1 /* 2 * Copyright (c) 2012, 2015, 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 * 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 57 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 58 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 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.chrono; 63 64 import static java.time.temporal.ChronoField.EPOCH_DAY; 65 import static java.time.temporal.ChronoField.NANO_OF_DAY; 66 import static java.time.temporal.ChronoUnit.FOREVER; 67 import static java.time.temporal.ChronoUnit.NANOS; 68 69 import java.time.DateTimeException; 70 import java.time.Instant; 71 import java.time.LocalDateTime; 72 import java.time.LocalTime; 73 import java.time.ZoneId; 74 import java.time.ZoneOffset; 75 import java.time.format.DateTimeFormatter; 76 import java.time.temporal.ChronoField; 77 import java.time.temporal.ChronoUnit; 78 import java.time.temporal.Temporal; 79 import java.time.temporal.TemporalAccessor; 80 import java.time.temporal.TemporalAdjuster; 81 import java.time.temporal.TemporalAmount; 82 import java.time.temporal.TemporalField; 83 import java.time.temporal.TemporalQueries; 84 import java.time.temporal.TemporalQuery; 85 import java.time.temporal.TemporalUnit; 86 import java.time.zone.ZoneRules; 87 import java.util.Comparator; 88 import java.util.Objects; 89 90 /** 91 * A date-time without a time-zone in an arbitrary chronology, intended 92 * for advanced globalization use cases. 93 * <p> 94 * <b>Most applications should declare method signatures, fields and variables 95 * as {@link LocalDateTime}, not this interface.</b> 96 * <p> 97 * A {@code ChronoLocalDateTime} is the abstract representation of a local date-time 98 * where the {@code Chronology chronology}, or calendar system, is pluggable. 99 * The date-time is defined in terms of fields expressed by {@link TemporalField}, 100 * where most common implementations are defined in {@link ChronoField}. 101 * The chronology defines how the calendar system operates and the meaning of 102 * the standard fields. 103 * 104 * <h3>When to use this interface</h3> 105 * The design of the API encourages the use of {@code LocalDateTime} rather than this 106 * interface, even in the case where the application needs to deal with multiple 107 * calendar systems. The rationale for this is explored in detail in {@link ChronoLocalDate}. 108 * <p> 109 * Ensure that the discussion in {@code ChronoLocalDate} has been read and understood 110 * before using this interface. 111 * 112 * @implSpec 113 * This interface must be implemented with care to ensure other classes operate correctly. 114 * All implementations that can be instantiated must be final, immutable and thread-safe. 115 * Subclasses should be Serializable wherever possible. 116 * 117 * @param <D> the concrete type for the date of this date-time 118 * @since 1.8 119 */ 120 public interface ChronoLocalDateTime<D extends ChronoLocalDate> 121 extends Temporal, TemporalAdjuster, Comparable<ChronoLocalDateTime<?>> { 122 123 /** 124 * Gets a comparator that compares {@code ChronoLocalDateTime} in 125 * time-line order ignoring the chronology. 126 * <p> 127 * This comparator differs from the comparison in {@link #compareTo} in that it 128 * only compares the underlying date-time and not the chronology. 129 * This allows dates in different calendar systems to be compared based 130 * on the position of the date-time on the local time-line. 131 * The underlying comparison is equivalent to comparing the epoch-day and nano-of-day. 132 * 133 * @return a comparator that compares in time-line order ignoring the chronology 134 * @see #isAfter 135 * @see #isBefore 136 * @see #isEqual 137 */ timeLineOrder()138 static Comparator<ChronoLocalDateTime<?>> timeLineOrder() { 139 return AbstractChronology.DATE_TIME_ORDER; 140 } 141 142 //----------------------------------------------------------------------- 143 /** 144 * Obtains an instance of {@code ChronoLocalDateTime} from a temporal object. 145 * <p> 146 * This obtains a local date-time based on the specified temporal. 147 * A {@code TemporalAccessor} represents an arbitrary set of date and time information, 148 * which this factory converts to an instance of {@code ChronoLocalDateTime}. 149 * <p> 150 * The conversion extracts and combines the chronology and the date-time 151 * from the temporal object. The behavior is equivalent to using 152 * {@link Chronology#localDateTime(TemporalAccessor)} with the extracted chronology. 153 * Implementations are permitted to perform optimizations such as accessing 154 * those fields that are equivalent to the relevant objects. 