1 /* 2 * Copyright (c) 1996, 2017, 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 * (C) Copyright Taligent, Inc. 1996-1998 - All Rights Reserved 28 * (C) Copyright IBM Corp. 1996-1998 - All Rights Reserved 29 * 30 * The original version of this source code and documentation is copyrighted 31 * and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These 32 * materials are provided under terms of a License Agreement between Taligent 33 * and Sun. This technology is protected by multiple US and International 34 * patents. This notice and attribution to Taligent may not be removed. 35 * Taligent is a registered trademark of Taligent, Inc. 36 * 37 */ 38 39 package java.util; 40 41 import java.io.IOException; 42 import java.io.ObjectInputStream; 43 import java.io.ObjectOutputStream; 44 import java.io.OptionalDataException; 45 import java.io.Serializable; 46 import java.security.AccessControlContext; 47 import java.security.AccessController; 48 import java.security.PermissionCollection; 49 import java.security.PrivilegedActionException; 50 import java.security.PrivilegedExceptionAction; 51 import java.security.ProtectionDomain; 52 import java.text.DateFormat; 53 import java.text.DateFormatSymbols; 54 import java.time.Instant; 55 import java.util.concurrent.ConcurrentHashMap; 56 import java.util.concurrent.ConcurrentMap; 57 import sun.util.BuddhistCalendar; 58 import sun.util.calendar.ZoneInfo; 59 import sun.util.locale.provider.CalendarDataUtility; 60 import sun.util.locale.provider.LocaleProviderAdapter; 61 import sun.util.locale.provider.TimeZoneNameUtility; 62 import sun.util.spi.CalendarProvider; 63 64 /** 65 * The <code>Calendar</code> class is an abstract class that provides methods 66 * for converting between a specific instant in time and a set of {@link 67 * #fields calendar fields} such as <code>YEAR</code>, <code>MONTH</code>, 68 * <code>DAY_OF_MONTH</code>, <code>HOUR</code>, and so on, and for 69 * manipulating the calendar fields, such as getting the date of the next 70 * week. An instant in time can be represented by a millisecond value that is 71 * an offset from the <a id="Epoch"><em>Epoch</em></a>, January 1, 1970 72 * 00:00:00.000 GMT (Gregorian). 73 * 74 * <p>The class also provides additional fields and methods for 75 * implementing a concrete calendar system outside the package. Those 76 * fields and methods are defined as <code>protected</code>. 77 * 78 * <p> 79 * Like other locale-sensitive classes, <code>Calendar</code> provides a 80 * class method, <code>getInstance</code>, for getting a generally useful 81 * object of this type. <code>Calendar</code>'s <code>getInstance</code> method 82 * returns a <code>Calendar</code> object whose 83 * calendar fields have been initialized with the current date and time: 84 * <blockquote> 85 * <pre> 86 * Calendar rightNow = Calendar.getInstance(); 87 * </pre> 88 * </blockquote> 89 * 90 * <p>A <code>Calendar</code> object can produce all the calendar field values 91 * needed to implement the date-time formatting for a particular language and 92 * calendar style (for example, Japanese-Gregorian, Japanese-Traditional). 93 * <code>Calendar</code> defines the range of values returned by 94 * certain calendar fields, as well as their meaning. For example, 95 * the first month of the calendar system has value <code>MONTH == 96 * JANUARY</code> for all calendars. Other values are defined by the 97 * concrete subclass, such as <code>ERA</code>. See individual field 98 * documentation and subclass documentation for details. 99 * 100 * <h3>Getting and Setting Calendar Field Values</h3> 101 * 102 * <p>The calendar field values can be set by calling the <code>set</code> 103 * methods. Any field values set in a <code>Calendar</code> will not be 104 * interpreted until it needs to calculate its time value (milliseconds from 105 * the Epoch) or values of the calendar fields. Calling the 106 * <code>get</code>, <code>getTimeInMillis</code>, <code>getTime</code>, 107 * <code>add</code> and <code>roll</code> involves such calculation. 108 * 109 * <h4>Leniency</h4> 110 * 111 * <p><code>Calendar</code> has two modes for interpreting the calendar 112 * fields, <em>lenient</em> and <em>non-lenient</em>. When a 113 * <code>Calendar</code> is in lenient mode, it accepts a wider range of 114 * calendar field values than it produces. When a <code>Calendar</code> 115 * recomputes calendar field values for return by <code>get()</code>, all of 116 * the calendar fields are normalized. For example, a lenient 117 * <code>GregorianCalendar</code> interprets <code>MONTH == JANUARY</code>, 118 * <code>DAY_OF_MONTH == 32</code> as February 1. 119 120 * <p>When a <code>Calendar</code> is in non-lenient mode, it throws an 121 * exception if there is any inconsistency in its calendar fields. For 122 * example, a <code>GregorianCalendar</code> always produces 123 * <code>DAY_OF_MONTH</code> values between 1 and the length of the month. A 124 * non-lenient <code>GregorianCalendar</code> throws an exception upon 125 * calculating its time or calendar field values if any out-of-range field 126 * value has been set. 127 * 128 * <h4><a id="first_week">First Week</a></h4> 129 * 130 * <code>Calendar</code> defines a locale-specific seven day week using two 131 * parameters: the first day of the week and the minimal days in first week 132 * (from 1 to 7). These numbers are taken from the locale resource data or the 133 * locale itself when a <code>Calendar</code> is constructed. If the designated 134 * locale contains "fw" and/or "rg" <a href="./Locale.html#def_locale_extension"> 135 * Unicode extensions</a>, the first day of the week will be obtained according to 136 * those extensions. If both "fw" and "rg" are specified, the value from "fw" 137 * extension supersedes the implicit one from "rg" extension. 138 * They may also be specified explicitly through the methods for setting their 139 * values. 140 * 141 * <p>When setting or getting the <code>WEEK_OF_MONTH</code> or 142 * <code>WEEK_OF_YEAR</code> fields, <code>Calendar</code> must determine the 143 * first week of the month or year as a reference point. The first week of a 144 * month or year is defined as the earliest seven day period beginning on 145 * <code>getFirstDayOfWeek()</code> and containing at least 146 * <code>getMinimalDaysInFirstWeek()</code> days of that month or year. Weeks 147 * numbered ..., -1, 0 precede the first week; weeks numbered 2, 3,... follow 148 * it. Note that the normalized numbering returned by <code>get()</code> may be 149 * different. For example, a specific <code>Calendar</code> subclass may 150 * designate the week before week 1 of a year as week <code><i>n</i></code> of 151 * the previous year. 152 * 153 * <h4>Calendar Fields Resolution</h4> 154 * 155 * When computing a date and time from the calendar fields, there 156 * may be insufficient information for the computation (such as only 157 * year and month with no day of month), or there may be inconsistent 158 * information (such as Tuesday, July 15, 1996 (Gregorian) -- July 15, 159 * 1996 is actually a Monday). <code>Calendar</code> will resolve 160 * calendar field values to determine the date and time in the 161 * following way. 162 * 163 * <p><a id="resolution">If there is any conflict in calendar field values, 164 * <code>Calendar</code> gives priorities to calendar fields that have been set 165 * more recently.</a> The following are the default combinations of the 166 * calendar fields. The most recent combination, as determined by the 167 * most recently set single field, will be used. 168 * 169 * <p><a id="date_resolution">For the date fields</a>: 170 * <blockquote> 171 * <pre> 172 * YEAR + MONTH + DAY_OF_MONTH 173 * YEAR + MONTH + WEEK_OF_MONTH + DAY_OF_WEEK 174 * YEAR + MONTH + DAY_OF_WEEK_IN_MONTH + DAY_OF_WEEK 175 * YEAR + DAY_OF_YEAR 176 * YEAR + DAY_OF_WEEK + WEEK_OF_YEAR 177 * </pre></blockquote> 178 * 179 * <a id="time_resolution">For the time of day fields</a>: 180 * <blockquote> 181 * <pre> 182 * HOUR_OF_DAY 183 * AM_PM + HOUR 184 * </pre></blockquote> 185 * 186 * <p>If there are any calendar fields whose values haven't been set in the selected 187 * field combination, <code>Calendar</code> uses their default values. The default 188 * value of each field may vary by concrete calendar systems. For example, in 189 * <code>GregorianCalendar</code>, the default of a field is the same as that 190 * of the start of the Epoch: i.e., <code>YEAR = 1970</code>, <code>MONTH = 191 * JANUARY</code>, <code>DAY_OF_MONTH = 1</code>, etc. 192 * 193 * <p> 194 * <strong>Note:</strong> There are certain possible ambiguities in 195 * interpretation of certain singular times, which are resolved in the 196 * following ways: 197 * <ol> 198 * <li> 23:59 is the last minute of the day and 00:00 is the first 199 * minute of the next day. Thus, 23:59 on Dec 31, 1999 < 00:00 on 200 * Jan 1, 2000 < 00:01 on Jan 1, 2000. 