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) 2011-2012, 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.temporal; 58 59 import static java.time.DayOfWeek.THURSDAY; 60 import static java.time.DayOfWeek.WEDNESDAY; 61 import static java.time.temporal.ChronoField.DAY_OF_WEEK; 62 import static java.time.temporal.ChronoField.DAY_OF_YEAR; 63 import static java.time.temporal.ChronoField.EPOCH_DAY; 64 import static java.time.temporal.ChronoField.MONTH_OF_YEAR; 65 import static java.time.temporal.ChronoField.YEAR; 66 import static java.time.temporal.ChronoUnit.DAYS; 67 import static java.time.temporal.ChronoUnit.FOREVER; 68 import static java.time.temporal.ChronoUnit.MONTHS; 69 import static java.time.temporal.ChronoUnit.WEEKS; 70 import static java.time.temporal.ChronoUnit.YEARS; 71 72 import java.time.DateTimeException; 73 import java.time.Duration; 74 import java.time.LocalDate; 75 import java.time.chrono.ChronoLocalDate; 76 import java.time.chrono.Chronology; 77 import java.time.chrono.IsoChronology; 78 import java.time.format.ResolverStyle; 79 import java.util.Locale; 80 import java.util.Map; 81 import java.util.Objects; 82 import java.util.ResourceBundle; 83 84 import sun.util.locale.provider.LocaleProviderAdapter; 85 import sun.util.locale.provider.LocaleResources; 86 87 /** 88 * Fields and units specific to the ISO-8601 calendar system, 89 * including quarter-of-year and week-based-year. 90 * <p> 91 * This class defines fields and units that are specific to the ISO calendar system. 92 * 93 * <h3>Quarter of year</h3> 94 * The ISO-8601 standard is based on the standard civic 12 month year. 95 * This is commonly divided into four quarters, often abbreviated as Q1, Q2, Q3 and Q4. 96 * <p> 97 * January, February and March are in Q1. 98 * April, May and June are in Q2. 99 * July, August and September are in Q3. 100 * October, November and December are in Q4. 101 * <p> 102 * The complete date is expressed using three fields: 103 * <ul> 104 * <li>{@link #DAY_OF_QUARTER DAY_OF_QUARTER} - the day within the quarter, from 1 to 90, 91 or 92 105 * <li>{@link #QUARTER_OF_YEAR QUARTER_OF_YEAR} - the week within the week-based-year 106 * <li>{@link ChronoField#YEAR YEAR} - the standard ISO year 107 * </ul> 108 * 109 * <h3>Week based years</h3> 110 * The ISO-8601 standard was originally intended as a data interchange format, 111 * defining a string format for dates and times. However, it also defines an 112 * alternate way of expressing the date, based on the concept of week-based-year. 113 * <p> 114 * The date is expressed using three fields: 115 * <ul> 116 * <li>{@link ChronoField#DAY_OF_WEEK DAY_OF_WEEK} - the standard field defining the 117 * day-of-week from Monday (1) to Sunday (7) 118 * <li>{@link #WEEK_OF_WEEK_BASED_YEAR} - the week within the week-based-year 119 * <li>{@link #WEEK_BASED_YEAR WEEK_BASED_YEAR} - the week-based-year 120 * </ul> 121 * The week-based-year itself is defined relative to the standard ISO proleptic year. 122 * It differs from the standard year in that it always starts on a Monday. 123 * <p> 124 * The first week of a week-based-year is the first Monday-based week of the standard 125 * ISO year that has at least 4 days in the new year. 126 * <ul> 127 * <li>If January 1st is Monday then week 1 starts on January 1st 128 * <li>If January 1st is Tuesday then week 1 starts on December 31st of the previous standard year 129 * <li>If January 1st is Wednesday then week 1 starts on December 30th of the previous standard year 130 * <li>If January 1st is Thursday then week 1 starts on December 29th of the previous standard year 131 * <li>If January 1st is Friday then week 1 starts on January 4th 132 * <li>If January 1st is Saturday then week 1 starts on January 3rd 133 * <li>If January 1st is Sunday then week 1 starts on January 2nd 134 * </ul> 135 * There are 52 weeks in most week-based years, however on occasion there are 53 weeks. 