155 * <p> 156 * This method matches the signature of the functional interface {@link TemporalQuery} 157 * allowing it to be used as a query via method reference, {@code ChronoLocalDateTime::from}. 158 * 159 * @param temporal the temporal object to convert, not null 160 * @return the date-time, not null 161 * @throws DateTimeException if unable to convert to a {@code ChronoLocalDateTime} 162 * @see Chronology#localDateTime(TemporalAccessor) 163 */ from(TemporalAccessor temporal)164 static ChronoLocalDateTime<?> from(TemporalAccessor temporal) { 165 if (temporal instanceof ChronoLocalDateTime) { 166 return (ChronoLocalDateTime<?>) temporal; 167 } 168 Objects.requireNonNull(temporal, "temporal"); 169 Chronology chrono = temporal.query(TemporalQueries.chronology()); 170 if (chrono == null) { 171 throw new DateTimeException("Unable to obtain ChronoLocalDateTime from TemporalAccessor: " + temporal.getClass()); 172 } 173 return chrono.localDateTime(temporal); 174 } 175 176 //----------------------------------------------------------------------- 177 /** 178 * Gets the chronology of this date-time. 179 * <p> 180 * The {@code Chronology} represents the calendar system in use. 181 * The era and other fields in {@link ChronoField} are defined by the chronology. 182 * 183 * @return the chronology, not null 184 */ getChronology()185 default Chronology getChronology() { 186 return toLocalDate().getChronology(); 187 } 188 189 /** 190 * Gets the local date part of this date-time. 191 * <p> 192 * This returns a local date with the same year, month and day 193 * as this date-time. 194 * 195 * @return the date part of this date-time, not null 196 */ toLocalDate()197 D toLocalDate() ; 198 199 /** 200 * Gets the local time part of this date-time. 201 * <p> 202 * This returns a local time with the same hour, minute, second and 203 * nanosecond as this date-time. 204 * 205 * @return the time part of this date-time, not null 206 */ toLocalTime()207 LocalTime toLocalTime(); 208 209 /** 210 * Checks if the specified field is supported. 211 * <p> 212 * This checks if the specified field can be queried on this date-time. 213 * If false, then calling the {@link #range(TemporalField) range}, 214 * {@link #get(TemporalField) get} and {@link #with(TemporalField, long)} 215 * methods will throw an exception. 216 * <p> 217 * The set of supported fields is defined by the chronology and normally includes 218 * all {@code ChronoField} date and time fields. 219 * <p> 220 * If the field is not a {@code ChronoField}, then the result of this method 221 * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)} 222 * passing {@code this} as the argument. 223 * Whether the field is supported is determined by the field. 224 * 225 * @param field the field to check, null returns false 226 * @return true if the field can be queried, false if not 227 */ 228 @Override isSupported(TemporalField field)229 boolean isSupported(TemporalField field); 230 231 /** 232 * Checks if the specified unit is supported. 233 * <p> 234 * This checks if the specified unit can be added to or subtracted from this date-time. 235 * If false, then calling the {@link #plus(long, TemporalUnit)} and 236 * {@link #minus(long, TemporalUnit) minus} methods will throw an exception. 237 * <p> 238 * The set of supported units is defined by the chronology and normally includes 239 * all {@code ChronoUnit} units except {@code FOREVER}. 240 * <p> 241 * If the unit is not a {@code ChronoUnit}, then the result of this method 242 * is obtained by invoking {@code TemporalUnit.isSupportedBy(Temporal)} 243 * passing {@code this} as the argument. 244 * Whether the unit is supported is determined by the unit. 245 * 246 * @param unit the unit to check, null returns false 247 * @return true if the unit can be added/subtracted, false if not 248 */ 249 @Override isSupported(TemporalUnit unit)250 default boolean isSupported(TemporalUnit unit) { 251 if (unit instanceof ChronoUnit) { 252 return unit != FOREVER; 253 } 254 return unit != null && unit.isSupportedBy(this); 255 } 256 257 //----------------------------------------------------------------------- 258 // override for covariant return type 259 /** 260 * {@inheritDoc} 261 * @throws DateTimeException {@inheritDoc} 262 * @throws ArithmeticException {@inheritDoc} 263 */ 264 @Override with(TemporalAdjuster adjuster)265 default ChronoLocalDateTime<D> with(TemporalAdjuster adjuster) { 266 return ChronoLocalDateTimeImpl.ensureValid(getChronology(), Temporal.super.with(adjuster)); 267 } 268 269 /** 270 * {@inheritDoc} 271 * @throws DateTimeException {@inheritDoc} 272 * @throws ArithmeticException {@inheritDoc} 273 */ 274 @Override