| 1 | /* |
| 2 | * Copyright 2001-2006 Stephen Colebourne |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.joda.time; |
| 17 | |
| 18 | import org.joda.time.base.BaseSingleFieldPeriod; |
| 19 | import org.joda.time.field.FieldUtils; |
| 20 | import org.joda.time.format.ISOPeriodFormat; |
| 21 | import org.joda.time.format.PeriodFormatter; |
| 22 | |
| 23 | /** |
| 24 | * An immutable time period representing a number of days. |
| 25 | * <p> |
| 26 | * <code>Days</code> is an immutable period that can only store days. |
| 27 | * It does not store years, months or hours for example. As such it is a |
| 28 | * type-safe way of representing a number of days in an application. |
| 29 | * <p> |
| 30 | * The number of days is set in the constructor, and may be queried using |
| 31 | * <code>getDays()</code>. Basic mathematical operations are provided - |
| 32 | * <code>plus()</code>, <code>minus()</code>, <code>multipliedBy()</code> and |
| 33 | * <code>dividedBy()</code>. |
| 34 | * <p> |
| 35 | * <code>Days</code> is thread-safe and immutable. |
| 36 | * |
| 37 | * @author Stephen Colebourne |
| 38 | * @since 1.4 |
| 39 | */ |
| 40 | public final class Days extends BaseSingleFieldPeriod { |
| 41 | |
| 42 | /** Constant representing zero days. */ |
| 43 | public static final Days ZERO = new Days(0); |
| 44 | /** Constant representing one day. */ |
| 45 | public static final Days ONE = new Days(1); |
| 46 | /** Constant representing two days. */ |
| 47 | public static final Days TWO = new Days(2); |
| 48 | /** Constant representing three days. */ |
| 49 | public static final Days THREE = new Days(3); |
| 50 | /** Constant representing four days. */ |
| 51 | public static final Days FOUR = new Days(4); |
| 52 | /** Constant representing five days. */ |
| 53 | public static final Days FIVE = new Days(5); |
| 54 | /** Constant representing six days. */ |
| 55 | public static final Days SIX = new Days(6); |
| 56 | /** Constant representing seven days. */ |
| 57 | public static final Days SEVEN = new Days(7); |
| 58 | /** Constant representing the maximum number of days that can be stored in this object. */ |
| 59 | public static final Days MAX_VALUE = new Days(Integer.MAX_VALUE); |
| 60 | /** Constant representing the minimum number of days that can be stored in this object. */ |
| 61 | public static final Days MIN_VALUE = new Days(Integer.MIN_VALUE); |
| 62 | |
| 63 | /** The paser to use for this class. */ |
| 64 | private static final PeriodFormatter PARSER = ISOPeriodFormat.standard().withParseType(PeriodType.days()); |
| 65 | /** Serialization version. */ |
| 66 | private static final long serialVersionUID = 87525275727380865L; |
| 67 | |
| 68 | //----------------------------------------------------------------------- |
| 69 | /** |
| 70 | * Obtains an instance of <code>Days</code> that may be cached. |
| 71 | * <code>Days</code> is immutable, so instances can be cached and shared. |
| 72 | * This factory method provides access to shared instances. |
| 73 | * |
| 74 | * @param days the number of days to obtain an instance for |
| 75 | * @return the instance of Days |
| 76 | */ |
| 77 | public static Days days(int days) { |
| 78 | switch (days) { |
| 79 | case 0: |
| 80 | return ZERO; |
| 81 | case 1: |
| 82 | return ONE; |
| 83 | case 2: |
| 84 | return TWO; |
| 85 | case 3: |
| 86 | return THREE; |
| 87 | case 4: |
| 88 | return FOUR; |
| 89 | case 5: |
| 90 | return FIVE; |
| 91 | case 6: |
| 92 | return SIX; |
| 93 | case 7: |
| 94 | return SEVEN; |
| 95 | case Integer.MAX_VALUE: |
| 96 | return MAX_VALUE; |
| 97 | case Integer.MIN_VALUE: |
| 98 | return MIN_VALUE; |
| 99 | default: |
| 100 | return new Days(days); |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | //----------------------------------------------------------------------- |
| 105 | /** |
| 106 | * Creates a <code>Days</code> representing the number of whole days |
| 107 | * between the two specified datetimes. This method corectly handles |
| 108 | * any daylight savings time changes that may occur during the interval. |
| 109 | * |
| 110 | * @param start the start instant, must not be null |