201 * 202 * <li> Although historically not precise, midnight also belongs to "am", 203 * and noon belongs to "pm", so on the same day, 204 * 12:00 am (midnight) < 12:01 am, and 12:00 pm (noon) < 12:01 pm 205 * </ol> 206 * 207 * <p> 208 * The date or time format strings are not part of the definition of a 209 * calendar, as those must be modifiable or overridable by the user at 210 * runtime. Use {@link DateFormat} 211 * to format dates. 212 * 213 * <h4>Field Manipulation</h4> 214 * 215 * The calendar fields can be changed using three methods: 216 * <code>set()</code>, <code>add()</code>, and <code>roll()</code>. 217 * 218 * <p><strong><code>set(f, value)</code></strong> changes calendar field 219 * <code>f</code> to <code>value</code>. In addition, it sets an 220 * internal member variable to indicate that calendar field <code>f</code> has 221 * been changed. Although calendar field <code>f</code> is changed immediately, 222 * the calendar's time value in milliseconds is not recomputed until the next call to 223 * <code>get()</code>, <code>getTime()</code>, <code>getTimeInMillis()</code>, 224 * <code>add()</code>, or <code>roll()</code> is made. Thus, multiple calls to 225 * <code>set()</code> do not trigger multiple, unnecessary 226 * computations. As a result of changing a calendar field using 227 * <code>set()</code>, other calendar fields may also change, depending on the 228 * calendar field, the calendar field value, and the calendar system. In addition, 229 * <code>get(f)</code> will not necessarily return <code>value</code> set by 230 * the call to the <code>set</code> method 231 * after the calendar fields have been recomputed. The specifics are determined by 232 * the concrete calendar class.</p> 233 * 234 * <p><em>Example</em>: Consider a <code>GregorianCalendar</code> 235 * originally set to August 31, 1999. Calling <code>set(Calendar.MONTH, 236 * Calendar.SEPTEMBER)</code> sets the date to September 31, 237 * 1999. This is a temporary internal representation that resolves to 238 * October 1, 1999 if <code>getTime()</code>is then called. However, a 239 * call to <code>set(Calendar.DAY_OF_MONTH, 30)</code> before the call to 240 * <code>getTime()</code> sets the date to September 30, 1999, since 241 * no recomputation occurs after <code>set()</code> itself.</p> 242 * 243 * <p><strong><code>add(f, delta)</code></strong> adds <code>delta</code> 244 * to field <code>f</code>. This is equivalent to calling <code>set(f, 245 * get(f) + delta)</code> with two adjustments:</p> 246 * 247 * <blockquote> 248 * <p><strong>Add rule 1</strong>. The value of field <code>f</code> 249 * after the call minus the value of field <code>f</code> before the 250 * call is <code>delta</code>, modulo any overflow that has occurred in 251 * field <code>f</code>. Overflow occurs when a field value exceeds its 252 * range and, as a result, the next larger field is incremented or 253 * decremented and the field value is adjusted back into its range.</p> 254 * 255 * <p><strong>Add rule 2</strong>. If a smaller field is expected to be 256 * invariant, but it is impossible for it to be equal to its 257 * prior value because of changes in its minimum or maximum after field 258 * <code>f</code> is changed or other constraints, such as time zone 259 * offset changes, then its value is adjusted to be as close 260 * as possible to its expected value. A smaller field represents a 261 * smaller unit of time. <code>HOUR</code> is a smaller field than 262 * <code>DAY_OF_MONTH</code>. No adjustment is made to smaller fields 263 * that are not expected to be invariant. The calendar system 264 * determines what fields are expected to be invariant.</p> 265 * </blockquote> 266 * 267 * <p>In addition, unlike <code>set()</code>, <code>add()</code> forces 268 * an immediate recomputation of the calendar's milliseconds and all 269 * fields.</p> 270 * 271 * <p><em>Example</em>: Consider a <code>GregorianCalendar</code> 272 * originally set to August 31, 1999. Calling <code>add(Calendar.MONTH, 273 * 13)</code> sets the calendar to September 30, 2000. <strong>Add rule 274 * 1</strong> sets the <code>MONTH</code> field to September, since 275 * adding 13 months to August gives September of the next year. Since 276 * <code>DAY_OF_MONTH</code> cannot be 31 in September in a 277 * <code>GregorianCalendar</code>, <strong>add rule 2</strong> sets the 278 * <code>DAY_OF_MONTH</code> to 30, the closest possible value. Although 279 * it is a smaller field, <code>DAY_OF_WEEK</code> is not adjusted by 280 * rule 2, since it is expected to change when the month changes in a 281 * <code>GregorianCalendar</code>.</p> 282 * 283 * <p><strong><code>roll(f, delta)</code></strong> adds 284 * <code>delta</code> to field <code>f</code> without changing larger 285 * fields. This is equivalent to calling <code>add(f, delta)</code> with 286 * the following adjustment:</p> 287 * 288 * <blockquote> 289 * <p><strong>Roll rule</strong>. Larger fields are unchanged after the 290 * call. A larger field represents a larger unit of 291 * time. <code>DAY_OF_MONTH</code> is a larger field than 292 * <code>HOUR</code>.</p> 293 * </blockquote> 294 * 295 * <p><em>Example</em>: See {@link java.util.GregorianCalendar#roll(int, int)}. 296 * 297 * <p><strong>Usage model</strong>. To motivate the behavior of 298 * <code>add()</code> and <code>roll()</code>, consider a user interface 299 * component with increment and decrement buttons for the month, day, and 300 * year, and an underlying <code>GregorianCalendar</code>. If the 301 * interface reads January 31, 1999 and the user presses the month 302 * increment button, what should it read? If the underlying 303 * implementation uses <code>set()</code>, it might read March 3, 1999. A 304 * better result would be February 28, 1999. Furthermore, if the user 305 * presses the month increment button again, it should read March 31, 306 * 1999, not March 28, 1999. By saving the original date and using either 307 * <code>add()</code> or <code>roll()</code>, depending on whether larger 308 * fields should be affected, the user interface can behave as most users 309 * will intuitively expect.</p> 310 * 311 * @see java.lang.System#currentTimeMillis() 312 * @see Date 313 * @see GregorianCalendar 314 * @see TimeZone 315 * @see java.text.DateFormat 316 * @author Mark Davis, David Goldsmith, Chen-Lieh Huang, Alan Liu 317 * @since 1.1 318 */ 319 public abstract class Calendar implements Serializable, Cloneable, Comparable<Calendar> { 320 321 // Data flow in Calendar 322 // --------------------- 323 324 // The current time is represented in two ways by Calendar: as UTC 325 // milliseconds from the epoch (1 January 1970 0:00 UTC), and as local 326 // fields such as MONTH, HOUR, AM_PM, etc. It is possible to compute the 327 // millis from the fields, and vice versa. The data needed to do this 328 // conversion is encapsulated by a TimeZone object owned by the Calendar. 329 // The data provided by the TimeZone object may also be overridden if the 330 // user sets the ZONE_OFFSET and/or DST_OFFSET fields directly. The class 331 // keeps track of what information was most recently set by the caller, and 332 // uses that to compute any other information as needed. 333 334 // If the user sets the fields using set(), the data flow is as follows. 335 // This is implemented by the Calendar subclass's computeTime() method. 336 // During this process, certain fields may be ignored. The disambiguation 337 // algorithm for resolving which fields to pay attention to is described 338 // in the class documentation. 339 340 // local fields (YEAR, MONTH, DATE, HOUR, MINUTE, etc.) 341 // | 342 // | Using Calendar-specific algorithm 343 // V 344 // local standard millis 345 // | 346 // | Using TimeZone or user-set ZONE_OFFSET / DST_OFFSET 347 // V 348 // UTC millis (in time data member) 349 350 // If the user sets the UTC millis using setTime() or setTimeInMillis(), 351 // the data flow is as follows. This is implemented by the Calendar 352 // subclass's computeFields() method. 353 354 // UTC millis (in time data member) 355 // | 356 // | Using TimeZone getOffset() 357 // V 358 // local standard millis 359 // | 360 // | Using Calendar-specific algorithm 361 // V 362 // local fields (YEAR, MONTH, DATE, HOUR, MINUTE, etc.) 363 364 // In general, a round trip from fields, through local and UTC millis, and 365 // back out to fields is made when necessary. This is implemented by the 366 // complete() method. Resolving a partial set of fields into a UTC millis 367 // value allows all remaining fields to be generated from that value. If 368 // the Calendar is lenient, the fields are also renormalized to standard 369 // ranges when they are regenerated. 370 371 /** 372 * Field number for <code>get</code> and <code>set</code> indicating the 373 * era, e.g., AD or BC in the Julian calendar. This is a calendar-specific 374 * value; see subclass documentation. 375 * 376 * @see GregorianCalendar#AD 377 * @see GregorianCalendar#BC 378 */ 379 public static final int ERA = 0; 380 381 /** 382 * Field number for <code>get</code> and <code>set</code> indicating the 383 * year. This is a calendar-specific value; see subclass documentation. 