with(TemporalField field, long newValue)275 ChronoLocalDateTime<D> with(TemporalField field, long newValue); 276 277 /** 278 * {@inheritDoc} 279 * @throws DateTimeException {@inheritDoc} 280 * @throws ArithmeticException {@inheritDoc} 281 */ 282 @Override plus(TemporalAmount amount)283 default ChronoLocalDateTime<D> plus(TemporalAmount amount) { 284 return ChronoLocalDateTimeImpl.ensureValid(getChronology(), Temporal.super.plus(amount)); 285 } 286 287 /** 288 * {@inheritDoc} 289 * @throws DateTimeException {@inheritDoc} 290 * @throws ArithmeticException {@inheritDoc} 291 */ 292 @Override plus(long amountToAdd, TemporalUnit unit)293 ChronoLocalDateTime<D> plus(long amountToAdd, TemporalUnit unit); 294 295 /** 296 * {@inheritDoc} 297 * @throws DateTimeException {@inheritDoc} 298 * @throws ArithmeticException {@inheritDoc} 299 */ 300 @Override minus(TemporalAmount amount)301 default ChronoLocalDateTime<D> minus(TemporalAmount amount) { 302 return ChronoLocalDateTimeImpl.ensureValid(getChronology(), Temporal.super.minus(amount)); 303 } 304 305 /** 306 * {@inheritDoc} 307 * @throws DateTimeException {@inheritDoc} 308 * @throws ArithmeticException {@inheritDoc} 309 */ 310 @Override minus(long amountToSubtract, TemporalUnit unit)311 default ChronoLocalDateTime<D> minus(long amountToSubtract, TemporalUnit unit) { 312 return ChronoLocalDateTimeImpl.ensureValid(getChronology(), Temporal.super.minus(amountToSubtract, unit)); 313 } 314 315 //----------------------------------------------------------------------- 316 /** 317 * Queries this date-time using the specified query. 318 * <p> 319 * This queries this date-time using the specified query strategy object. 320 * The {@code TemporalQuery} object defines the logic to be used to 321 * obtain the result. Read the documentation of the query to understand 322 * what the result of this method will be. 323 * <p> 324 * The result of this method is obtained by invoking the 325 * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the 326 * specified query passing {@code this} as the argument. 327 * 328 * @param <R> the type of the result 329 * @param query the query to invoke, not null 330 * @return the query result, null may be returned (defined by the query) 331 * @throws DateTimeException if unable to query (defined by the query) 332 * @throws ArithmeticException if numeric overflow occurs (defined by the query) 333 */ 334 @SuppressWarnings("unchecked") 335 @Override query(TemporalQuery<R> query)336 default <R> R query(TemporalQuery<R> query) { 337 if (query == TemporalQueries.zoneId() || query == TemporalQueries.zone() || query == TemporalQueries.offset()) { 338 return null; 339 } else if (query == TemporalQueries.localTime()) { 340 return (R) toLocalTime(); 341 } else if (query == TemporalQueries.chronology()) { 342 return (R) getChronology(); 343 } else if (query == TemporalQueries.precision()) { 344 return (R) NANOS; 345 } 346 // inline TemporalAccessor.super.query(query) as an optimization 347 // non-JDK classes are not permitted to make this optimization 348 return query.queryFrom(this); 349 } 350 351 /** 352 * Adjusts the specified temporal object to have the same date and time as this object. 353 * <p> 354 * This returns a temporal object of the same observable type as the input 355 * with the date and time changed to be the same as this. 356 * <p> 357 * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)} 358 * twice, passing {@link ChronoField#EPOCH_DAY} and 359 * {@link ChronoField#NANO_OF_DAY} as the fields. 360 * <p> 361 * In most cases, it is clearer to reverse the calling pattern by using 362 * {@link Temporal#with(TemporalAdjuster)}: 363 * <pre> 364 * // these two lines are equivalent, but the second approach is recommended 365 * temporal = thisLocalDateTime.adjustInto(temporal); 366 * temporal = temporal.with(thisLocalDateTime); 367 * </pre> 368 * <p> 369 * This instance is immutable and unaffected by this method call. 370 * 371 * @param temporal the target object to be adjusted, not null 372 * @return the adjusted object, not null 373 * @throws DateTimeException if unable to make the adjustment 374 * @throws ArithmeticException if numeric overflow occurs 375 */ 376 @Override adjustInto(Temporal temporal)377 default Temporal adjustInto(Temporal temporal) { 378 return temporal 379 .with(EPOCH_DAY, toLocalDate().toEpochDay()) 380 .with(NANO_OF_DAY, toLocalTime().toNanoOfDay()); 381 } 382 383 /** 384 * Formats this date-time using the specified formatter. 385 * <p> 386 * This date-time will be passed to the formatter to produce a string. 