136 * <p> 137 * For example: 138 * 139 * <table cellpadding="0" cellspacing="3" border="0" style="text-align: left; width: 50%;"> 140 * <caption>Examples of Week based Years</caption> 141 * <tr><th>Date</th><th>Day-of-week</th><th>Field values</th></tr> 142 * <tr><th>2008-12-28</th><td>Sunday</td><td>Week 52 of week-based-year 2008</td></tr> 143 * <tr><th>2008-12-29</th><td>Monday</td><td>Week 1 of week-based-year 2009</td></tr> 144 * <tr><th>2008-12-31</th><td>Wednesday</td><td>Week 1 of week-based-year 2009</td></tr> 145 * <tr><th>2009-01-01</th><td>Thursday</td><td>Week 1 of week-based-year 2009</td></tr> 146 * <tr><th>2009-01-04</th><td>Sunday</td><td>Week 1 of week-based-year 2009</td></tr> 147 * <tr><th>2009-01-05</th><td>Monday</td><td>Week 2 of week-based-year 2009</td></tr> 148 * </table> 149 * 150 * @implSpec 151 * <p> 152 * This class is immutable and thread-safe. 153 * 154 * @since 1.8 155 */ 156 public final class IsoFields { 157 158 /** 159 * The field that represents the day-of-quarter. 160 * <p> 161 * This field allows the day-of-quarter value to be queried and set. 162 * The day-of-quarter has values from 1 to 90 in Q1 of a standard year, from 1 to 91 163 * in Q1 of a leap year, from 1 to 91 in Q2 and from 1 to 92 in Q3 and Q4. 164 * <p> 165 * The day-of-quarter can only be calculated if the day-of-year, month-of-year and year 166 * are available. 167 * <p> 168 * When setting this field, the value is allowed to be partially lenient, taking any 169 * value from 1 to 92. If the quarter has less than 92 days, then day 92, and 170 * potentially day 91, is in the following quarter. 171 * <p> 172 * In the resolving phase of parsing, a date can be created from a year, 173 * quarter-of-year and day-of-quarter. 174 * <p> 175 * In {@linkplain ResolverStyle#STRICT strict mode}, all three fields are 176 * validated against their range of valid values. The day-of-quarter field 177 * is validated from 1 to 90, 91 or 92 depending on the year and quarter. 178 * <p> 179 * In {@linkplain ResolverStyle#SMART smart mode}, all three fields are 180 * validated against their range of valid values. The day-of-quarter field is 181 * validated between 1 and 92, ignoring the actual range based on the year and quarter. 182 * If the day-of-quarter exceeds the actual range by one day, then the resulting date 183 * is one day later. If the day-of-quarter exceeds the actual range by two days, 184 * then the resulting date is two days later. 185 * <p> 186 * In {@linkplain ResolverStyle#LENIENT lenient mode}, only the year is validated 187 * against the range of valid values. The resulting date is calculated equivalent to 188 * the following three stage approach. First, create a date on the first of January 189 * in the requested year. Then take the quarter-of-year, subtract one, and add the 190 * amount in quarters to the date. Finally, take the day-of-quarter, subtract one, 191 * and add the amount in days to the date. 192 * <p> 193 * This unit is an immutable and thread-safe singleton. 194 */ 195 public static final TemporalField DAY_OF_QUARTER = Field.DAY_OF_QUARTER; 196 /** 197 * The field that represents the quarter-of-year. 198 * <p> 199 * This field allows the quarter-of-year value to be queried and set. 200 * The quarter-of-year has values from 1 to 4. 