384 */ 385 public static final int YEAR = 1; 386 387 /** 388 * Field number for <code>get</code> and <code>set</code> indicating the 389 * month. This is a calendar-specific value. The first month of 390 * the year in the Gregorian and Julian calendars is 391 * <code>JANUARY</code> which is 0; the last depends on the number 392 * of months in a year. 393 * 394 * @see #JANUARY 395 * @see #FEBRUARY 396 * @see #MARCH 397 * @see #APRIL 398 * @see #MAY 399 * @see #JUNE 400 * @see #JULY 401 * @see #AUGUST 402 * @see #SEPTEMBER 403 * @see #OCTOBER 404 * @see #NOVEMBER 405 * @see #DECEMBER 406 * @see #UNDECIMBER 407 */ 408 public static final int MONTH = 2; 409 410 /** 411 * Field number for <code>get</code> and <code>set</code> indicating the 412 * week number within the current year. The first week of the year, as 413 * defined by <code>getFirstDayOfWeek()</code> and 414 * <code>getMinimalDaysInFirstWeek()</code>, has value 1. Subclasses define 415 * the value of <code>WEEK_OF_YEAR</code> for days before the first week of 416 * the year. 417 * 418 * @see #getFirstDayOfWeek 419 * @see #getMinimalDaysInFirstWeek 420 */ 421 public static final int WEEK_OF_YEAR = 3; 422 423 /** 424 * Field number for <code>get</code> and <code>set</code> indicating the 425 * week number within the current month. The first week of the month, as 426 * defined by <code>getFirstDayOfWeek()</code> and 427 * <code>getMinimalDaysInFirstWeek()</code>, has value 1. Subclasses define 428 * the value of <code>WEEK_OF_MONTH</code> for days before the first week of 429 * the month. 430 * 431 * @see #getFirstDayOfWeek 432 * @see #getMinimalDaysInFirstWeek 433 */ 434 public static final int WEEK_OF_MONTH = 4; 435 436 /** 437 * Field number for <code>get</code> and <code>set</code> indicating the 438 * day of the month. This is a synonym for <code>DAY_OF_MONTH</code>. 439 * The first day of the month has value 1. 440 * 441 * @see #DAY_OF_MONTH 442 */ 443 public static final int DATE = 5; 444 445 /** 446 * Field number for <code>get</code> and <code>set</code> indicating the 447 * day of the month. This is a synonym for <code>DATE</code>. 448 * The first day of the month has value 1. 449 * 450 * @see #DATE 451 */ 452 public static final int DAY_OF_MONTH = 5; 453 454 /** 455 * Field number for <code>get</code> and <code>set</code> indicating the day 456 * number within the current year. The first day of the year has value 1. 457 */ 458 public static final int DAY_OF_YEAR = 6; 459 460 /** 461 * Field number for <code>get</code> and <code>set</code> indicating the day 462 * of the week. This field takes values <code>SUNDAY</code>, 463 * <code>MONDAY</code>, <code>TUESDAY</code>, <code>WEDNESDAY</code>, 464 * <code>THURSDAY</code>, <code>FRIDAY</code>, and <code>SATURDAY</code>. 465 * 466 * @see #SUNDAY 467 * @see #MONDAY 468 * @see #TUESDAY 469 * @see #WEDNESDAY 470 * @see #THURSDAY 471 * @see #FRIDAY 472 * @see #SATURDAY 473 */ 474 public static final int DAY_OF_WEEK = 7; 475 476 /** 477 * Field number for <code>get</code> and <code>set</code> indicating the 478 * ordinal number of the day of the week within the current month. Together 479 * with the <code>DAY_OF_WEEK</code> field, this uniquely specifies a day 480 * within a month. Unlike <code>WEEK_OF_MONTH</code> and 481 * <code>WEEK_OF_YEAR</code>, this field's value does <em>not</em> depend on 482 * <code>getFirstDayOfWeek()</code> or 483 * <code>getMinimalDaysInFirstWeek()</code>. <code>DAY_OF_MONTH 1</code> 484 * through <code>7</code> always correspond to <code>DAY_OF_WEEK_IN_MONTH 485 * 1</code>; <code>8</code> through <code>14</code> correspond to 486 * <code>DAY_OF_WEEK_IN_MONTH 2</code>, and so on. 487 * <code>DAY_OF_WEEK_IN_MONTH 0</code> indicates the week before 488 * <code>DAY_OF_WEEK_IN_MONTH 1</code>. Negative values count back from the 489 * end of the month, so the last Sunday of a month is specified as 490 * <code>DAY_OF_WEEK = SUNDAY, DAY_OF_WEEK_IN_MONTH = -1</code>. Because 491 * negative values count backward they will usually be aligned differently 492 * within the month than positive values. For example, if a month has 31 493 * days, <code>DAY_OF_WEEK_IN_MONTH -1</code> will overlap 494 * <code>DAY_OF_WEEK_IN_MONTH 5</code> and the end of <code>4</code>. 495 * 496 * @see #DAY_OF_WEEK 497 * @see #WEEK_OF_MONTH 498 */ 499 public static final int DAY_OF_WEEK_IN_MONTH = 8; 500 501 /** 502 * Field number for <code>get</code> and <code>set</code> indicating 503 * whether the <code>HOUR</code> is before or after noon. 504 * E.g., at 10:04:15.250 PM the <code>AM_PM</code> is <code>PM</code>. 505 * 506 * @see #AM 507 * @see #PM 508 * @see #HOUR 509 */ 510 public static final int AM_PM = 9; 511 512 /** 513 * Field number for <code>get</code> and <code>set</code> indicating the 514 * hour of the morning or afternoon. <code>HOUR</code> is used for the 515 * 12-hour clock (0 - 11). Noon and midnight are represented by 0, not by 12. 516 * E.g., at 10:04:15.250 PM the <code>HOUR</code> is 10. 517 * 518 * @see #AM_PM 519 * @see #HOUR_OF_DAY 520 */ 521 public static final int HOUR = 10; 522 523 /** 524 * Field number for <code>get</code> and <code>set</code> indicating the 525 * hour of the day. <code>HOUR_OF_DAY</code> is used for the 24-hour clock. 526 * E.g., at 10:04:15.250 PM the <code>HOUR_OF_DAY</code> is 22. 527 * 528 * @see #HOUR 529 */ 530 public static final int HOUR_OF_DAY = 11; 531 532 /** 533 * Field number for <code>get</code> and <code>set</code> indicating the 534 * minute within the hour. 535 * E.g., at 10:04:15.250 PM the <code>MINUTE</code> is 4. 536 */ 537 public static final int MINUTE = 12; 538 539 /** 540 * Field number for <code>get</code> and <code>set</code> indicating the 541 * second within the minute. 542 * E.g., at 10:04:15.250 PM the <code>SECOND</code> is 15. 543 */ 544 public static final int SECOND = 13; 545 546 /** 547 * Field number for <code>get</code> and <code>set</code> indicating the 548 * millisecond within the second. 549 * E.g., at 10:04:15.250 PM the <code>MILLISECOND</code> is 250. 550 */ 551 public static final int MILLISECOND = 14; 552 553 /** 554 * Field number for <code>get</code> and <code>set</code> 555 * indicating the raw offset from GMT in milliseconds. 556 * <p> 557 * This field reflects the correct GMT offset value of the time 558 * zone of this <code>Calendar</code> if the 559 * <code>TimeZone</code> implementation subclass supports 560 * historical GMT offset changes. 561 */ 562 public static final int ZONE_OFFSET = 15; 563 564 /** 565 * Field number for <code>get</code> and <code>set</code> indicating the 566 * daylight saving offset in milliseconds. 567 * <p> 568 * This field reflects the correct daylight saving offset value of 569 * the time zone of this <code>Calendar</code> if the 570 * <code>TimeZone</code> implementation subclass supports 571 * historical Daylight Saving Time schedule changes. 572 */ 573 public static final int DST_OFFSET = 16; 574 575 /** 576 * The number of distinct fields recognized by <code>get</code> and <code>set</code>. 577 * Field numbers range from <code>0..FIELD_COUNT-1</code>. 578 */ 579 public static final int FIELD_COUNT = 17; 580 581 /** 582 * Value of the {@link #DAY_OF_WEEK} field indicating 583 * Sunday. 584 */ 585 public static final int SUNDAY = 1; 586 587 /** 588 * Value of the {@link #DAY_OF_WEEK} field indicating 589 * Monday. 590 */ 591 public static final int MONDAY = 2; 592 593 /** 594 * Value of the {@link #DAY_OF_WEEK} field indicating 595 * Tuesday. 596 */ 597 public static final int TUESDAY = 3; 598 599 /** 600 * Value of the {@link #DAY_OF_WEEK} field indicating 601 * Wednesday. 602 */ 603 public static final int WEDNESDAY = 4; 604 605 /** 606 * Value of the {@link #DAY_OF_WEEK} field indicating 607 * Thursday. 608 */ 609 public static final int THURSDAY = 5; 610 611 /** 612 * Value of the {@link #DAY_OF_WEEK} field indicating 613 * Friday. 614 */ 615 public static final int FRIDAY = 6; 616 617 /** 618 * Value of the {@link #DAY_OF_WEEK} field indicating 619 * Saturday. 620 */ 621 public static final int SATURDAY = 7; 622 623 /** 624 * Value of the {@link #MONTH} field indicating the 625 * first month of the year in the Gregorian and Julian calendars. 626 */ 627 public static final int JANUARY = 0; 628 629 /** 630 * Value of the {@link #MONTH} field indicating the 631 * second month of the year in the Gregorian and Julian calendars. 632 */ 633 public static final int FEBRUARY = 1; 634 635 /** 636 * Value of the {@link #MONTH} field indicating the 637 * third month of the year in the Gregorian and Julian calendars. 638 */ 639 public static final int MARCH = 2; 640 641 /** 642 * Value of the {@link #MONTH} field indicating the 643 * fourth month of the year in the Gregorian and Julian calendars. 644 */ 645 public static final int APRIL = 3; 646 647 /** 648 * Value of the {@link #MONTH} field indicating the 649 * fifth month of the year in the Gregorian and Julian calendars. 