387 * <p> 388 * The default implementation must behave as follows: 389 * <pre> 390 * return formatter.format(this); 391 * </pre> 392 * 393 * @param formatter the formatter to use, not null 394 * @return the formatted date-time string, not null 395 * @throws DateTimeException if an error occurs during printing 396 */ format(DateTimeFormatter formatter)397 default String format(DateTimeFormatter formatter) { 398 Objects.requireNonNull(formatter, "formatter"); 399 return formatter.format(this); 400 } 401 402 //----------------------------------------------------------------------- 403 /** 404 * Combines this time with a time-zone to create a {@code ChronoZonedDateTime}. 405 * <p> 406 * This returns a {@code ChronoZonedDateTime} formed from this date-time at the 407 * specified time-zone. The result will match this date-time as closely as possible. 408 * Time-zone rules, such as daylight savings, mean that not every local date-time 409 * is valid for the specified zone, thus the local date-time may be adjusted. 410 * <p> 411 * The local date-time is resolved to a single instant on the time-line. 412 * This is achieved by finding a valid offset from UTC/Greenwich for the local 413 * date-time as defined by the {@link ZoneRules rules} of the zone ID. 414 *<p> 415 * In most cases, there is only one valid offset for a local date-time. 416 * In the case of an overlap, where clocks are set back, there are two valid offsets. 417 * This method uses the earlier offset typically corresponding to "summer". 418 * <p> 419 * In the case of a gap, where clocks jump forward, there is no valid offset. 420 * Instead, the local date-time is adjusted to be later by the length of the gap. 421 * For a typical one hour daylight savings change, the local date-time will be 422 * moved one hour later into the offset typically corresponding to "summer". 423 * <p> 424 * To obtain the later offset during an overlap, call 425 * {@link ChronoZonedDateTime#withLaterOffsetAtOverlap()} on the result of this method. 426 * 427 * @param zone the time-zone to use, not null 428 * @return the zoned date-time formed from this date-time, not null 429 */ atZone(ZoneId zone)430 ChronoZonedDateTime<D> atZone(ZoneId zone); 431 432 //----------------------------------------------------------------------- 433 /** 434 * Converts this date-time to an {@code Instant}. 435 * <p> 436 * This combines this local date-time and the specified offset to form 437 * an {@code Instant}. 438 * <p> 439 * This default implementation calculates from the epoch-day of the date and the 440 * second-of-day of the time. 441 * 442 * @param offset the offset to use for the conversion, not null 443 * @return an {@code Instant} representing the same instant, not null 444 */ toInstant(ZoneOffset offset)445 default Instant toInstant(ZoneOffset offset) { 446 return Instant.ofEpochSecond(toEpochSecond(offset), toLocalTime().getNano()); 447 } 448 449 /** 450 * Converts this date-time to the number of seconds from the epoch 451 * of 1970-01-01T00:00:00Z. 452 * <p> 453 * This combines this local date-time and the specified offset to calculate the 454 * epoch-second value, which is the number of elapsed seconds from 1970-01-01T00:00:00Z. 455 * Instants on the time-line after the epoch are positive, earlier are negative. 456 * <p> 457 * This default implementation calculates from the epoch-day of the date and the 458 * second-of-day of the time. 459 * 460 * @param offset the offset to use for the conversion, not null 461 * @return the number of seconds from the epoch of 1970-01-01T00:00:00Z 462 */ toEpochSecond(ZoneOffset offset)463 default long toEpochSecond(ZoneOffset offset) { 464 Objects.requireNonNull(offset, "offset"); 465 long epochDay = toLocalDate().toEpochDay(); 466 long secs = epochDay * 86400 + toLocalTime().toSecondOfDay(); 467 secs -= offset.getTotalSeconds(); 468 return secs; 469 } 470 471 //----------------------------------------------------------------------- 472 /** 473 * Compares this date-time to another date-time, including the chronology. 474 * <p> 475 * The comparison is based first on the underlying time-line date-time, then 476 * on the chronology. 477 * It is "consistent with equals", as defined by {@link Comparable}. 478 * <p> 479 * For example, the following is the comparator order: 480 * <ol> 481 * <li>{@code 2012-12-03T12:00 (ISO)}</li> 482 * <li>{@code 2012-12-04T12:00 (ISO)}</li> 483 * <li>{@code 2555-12-04T12:00 (ThaiBuddhist)}</li> 484 * <li>{@code 2012-12-05T12:00 (ISO)}</li> 485 * </ol> 486 * Values #2 and #3 represent the same date-time on the time-line. 487 * When two values represent the same date-time, the chronology ID is compared to distinguish them. 488 * This step is needed to make the ordering "consistent with equals". 