1 /* 2 * Copyright (c) 2012, 2018, 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 java.io.InvalidObjectException; 60 import static java.time.temporal.ChronoField.PROLEPTIC_MONTH; 61 import static java.time.temporal.ChronoField.YEAR; 62 63 import java.io.ObjectInputStream; 64 import java.io.Serializable; 65 import java.time.Clock; 66 import java.time.DateTimeException; 67 import java.time.Instant; 68 import java.time.LocalDate; 69 import java.time.ZoneId; 70 import java.time.format.ResolverStyle; 71 import java.time.temporal.ChronoField; 72 import java.time.temporal.TemporalAccessor; 73 import java.time.temporal.TemporalField; 74 import java.time.temporal.ValueRange; 75 import java.util.Arrays; 76 import java.util.HashMap; 77 import java.util.List; 78 import java.util.Locale; 79 import java.util.Map; 80 81 /** 82 * The Thai Buddhist calendar system. 83 * <p> 84 * This chronology defines the rules of the Thai Buddhist calendar system. 85 * This calendar system is primarily used in Thailand. 86 * Dates are aligned such that {@code 2484-01-01 (Buddhist)} is {@code 1941-01-01 (ISO)}. 87 * <p> 88 * The fields are defined as follows: 89 * <ul> 90 * <li>era - There are two eras, the current 'Buddhist' (ERA_BE) and the previous era (ERA_BEFORE_BE). 91 * <li>year-of-era - The year-of-era for the current era increases uniformly from the epoch at year one. 92 * For the previous era the year increases from one as time goes backwards. 93 * The value for the current era is equal to the ISO proleptic-year plus 543. 94 * <li>proleptic-year - The proleptic year is the same as the year-of-era for the 95 * current era. For the previous era, years have zero, then negative values. 96 * The value is equal to the ISO proleptic-year plus 543. 97 * <li>month-of-year - The ThaiBuddhist month-of-year exactly matches ISO. 98 * <li>day-of-month - The ThaiBuddhist day-of-month exactly matches ISO. 99 * <li>day-of-year - The ThaiBuddhist day-of-year exactly matches ISO. 100 * <li>leap-year - The ThaiBuddhist leap-year pattern exactly matches ISO, such that the two calendars 101 * are never out of step. 102 * </ul> 103 * 104 * @implSpec 105 * This class is immutable and thread-safe. 106 * 107 * @since 1.8 108 */ 109 public final class ThaiBuddhistChronology extends AbstractChronology implements Serializable { 110 111 /** 112 * Singleton instance of the Buddhist chronology. 113 */ 114 public static final ThaiBuddhistChronology INSTANCE = new ThaiBuddhistChronology(); 115 116 /** 117 * Serialization version. 118 */ 119 @java.io.Serial 120 private static final long serialVersionUID = 2775954514031616474L; 121 /** 122 * Containing the offset to add to the ISO year. 123 */ 124 static final int YEARS_DIFFERENCE = 543; 125 /** 126 * Narrow names for eras. 127 */ 128 private static final HashMap<String, String[]> ERA_NARROW_NAMES = new HashMap<>(); 129 /** 130 * Short names for eras. 131 */ 132 private static final HashMap<String, String[]> ERA_SHORT_NAMES = new HashMap<>(); 133 /** 134 * Full names for eras. 135 */ 136 private static final HashMap<String, String[]> ERA_FULL_NAMES = new HashMap<>(); 137 /** 138 * Fallback language for the era names. 139 */ 140 private static final String FALLBACK_LANGUAGE = "en"; 141 /** 142 * Language that has the era names. 143 */ 144 private static final String TARGET_LANGUAGE = "th"; 145 /** 146 * Name data. 147 */ 148 static { 149 ERA_NARROW_NAMES.put(FALLBACK_LANGUAGE, new String[]{"BB", "BE"}); 150 ERA_NARROW_NAMES.put(TARGET_LANGUAGE, new String[]{"BB", "BE"}); 151 ERA_SHORT_NAMES.put(FALLBACK_LANGUAGE, new String[]{"B.B.", "B.E."}); 152 ERA_SHORT_NAMES.put(TARGET_LANGUAGE, 153 new String[]{"\u0e1e.\u0e28.", 154 "\u0e1b\u0e35\u0e01\u0e48\u0e2d\u0e19\u0e04\u0e23\u0e34\u0e2a\u0e15\u0e4c\u0e01\u0e32\u0e25\u0e17\u0e35\u0e48"}); 155 ERA_FULL_NAMES.put(FALLBACK_LANGUAGE, new String[]{"Before Buddhist", "Budhhist Era"}); 156 ERA_FULL_NAMES.put(TARGET_LANGUAGE, 157 new String[]{"\u0e1e\u0e38\u0e17\u0e18\u0e28\u0e31\u0e01\u0e23\u0e32\u0e0a", 158 "\u0e1b\u0e35\u0e01\u0e48\u0e2d\u0e19\u0e04\u0e23\u0e34\u0e2a\u0e15\u0e4c\u0e01\u0e32\u0e25\u0e17\u0e35\u0e48"}); 159 } 160 161 /** 162 * Restricted constructor. 