650 */ 651 public static final int MAY = 4; 652 653 /** 654 * Value of the {@link #MONTH} field indicating the 655 * sixth month of the year in the Gregorian and Julian calendars. 656 */ 657 public static final int JUNE = 5; 658 659 /** 660 * Value of the {@link #MONTH} field indicating the 661 * seventh month of the year in the Gregorian and Julian calendars. 662 */ 663 public static final int JULY = 6; 664 665 /** 666 * Value of the {@link #MONTH} field indicating the 667 * eighth month of the year in the Gregorian and Julian calendars. 668 */ 669 public static final int AUGUST = 7; 670 671 /** 672 * Value of the {@link #MONTH} field indicating the 673 * ninth month of the year in the Gregorian and Julian calendars. 674 */ 675 public static final int SEPTEMBER = 8; 676 677 /** 678 * Value of the {@link #MONTH} field indicating the 679 * tenth month of the year in the Gregorian and Julian calendars. 680 */ 681 public static final int OCTOBER = 9; 682 683 /** 684 * Value of the {@link #MONTH} field indicating the 685 * eleventh month of the year in the Gregorian and Julian calendars. 686 */ 687 public static final int NOVEMBER = 10; 688 689 /** 690 * Value of the {@link #MONTH} field indicating the 691 * twelfth month of the year in the Gregorian and Julian calendars. 692 */ 693 public static final int DECEMBER = 11; 694 695 /** 696 * Value of the {@link #MONTH} field indicating the 697 * thirteenth month of the year. Although <code>GregorianCalendar</code> 698 * does not use this value, lunar calendars do. 699 */ 700 public static final int UNDECIMBER = 12; 701 702 /** 703 * Value of the {@link #AM_PM} field indicating the 704 * period of the day from midnight to just before noon. 705 */ 706 public static final int AM = 0; 707 708 /** 709 * Value of the {@link #AM_PM} field indicating the 710 * period of the day from noon to just before midnight. 711 */ 712 public static final int PM = 1; 713 714 /** 715 * A style specifier for {@link #getDisplayNames(int, int, Locale) 716 * getDisplayNames} indicating names in all styles, such as 717 * "January" and "Jan". 718 * 719 * @see #SHORT_FORMAT 720 * @see #LONG_FORMAT 721 * @see #SHORT_STANDALONE 722 * @see #LONG_STANDALONE 723 * @see #SHORT 724 * @see #LONG 725 * @since 1.6 726 */ 727 public static final int ALL_STYLES = 0; 728 729 static final int STANDALONE_MASK = 0x8000; 730 731 /** 732 * A style specifier for {@link #getDisplayName(int, int, Locale) 733 * getDisplayName} and {@link #getDisplayNames(int, int, Locale) 734 * getDisplayNames} equivalent to {@link #SHORT_FORMAT}. 735 * 736 * @see #SHORT_STANDALONE 737 * @see #LONG 738 * @since 1.6 739 */ 740 public static final int SHORT = 1; 741 742 /** 743 * A style specifier for {@link #getDisplayName(int, int, Locale) 744 * getDisplayName} and {@link #getDisplayNames(int, int, Locale) 745 * getDisplayNames} equivalent to {@link #LONG_FORMAT}. 746 * 747 * @see #LONG_STANDALONE 748 * @see #SHORT 749 * @since 1.6 750 */ 751 public static final int LONG = 2; 752 753 /** 754 * A style specifier for {@link #getDisplayName(int, int, Locale) 755 * getDisplayName} and {@link #getDisplayNames(int, int, Locale) 756 * getDisplayNames} indicating a narrow name used for format. Narrow names 757 * are typically single character strings, such as "M" for Monday. 758 * 759 * @see #NARROW_STANDALONE 760 * @see #SHORT_FORMAT 761 * @see #LONG_FORMAT 762 * @since 1.8 763 */ 764 public static final int NARROW_FORMAT = 4; 765 766 /** 767 * A style specifier for {@link #getDisplayName(int, int, Locale) 768 * getDisplayName} and {@link #getDisplayNames(int, int, Locale) 769 * getDisplayNames} indicating a narrow name independently. Narrow names 770 * are typically single character strings, such as "M" for Monday. 771 * 772 * @see #NARROW_FORMAT 773 * @see #SHORT_STANDALONE 774 * @see #LONG_STANDALONE 775 * @since 1.8 776 */ 777 public static final int NARROW_STANDALONE = NARROW_FORMAT | STANDALONE_MASK; 778 779 /** 780 * A style specifier for {@link #getDisplayName(int, int, Locale) 781 * getDisplayName} and {@link #getDisplayNames(int, int, Locale) 782 * getDisplayNames} indicating a short name used for format. 783 * 784 * @see #SHORT_STANDALONE 785 * @see #LONG_FORMAT 786 * @see #LONG_STANDALONE 787 * @since 1.8 788 */ 789 public static final int SHORT_FORMAT = 1; 790 791 /** 792 * A style specifier for {@link #getDisplayName(int, int, Locale) 793 * getDisplayName} and {@link #getDisplayNames(int, int, Locale) 794 * getDisplayNames} indicating a long name used for format. 795 * 796 * @see #LONG_STANDALONE 797 * @see #SHORT_FORMAT 798 * @see #SHORT_STANDALONE 799 * @since 1.8 800 */ 801 public static final int LONG_FORMAT = 2; 802 803 /** 804 * A style specifier for {@link #getDisplayName(int, int, Locale) 805 * getDisplayName} and {@link #getDisplayNames(int, int, Locale) 806 * getDisplayNames} indicating a short name used independently, 807 * such as a month abbreviation as calendar headers. 808 * 809 * @see #SHORT_FORMAT 810 * @see #LONG_FORMAT 811 * @see #LONG_STANDALONE 812 * @since 1.8 813 */ 814 public static final int SHORT_STANDALONE = SHORT | STANDALONE_MASK; 815 816 /** 817 * A style specifier for {@link #getDisplayName(int, int, Locale) 818 * getDisplayName} and {@link #getDisplayNames(int, int, Locale) 819 * getDisplayNames} indicating a long name used independently, 820 * such as a month name as calendar headers. 821 * 822 * @see #LONG_FORMAT 823 * @see #SHORT_FORMAT 824 * @see #SHORT_STANDALONE 825 * @since 1.8 826 */ 827 public static final int LONG_STANDALONE = LONG | STANDALONE_MASK; 828 829 // Internal notes: 830 // Calendar contains two kinds of time representations: current "time" in 831 // milliseconds, and a set of calendar "fields" representing the current time. 832 // The two representations are usually in sync, but can get out of sync 833 // as follows. 834 // 1. Initially, no fields are set, and the time is invalid. 835 // 2. If the time is set, all fields are computed and in sync. 836 // 3. If a single field is set, the time is invalid. 837 // Recomputation of the time and fields happens when the object needs 838 // to return a result to the user, or use a result for a computation. 839 840 /** 841 * The calendar field values for the currently set time for this calendar. 842 * This is an array of <code>FIELD_COUNT</code> integers, with index values 843 * <code>ERA</code> through <code>DST_OFFSET</code>. 844 * @serial 845 */ 846 @SuppressWarnings("ProtectedField") 847 protected int fields[]; 848 849 /** 850 * The flags which tell if a specified calendar field for the calendar is set. 851 * A new object has no fields set. After the first call to a method 852 * which generates the fields, they all remain set after that. 853 * This is an array of <code>FIELD_COUNT</code> booleans, with index values 854 * <code>ERA</code> through <code>DST_OFFSET</code>. 855 * @serial 856 */ 857 @SuppressWarnings("ProtectedField") 858 protected boolean isSet[]; 859 860 /** 861 * Pseudo-time-stamps which specify when each field was set. There 862 * are two special values, UNSET and COMPUTED. Values from 863 * MINIMUM_USER_SET to Integer.MAX_VALUE are legal user set values. 864 */ 865 private transient int stamp[]; 866 867 /** 868 * The currently set time for this calendar, expressed in milliseconds after 869 * January 1, 1970, 0:00:00 GMT. 870 * @see #isTimeSet 871 * @serial 872 */ 873 @SuppressWarnings("ProtectedField") 874 protected long time; 875 876 /** 877 * True if then the value of <code>time</code> is valid. 878 * The time is made invalid by a change to an item of <code>field[]</code>. 879 * @see #time 880 * @serial 881 */ 882 @SuppressWarnings("ProtectedField") 883 protected boolean isTimeSet; 884 885 /** 886 * True if <code>fields[]</code> are in sync with the currently set time. 887 * If false, then the next attempt to get the value of a field will 888 * force a recomputation of all fields from the current value of 889 * <code>time</code>. 890 * @serial 891 */ 892 @SuppressWarnings("ProtectedField") 893 protected boolean areFieldsSet; 894 895 /** 896 * True if all fields have been set. 897 * @serial 898 */ 899 transient boolean areAllFieldsSet; 900 901 /** 902 * <code>True</code> if this calendar allows out-of-range field values during computation 903 * of <code>time</code> from <code>fields[]</code>. 904 * @see #setLenient 905 * @see #isLenient 906 * @serial 907 */ 908 private boolean lenient = true; 909 910 /** 911 * The <code>TimeZone</code> used by this calendar. <code>Calendar</code> 912 * uses the time zone data to translate between locale and GMT time. 913 * @serial 914 */ 915 private TimeZone zone; 916 917 /** 918 * <code>True</code> if zone references to a shared TimeZone object. 919 */ 920 private transient boolean sharedZone = false; 921 922 /** 923 * The first day of the week, with possible values <code>SUNDAY</code>, 924 * <code>MONDAY</code>, etc. This is a locale-dependent value. 925 * @serial 926 */ 927 private int firstDayOfWeek; 928 929 /** 930 * The number of days required for the first week in a month or year, 931 * with possible values from 1 to 7. This is a locale-dependent value. 