201 * <p> 202 * The quarter-of-year can only be calculated if the month-of-year is available. 203 * <p> 204 * In the resolving phase of parsing, a date can be created from a year, 205 * quarter-of-year and day-of-quarter. 206 * See {@link #DAY_OF_QUARTER} for details. 207 * <p> 208 * This unit is an immutable and thread-safe singleton. 209 */ 210 public static final TemporalField QUARTER_OF_YEAR = Field.QUARTER_OF_YEAR; 211 /** 212 * The field that represents the week-of-week-based-year. 213 * <p> 214 * This field allows the week of the week-based-year value to be queried and set. 215 * The week-of-week-based-year has values from 1 to 52, or 53 if the 216 * week-based-year has 53 weeks. 217 * <p> 218 * In the resolving phase of parsing, a date can be created from a 219 * week-based-year, week-of-week-based-year and day-of-week. 220 * <p> 221 * In {@linkplain ResolverStyle#STRICT strict mode}, all three fields are 222 * validated against their range of valid values. The week-of-week-based-year 223 * field is validated from 1 to 52 or 53 depending on the week-based-year. 224 * <p> 225 * In {@linkplain ResolverStyle#SMART smart mode}, all three fields are 226 * validated against their range of valid values. The week-of-week-based-year 227 * field is validated between 1 and 53, ignoring the week-based-year. 228 * If the week-of-week-based-year is 53, but the week-based-year only has 229 * 52 weeks, then the resulting date is in week 1 of the following week-based-year. 230 * <p> 231 * In {@linkplain ResolverStyle#LENIENT lenient mode}, only the week-based-year 232 * is validated against the range of valid values. If the day-of-week is outside 233 * the range 1 to 7, then the resulting date is adjusted by a suitable number of 234 * weeks to reduce the day-of-week to the range 1 to 7. If the week-of-week-based-year 235 * value is outside the range 1 to 52, then any excess weeks are added or subtracted 236 * from the resulting date. 237 * <p> 238 * This unit is an immutable and thread-safe singleton. 239 */ 240 public static final TemporalField WEEK_OF_WEEK_BASED_YEAR = Field.WEEK_OF_WEEK_BASED_YEAR; 241 /** 242 * The field that represents the week-based-year. 243 * <p> 244 * This field allows the week-based-year value to be queried and set. 245 * <p> 246 * The field has a range that matches {@link LocalDate#MAX} and {@link LocalDate#MIN}. 247 * <p> 248 * In the resolving phase of parsing, a date can be created from a 249 * week-based-year, week-of-week-based-year and day-of-week. 250 * See {@link #WEEK_OF_WEEK_BASED_YEAR} for details. 251 * <p> 252 * This unit is an immutable and thread-safe singleton. 253 */ 254 public static final TemporalField WEEK_BASED_YEAR = Field.WEEK_BASED_YEAR; 255 /** 256 * The unit that represents week-based-years for the purpose of addition and subtraction. 257 * <p> 258 * This allows a number of week-based-years to be added to, or subtracted from, a date. 259 * The unit is equal to either 52 or 53 weeks. 260 * The estimated duration of a week-based-year is the same as that of a standard ISO 261 * year at {@code 365.2425 Days}. 262 * <p> 263 * The rules for addition add the number of week-based-years to the existing value 264 * for the week-based-year field. If the resulting week-based-year only has 52 weeks, 265 * then the date will be in week 1 of the following week-based-year. 266 * <p> 267 * This unit is an immutable and thread-safe singleton. 268 */ 269 public static final TemporalUnit WEEK_BASED_YEARS = Unit.WEEK_BASED_YEARS; 270 /** 271 * Unit that represents the concept of a quarter-year. 272 * For the ISO calendar system, it is equal to 3 months. 