| 111 | * @param end the end instant, must not be null |
| 112 | * @return the period in days |
| 113 | * @throws IllegalArgumentException if the instants are null or invalid |
| 114 | */ |
| 115 | public static Days daysBetween(ReadableInstant start, ReadableInstant end) { |
| 116 | int amount = BaseSingleFieldPeriod.between(start, end, DurationFieldType.days()); |
| 117 | return Days.days(amount); |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * Creates a <code>Days</code> representing the number of whole days |
| 122 | * between the two specified partial datetimes. |
| 123 | * <p> |
| 124 | * The two partials must contain the same fields, for example you can specify |
| 125 | * two <code>LocalDate</code> objects. |
| 126 | * |
| 127 | * @param start the start partial date, must not be null |
| 128 | * @param end the end partial date, must not be null |
| 129 | * @return the period in days |
| 130 | * @throws IllegalArgumentException if the partials are null or invalid |
| 131 | */ |
| 132 | public static Days daysBetween(ReadablePartial start, ReadablePartial end) { |
| 133 | if (start instanceof LocalDate && end instanceof LocalDate) { |
| 134 | Chronology chrono = DateTimeUtils.getChronology(start.getChronology()); |
| 135 | int days = chrono.days().getDifference( |
| 136 | ((LocalDate) end).getLocalMillis(), ((LocalDate) start).getLocalMillis()); |
| 137 | return Days.days(days); |
| 138 | } |
| 139 | int amount = BaseSingleFieldPeriod.between(start, end, ZERO); |
| 140 | return Days.days(amount); |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * Creates a <code>Days</code> representing the number of whole days |
| 145 | * in the specified interval. This method corectly handles any daylight |
| 146 | * savings time changes that may occur during the interval. |
| 147 | * |
| 148 | * @param interval the interval to extract days from, null returns zero |
| 149 | * @return the period in days |
| 150 | * @throws IllegalArgumentException if the partials are null or invalid |
| 151 | */ |
| 152 | public static Days daysIn(ReadableInterval interval) { |
| 153 | if (interval == null) { |
| 154 | return Days.ZERO; |
| 155 | } |
| 156 | int amount = BaseSingleFieldPeriod.between(interval.getStart(), interval.getEnd(), DurationFieldType.days()); |
| 157 | return Days.days(amount); |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * Creates a new <code>Days</code> representing the number of complete |
| 162 | * standard length days in the specified period. |
| 163 | * <p> |
| 164 | * This factory method converts all fields from the period to hours using standardised |
| 165 | * durations for each field. Only those fields which have a precise duration in |
| 166 | * the ISO UTC chronology can be converted. |
| 167 | * <ul> |
| 168 | * <li>One week consists of 7 days. |
| 169 | * <li>One day consists of 24 hours. |
| 170 | * <li>One hour consists of 60 minutes. |
| 171 | * <li>One minute consists of 60 seconds. |
| 172 | * <li>One second consists of 1000 milliseconds. |
| 173 | * </ul> |
| 174 | * Months and Years are imprecise and periods containing these values cannot be converted. |
| 175 | * |
| 176 | * @param period the period to get the number of hours from, null returns zero |
| 177 | * @return the period in days |
| 178 | * @throws IllegalArgumentException if the period contains imprecise duration values |
| 179 | */ |
| 180 | public static Days standardDaysIn(ReadablePeriod period) { |
| 181 | int amount = BaseSingleFieldPeriod.standardPeriodIn(period, DateTimeConstants.MILLIS_PER_DAY); |
| 182 | return Days.days(amount); |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * Creates a new <code>Days</code> by parsing a string in the ISO8601 format 'PnD'. |
| 187 | * <p> |
| 188 | * The parse will accept the full ISO syntax of PnYnMnWnDTnHnMnS however only the |
| 189 | * days component may be non-zero. If any other component is non-zero, an exception |
| 190 | * will be thrown. |
| 191 | * |
| 192 | * @param periodStr the period string, null returns zero |
| 193 | * @return the period in days |
