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  11  * This code is distributed in the hope that it will be useful, but WITHOUT
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  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).
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  17  * You should have received a copy of the GNU General Public License version
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  25 
  26 /*
  27  * This file is available under and governed by the GNU General Public
  28  * License version 2 only, as published by the Free Software Foundation.
  29  * However, the following notice accompanied the original version of this
  30  * file:
  31  *
  32  * Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos
  33  *
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions are met:
  38  *
  39  *  * Redistributions of source code must retain the above copyright notice,
  40  *    this list of conditions and the following disclaimer.
  41  *
  42  *  * Redistributions in binary form must reproduce the above copyright notice,
  43  *    this list of conditions and the following disclaimer in the documentation
  44  *    and/or other materials provided with the distribution.
  45  *
  46  *  * Neither the name of JSR-310 nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  54  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  55  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  56  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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  59  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  60  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  */
  62 package java.time.temporal;
  63 
  64 import static java.time.temporal.ChronoField.DAY_OF_MONTH;
  65 import static java.time.temporal.ChronoField.DAY_OF_WEEK;
  66 import static java.time.temporal.ChronoField.DAY_OF_YEAR;
  67 import static java.time.temporal.ChronoUnit.DAYS;
  68 import static java.time.temporal.ChronoUnit.MONTHS;
  69 import static java.time.temporal.ChronoUnit.YEARS;
  70 
  71 import java.time.DayOfWeek;
  72 import java.util.Objects;
  73 
  74 /**
  75  * Common implementations of {@code TemporalAdjuster}.
  76  * <p>
  77  * This class provides common implementations of {@link TemporalAdjuster}.
  78  * They are especially useful to document the intent of business logic and
  79  * often link well to requirements.
  80  * For example, these two pieces of code do the same thing, but the second
  81  * one is clearer (assuming that there is a static import of this class):
  82  * <pre>
  83  *  // direct manipulation
  84  *  date.withDayOfMonth(1).plusMonths(1).minusDays(1);
  85  *  // use of an adjuster from this class
  86  *  date.with(lastDayOfMonth());
  87  * </pre>
  88  * There are two equivalent ways of using a {@code TemporalAdjuster}.
  89  * The first is to invoke the method on the interface directly.
  90  * The second is to use {@link Temporal#with(TemporalAdjuster)}:
  91  * <pre>
  92  *   // these two lines are equivalent, but the second approach is recommended
  93  *   dateTime = adjuster.adjustInto(dateTime);
  94  *   dateTime = dateTime.with(adjuster);
  95  * </pre>
  96  * It is recommended to use the second approach, {@code with(TemporalAdjuster)},
  97  * as it is a lot clearer to read in code.
  98  *
  99  * <h3>Specification for implementors</h3>
 100  * This is a thread-safe utility class.
 101  * All returned adjusters are immutable and thread-safe.
 102  *
 103  * @since 1.8
 104  */
 105 public final class Adjusters {
 106 
 107     /**
 108      * Private constructor since this is a utility class.
 109      */
 110     private Adjusters() {
 111     }
 112 
 113     //-----------------------------------------------------------------------
 114     /**
 115      * Returns the "first day of month" adjuster, which returns a new date set to
 116      * the first day of the current month.
 117      * <p>
 118      * The ISO calendar system behaves as follows:<br>
 119      * The input 2011-01-15 will return 2011-01-01.<br>
 120      * The input 2011-02-15 will return 2011-02-01.
 121      * <p>
 122      * The behavior is suitable for use with most calendar systems.
 123      * It is equivalent to:
 124      * <pre>
 125      *  temporal.with(DAY_OF_MONTH, 1);
 126      * </pre>
 127      *
 128      * @return the first day-of-month adjuster, not null
 129      */
 130     public static TemporalAdjuster firstDayOfMonth() {
 131         return Impl.FIRST_DAY_OF_MONTH;
 132     }
 133 
 134     /**
 135      * Returns the "last day of month" adjuster, which returns a new date set to
 136      * the last day of the current month.
 137      * <p>
 138      * The ISO calendar system behaves as follows:<br>
 139      * The input 2011-01-15 will return 2011-01-31.<br>
 140      * The input 2011-02-15 will return 2011-02-28.<br>
 141      * The input 2012-02-15 will return 2012-02-29 (leap year).<br>
 142      * The input 2011-04-15 will return 2011-04-30.
 143      * <p>
 144      * The behavior is suitable for use with most calendar systems.