273 * The estimated duration of a quarter-year is one quarter of {@code 365.2425 Days}. 274 * <p> 275 * This unit is an immutable and thread-safe singleton. 276 */ 277 public static final TemporalUnit QUARTER_YEARS = Unit.QUARTER_YEARS; 278 279 /** 280 * Restricted constructor. 281 */ 282 private IsoFields() { 283 throw new AssertionError("Not instantiable"); 284 } 285 286 //----------------------------------------------------------------------- 287 /** 288 * Implementation of the field. 289 */ 290 private static enum Field implements TemporalField { 291 DAY_OF_QUARTER { 292 @Override 293 public TemporalUnit getBaseUnit() { 294 return DAYS; 295 } 296 @Override 297 public TemporalUnit getRangeUnit() { 298 return QUARTER_YEARS; 299 } 300 @Override 301 public ValueRange range() { 302 return ValueRange.of(1, 90, 92); 303 } 304 @Override 305 public boolean isSupportedBy(TemporalAccessor temporal) { 306 return temporal.isSupported(DAY_OF_YEAR) && temporal.isSupported(MONTH_OF_YEAR) && 307 temporal.isSupported(YEAR) && isIso(temporal); 308 } 309 @Override 310 public ValueRange rangeRefinedBy(TemporalAccessor temporal) { 311 if (isSupportedBy(temporal) == false) { 312 throw new UnsupportedTemporalTypeException("Unsupported field: DayOfQuarter"); 313 } 314 long qoy = temporal.getLong(QUARTER_OF_YEAR); 315 if (qoy == 1) { 316 long year = temporal.getLong(YEAR); 317 return (IsoChronology.INSTANCE.isLeapYear(year) ? ValueRange.of(1, 91) : ValueRange.of(1, 90)); 318 } else if (qoy == 2) { 319 return ValueRange.of(1, 91); 320 } else if (qoy == 3 || qoy == 4) { 321 return ValueRange.of(1, 92); 322 } // else value not from 1 to 4, so drop through 323 return range(); 324 } 325 @Override 326 public long getFrom(TemporalAccessor temporal) { 327 if (isSupportedBy(temporal) == false) { 328 throw new UnsupportedTemporalTypeException("Unsupported field: DayOfQuarter"); 329 } 330 int doy = temporal.get(DAY_OF_YEAR); 331 int moy = temporal.get(MONTH_OF_YEAR); 332 long year = temporal.getLong(YEAR); 333 return doy - QUARTER_DAYS[((moy - 1) / 3) + (IsoChronology.INSTANCE.isLeapYear(year) ? 4 : 0)]; 334 } 335 @SuppressWarnings("unchecked") 336 @Override 337 public <R extends Temporal> R adjustInto(R temporal, long newValue) { 338 // calls getFrom() to check if supported 339 long curValue = getFrom(temporal); 340 range().checkValidValue(newValue, this); // leniently check from 1 to 92 TODO: check 341 return (R) temporal.with(DAY_OF_YEAR, temporal.getLong(DAY_OF_YEAR) + (newValue - curValue)); 342 } 343 @Override 344 public ChronoLocalDate resolve( 345 Map<TemporalField, Long> fieldValues, TemporalAccessor partialTemporal, ResolverStyle resolverStyle) { 346 Long yearLong = fieldValues.get(YEAR); 347 Long qoyLong = fieldValues.get(QUARTER_OF_YEAR); 348 if (yearLong == null || qoyLong == null) { 349 return null; 350 } 351 int y = YEAR.checkValidIntValue(yearLong); // always validate 352 long doq = fieldValues.get(DAY_OF_QUARTER); 353 ensureIso(partialTemporal); 354 LocalDate date; 355 if (resolverStyle == ResolverStyle.LENIENT) { 356 date = LocalDate.of(y, 1, 1).plusMonths(Math.multiplyExact(Math.subtractExact(qoyLong, 1), 3)); 357 doq = Math.subtractExact(doq, 1); 358 } else { 359 int qoy = QUARTER_OF_YEAR.range().checkValidIntValue(qoyLong, QUARTER_OF_YEAR); // validated 360 date = LocalDate.of(y, ((qoy - 1) * 3) + 1, 1); 361 if (doq < 1 || doq > 90) { 362 if (resolverStyle == ResolverStyle.STRICT) { 363 rangeRefinedBy(date).checkValidValue(doq, this); // only allow exact range 364 } else { // SMART 365 range().checkValidValue(doq, this); // allow 1-92 rolling into next quarter 366 } 367 } 368 doq--; 369 } 370 