163 */ 164 private ThaiBuddhistChronology() { 165 } 166 167 //----------------------------------------------------------------------- 168 /** 169 * Gets the ID of the chronology - 'ThaiBuddhist'. 170 * <p> 171 * The ID uniquely identifies the {@code Chronology}. 172 * It can be used to lookup the {@code Chronology} using {@link Chronology#of(String)}. 173 * 174 * @return the chronology ID - 'ThaiBuddhist' 175 * @see #getCalendarType() 176 */ 177 @Override 178 public String getId() { 179 return "ThaiBuddhist"; 180 } 181 182 /** 183 * Gets the calendar type of the underlying calendar system - 'buddhist'. 184 * <p> 185 * The calendar type is an identifier defined by the 186 * <em>Unicode Locale Data Markup Language (LDML)</em> specification. 187 * It can be used to lookup the {@code Chronology} using {@link Chronology#of(String)}. 188 * It can also be used as part of a locale, accessible via 189 * {@link Locale#getUnicodeLocaleType(String)} with the key 'ca'. 190 * 191 * @return the calendar system type - 'buddhist' 192 * @see #getId() 193 */ 194 @Override 195 public String getCalendarType() { 196 return "buddhist"; 197 } 198 199 //----------------------------------------------------------------------- 200 /** 201 * Obtains a local date in Thai Buddhist calendar system from the 202 * era, year-of-era, month-of-year and day-of-month fields. 203 * 204 * @param era the Thai Buddhist era, not null 205 * @param yearOfEra the year-of-era 206 * @param month the month-of-year 207 * @param dayOfMonth the day-of-month 208 * @return the Thai Buddhist local date, not null 209 * @throws DateTimeException if unable to create the date 210 * @throws ClassCastException if the {@code era} is not a {@code ThaiBuddhistEra} 211 */ 212 @Override 213 public ThaiBuddhistDate date(Era era, int yearOfEra, int month, int dayOfMonth) { 214 return date(prolepticYear(era, yearOfEra), month, dayOfMonth); 215 } 216 217 /** 218 * Obtains a local date in Thai Buddhist calendar system from the 219 * proleptic-year, month-of-year and day-of-month fields. 220 * 221 * @param prolepticYear the proleptic-year 222 * @param month the month-of-year 223 * @param dayOfMonth the day-of-month 224 * @return the Thai Buddhist local date, not null 225 * @throws DateTimeException if unable to create the date 226 */ 227 @Override 228 public ThaiBuddhistDate date(int prolepticYear, int month, int dayOfMonth) { 229 return new ThaiBuddhistDate(LocalDate.of(prolepticYear - YEARS_DIFFERENCE, month, dayOfMonth)); 230 } 231 232 /** 233 * Obtains a local date in Thai Buddhist calendar system from the 234 * era, year-of-era and day-of-year fields. 235 * 236 * @param era the Thai Buddhist era, not null 237 * @param yearOfEra the year-of-era 238 * @param dayOfYear the day-of-year 239 * @return the Thai Buddhist local date, not null 240 * @throws DateTimeException if unable to create the date 241 * @throws ClassCastException if the {@code era} is not a {@code ThaiBuddhistEra} 242 */ 243 @Override 244 public ThaiBuddhistDate dateYearDay(Era era, int yearOfEra, int dayOfYear) { 245 return dateYearDay(prolepticYear(era, yearOfEra), dayOfYear); 246 } 247 248 /** 249 * Obtains a local date in Thai Buddhist calendar system from the 250 * proleptic-year and day-of-year fields. 251 * 252 * @param prolepticYear the proleptic-year 253 * @param dayOfYear the day-of-year 254 * @return the Thai Buddhist local date, not null 255 * @throws DateTimeException if unable to create the date 256 */ 257 @Override 258 public ThaiBuddhistDate dateYearDay(int prolepticYear, int dayOfYear) { 259 return new ThaiBuddhistDate(LocalDate.ofYearDay(prolepticYear - YEARS_DIFFERENCE, dayOfYear)); 260 } 261 262 /** 263 * Obtains a local date in the Thai Buddhist calendar system from the epoch-day. 264 * 265 * @param epochDay the epoch day 266 * @return the Thai Buddhist local date, not null 267 * @throws DateTimeException if unable to create the date 268 */ 269 @Override // override with covariant return type 270 public ThaiBuddhistDate dateEpochDay(long epochDay) { 271 return new ThaiBuddhistDate(LocalDate.ofEpochDay(epochDay)); 272 } 273 274 @Override 275 public ThaiBuddhistDate dateNow() { 276 return dateNow(Clock.systemDefaultZone()); 