| 194 | * @throws IllegalArgumentException if the string format is invalid |
| 195 | */ |
| 196 | public static Days parseDays(String periodStr) { |
| 197 | if (periodStr == null) { |
| 198 | return Days.ZERO; |
| 199 | } |
| 200 | Period p = PARSER.parsePeriod(periodStr); |
| 201 | return Days.days(p.getDays()); |
| 202 | } |
| 203 | |
| 204 | //----------------------------------------------------------------------- |
| 205 | /** |
| 206 | * Creates a new instance representing a number of days. |
| 207 | * You should consider using the factory method {@link #days(int)} |
| 208 | * instead of the constructor. |
| 209 | * |
| 210 | * @param days the number of days to represent |
| 211 | */ |
| 212 | private Days(int days) { |
| 213 | super(days); |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * Resolves singletons. |
| 218 | * |
| 219 | * @return the singleton instance |
| 220 | */ |
| 221 | private Object readResolve() { |
| 222 | return Days.days(getValue()); |
| 223 | } |
| 224 | |
| 225 | //----------------------------------------------------------------------- |
| 226 | /** |
| 227 | * Gets the duration field type, which is <code>days</code>. |
| 228 | * |
| 229 | * @return the period type |
| 230 | */ |
| 231 | public DurationFieldType getFieldType() { |
| 232 | return DurationFieldType.days(); |
| 233 | } |
| 234 | |
| 235 | /** |
| 236 | * Gets the period type, which is <code>days</code>. |
| 237 | * |
| 238 | * @return the period type |
| 239 | */ |
| 240 | public PeriodType getPeriodType() { |
| 241 | return PeriodType.days(); |
| 242 | } |
| 243 | |
| 244 | //----------------------------------------------------------------------- |
| 245 | /** |
| 246 | * Converts this period in days to a period in weeks assuming a |
| 247 | * 7 day week. |
| 248 | * <p> |
| 249 | * This method allows you to convert between different types of period. |
| 250 | * However to achieve this it makes the assumption that all weeks are |
| 251 | * 7 days long. |
| 252 | * This may not be true for some unusual chronologies. However, it is included |
| 253 | * as it is a useful operation for many applications and business rules. |
| 254 | * |
| 255 | * @return a period representing the number of weeks for this number of days |
| 256 | */ |
| 257 | public Weeks toStandardWeeks() { |
| 258 | return Weeks.weeks(getValue() / DateTimeConstants.DAYS_PER_WEEK); |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * Converts this period in days to a period in hours assuming a |
| 263 | * 24 hour day. |
| 264 | * <p> |
| 265 | * This method allows you to convert between different types of period. |
| 266 | * However to achieve this it makes the assumption that all days are 24 hours long. |
| 267 | * This is not true when daylight savings is considered and may also not |
| 268 | * be true for some unusual chronologies. However, it is included |
| 269 | * as it is a useful operation for many applications and business rules. |
| 270 | * |
| 271 | * @return a period representing the number of hours for this number of days |
| 272 | * @throws ArithmeticException if the number of hours is too large to be represented |
| 273 | */ |
| 274 | public Hours toStandardHours() { |
| 275 | return Hours.hours(FieldUtils.safeMultiply(getValue(), DateTimeConstants.HOURS_PER_DAY)); |
| 276 | } |
| 277 | |
| 278 | /** |
| 279 | * Converts this period in days to a period in minutes assuming a |
| 280 | * 24 hour day and 60 minute hour. |
| 281 | * <p> |
| 282 | * This method allows you to convert between different types of period. |
| 283 | * However to achieve this it makes the assumption that all days are 24 hours |
| 284 | * long and all hours are 60 minutes long. |
| 285 | * This is not true when daylight savings is considered and may also not |
| 286 | * be true for some unusual chronologies. However, it is included |
| 287 | * as it is a useful operation for many applications and business rules. |
| 288 | * |
| 289 | * @return a period representing the number of minutes for this number of days |
| 290 | * @throws ArithmeticException if the number of minutes is too large to be represented |
| 291 | */ |