fieldValues.remove(this); 371 fieldValues.remove(YEAR); 372 fieldValues.remove(QUARTER_OF_YEAR); 373 return date.plusDays(doq); 374 } 375 @Override 376 public String toString() { 377 return "DayOfQuarter"; 378 } 379 }, 380 QUARTER_OF_YEAR { 381 @Override 382 public TemporalUnit getBaseUnit() { 383 return QUARTER_YEARS; 384 } 385 @Override 386 public TemporalUnit getRangeUnit() { 387 return YEARS; 388 } 389 @Override 390 public ValueRange range() { 391 return ValueRange.of(1, 4); 392 } 393 @Override 394 public boolean isSupportedBy(TemporalAccessor temporal) { 395 return temporal.isSupported(MONTH_OF_YEAR) && isIso(temporal); 396 } 397 @Override 398 public long getFrom(TemporalAccessor temporal) { 399 if (isSupportedBy(temporal) == false) { 400 throw new UnsupportedTemporalTypeException("Unsupported field: QuarterOfYear"); 401 } 402 long moy = temporal.getLong(MONTH_OF_YEAR); 403 return ((moy + 2) / 3); 404 } 405 @SuppressWarnings("unchecked") 406 @Override 407 public <R extends Temporal> R adjustInto(R temporal, long newValue) { 408 // calls getFrom() to check if supported 409 long curValue = getFrom(temporal); 410 range().checkValidValue(newValue, this); // strictly check from 1 to 4 411 return (R) temporal.with(MONTH_OF_YEAR, temporal.getLong(MONTH_OF_YEAR) + (newValue - curValue) * 3); 412 } 413 @Override 414 public String toString() { 415 return "QuarterOfYear"; 416 } 417 }, 418 WEEK_OF_WEEK_BASED_YEAR { 419 @Override 420 public String getDisplayName(Locale locale) { 421 Objects.requireNonNull(locale, "locale"); 422 LocaleResources lr = LocaleProviderAdapter.getResourceBundleBased() 423 .getLocaleResources(locale); 424 ResourceBundle rb = lr.getJavaTimeFormatData(); 425 return rb.containsKey("field.week") ? rb.getString("field.week") : toString(); 426 } 427 428 @Override 429 public TemporalUnit getBaseUnit() { 430 return WEEKS; 431 } 432 @Override 433 public TemporalUnit getRangeUnit() { 434 return WEEK_BASED_YEARS; 435 } 436 @Override 437 public ValueRange range() { 438 return ValueRange.of(1, 52, 53); 439 } 440 @Override 441 public boolean isSupportedBy(TemporalAccessor temporal) { 442 return temporal.isSupported(EPOCH_DAY) && isIso(temporal); 443 } 444 @Override 445 public ValueRange rangeRefinedBy(TemporalAccessor temporal) { 446 if (isSupportedBy(temporal) == false) { 447 throw new UnsupportedTemporalTypeException("Unsupported field: WeekOfWeekBasedYear"); 448 } 449 return getWeekRange(LocalDate.from(temporal)); 450 } 451 @Override 452 public long getFrom(TemporalAccessor temporal) { 453 if (isSupportedBy(temporal) == false) { 454 throw new UnsupportedTemporalTypeException("Unsupported field: WeekOfWeekBasedYear"); 455 } 456 return getWeek(LocalDate.from(temporal)); 457 } 458 @SuppressWarnings("unchecked") 459 @Override 460 public <R extends Temporal> R adjustInto(R temporal, long newValue) { 461 // calls getFrom() to check if supported 462 range().checkValidValue(newValue, this); // lenient range 463 return (R) temporal.plus(Math.subtractExact(newValue, getFrom(temporal)), WEEKS); 464 } 465 @Override 466 public ChronoLocalDate resolve( 467 Map<TemporalField, Long> fieldValues, TemporalAccessor partialTemporal, ResolverStyle resolverStyle) { 468 Long wbyLong = fieldValues.get(WEEK_BASED_YEAR); 469 Long dowLong = fieldValues.get(DAY_OF_WEEK); 470 if (wbyLong == null || dowLong == null) { 471 return null; 472 } 473 int wby = WEEK_BASED_YEAR.range().checkValidIntValue(wbyLong, WEEK_BASED_YEAR); // always validate 474 long wowby = fieldValues.get(WEEK_OF_WEEK_BASED_YEAR); 475 ensureIso(partialTemporal); 476 LocalDate date = LocalDate.of(wby, 1, 4); 477 if (resolverStyle == ResolverStyle.LENIENT) { 478 long dow = dowLong; // unvalidated 479 if (dow > 7) { 480 date = date.plusWeeks((dow - 1) / 7); 481 dow = ((dow - 1) % 7) + 1; 482 } else if (dow < 1) { 483 date = date.plusWeeks(Math.subtractExact(dow, 7) / 7); 484 dow = ((dow + 6) % 7) + 1; 485 } 486 date = date.plusWeeks(Math.subtractExact(wowby, 1)).with(DAY_OF_WEEK, dow); 487 } else { 488 int dow = DAY_OF_WEEK.checkValidIntValue(dowLong); // validated 489 if (wowby < 1 || wowby > 52) { 490 if (resolverStyle == ResolverStyle.STRICT) { 491 getWeekRange(date).checkValidValue(wowby, this); // only allow exact range 492 } else { // SMART 493 range().checkValidValue(wowby, this); // allow 1-53 rolling into next year 494 } 495 } 496 date = date.plusWeeks(wowby - 1).with(DAY_OF_WEEK, dow); 497 } 498 fieldValues.remove(this); 499 fieldValues.remove(WEEK_BASED_YEAR); 500 fieldValues.remove(DAY_OF_WEEK); 501 return date; 502 } 503 @Override 504 public String toString() { 505 return "WeekOfWeekBasedYear"; 506 } 507 }, 508 WEEK_BASED_YEAR { 509 @Override 510 public TemporalUnit getBaseUnit() { 511 return WEEK_BASED_YEARS; 512 } 513 @Override 514 public TemporalUnit getRangeUnit() { 515 return FOREVER; 516 } 517 @Override 518 public ValueRange range() { 519 return YEAR.range(); 520 } 521 @Override 522 public boolean isSupportedBy(TemporalAccessor temporal) { 523 return temporal.isSupported(EPOCH_DAY) && isIso(temporal); 524 } 525 @Override 526 public long getFrom(TemporalAccessor temporal) { 527 if (isSupportedBy(temporal) == false) { 528 throw new UnsupportedTemporalTypeException("Unsupported field: WeekBasedYear"); 529 } 530 return getWeekBasedYear(LocalDate.from(temporal)); 531 } 532 @SuppressWarnings("unchecked") 533 @Override 534 public <R extends Temporal> R adjustInto(R temporal, long newValue) { 535 if (isSupportedBy(temporal) == false) { 536 throw new UnsupportedTemporalTypeException("Unsupported field: WeekBasedYear"); 537 } 538 int newWby = range().checkValidIntValue(newValue, WEEK_BASED_YEAR); // strict check 539 LocalDate date = LocalDate.from(temporal); 540 int dow = date.get(DAY_OF_WEEK); 541 int week = getWeek(date); 542 if (week == 53 && getWeekRange(newWby) == 52) { 543 week = 52; 544 } 545 LocalDate resolved = LocalDate.of(newWby, 1, 4); // 4th is guaranteed to be in week one 546 int days = (dow - resolved.get(DAY_OF_WEEK)) + ((week - 1) * 7); 547 resolved = resolved.plusDays(days); 548 return (R) temporal.with(resolved); 549 } 550 @Override 551 public String toString() { 552 return "WeekBasedYear"; 553 } 554 }; 555 556 @Override 557 public boolean isDateBased() { 558 return true; 559 } 560 561 @Override 562 public boolean isTimeBased() { 563 return false; 564 } 565 566 @Override 567 public ValueRange rangeRefinedBy(TemporalAccessor temporal) { 568 return range(); 569 } 570 571 //------------------------------------------------------------------------- 572 private static final int[] QUARTER_DAYS = {0, 90, 181, 273, 0, 91, 182, 274}; 573 574 private static boolean isIso(TemporalAccessor temporal) { 575 return Chronology.from(temporal).equals(IsoChronology.INSTANCE); 576 } 577 578 private static void ensureIso(TemporalAccessor temporal) { 579 if (isIso(temporal) == false) { 580 throw new DateTimeException("Resolve requires IsoChronology"); 581 } 582 } 583 584 private static ValueRange getWeekRange(LocalDate date) { 585 int wby = getWeekBasedYear(date); 586 return ValueRange.of(1, getWeekRange(wby)); 587 } 588 589 private static int getWeekRange(int wby) { 590 LocalDate date = LocalDate.of(wby, 1, 1); 591 // 53 weeks if standard year starts on Thursday, or Wed in a leap year 