932 * @serial 933 */ 934 private int minimalDaysInFirstWeek; 935 936 /** 937 * Cache to hold the firstDayOfWeek and minimalDaysInFirstWeek 938 * of a Locale. 939 */ 940 private static final ConcurrentMap<Locale, int[]> cachedLocaleData 941 = new ConcurrentHashMap<>(3); 942 943 // Special values of stamp[] 944 /** 945 * The corresponding fields[] has no value. 946 */ 947 private static final int UNSET = 0; 948 949 /** 950 * The value of the corresponding fields[] has been calculated internally. 951 */ 952 private static final int COMPUTED = 1; 953 954 /** 955 * The value of the corresponding fields[] has been set externally. Stamp 956 * values which are greater than 1 represents the (pseudo) time when the 957 * corresponding fields[] value was set. 958 */ 959 private static final int MINIMUM_USER_STAMP = 2; 960 961 /** 962 * The mask value that represents all of the fields. 963 */ 964 static final int ALL_FIELDS = (1 << FIELD_COUNT) - 1; 965 966 /** 967 * The next available value for <code>stamp[]</code>, an internal array. 968 * This actually should not be written out to the stream, and will probably 969 * be removed from the stream in the near future. In the meantime, 970 * a value of <code>MINIMUM_USER_STAMP</code> should be used. 971 * @serial 972 */ 973 private int nextStamp = MINIMUM_USER_STAMP; 974 975 // the internal serial version which says which version was written 976 // - 0 (default) for version up to JDK 1.1.5 977 // - 1 for version from JDK 1.1.6, which writes a correct 'time' value 978 // as well as compatible values for other fields. This is a 979 // transitional format. 980 // - 2 (not implemented yet) a future version, in which fields[], 981 // areFieldsSet, and isTimeSet become transient, and isSet[] is 982 // removed. In JDK 1.1.6 we write a format compatible with version 2. 983 static final int currentSerialVersion = 1; 984 985 /** 986 * The version of the serialized data on the stream. Possible values: 987 * <dl> 988 * <dt><b>0</b> or not present on stream</dt> 989 * <dd> 990 * JDK 1.1.5 or earlier. 991 * </dd> 992 * <dt><b>1</b></dt> 993 * <dd> 994 * JDK 1.1.6 or later. Writes a correct 'time' value 995 * as well as compatible values for other fields. This is a 996 * transitional format. 997 * </dd> 998 * </dl> 999 * When streaming out this class, the most recent format 1000 * and the highest allowable <code>serialVersionOnStream</code> 1001 * is written. 1002 * @serial 1003 * @since 1.1.6 1004 */ 1005 private int serialVersionOnStream = currentSerialVersion; 1006 1007 // Proclaim serialization compatibility with JDK 1.1 1008 static final long serialVersionUID = -1807547505821590642L; 1009 1010 // Mask values for calendar fields 1011 @SuppressWarnings("PointlessBitwiseExpression") 1012 static final int ERA_MASK = (1 << ERA); 1013 static final int YEAR_MASK = (1 << YEAR); 1014 static final int MONTH_MASK = (1 << MONTH); 1015 static final int WEEK_OF_YEAR_MASK = (1 << WEEK_OF_YEAR); 1016 static final int WEEK_OF_MONTH_MASK = (1 << WEEK_OF_MONTH); 1017 static final int DAY_OF_MONTH_MASK = (1 << DAY_OF_MONTH); 1018 static final int DATE_MASK = DAY_OF_MONTH_MASK; 1019 static final int DAY_OF_YEAR_MASK = (1 << DAY_OF_YEAR); 1020 static final int DAY_OF_WEEK_MASK = (1 << DAY_OF_WEEK); 1021 static final int DAY_OF_WEEK_IN_MONTH_MASK = (1 << DAY_OF_WEEK_IN_MONTH); 1022 static final int AM_PM_MASK = (1 << AM_PM); 1023 static final int HOUR_MASK = (1 << HOUR); 1024 static final int HOUR_OF_DAY_MASK = (1 << HOUR_OF_DAY); 1025 static final int MINUTE_MASK = (1 << MINUTE); 1026 static final int SECOND_MASK = (1 << SECOND); 1027 static final int MILLISECOND_MASK = (1 << MILLISECOND); 1028 static final int ZONE_OFFSET_MASK = (1 << ZONE_OFFSET); 1029 static final int DST_OFFSET_MASK = (1 << DST_OFFSET); 1030 1031 /** 1032 * {@code Calendar.Builder} is used for creating a {@code Calendar} from 1033 * various date-time parameters. 1034 * 1035 * <p>There are two ways to set a {@code Calendar} to a date-time value. One 1036 * is to set the instant parameter to a millisecond offset from the <a 1037 * href="Calendar.html#Epoch">Epoch</a>. The other is to set individual 1038 * field parameters, such as {@link Calendar#YEAR YEAR}, to their desired 1039 * values. These two ways can't be mixed. Trying to set both the instant and 1040 * individual fields will cause an {@link IllegalStateException} to be 1041 * thrown. However, it is permitted to override previous values of the 1042 * instant or field parameters. 1043 * 1044 * <p>If no enough field parameters are given for determining date and/or 1045 * time, calendar specific default values are used when building a 1046 * {@code Calendar}. For example, if the {@link Calendar#YEAR YEAR} value 1047 * isn't given for the Gregorian calendar, 1970 will be used. If there are 1048 * any conflicts among field parameters, the <a 1049 * href="Calendar.html#resolution"> resolution rules</a> are applied. 1050 * Therefore, the order of field setting matters. 1051 * 1052 * <p>In addition to the date-time parameters, 1053 * the {@linkplain #setLocale(Locale) locale}, 1054 * {@linkplain #setTimeZone(TimeZone) time zone}, 1055 * {@linkplain #setWeekDefinition(int, int) week definition}, and 1056 * {@linkplain #setLenient(boolean) leniency mode} parameters can be set. 1057 * 1058 * <p><b>Examples</b> 1059 * <p>The following are sample usages. Sample code assumes that the 1060 * {@code Calendar} constants are statically imported. 1061 * 1062 * <p>The following code produces a {@code Calendar} with date 2012-12-31 1063 * (Gregorian) because Monday is the first day of a week with the <a 1064 * href="GregorianCalendar.html#iso8601_compatible_setting"> ISO 8601 1065 * compatible week parameters</a>. 1066 * <pre> 1067 * Calendar cal = new Calendar.Builder().setCalendarType("iso8601") 1068 * .setWeekDate(2013, 1, MONDAY).build();</pre> 1069 * <p>The following code produces a Japanese {@code Calendar} with date 1070 * 1989-01-08 (Gregorian), assuming that the default {@link Calendar#ERA ERA} 1071 * is <em>Heisei</em> that started on that day. 1072 * <pre> 1073 * Calendar cal = new Calendar.Builder().setCalendarType("japanese") 1074 * .setFields(YEAR, 1, DAY_OF_YEAR, 1).build();</pre> 1075 * 1076 * @since 1.8 1077 * @see Calendar#getInstance(TimeZone, Locale) 1078 * @see Calendar#fields 1079 */ 1080 public static class Builder { 1081 private static final int NFIELDS = FIELD_COUNT + 1; // +1 for WEEK_YEAR 1082 private static final int WEEK_YEAR = FIELD_COUNT; 1083 1084 private long instant; 1085 // Calendar.stamp[] (lower half) and Calendar.fields[] (upper half) combined 1086 private int[] fields; 1087 // Pseudo timestamp starting from MINIMUM_USER_STAMP. 1088 // (COMPUTED is used to indicate that the instant has been set.) 1089 private int nextStamp; 1090 // maxFieldIndex keeps the max index of fields which have been set. 1091 // (WEEK_YEAR is never included.) 1092 private int maxFieldIndex; 1093 private String type; 1094 private TimeZone zone; 1095 private boolean lenient = true; 1096 private Locale locale; 1097 private int firstDayOfWeek, minimalDaysInFirstWeek; 1098 1099 /** 1100 * Constructs a {@code Calendar.Builder}. 1101 */ 1102 public Builder() { 1103 } 1104 1105 /** 1106 * Sets the instant parameter to the given {@code instant} value that is 1107 * a millisecond offset from <a href="Calendar.html#Epoch">the 1108 * Epoch</a>. 1109 * 1110 * @param instant a millisecond offset from the Epoch 1111 * @return this {@code Calendar.Builder} 1112 * @throws IllegalStateException if any of the field parameters have 1113 * already been set 1114 * @see Calendar#setTime(Date) 1115 * @see Calendar#setTimeInMillis(long) 1116 * @see Calendar#time 1117 */ 1118 public Builder setInstant(long instant) { 1119 if (fields != null) { 1120 throw new IllegalStateException(); 1121 } 1122 this.instant = instant; 1123 nextStamp = COMPUTED; 1124 return this; 1125 } 1126 1127 /** 1128 * Sets the instant parameter to the {@code instant} value given by a 1129 * {@link Date}. This method is equivalent to a call to 1130 * {@link #setInstant(long) setInstant(instant.getTime())}. 1131 * 1132 * @param instant a {@code Date} representing a millisecond offset from 1133 * the Epoch 1134 * @return this {@code Calendar.Builder} 1135 * @throws NullPointerException if {@code instant} is {@code null} 1136 * @throws IllegalStateException if any of the field parameters have 1137 * already been set 1138 * @see Calendar#setTime(Date) 1139 * @see Calendar#setTimeInMillis(long) 1140 * @see Calendar#time 1141 */ 1142 public Builder setInstant(Date instant) { 1143 return setInstant(instant.getTime()); // NPE if instant == null 1144 } 1145 1146 /** 1147 * Sets the {@code field} parameter to the given {@code value}. 1148 * {@code field} is an index to the {@link Calendar#fields}, such as 1149 * {@link Calendar#DAY_OF_MONTH DAY_OF_MONTH}. Field value validation is 1150 * not performed in this method. Any out of range values are either 1151 * normalized in lenient mode or detected as an invalid value in 1152 * non-lenient mode when building a {@code Calendar}. 