| 292 | public Minutes toStandardMinutes() { |
| 293 | return Minutes.minutes(FieldUtils.safeMultiply(getValue(), DateTimeConstants.MINUTES_PER_DAY)); |
| 294 | } |
| 295 | |
| 296 | /** |
| 297 | * Converts this period in days to a period in seconds assuming a |
| 298 | * 24 hour day, 60 minute hour and 60 second minute. |
| 299 | * <p> |
| 300 | * This method allows you to convert between different types of period. |
| 301 | * However to achieve this it makes the assumption that all days are 24 hours |
| 302 | * long, all hours are 60 minutes long and all minutes are 60 seconds long. |
| 303 | * This is not true when daylight savings is considered and may also not |
| 304 | * be true for some unusual chronologies. However, it is included |
| 305 | * as it is a useful operation for many applications and business rules. |
| 306 | * |
| 307 | * @return a period representing the number of seconds for this number of days |
| 308 | * @throws ArithmeticException if the number of seconds is too large to be represented |
| 309 | */ |
| 310 | public Seconds toStandardSeconds() { |
| 311 | return Seconds.seconds(FieldUtils.safeMultiply(getValue(), DateTimeConstants.SECONDS_PER_DAY)); |
| 312 | } |
| 313 | |
| 314 | //----------------------------------------------------------------------- |
| 315 | /** |
| 316 | * Converts this period in days to a duration in milliseconds assuming a |
| 317 | * 24 hour day, 60 minute hour and 60 second minute. |
| 318 | * <p> |
| 319 | * This method allows you to convert from a period to a duration. |
| 320 | * However to achieve this it makes the assumption that all days are 24 hours |
| 321 | * long, all hours are 60 minutes and all minutes are 60 seconds. |
| 322 | * This is not true when daylight savings time is considered, and may also |
| 323 | * not be true for some unusual chronologies. However, it is included as it |
| 324 | * is a useful operation for many applications and business rules. |
| 325 | * |
| 326 | * @return a duration equivalent to this number of days |
| 327 | */ |
| 328 | public Duration toStandardDuration() { |
| 329 | long days = getValue(); // assign to a long |
| 330 | return new Duration(days * DateTimeConstants.MILLIS_PER_DAY); |
| 331 | } |
| 332 | |
| 333 | //----------------------------------------------------------------------- |
| 334 | /** |
| 335 | * Gets the number of days that this period represents. |
| 336 | * |
| 337 | * @return the number of days in the period |
| 338 | */ |
| 339 | public int getDays() { |
| 340 | return getValue(); |
| 341 | } |
| 342 | |
| 343 | //----------------------------------------------------------------------- |
| 344 | /** |
| 345 | * Returns a new instance with the specified number of days added. |
| 346 | * <p> |
| 347 | * This instance is immutable and unaffected by this method call. |
| 348 | * |
| 349 | * @param days the amount of days to add, may be negative |
| 350 | * @return the new period plus the specified number of days |
| 351 | * @throws ArithmeticException if the result overflows an int |
| 352 | */ |
| 353 | public Days plus(int days) { |
| 354 | if (days == 0) { |
| 355 | return this; |
| 356 | } |
| 357 | return Days.days(FieldUtils.safeAdd(getValue(), days)); |
| 358 | } |
| 359 | |
| 360 | /** |
| 361 | * Returns a new instance with the specified number of days added. |
| 362 | * <p> |
| 363 | * This instance is immutable and unaffected by this method call. |
| 364 | * |
| 365 | * @param days the amount of days to add, may be negative, null means zero |
| 366 | * @return the new period plus the specified number of days |
| 367 | * @throws ArithmeticException if the result overflows an int |
| 368 | */ |
| 369 | public Days plus(Days days) { |
| 370 | if (days == null) { |
| 371 | return this; |
| 372 | } |
| 373 | return plus(days.getValue()); |
| 374 | } |
| 375 | |
| 376 | //----------------------------------------------------------------------- |
| 377 | /** |
| 378 | * Returns a new instance with the specified number of days taken away. |
| 379 | * <p> |
| 380 | * This instance is immutable and unaffected by this method call. |
| 381 | * |