592 if (date.getDayOfWeek() == THURSDAY || (date.getDayOfWeek() == WEDNESDAY && date.isLeapYear())) { 593 return 53; 594 } 595 return 52; 596 } 597 598 private static int getWeek(LocalDate date) { 599 int dow0 = date.getDayOfWeek().ordinal(); 600 int doy0 = date.getDayOfYear() - 1; 601 int doyThu0 = doy0 + (3 - dow0); // adjust to mid-week Thursday (which is 3 indexed from zero) 602 int alignedWeek = doyThu0 / 7; 603 int firstThuDoy0 = doyThu0 - (alignedWeek * 7); 604 int firstMonDoy0 = firstThuDoy0 - 3; 605 if (firstMonDoy0 < -3) { 606 firstMonDoy0 += 7; 607 } 608 if (doy0 < firstMonDoy0) { 609 return (int) getWeekRange(date.withDayOfYear(180).minusYears(1)).getMaximum(); 610 } 611 int week = ((doy0 - firstMonDoy0) / 7) + 1; 612 if (week == 53) { 613 if ((firstMonDoy0 == -3 || (firstMonDoy0 == -2 && date.isLeapYear())) == false) { 614 week = 1; 615 } 616 } 617 return week; 618 } 619 620 private static int getWeekBasedYear(LocalDate date) { 621 int year = date.getYear(); 622 int doy = date.getDayOfYear(); 623 if (doy <= 3) { 624 int dow = date.getDayOfWeek().ordinal(); 625 if (doy - dow < -2) { 626 year--; 627 } 628 } else if (doy >= 363) { 629 int dow = date.getDayOfWeek().ordinal(); 630 doy = doy - 363 - (date.isLeapYear() ? 1 : 0); 631 if (doy - dow >= 0) { 632 year++; 633 } 634 } 635 return year; 636 } 637 } 638 639 //----------------------------------------------------------------------- 640 /** 641 * Implementation of the unit. 642 */ 643 private static enum Unit implements TemporalUnit { 644 645 /** 646 * Unit that represents the concept of a week-based-year. 647 */ 648 WEEK_BASED_YEARS("WeekBasedYears", Duration.ofSeconds(31556952L)), 649 /** 650 * Unit that represents the concept of a quarter-year. 651 */ 652 QUARTER_YEARS("QuarterYears", Duration.ofSeconds(31556952L / 4)); 653 654 private final String name; 655 private final Duration duration; 656 657 private Unit(String name, Duration estimatedDuration) { 658 this.name = name; 659 this.duration = estimatedDuration; 660 } 661 662 @Override 663 public Duration getDuration() { 664 return duration; 665 } 666 667 @Override 668 public boolean isDurationEstimated() { 669 return true; 670 } 671 672 @Override 673 public boolean isDateBased() { 674 return true; 675 } 676 677 @Override 678 public boolean isTimeBased() { 679 return false; 680 } 681 682 @Override 683 public boolean isSupportedBy(Temporal temporal) { 684 return temporal.isSupported(EPOCH_DAY); 685 } 686 687 @SuppressWarnings("unchecked") 688 @Override 689 public <R extends Temporal> R addTo(R temporal, long amount) { 690 switch (this) { 691 case WEEK_BASED_YEARS: 692 return (R) temporal.with(WEEK_BASED_YEAR, 693 Math.addExact(temporal.get(WEEK_BASED_YEAR), amount)); 694 case QUARTER_YEARS: 695 // no overflow (256 is multiple of 4) 696 return (R) temporal.plus(amount / 256, YEARS) 697 .plus((amount % 256) * 3, MONTHS); 698 default: 699 throw new IllegalStateException("Unreachable"); 700 } 701 } 702 703 @Override 704 public long between(Temporal temporal1Inclusive, Temporal temporal2Exclusive) { 705 if (temporal1Inclusive.getClass() != temporal2Exclusive.getClass()) { 706 return temporal1Inclusive.until(temporal2Exclusive, this); 707 } 708 switch(this) { 709 case WEEK_BASED_YEARS: 710 return Math.subtractExact(temporal2Exclusive.getLong(WEEK_BASED_YEAR), 711 temporal1Inclusive.getLong(WEEK_BASED_YEAR)); 712 case QUARTER_YEARS: 713 return temporal1Inclusive.until(temporal2Exclusive, MONTHS) / 3; 714 default: 715 throw new IllegalStateException("Unreachable"); 716 } 717 } 718 719 @Override 720 public String toString() { 721 return name; 722 } 723 } 724 }