1153 * 1154 * @param field an index to the {@code Calendar} fields 1155 * @param value the field value 1156 * @return this {@code Calendar.Builder} 1157 * @throws IllegalArgumentException if {@code field} is invalid 1158 * @throws IllegalStateException if the instant value has already been set, 1159 * or if fields have been set too many 1160 * (approximately {@link Integer#MAX_VALUE}) times. 1161 * @see Calendar#set(int, int) 1162 */ 1163 public Builder set(int field, int value) { 1164 // Note: WEEK_YEAR can't be set with this method. 1165 if (field < 0 || field >= FIELD_COUNT) { 1166 throw new IllegalArgumentException("field is invalid"); 1167 } 1168 if (isInstantSet()) { 1169 throw new IllegalStateException("instant has been set"); 1170 } 1171 allocateFields(); 1172 internalSet(field, value); 1173 return this; 1174 } 1175 1176 /** 1177 * Sets field parameters to their values given by 1178 * {@code fieldValuePairs} that are pairs of a field and its value. 1179 * For example, 1180 * <pre> 1181 * setFields(Calendar.YEAR, 2013, 1182 * Calendar.MONTH, Calendar.DECEMBER, 1183 * Calendar.DAY_OF_MONTH, 23);</pre> 1184 * is equivalent to the sequence of the following 1185 * {@link #set(int, int) set} calls: 1186 * <pre> 1187 * set(Calendar.YEAR, 2013) 1188 * .set(Calendar.MONTH, Calendar.DECEMBER) 1189 * .set(Calendar.DAY_OF_MONTH, 23);</pre> 1190 * 1191 * @param fieldValuePairs field-value pairs 1192 * @return this {@code Calendar.Builder} 1193 * @throws NullPointerException if {@code fieldValuePairs} is {@code null} 1194 * @throws IllegalArgumentException if any of fields are invalid, 1195 * or if {@code fieldValuePairs.length} is an odd number. 1196 * @throws IllegalStateException if the instant value has been set, 1197 * or if fields have been set too many (approximately 1198 * {@link Integer#MAX_VALUE}) times. 1199 */ 1200 public Builder setFields(int... fieldValuePairs) { 1201 int len = fieldValuePairs.length; 1202 if ((len % 2) != 0) { 1203 throw new IllegalArgumentException(); 1204 } 1205 if (isInstantSet()) { 1206 throw new IllegalStateException("instant has been set"); 1207 } 1208 if ((nextStamp + len / 2) < 0) { 1209 throw new IllegalStateException("stamp counter overflow"); 1210 } 1211 allocateFields(); 1212 for (int i = 0; i < len; ) { 1213 int field = fieldValuePairs[i++]; 1214 // Note: WEEK_YEAR can't be set with this method. 1215 if (field < 0 || field >= FIELD_COUNT) { 1216 throw new IllegalArgumentException("field is invalid"); 1217 } 1218 internalSet(field, fieldValuePairs[i++]); 1219 } 1220 return this; 1221 } 1222 1223 /** 1224 * Sets the date field parameters to the values given by {@code year}, 1225 * {@code month}, and {@code dayOfMonth}. This method is equivalent to 1226 * a call to: 1227 * <pre> 1228 * setFields(Calendar.YEAR, year, 1229 * Calendar.MONTH, month, 1230 * Calendar.DAY_OF_MONTH, dayOfMonth);</pre> 1231 * 1232 * @param year the {@link Calendar#YEAR YEAR} value 1233 * @param month the {@link Calendar#MONTH MONTH} value 1234 * (the month numbering is <em>0-based</em>). 1235 * @param dayOfMonth the {@link Calendar#DAY_OF_MONTH DAY_OF_MONTH} value 1236 * @return this {@code Calendar.Builder} 1237 */ 1238 public Builder setDate(int year, int month, int dayOfMonth) { 1239 return setFields(YEAR, year, MONTH, month, DAY_OF_MONTH, dayOfMonth); 1240 } 1241 1242 /** 1243 * Sets the time of day field parameters to the values given by 1244 * {@code hourOfDay}, {@code minute}, and {@code second}. This method is 1245 * equivalent to a call to: 1246 * <pre> 1247 * setTimeOfDay(hourOfDay, minute, second, 0);</pre> 1248 * 1249 * @param hourOfDay the {@link Calendar#HOUR_OF_DAY HOUR_OF_DAY} value 1250 * (24-hour clock) 1251 * @param minute the {@link Calendar#MINUTE MINUTE} value 1252 * @param second the {@link Calendar#SECOND SECOND} value 1253 * @return this {@code Calendar.Builder} 1254 */ 1255 public Builder setTimeOfDay(int hourOfDay, int minute, int second) { 1256 return setTimeOfDay(hourOfDay, minute, second, 0); 1257 } 1258 1259 /** 1260 * Sets the time of day field parameters to the values given by 1261 * {@code hourOfDay}, {@code minute}, {@code second}, and 1262 * {@code millis}. This method is equivalent to a call to: 1263 * <pre> 1264 * setFields(Calendar.HOUR_OF_DAY, hourOfDay, 1265 * Calendar.MINUTE, minute, 1266 * Calendar.SECOND, second, 1267 * Calendar.MILLISECOND, millis);</pre> 1268 * 1269 * @param hourOfDay the {@link Calendar#HOUR_OF_DAY HOUR_OF_DAY} value 1270 * (24-hour clock) 1271 * @param minute the {@link Calendar#MINUTE MINUTE} value 1272 * @param second the {@link Calendar#SECOND SECOND} value 1273 * @param millis the {@link Calendar#MILLISECOND MILLISECOND} value 1274 * @return this {@code Calendar.Builder} 1275 */ 1276 public Builder setTimeOfDay(int hourOfDay, int minute, int second, int millis) { 1277 return setFields(HOUR_OF_DAY, hourOfDay, MINUTE, minute, 1278 SECOND, second, MILLISECOND, millis); 1279 } 1280 1281 /** 1282 * Sets the week-based date parameters to the values with the given 1283 * date specifiers - week year, week of year, and day of week. 1284 * 1285 * <p>If the specified calendar doesn't support week dates, the 1286 * {@link #build() build} method will throw an {@link IllegalArgumentException}. 1287 * 1288 * @param weekYear the week year 1289 * @param weekOfYear the week number based on {@code weekYear} 1290 * @param dayOfWeek the day of week value: one of the constants 1291 * for the {@link Calendar#DAY_OF_WEEK DAY_OF_WEEK} field: 1292 * {@link Calendar#SUNDAY SUNDAY}, ..., {@link Calendar#SATURDAY SATURDAY}. 1293 * @return this {@code Calendar.Builder} 1294 * @see Calendar#setWeekDate(int, int, int) 1295 * @see Calendar#isWeekDateSupported() 1296 */ 1297 public Builder setWeekDate(int weekYear, int weekOfYear, int dayOfWeek) { 1298 allocateFields(); 1299 internalSet(WEEK_YEAR, weekYear); 1300 internalSet(WEEK_OF_YEAR, weekOfYear); 1301 internalSet(DAY_OF_WEEK, dayOfWeek); 1302 return this; 1303 } 1304 1305 /** 1306 * Sets the time zone parameter to the given {@code zone}. If no time 1307 * zone parameter is given to this {@code Calendar.Builder}, the 1308 * {@linkplain TimeZone#getDefault() default 1309 * <code>TimeZone</code>} will be used in the {@link #build() build} 1310 * method. 1311 * 1312 * @param zone the {@link TimeZone} 1313 * @return this {@code Calendar.Builder} 1314 * @throws NullPointerException if {@code zone} is {@code null} 1315 * @see Calendar#setTimeZone(TimeZone) 1316 */ 1317 public Builder setTimeZone(TimeZone zone) { 1318 if (zone == null) { 1319 throw new NullPointerException(); 1320 } 1321 this.zone = zone; 1322 return this; 1323 } 1324 1325 /** 1326 * Sets the lenient mode parameter to the value given by {@code lenient}. 1327 * If no lenient parameter is given to this {@code Calendar.Builder}, 1328 * lenient mode will be used in the {@link #build() build} method. 1329 * 1330 * @param lenient {@code true} for lenient mode; 1331 * {@code false} for non-lenient mode 1332 * @return this {@code Calendar.Builder} 1333 * @see Calendar#setLenient(boolean) 1334 */ 1335 public Builder setLenient(boolean lenient) { 1336 this.lenient = lenient; 1337 return this; 1338 } 1339 1340 /** 1341 * Sets the calendar type parameter to the given {@code type}. The 1342 * calendar type given by this method has precedence over any explicit 1343 * or implicit calendar type given by the 1344 * {@linkplain #setLocale(Locale) locale}. 1345 * 1346 * <p>In addition to the available calendar types returned by the 1347 * {@link Calendar#getAvailableCalendarTypes() Calendar.getAvailableCalendarTypes} 1348 * method, {@code "gregorian"} and {@code "iso8601"} as aliases of 1349 * {@code "gregory"} can be used with this method. 1350 * 1351 * @param type the calendar type 1352 * @return this {@code Calendar.Builder} 1353 * @throws NullPointerException if {@code type} is {@code null} 1354 * @throws IllegalArgumentException if {@code type} is unknown 1355 * @throws IllegalStateException if another calendar type has already been set 1356 * @see Calendar#getCalendarType() 1357 * @see Calendar#getAvailableCalendarTypes() 1358 */ 1359 public Builder setCalendarType(String type) { 1360 if (type.equals("gregorian")) { // NPE if type == null 1361 type = "gregory"; 1362 } 1363 if (!Calendar.getAvailableCalendarTypes().contains(type) 1364 && !type.equals("iso8601")) { 1365 throw new IllegalArgumentException("unknown calendar type: " + type); 1366 } 1367 if (this.type == null) { 1368 this.type = type; 1369 } else { 1370 if (!this.type.equals(type)) { 1371 throw new IllegalStateException("calendar type override"); 1372 } 1373 } 1374 return this; 1375 } 1376 1377 /** 1378 * Sets the locale parameter to the given {@code locale}. If no locale 1379 * is given to this {@code Calendar.Builder}, the {@linkplain 1380 * Locale#getDefault(Locale.Category) default <code>Locale</code>} 1381 * for {@link Locale.Category#FORMAT} will be used. 1382 * 1383 * <p>If no calendar type is explicitly given by a call to the 1384 * {@link #setCalendarType(String) setCalendarType} method, 1385 * the {@code Locale} value is used to determine what type of 1386 * {@code Calendar} to be built. 