 145      * It is equivalent to:
 146      * <pre>
 147      *  long lastDay = temporal.range(DAY_OF_MONTH).getMaximum();
 148      *  temporal.with(DAY_OF_MONTH, lastDay);
 149      * </pre>
 150      *
 151      * @return the last day-of-month adjuster, not null
 152      */
 153     public static TemporalAdjuster lastDayOfMonth() {
 154         return Impl.LAST_DAY_OF_MONTH;
 155     }
 156 
 157     /**
 158      * Returns the "first day of next month" adjuster, which returns a new date set to
 159      * the first day of the next month.
 160      * <p>
 161      * The ISO calendar system behaves as follows:<br>
 162      * The input 2011-01-15 will return 2011-02-01.<br>
 163      * The input 2011-02-15 will return 2011-03-01.
 164      * <p>
 165      * The behavior is suitable for use with most calendar systems.
 166      * It is equivalent to:
 167      * <pre>
 168      *  temporal.with(DAY_OF_MONTH, 1).plus(1, MONTHS);
 169      * </pre>
 170      *
 171      * @return the first day of next month adjuster, not null
 172      */
 173     public static TemporalAdjuster firstDayOfNextMonth() {
 174         return Impl.FIRST_DAY_OF_NEXT_MONTH;
 175     }
 176 
 177     //-----------------------------------------------------------------------
 178     /**
 179      * Returns the "first day of year" adjuster, which returns a new date set to
 180      * the first day of the current year.
 181      * <p>
 182      * The ISO calendar system behaves as follows:<br>
 183      * The input 2011-01-15 will return 2011-01-01.<br>
 184      * The input 2011-02-15 will return 2011-01-01.<br>
 185      * <p>
 186      * The behavior is suitable for use with most calendar systems.
 187      * It is equivalent to:
 188      * <pre>
 189      *  temporal.with(DAY_OF_YEAR, 1);
 190      * </pre>
 191      *
 192      * @return the first day-of-year adjuster, not null
 193      */
 194     public static TemporalAdjuster firstDayOfYear() {
 195         return Impl.FIRST_DAY_OF_YEAR;
 196     }
 197 
 198     /**
 199      * Returns the "last day of year" adjuster, which returns a new date set to
 200      * the last day of the current year.
 201      * <p>
 202      * The ISO calendar system behaves as follows:<br>
 203      * The input 2011-01-15 will return 2011-12-31.<br>
 204      * The input 2011-02-15 will return 2011-12-31.<br>
 205      * <p>
 206      * The behavior is suitable for use with most calendar systems.
 207      * It is equivalent to:
 208      * <pre>
 209      *  long lastDay = temporal.range(DAY_OF_YEAR).getMaximum();
 210      *  temporal.with(DAY_OF_YEAR, lastDay);
 211      * </pre>
 212      *
 213      * @return the last day-of-year adjuster, not null
 214      */
 215     public static TemporalAdjuster lastDayOfYear() {
 216         return Impl.LAST_DAY_OF_YEAR;
 217     }
 218 
 219     /**
 220      * Returns the "first day of next year" adjuster, which returns a new date set to
 221      * the first day of the next year.
 222      * <p>
 223      * The ISO calendar system behaves as follows:<br>
 224      * The input 2011-01-15 will return 2012-01-01.
 225      * <p>
 226      * The behavior is suitable for use with most calendar systems.
 227      * It is equivalent to:
 228      * <pre>
 229      *  temporal.with(DAY_OF_YEAR, 1).plus(1, YEARS);
 230      * </pre>
 231      *
 232      * @return the first day of next month adjuster, not null
 233      */
 234     public static TemporalAdjuster firstDayOfNextYear() {
 235         return Impl.FIRST_DAY_OF_NEXT_YEAR;
 236     }
 237 
 238     //-----------------------------------------------------------------------
 239     /**
 240      * Enum implementing the adjusters.
