temporal) { 262 return (ChronoZonedDateTime<MinguoDate>)super.zonedDateTime(temporal); 263 } 264 265 @Override 266 public ChronoZonedDateTime<MinguoDate> zonedDateTime(Instant instant, ZoneId zone) { 267 return (ChronoZonedDateTime<MinguoDate>)super.zonedDateTime(instant, zone); 268 } 269 270 //----------------------------------------------------------------------- 271 /** 272 * Checks if the specified year is a leap year. 273 * <p> 274 * Minguo leap years occur exactly in line with ISO leap years. 275 * This method does not validate the year passed in, and only has a 276 * well-defined result for years in the supported range. 277 * 278 * @param prolepticYear the proleptic-year to check, not validated for range 279 * @return true if the year is a leap year 280 */ 281 @Override 282 public boolean isLeapYear(long prolepticYear) { 283 return IsoChronology.INSTANCE.isLeapYear(prolepticYear + YEARS_DIFFERENCE); 284 } 285 286 @Override 287 public int prolepticYear(Era era, int yearOfEra) { 288 if (era instanceof MinguoEra == false) { 289 throw new ClassCastException("Era must be MinguoEra"); 290 } 291 return (era == MinguoEra.ROC ? yearOfEra : 1 - yearOfEra); 292 } 293 294 @Override 295 public Era eraOf(int eraValue) { 296 return MinguoEra.of(eraValue); 297 } 298 299 @Override 300 public List<Era> eras() { 301 return Arrays.<Era>asList(MinguoEra.values()); 302 } 303 304 //----------------------------------------------------------------------- 305 @Override 306 public ValueRange range(ChronoField field) { 307 switch (field) { 308 case PROLEPTIC_MONTH: { 309 ValueRange range = PROLEPTIC_MONTH.range(); 310 return ValueRange.of(range.getMinimum() - YEARS_DIFFERENCE * 12L, range.getMaximum() - YEARS_DIFFERENCE * 12L); 311 } 312 case YEAR_OF_ERA: { 313 ValueRange range = YEAR.range(); 314 return ValueRange.of(1, range.getMaximum() - YEARS_DIFFERENCE, -range.getMinimum() + 1 + YEARS_DIFFERENCE); 315 } 316 case YEAR: { 317 ValueRange range = YEAR.range(); 318 return ValueRange.of(range.getMinimum() - YEARS_DIFFERENCE, range.getMaximum() - YEARS_DIFFERENCE); 319 } 320 } 321 return field.range(); 322 } 323 324 }