277 } 278 279 @Override 280 public ThaiBuddhistDate dateNow(ZoneId zone) { 281 return dateNow(Clock.system(zone)); 282 } 283 284 @Override 285 public ThaiBuddhistDate dateNow(Clock clock) { 286 return date(LocalDate.now(clock)); 287 } 288 289 @Override 290 public ThaiBuddhistDate date(TemporalAccessor temporal) { 291 if (temporal instanceof ThaiBuddhistDate) { 292 return (ThaiBuddhistDate) temporal; 293 } 294 return new ThaiBuddhistDate(LocalDate.from(temporal)); 295 } 296 297 @Override 298 @SuppressWarnings("unchecked") 299 public ChronoLocalDateTime<ThaiBuddhistDate> localDateTime(TemporalAccessor temporal) { 300 return (ChronoLocalDateTime<ThaiBuddhistDate>)super.localDateTime(temporal); 301 } 302 303 @Override 304 @SuppressWarnings("unchecked") 305 public ChronoZonedDateTime<ThaiBuddhistDate> zonedDateTime(TemporalAccessor temporal) { 306 return (ChronoZonedDateTime<ThaiBuddhistDate>)super.zonedDateTime(temporal); 307 } 308 309 @Override 310 @SuppressWarnings("unchecked") 311 public ChronoZonedDateTime<ThaiBuddhistDate> zonedDateTime(Instant instant, ZoneId zone) { 312 return (ChronoZonedDateTime<ThaiBuddhistDate>)super.zonedDateTime(instant, zone); 313 } 314 315 //----------------------------------------------------------------------- 316 /** 317 * Checks if the specified year is a leap year. 318 * <p> 319 * Thai Buddhist leap years occur exactly in line with ISO leap years. 320 * This method does not validate the year passed in, and only has a 321 * well-defined result for years in the supported range. 322 * 323 * @param prolepticYear the proleptic-year to check, not validated for range 324 * @return true if the year is a leap year 325 */ 326 @Override 327 public boolean isLeapYear(long prolepticYear) { 328 return IsoChronology.INSTANCE.isLeapYear(prolepticYear - YEARS_DIFFERENCE); 329 } 330 331 @Override 332 public int prolepticYear(Era era, int yearOfEra) { 333 if (era instanceof ThaiBuddhistEra == false) { 334 throw new ClassCastException("Era must be BuddhistEra"); 335 } 336 return (era == ThaiBuddhistEra.BE ? yearOfEra : 1 - yearOfEra); 337 } 338 339 @Override 340 public ThaiBuddhistEra eraOf(int eraValue) { 341 return ThaiBuddhistEra.of(eraValue); 342 } 343 344 @Override 345 public List<Era> eras() { 346 return List.of(ThaiBuddhistEra.values()); 347 } 348 349 //----------------------------------------------------------------------- 350 @Override 351 public ValueRange range(ChronoField field) { 352 switch (field) { 353 case PROLEPTIC_MONTH: { 354 ValueRange range = PROLEPTIC_MONTH.range(); 355 return ValueRange.of(range.getMinimum() + YEARS_DIFFERENCE * 12L, range.getMaximum() + YEARS_DIFFERENCE * 12L); 356 } 357 case YEAR_OF_ERA: { 358 ValueRange range = YEAR.range(); 359 return ValueRange.of(1, -(range.getMinimum() + YEARS_DIFFERENCE) + 1, range.getMaximum() + YEARS_DIFFERENCE); 360 } 361 case YEAR: { 362 ValueRange range = YEAR.range(); 363 return ValueRange.of(range.getMinimum() + YEARS_DIFFERENCE, range.getMaximum() + YEARS_DIFFERENCE); 364 } 365 } 366 return field.range(); 367 } 368 369 //----------------------------------------------------------------------- 370 @Override // override for return type 371 public ThaiBuddhistDate resolveDate(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) { 372 return (ThaiBuddhistDate) super.resolveDate(fieldValues, resolverStyle); 373 } 374 375 //----------------------------------------------------------------------- 376 /** 377 * Writes the Chronology using a 378 * <a href="{@docRoot}/serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>. 379 * @serialData 380 * <pre> 381 * out.writeByte(1); // identifies a Chronology 382 * out.writeUTF(getId()); 383 * </pre> 384 * 385 * @return the instance of {@code Ser}, not null 386 */ 387 @Override 388 @java.io.Serial 389 Object writeReplace() { 390 return super.writeReplace(); 391 } 392 393 /** 394 * Defend against malicious streams. 395 * 396 * @param s the stream to read 397 * @throws InvalidObjectException always 398 */ 399 @java.io.Serial 400 private void readObject(ObjectInputStream s) throws InvalidObjectException { 401 throw new InvalidObjectException("Deserialization via serialization delegate"); 402 } 403 }