1387 * 1388 * <p>If no week definition parameters are explicitly given by a call to 1389 * the {@link #setWeekDefinition(int,int) setWeekDefinition} method, the 1390 * {@code Locale}'s default values are used. 1391 * 1392 * @param locale the {@link Locale} 1393 * @throws NullPointerException if {@code locale} is {@code null} 1394 * @return this {@code Calendar.Builder} 1395 * @see Calendar#getInstance(Locale) 1396 */ 1397 public Builder setLocale(Locale locale) { 1398 if (locale == null) { 1399 throw new NullPointerException(); 1400 } 1401 this.locale = locale; 1402 return this; 1403 } 1404 1405 /** 1406 * Sets the week definition parameters to the values given by 1407 * {@code firstDayOfWeek} and {@code minimalDaysInFirstWeek} that are 1408 * used to determine the <a href="Calendar.html#first_week">first 1409 * week</a> of a year. The parameters given by this method have 1410 * precedence over the default values given by the 1411 * {@linkplain #setLocale(Locale) locale}. 1412 * 1413 * @param firstDayOfWeek the first day of a week; one of 1414 * {@link Calendar#SUNDAY} to {@link Calendar#SATURDAY} 1415 * @param minimalDaysInFirstWeek the minimal number of days in the first 1416 * week (1..7) 1417 * @return this {@code Calendar.Builder} 1418 * @throws IllegalArgumentException if {@code firstDayOfWeek} or 1419 * {@code minimalDaysInFirstWeek} is invalid 1420 * @see Calendar#getFirstDayOfWeek() 1421 * @see Calendar#getMinimalDaysInFirstWeek() 1422 */ 1423 public Builder setWeekDefinition(int firstDayOfWeek, int minimalDaysInFirstWeek) { 1424 if (!isValidWeekParameter(firstDayOfWeek) 1425 || !isValidWeekParameter(minimalDaysInFirstWeek)) { 1426 throw new IllegalArgumentException(); 1427 } 1428 this.firstDayOfWeek = firstDayOfWeek; 1429 this.minimalDaysInFirstWeek = minimalDaysInFirstWeek; 1430 return this; 1431 } 1432 1433 /** 1434 * Returns a {@code Calendar} built from the parameters set by the 1435 * setter methods. The calendar type given by the {@link #setCalendarType(String) 1436 * setCalendarType} method or the {@linkplain #setLocale(Locale) locale} is 1437 * used to determine what {@code Calendar} to be created. If no explicit 1438 * calendar type is given, the locale's default calendar is created. 1439 * 1440 * <p>If the calendar type is {@code "iso8601"}, the 1441 * {@linkplain GregorianCalendar#setGregorianChange(Date) Gregorian change date} 1442 * of a {@link GregorianCalendar} is set to {@code Date(Long.MIN_VALUE)} 1443 * to be the <em>proleptic</em> Gregorian calendar. Its week definition 1444 * parameters are also set to be <a 1445 * href="GregorianCalendar.html#iso8601_compatible_setting">compatible 1446 * with the ISO 8601 standard</a>. Note that the 1447 * {@link GregorianCalendar#getCalendarType() getCalendarType} method of 1448 * a {@code GregorianCalendar} created with {@code "iso8601"} returns 1449 * {@code "gregory"}. 1450 * 1451 * <p>The default values are used for locale and time zone if these 1452 * parameters haven't been given explicitly. 1453 * 1454 * <p>Any out of range field values are either normalized in lenient 1455 * mode or detected as an invalid value in non-lenient mode. 1456 * 1457 * @return a {@code Calendar} built with parameters of this {@code 1458 * Calendar.Builder} 1459 * @throws IllegalArgumentException if the calendar type is unknown, or 1460 * if any invalid field values are given in non-lenient mode, or 1461 * if a week date is given for the calendar type that doesn't 1462 * support week dates. 1463 * @see Calendar#getInstance(TimeZone, Locale) 1464 * @see Locale#getDefault(Locale.Category) 1465 * @see TimeZone#getDefault() 1466 */ 1467 public Calendar build() { 1468 if (locale == null) { 1469 locale = Locale.getDefault(); 1470 } 1471 if (zone == null) { 1472 zone = defaultTimeZone(locale); 1473 } 1474 Calendar cal; 1475 if (type == null) { 1476 type = locale.getUnicodeLocaleType("ca"); 1477 } 1478 if (type == null) { 1479 if (locale.getCountry() == "TH" 1480 && locale.getLanguage() == "th") { 1481 type = "buddhist"; 1482 } else { 1483 type = "gregory"; 1484 } 1485 } 1486 switch (type) { 1487 case "gregory": 1488 cal = new GregorianCalendar(zone, locale, true); 1489 break; 1490 case "iso8601": 1491 GregorianCalendar gcal = new GregorianCalendar(zone, locale, true); 1492 // make gcal a proleptic Gregorian 1493 gcal.setGregorianChange(new Date(Long.MIN_VALUE)); 1494 // and week definition to be compatible with ISO 8601 1495 setWeekDefinition(MONDAY, 4); 1496 cal = gcal; 1497 break; 1498 case "buddhist": 1499 cal = new BuddhistCalendar(zone, locale); 1500 cal.clear(); 1501 break; 1502 case "japanese": 1503 cal = new JapaneseImperialCalendar(zone, locale, true); 1504 break; 1505 default: 1506 throw new IllegalArgumentException("unknown calendar type: " + type); 1507 } 1508 cal.setLenient(lenient); 1509 if (firstDayOfWeek != 0) { 1510 cal.setFirstDayOfWeek(firstDayOfWeek); 1511 cal.setMinimalDaysInFirstWeek(minimalDaysInFirstWeek); 1512 } 1513 if (isInstantSet()) { 1514 cal.setTimeInMillis(instant); 1515 cal.complete(); 1516 return cal; 1517 } 1518 1519 if (fields != null) { 1520 boolean weekDate = isSet(WEEK_YEAR) 1521 && fields[WEEK_YEAR] > fields[YEAR]; 1522 if (weekDate && !cal.isWeekDateSupported()) { 1523 throw new IllegalArgumentException("week date is unsupported by " + type); 1524 } 1525 1526 // Set the fields from the min stamp to the max stamp so that 1527 // the fields resolution works in the Calendar. 1528 for (int stamp = MINIMUM_USER_STAMP; stamp < nextStamp; stamp++) { 1529 for (int index = 0; index <= maxFieldIndex; index++) { 1530 if (fields[index] == stamp) { 1531 cal.set(index, fields[NFIELDS + index]); 1532 break; 1533 } 1534 } 1535 } 1536 1537 if (weekDate) { 1538 int weekOfYear = isSet(WEEK_OF_YEAR) ? fields[NFIELDS + WEEK_OF_YEAR] : 1; 1539 int dayOfWeek = isSet(DAY_OF_WEEK) 1540 ? fields[NFIELDS + DAY_OF_WEEK] : cal.getFirstDayOfWeek(); 1541 cal.setWeekDate(fields[NFIELDS + WEEK_YEAR], weekOfYear, dayOfWeek); 1542 } 1543 cal.complete(); 1544 } 1545 1546 return cal; 1547 } 1548 1549 private void allocateFields() { 1550 if (fields == null) { 1551 fields = new int[NFIELDS * 2]; 1552 nextStamp = MINIMUM_USER_STAMP; 1553 maxFieldIndex = -1; 1554 } 1555 } 1556 1557 private void internalSet(int field, int value) { 1558 fields[field] = nextStamp++; 1559 if (nextStamp < 0) { 1560 throw new IllegalStateException("stamp counter overflow"); 1561 } 1562 fields[NFIELDS + field] = value; 1563 if (field > maxFieldIndex && field < WEEK_YEAR) { 1564 maxFieldIndex = field; 1565 } 1566 } 1567 1568 private boolean isInstantSet() { 1569 return nextStamp == COMPUTED; 1570 } 1571 1572 private boolean isSet(int index) { 1573 return fields != null && fields[index] > UNSET; 1574 } 1575 1576 private boolean isValidWeekParameter(int value) { 1577 return value > 0 && value <= 7; 1578 } 1579 } 1580 1581 /** 1582 * Constructs a Calendar with the default time zone 1583 * and the default {@link java.util.Locale.Category#FORMAT FORMAT} 1584 * locale. 1585 * @see TimeZone#getDefault 1586 */ 1587 protected Calendar() 1588 { 1589 this(TimeZone.getDefaultRef(), Locale.getDefault(Locale.Category.FORMAT)); 1590 sharedZone = true; 1591 } 1592 1593 /** 1594 * Constructs a calendar with the specified time zone and locale. 1595 * 1596 * @param zone the time zone to use 1597 * @param aLocale the locale for the week data 1598 */ 1599 protected Calendar(TimeZone zone, Locale aLocale) 1600 { 1601 fields = new int[FIELD_COUNT]; 1602 isSet = new boolean[FIELD_COUNT]; 1603 stamp = new int[FIELD_COUNT]; 1604 1605 this.zone = zone; 1606 setWeekCountData(aLocale); 1607 } 1608 1609 /** 1610 * Gets a calendar using the default time zone and locale. The 1611 * <code>Calendar</code> returned is based on the current time 1612 * in the default time zone with the default 1613 * {@link Locale.Category#FORMAT FORMAT} locale. 1614 * 1615 * @return a Calendar. 1616 */ 1617 public static Calendar getInstance() 1618 { 1619 Locale aLocale = Locale.getDefault(Locale.Category.FORMAT); 1620 return createCalendar(defaultTimeZone(aLocale), aLocale); 1621 } 1622 1623 /** 1624 * Gets a calendar using the specified time zone and default locale. 1625 * The <code>Calendar</code> returned is based on the current time 1626 * in the given time zone with the default 1627 * {@link Locale.Category#FORMAT FORMAT} locale. 1628 * 1629 * @param zone the time zone to use 1630 * @return a Calendar. 1631 */ 1632 public static Calendar getInstance(TimeZone zone) 1633 { 1634 return createCalendar(zone, Locale.getDefault(Locale.Category.FORMAT)); 1635 } 1636 1637 /** 1638 * Gets a calendar using the default time zone and specified locale. 1639 * The <code>Calendar</code> returned is based on the current time 1640 * in the default time zone with the given locale. 1641 * 1642 * @param aLocale the locale for the week data 1643 * @return a Calendar. 