 241      */
 242     private static class Impl implements TemporalAdjuster {
 243         /** First day of month adjuster. */
 244         private static final Impl FIRST_DAY_OF_MONTH = new Impl(0);
 245         /** Last day of month adjuster. */
 246         private static final Impl LAST_DAY_OF_MONTH = new Impl(1);
 247         /** First day of next month adjuster. */
 248         private static final Impl FIRST_DAY_OF_NEXT_MONTH = new Impl(2);
 249         /** First day of year adjuster. */
 250         private static final Impl FIRST_DAY_OF_YEAR = new Impl(3);
 251         /** Last day of year adjuster. */
 252         private static final Impl LAST_DAY_OF_YEAR = new Impl(4);
 253         /** First day of next month adjuster. */
 254         private static final Impl FIRST_DAY_OF_NEXT_YEAR = new Impl(5);
 255         /** The ordinal. */
 256         private final int ordinal;
 257         private Impl(int ordinal) {
 258             this.ordinal = ordinal;
 259         }
 260         @Override
 261         public Temporal adjustInto(Temporal temporal) {
 262             switch (ordinal) {
 263                 case 0: return temporal.with(DAY_OF_MONTH, 1);
 264                 case 1: return temporal.with(DAY_OF_MONTH, temporal.range(DAY_OF_MONTH).getMaximum());
 265                 case 2: return temporal.with(DAY_OF_MONTH, 1).plus(1, MONTHS);
 266                 case 3: return temporal.with(DAY_OF_YEAR, 1);
 267                 case 4: return temporal.with(DAY_OF_YEAR, temporal.range(DAY_OF_YEAR).getMaximum());
 268                 case 5: return temporal.with(DAY_OF_YEAR, 1).plus(1, YEARS);
 269             }
 270             throw new IllegalStateException("Unreachable");
 271         }
 272     }
 273 
 274     //-----------------------------------------------------------------------
 275     /**
 276      * Returns the first in month adjuster, which returns a new date
 277      * in the same month with the first matching day-of-week.
 278      * This is used for expressions like 'first Tuesday in March'.
 279      * <p>
 280      * The ISO calendar system behaves as follows:<br>
 281      * The input 2011-12-15 for (MONDAY) will return 2011-12-05.<br>
 282      * The input 2011-12-15 for (FRIDAY) will return 2011-12-02.<br>
 283      * <p>
 284      * The behavior is suitable for use with most calendar systems.
 285      * It uses the {@code DAY_OF_WEEK} and {@code DAY_OF_MONTH} fields
 286      * and the {@code DAYS} unit, and assumes a seven day week.
 287      *
 288      * @param dayOfWeek  the day-of-week, not null
 289      * @return the first in month adjuster, not null
 290      */
 291     public static TemporalAdjuster firstInMonth(DayOfWeek dayOfWeek) {
 292         Objects.requireNonNull(dayOfWeek, "dayOfWeek");
 293         return new DayOfWeekInMonth(1, dayOfWeek);
 294     }
 295 
 296     /**
 297      * Returns the last in month adjuster, which returns a new date
 298      * in the same month with the last matching day-of-week.
 299      * This is used for expressions like 'last Tuesday in March'.
 300      * <p>
 301      * The ISO calendar system behaves as follows:<br>
 302      * The input 2011-12-15 for (MONDAY) will return 2011-12-26.<br>
 303      * The input 2011-12-15 for (FRIDAY) will return 2011-12-30.<br>
 304      * <p>
 305      * The behavior is suitable for use with most calendar systems.
 306      * It uses the {@code DAY_OF_WEEK} and {@code DAY_OF_MONTH} fields
 307      * and the {@code DAYS} unit, and assumes a seven day week.
 308      *
 309      * @param dayOfWeek  the day-of-week, not null
 310      * @return the first in month adjuster, not null
 311      */
 312     public static TemporalAdjuster lastInMonth(DayOfWeek dayOfWeek) {
 313         Objects.requireNonNull(dayOfWeek, "dayOfWeek");
 314         return new DayOfWeekInMonth(-1, dayOfWeek);
 315     }
 316 
 317     /**
 318      * Returns the day-of-week in month adjuster, which returns a new date
 319      * in the same month with the ordinal day-of-week.
 320      * This is used for expressions like the 'second Tuesday in March'.
 321      * <p>
 322      * The ISO calendar system behaves as follows:<br>
 323      * The input 2011-12-15 for (1,TUESDAY) will return 2011-12-06.<br>
 324      * The input 2011-12-15 for (2,TUESDAY) will return 2011-12-13.<br>
 325      * The input 2011-12-15 for (3,TUESDAY) will return 2011-12-20.<br>
 326      * The input 2011-12-15 for (4,TUESDAY) will return 2011-12-27.<br>
 327      * The input 2011-12-15 for (5,TUESDAY) will return 2012-01-03.<br>
 328      * The input 2011-12-15 for (-1,TUESDAY) will return 2011-12-27 (last in month).<br>
 329      * The input 2011-12-15 for (-4,TUESDAY) will return 2011-12-06 (3 weeks before last in month).<br>
 330      * The input 2011-12-15 for (-5,TUESDAY) will return 2011-11-29 (4 weeks before last in month).<br>
 331      * The input 2011-12-15 for (0,TUESDAY) will return 2011-11-29 (last in previous month).<br>
 332      * <p>
 333      * For a positive or zero ordinal, the algorithm is equivalent to finding the first
 334      * day-of-week that matches within the month and then adding a number of weeks to it.