| 382 | * @param days the amount of days to take away, may be negative |
| 383 | * @return the new period minus the specified number of days |
| 384 | * @throws ArithmeticException if the result overflows an int |
| 385 | */ |
| 386 | public Days minus(int days) { |
| 387 | return plus(FieldUtils.safeNegate(days)); |
| 388 | } |
| 389 | |
| 390 | /** |
| 391 | * Returns a new instance with the specified number of days taken away. |
| 392 | * <p> |
| 393 | * This instance is immutable and unaffected by this method call. |
| 394 | * |
| 395 | * @param days the amount of days to take away, may be negative, null means zero |
| 396 | * @return the new period minus the specified number of days |
| 397 | * @throws ArithmeticException if the result overflows an int |
| 398 | */ |
| 399 | public Days minus(Days days) { |
| 400 | if (days == null) { |
| 401 | return this; |
| 402 | } |
| 403 | return minus(days.getValue()); |
| 404 | } |
| 405 | |
| 406 | //----------------------------------------------------------------------- |
| 407 | /** |
| 408 | * Returns a new instance with the days multiplied by the specified scalar. |
| 409 | * <p> |
| 410 | * This instance is immutable and unaffected by this method call. |
| 411 | * |
| 412 | * @param scalar the amount to multiply by, may be negative |
| 413 | * @return the new period multiplied by the specified scalar |
| 414 | * @throws ArithmeticException if the result overflows an int |
| 415 | */ |
| 416 | public Days multipliedBy(int scalar) { |
| 417 | return Days.days(FieldUtils.safeMultiply(getValue(), scalar)); |
| 418 | } |
| 419 | |
| 420 | /** |
| 421 | * Returns a new instance with the days divided by the specified divisor. |
| 422 | * The calculation uses integer division, thus 3 divided by 2 is 1. |
| 423 | * <p> |
| 424 | * This instance is immutable and unaffected by this method call. |
| 425 | * |
| 426 | * @param divisor the amount to divide by, may be negative |
| 427 | * @return the new period divided by the specified divisor |
| 428 | * @throws ArithmeticException if the divisor is zero |
| 429 | */ |
| 430 | public Days dividedBy(int divisor) { |
| 431 | if (divisor == 1) { |
| 432 | return this; |
| 433 | } |
| 434 | return Days.days(getValue() / divisor); |
| 435 | } |
| 436 | |
| 437 | //----------------------------------------------------------------------- |
| 438 | /** |
| 439 | * Returns a new instance with the days value negated. |
| 440 | * |
| 441 | * @return the new period with a negated value |
| 442 | * @throws ArithmeticException if the result overflows an int |
| 443 | */ |
| 444 | public Days negated() { |
| 445 | return Days.days(FieldUtils.safeNegate(getValue())); |
| 446 | } |
| 447 | |
| 448 | //----------------------------------------------------------------------- |
| 449 | /** |
| 450 | * Is this days instance greater than the specified number of days. |
| 451 | * |
| 452 | * @param other the other period, null means zero |
| 453 | * @return true if this days instance is greater than the specified one |
| 454 | */ |
| 455 | public boolean isGreaterThan(Days other) { |
| 456 | if (other == null) { |
| 457 | return getValue() > 0; |
| 458 | } |
| 459 | return getValue() > other.getValue(); |
| 460 | } |
| 461 | |
| 462 | /** |
| 463 | * Is this days instance less than the specified number of days. |
| 464 | * |
| 465 | * @param other the other period, null means zero |
| 466 | * @return true if this days instance is less than the specified one |
| 467 | */ |
| 468 | public boolean isLessThan(Days other) { |
| 469 | if (other == null) { |
| 470 | return getValue() < 0; |
| 471 | } |
| 472 | return getValue() < other.getValue(); |
| 473 | } |
| 474 | |
| 475 | //----------------------------------------------------------------------- |
| 476 | /** |
| 477 | * Gets this instance as a String in the ISO8601 duration format. |
| 478 | * <p> |
| 479 | * For example, "P4D" represents 4 days. |
| 480 | * |
| 481 | * @return the value as an ISO8601 string |
| 482 | */ |
| 483 | public String toString() { |
| 484 | return "P" + String.valueOf(getValue()) + "D"; |
| 485 | } |
| 486 | |
| 487 | } |