489 * <p> 490 * If all the date-time objects being compared are in the same chronology, then the 491 * additional chronology stage is not required and only the local date-time is used. 492 * <p> 493 * This default implementation performs the comparison defined above. 494 * 495 * @param other the other date-time to compare to, not null 496 * @return the comparator value, negative if less, positive if greater 497 */ 498 @Override compareTo(ChronoLocalDateTime<?> other)499 default int compareTo(ChronoLocalDateTime<?> other) { 500 int cmp = toLocalDate().compareTo(other.toLocalDate()); 501 if (cmp == 0) { 502 cmp = toLocalTime().compareTo(other.toLocalTime()); 503 if (cmp == 0) { 504 cmp = getChronology().compareTo(other.getChronology()); 505 } 506 } 507 return cmp; 508 } 509 510 /** 511 * Checks if this date-time is after the specified date-time ignoring the chronology. 512 * <p> 513 * This method differs from the comparison in {@link #compareTo} in that it 514 * only compares the underlying date-time and not the chronology. 515 * This allows dates in different calendar systems to be compared based 516 * on the time-line position. 517 * <p> 518 * This default implementation performs the comparison based on the epoch-day 519 * and nano-of-day. 520 * 521 * @param other the other date-time to compare to, not null 522 * @return true if this is after the specified date-time 523 */ isAfter(ChronoLocalDateTime<?> other)524 default boolean isAfter(ChronoLocalDateTime<?> other) { 525 long thisEpDay = this.toLocalDate().toEpochDay(); 526 long otherEpDay = other.toLocalDate().toEpochDay(); 527 return thisEpDay > otherEpDay || 528 (thisEpDay == otherEpDay && this.toLocalTime().toNanoOfDay() > other.toLocalTime().toNanoOfDay()); 529 } 530 531 /** 532 * Checks if this date-time is before the specified date-time ignoring the chronology. 533 * <p> 534 * This method differs from the comparison in {@link #compareTo} in that it 535 * only compares the underlying date-time and not the chronology. 536 * This allows dates in different calendar systems to be compared based 537 * on the time-line position. 538 * <p> 539 * This default implementation performs the comparison based on the epoch-day 540 * and nano-of-day. 541 * 542 * @param other the other date-time to compare to, not null 543 * @return true if this is before the specified date-time 544 */ isBefore(ChronoLocalDateTime<?> other)545 default boolean isBefore(ChronoLocalDateTime<?> other) { 546 long thisEpDay = this.toLocalDate().toEpochDay(); 547 long otherEpDay = other.toLocalDate().toEpochDay(); 548 return thisEpDay < otherEpDay || 549 (thisEpDay == otherEpDay && this.toLocalTime().toNanoOfDay() < other.toLocalTime().toNanoOfDay()); 550 } 551 552 /** 553 * Checks if this date-time is equal to the specified date-time ignoring the chronology. 554 * <p> 555 * This method differs from the comparison in {@link #compareTo} in that it 556 * only compares the underlying date and time and not the chronology. 557 * This allows date-times in different calendar systems to be compared based 558 * on the time-line position. 559 * <p> 560 * This default implementation performs the comparison based on the epoch-day 561 * and nano-of-day. 562 * 563 * @param other the other date-time to compare to, not null 564 * @return true if the underlying date-time is equal to the specified date-time on the timeline 565 */ isEqual(ChronoLocalDateTime<?> other)566 default boolean isEqual(ChronoLocalDateTime<?> other) { 567 // Do the time check first, it is cheaper than computing EPOCH day. 568 return this.toLocalTime().toNanoOfDay() == other.toLocalTime().toNanoOfDay() && 569 this.toLocalDate().toEpochDay() == other.toLocalDate().toEpochDay(); 570 } 571 572 /** 573 * Checks if this date-time is equal to another date-time, including the chronology. 574 * <p> 575 * Compares this date-time with another ensuring that the date-time and chronology are the same. 576 * 577 * @param obj the object to check, null returns false 578 * @return true if this is equal to the other date 579 */ 580 @Override equals(Object obj)581 boolean equals(Object obj); 582 583 /** 584 * A hash code for this date-time. 585 * 586 * @return a suitable hash code 587 */ 588 @Override hashCode()589 int hashCode(); 590 591 //----------------------------------------------------------------------- 592 /** 593 * Outputs this date-time as a {@code String}. 594 * <p> 595 * The output will include the full local date-time. 596 * 597 * @return a string representation of this date-time, not null 598 */ 599 @Override toString()600 String toString(); 601 602 } 603