 335      * For a negative ordinal, the algorithm is equivalent to finding the last
 336      * day-of-week that matches within the month and then subtracting a number of weeks to it.
 337      * The ordinal number of weeks is not validated and is interpreted leniently
 338      * according to this algorithm. This definition means that an ordinal of zero finds
 339      * the last matching day-of-week in the previous month.
 340      * <p>
 341      * The behavior is suitable for use with most calendar systems.
 342      * It uses the {@code DAY_OF_WEEK} and {@code DAY_OF_MONTH} fields
 343      * and the {@code DAYS} unit, and assumes a seven day week.
 344      *
 345      * @param ordinal  the week within the month, unbound but typically from -5 to 5
 346      * @param dayOfWeek  the day-of-week, not null
 347      * @return the day-of-week in month adjuster, not null
 348      * @throws IllegalArgumentException if the ordinal is invalid
 349      */
 350     public static TemporalAdjuster dayOfWeekInMonth(int ordinal, DayOfWeek dayOfWeek) {
 351         Objects.requireNonNull(dayOfWeek, "dayOfWeek");
 352         return new DayOfWeekInMonth(ordinal, dayOfWeek);
 353     }
 354 
 355     /**
 356      * Class implementing day-of-week in month adjuster.
 357      */
 358     private static final class DayOfWeekInMonth implements TemporalAdjuster {
 359         /** The ordinal. */
 360         private final int ordinal;
 361         /** The day-of-week value, from 1 to 7. */
 362         private final int dowValue;
 363 
 364         private DayOfWeekInMonth(int ordinal, DayOfWeek dow) {
 365             super();
 366             this.ordinal = ordinal;
 367             this.dowValue = dow.getValue();
 368         }
 369         @Override
 370         public Temporal adjustInto(Temporal temporal) {
 371             if (ordinal >= 0) {
 372                 Temporal temp = temporal.with(DAY_OF_MONTH, 1);
 373                 int curDow = temp.get(DAY_OF_WEEK);
 374                 int dowDiff = (dowValue - curDow + 7) % 7;
 375                 dowDiff += (ordinal - 1L) * 7L;  // safe from overflow
 376                 return temp.plus(dowDiff, DAYS);
 377             } else {
 378                 Temporal temp = temporal.with(DAY_OF_MONTH, temporal.range(DAY_OF_MONTH).getMaximum());
 379                 int curDow = temp.get(DAY_OF_WEEK);
 380                 int daysDiff = dowValue - curDow;
 381                 daysDiff = (daysDiff == 0 ? 0 : (daysDiff > 0 ? daysDiff - 7 : daysDiff));
 382                 daysDiff -= (-ordinal - 1L) * 7L;  // safe from overflow
 383                 return temp.plus(daysDiff, DAYS);
 384             }
 385         }
 386     }
 387 
 388     //-----------------------------------------------------------------------
 389     /**
 390      * Returns the next day-of-week adjuster, which adjusts the date to the
 391      * first occurrence of the specified day-of-week after the date being adjusted.
 392      * <p>
 393      * The ISO calendar system behaves as follows:<br>
 394      * The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-17 (two days later).<br>
 395      * The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-19 (four days later).<br>
 396      * The input 2011-01-15 (a Saturday) for parameter (SATURDAY) will return 2011-01-22 (seven days later).
 397      * <p>
 398      * The behavior is suitable for use with most calendar systems.
 399      * It uses the {@code DAY_OF_WEEK} field and the {@code DAYS} unit,
 400      * and assumes a seven day week.
 401      *
 402      * @param dayOfWeek  the day-of-week to move the date to, not null
 403      * @return the next day-of-week adjuster, not null
 404      */
 405     public static TemporalAdjuster next(DayOfWeek dayOfWeek) {
 406         return new RelativeDayOfWeek(2, dayOfWeek);
 407     }
 408 
 409     /**
 410      * Returns the next-or-same day-of-week adjuster, which adjusts the date to the
 411      * first occurrence of the specified day-of-week after the date being adjusted
 412      * unless it is already on that day in which case the same object is returned.
 413      * <p>
 414      * The ISO calendar system behaves as follows:<br>
 415      * The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-17 (two days later).<br>
 416      * The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-19 (four days later).<br>
 417      * The input 2011-01-15 (a Saturday) for parameter (SATURDAY) will return 2011-01-15 (same as input).
 418      * <p>
 419      * The behavior is suitable for use with most calendar systems.
 420      * It uses the {@code DAY_OF_WEEK} field and the {@code DAYS} unit,
 421      * and assumes a seven day week.
 422      *
 423      * @param dayOfWeek  the day-of-week to check for or move the date to, not null
 424      * @return the next-or-same day-of-week adjuster, not null
 425      */
 426     public static TemporalAdjuster nextOrSame(DayOfWeek dayOfWeek) {
 427         return new RelativeDayOfWeek(0, dayOfWeek);
 428     }
 429 
 430     /**
 431      * Returns the previous day-of-week adjuster, which adjusts the date to the
 432      * first occurrence of the specified day-of-week before the date being adjusted.
 433      * <p>
 434      * The ISO calendar system behaves as follows:<br>
 435      * The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-10 (five days earlier).<br>
 436      * The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-12 (three days earlier).<br>
 437      * The input 2011-01-15 (a Saturday) for parameter (SATURDAY) will return 2011-01-08 (seven days earlier).
 438      * <p>
 439      * The behavior is suitable for use with most calendar systems.
 440      * It uses the {@code DAY_OF_WEEK} field and the {@code DAYS} unit,
 441      * and assumes a seven day week.
 442      *
 443      * @param dayOfWeek  the day-of-week to move the date to, not null
 444      * @return the previous day-of-week adjuster, not null
 445      */
 446     public static TemporalAdjuster previous(DayOfWeek dayOfWeek) {
 447         return new RelativeDayOfWeek(3, dayOfWeek);
 448     }
 449 
 450     /**
 451      * Returns the previous-or-same day-of-week adjuster, which adjusts the date to the
 452      * first occurrence of the specified day-of-week before the date being adjusted
 453      * unless it is already on that day in which case the same object is returned.
 454      * <p>
 455      * The ISO calendar system behaves as follows:<br>
 456      * The input 2011-01-15 (a Saturday) for parameter (MONDAY) will return 2011-01-10 (five days earlier).<br>
 457      * The input 2011-01-15 (a Saturday) for parameter (WEDNESDAY) will return 2011-01-12 (three days earlier).<br>
 458      * The input 2011-01-15 (a Saturday) for parameter (SATURDAY) will return 2011-01-15 (same as input).
 459      * <p>
 460      * The behavior is suitable for use with most calendar systems.
 461      * It uses the {@code DAY_OF_WEEK} field and the {@code DAYS} unit,
 462      * and assumes a seven day week.
 463      *
 464      * @param dayOfWeek  the day-of-week to check for or move the date to, not null
 465      * @return the previous-or-same day-of-week adjuster, not null
 466      */
 467     public static TemporalAdjuster previousOrSame(DayOfWeek dayOfWeek) {
 468         return new RelativeDayOfWeek(1, dayOfWeek);
 469     }
 470 
 471     /**
 472      * Implementation of next, previous or current day-of-week.
 473      */
 474     private static final class RelativeDayOfWeek implements TemporalAdjuster {
 475         /** Whether the current date is a valid answer. */
 476         private final int relative;
 477         /** The day-of-week value, from 1 to 7. */
 478         private final int dowValue;
 479 
 480         private RelativeDayOfWeek(int relative, DayOfWeek dayOfWeek) {
 481             Objects.requireNonNull(dayOfWeek, "dayOfWeek");
 482             this.relative = relative;
 483             this.dowValue = dayOfWeek.getValue();
 484         }
 485 
 486         @Override
 487         public Temporal adjustInto(Temporal temporal) {
 488             int calDow = temporal.get(DAY_OF_WEEK);
 489             if (relative < 2 && calDow == dowValue) {
 490                 return temporal;
 491             }
 492             if ((relative & 1) == 0) {
 493                 int daysDiff = calDow - dowValue;
 494                 return temporal.plus(daysDiff >= 0 ? 7 - daysDiff : -daysDiff, DAYS);
 495             } else {
 496                 int daysDiff = dowValue - calDow;
 497                 return temporal.minus(daysDiff >= 0 ? 7 - daysDiff : -daysDiff, DAYS);
 498             }
 499         }
 500     }
 501 
 502 }