1644 */ 1645 public static Calendar getInstance(Locale aLocale) 1646 { 1647 return createCalendar(defaultTimeZone(aLocale), aLocale); 1648 } 1649 1650 /** 1651 * Gets a calendar with the specified time zone and locale. 1652 * The <code>Calendar</code> returned is based on the current time 1653 * in the given time zone with the given locale. 1654 * 1655 * @param zone the time zone to use 1656 * @param aLocale the locale for the week data 1657 * @return a Calendar. 1658 */ 1659 public static Calendar getInstance(TimeZone zone, 1660 Locale aLocale) 1661 { 1662 return createCalendar(zone, aLocale); 1663 } 1664 1665 private static TimeZone defaultTimeZone(Locale l) { 1666 TimeZone defaultTZ = TimeZone.getDefault(); 1667 String shortTZID = l.getUnicodeLocaleType("tz"); 1668 return shortTZID != null ? 1669 TimeZoneNameUtility.convertLDMLShortID(shortTZID) 1670 .map(TimeZone::getTimeZone) 1671 .orElse(defaultTZ) : 1672 defaultTZ; 1673 } 1674 1675 private static Calendar createCalendar(TimeZone zone, 1676 Locale aLocale) 1677 { 1678 CalendarProvider provider = 1679 LocaleProviderAdapter.getAdapter(CalendarProvider.class, aLocale) 1680 .getCalendarProvider(); 1681 if (provider != null) { 1682 try { 1683 return provider.getInstance(zone, aLocale); 1684 } catch (IllegalArgumentException iae) { 1685 // fall back to the default instantiation 1686 } 1687 } 1688 1689 Calendar cal = null; 1690 1691 if (aLocale.hasExtensions()) { 1692 String caltype = aLocale.getUnicodeLocaleType("ca"); 1693 if (caltype != null) { 1694 switch (caltype) { 1695 case "buddhist": 1696 cal = new BuddhistCalendar(zone, aLocale); 1697 break; 1698 case "japanese": 1699 cal = new JapaneseImperialCalendar(zone, aLocale); 1700 break; 1701 case "gregory": 1702 cal = new GregorianCalendar(zone, aLocale); 1703 break; 1704 } 1705 } 1706 } 1707 if (cal == null) { 1708 // If no known calendar type is explicitly specified, 1709 // perform the traditional way to create a Calendar: 1710 // create a BuddhistCalendar for th_TH locale, 1711 // a JapaneseImperialCalendar for ja_JP_JP locale, or 1712 // a GregorianCalendar for any other locales. 1713 // NOTE: The language, country and variant strings are interned. 1714 if (aLocale.getLanguage() == "th" && aLocale.getCountry() == "TH") { 1715 cal = new BuddhistCalendar(zone, aLocale); 1716 } else if (aLocale.getVariant() == "JP" && aLocale.getLanguage() == "ja" 1717 && aLocale.getCountry() == "JP") { 1718 cal = new JapaneseImperialCalendar(zone, aLocale); 1719 } else { 1720 cal = new GregorianCalendar(zone, aLocale); 1721 } 1722 } 1723 return cal; 1724 } 1725 1726 /** 1727 * Returns an array of all locales for which the <code>getInstance</code> 1728 * methods of this class can return localized instances. 1729 * The array returned must contain at least a <code>Locale</code> 1730 * instance equal to {@link java.util.Locale#US Locale.US}. 1731 * 1732 * @return An array of locales for which localized 1733 * <code>Calendar</code> instances are available. 1734 */ 1735 public static synchronized Locale[] getAvailableLocales() 1736 { 1737 return DateFormat.getAvailableLocales(); 1738 } 1739 1740 /** 1741 * Converts the current calendar field values in {@link #fields fields[]} 1742 * to the millisecond time value 1743 * {@link #time}. 1744 * 1745 * @see #complete() 1746 * @see #computeFields() 1747 */ 1748 protected abstract void computeTime(); 1749 1750 /** 1751 * Converts the current millisecond time value {@link #time} 1752 * to calendar field values in {@link #fields fields[]}. 1753 * This allows you to sync up the calendar field values with 1754 * a new time that is set for the calendar. The time is <em>not</em> 1755 * recomputed first; to recompute the time, then the fields, call the 1756 * {@link #complete()} method. 1757 * 1758 * @see #computeTime() 1759 */ 1760 protected abstract void computeFields(); 1761 1762 /** 1763 * Returns a <code>Date</code> object representing this 1764 * <code>Calendar</code>'s time value (millisecond offset from the <a 1765 * href="#Epoch">Epoch</a>"). 1766 * 1767 * @return a <code>Date</code> representing the time value. 1768 * @see #setTime(Date) 1769 * @see #getTimeInMillis() 1770 */ 1771 public final Date getTime() { 1772 return new Date(getTimeInMillis()); 1773 } 1774 1775 /** 1776 * Sets this Calendar's time with the given <code>Date</code>. 1777 * <p> 1778 * Note: Calling <code>setTime()</code> with 1779 * <code>Date(Long.MAX_VALUE)</code> or <code>Date(Long.MIN_VALUE)</code> 1780 * may yield incorrect field values from <code>get()</code>. 1781 * 1782 * @param date the given Date. 1783 * @see #getTime() 1784 * @see #setTimeInMillis(long) 1785 */ 1786 public final void setTime(Date date) { 1787 setTimeInMillis(date.getTime()); 1788 } 1789 1790 /** 1791 * Returns this Calendar's time value in milliseconds. 1792 * 1793 * @return the current time as UTC milliseconds from the epoch. 1794 * @see #getTime() 1795 * @see #setTimeInMillis(long) 1796 */ 1797 public long getTimeInMillis() { 1798 if (!isTimeSet) { 1799 updateTime(); 1800 } 1801 return time; 1802 } 1803 1804 /** 1805 * Sets this Calendar's current time from the given long value. 1806 * 1807 * @param millis the new time in UTC milliseconds from the epoch. 1808 * @see #setTime(Date) 1809 * @see #getTimeInMillis() 1810 */ 1811 public void setTimeInMillis(long millis) { 1812 // If we don't need to recalculate the calendar field values, 1813 // do nothing. 1814 if (time == millis && isTimeSet && areFieldsSet && areAllFieldsSet 1815 && (zone instanceof ZoneInfo) && !((ZoneInfo)zone).isDirty()) { 1816 return; 1817 } 1818 time = millis; 1819 isTimeSet = true; 1820 areFieldsSet = false; 1821 computeFields(); 1822 areAllFieldsSet = areFieldsSet = true; 1823 } 1824 1825 /** 1826 * Returns the value of the given calendar field. In lenient mode, 1827 * all calendar fields are normalized. In non-lenient mode, all 1828 * calendar fields are validated and this method throws an 1829 * exception if any calendar fields have out-of-range values. The 1830 * normalization and validation are handled by the 1831 * {@link #complete()} method, which process is calendar 1832 * system dependent. 1833 * 1834 * @param field the given calendar field. 1835 * @return the value for the given calendar field. 1836 * @throws ArrayIndexOutOfBoundsException if the specified field is out of range 1837 * (<code>field < 0 || field >= FIELD_COUNT</code>). 1838 * @see #set(int,int) 1839 * @see #complete() 1840 */ 1841 public int get(int field) 1842 { 1843 complete(); 1844 return internalGet(field); 1845 } 1846 1847 /** 1848 * Returns the value of the given calendar field. This method does 1849 * not involve normalization or validation of the field value. 1850 * 1851 * @param field the given calendar field. 1852 * @return the value for the given calendar field. 1853 * @see #get(int) 1854 */ 1855 protected final int internalGet(int field) 1856 { 1857 return fields[field]; 1858 } 1859 1860 /** 1861 * Sets the value of the given calendar field. This method does 1862 * not affect any setting state of the field in this 1863 * <code>Calendar</code> instance. 1864 * 1865 * @throws IndexOutOfBoundsException if the specified field is out of range 1866 * (<code>field < 0 || field >= FIELD_COUNT</code>). 1867 * @see #areFieldsSet 1868 * @see #isTimeSet 1869 * @see #areAllFieldsSet 1870 * @see #set(int,int) 1871 */ 1872 final void internalSet(int field, int value) 1873 { 1874 fields[field] = value; 1875 } 1876 1877 /** 1878 * Sets the given calendar field to the given value. The value is not 1879 * interpreted by this method regardless of the leniency mode. 1880 * 1881 * @param field the given calendar field. 1882 * @param value the value to be set for the given calendar field. 1883 * @throws ArrayIndexOutOfBoundsException if the specified field is out of range 1884 * (<code>field < 0 || field >= FIELD_COUNT</code>). 1885 * in non-lenient mode. 1886 * @see #set(int,int,int) 1887 * @see #set(int,int,int,int,int) 1888 * @see #set(int,int,int,int,int,int) 1889 * @see #get(int) 1890 */ 1891 public void set(int field, int value) 1892 { 1893 // If the fields are partially normalized, calculate all the 1894 // fields before changing any fields. 1895 if (areFieldsSet && !areAllFieldsSet) { 1896 computeFields(); 1897 } 1898 internalSet(field, value); 1899 isTimeSet = false; 1900 areFieldsSet = false; 1901 isSet[field] = true; 1902 stamp[field] = nextStamp++; 1903 if (nextStamp == Integer.MAX_VALUE) { 1904 adjustStamp(); 1905 } 1906 } 1907 1908 /** 1909 * Sets the values for the calendar fields <code>YEAR</code>, 1910 * <code>MONTH</code>, and <code>DAY_OF_MONTH</code>. 1911 * Previous values of other calendar fields are retained. If this is not desired, 1912 * call {@link #clear()} first. 1913 * 1914 * @param year the value used to set the <code>YEAR</code> calendar field. 1915 * @param month the value used to set the <code>MONTH</code> calendar field. 1916 * Month value is 0-based. e.g., 0 for January. 1917 * @param date the value used to set the <code>DAY_OF_MONTH</code> calendar field. 1918 * @see #set(int,int) 1919 * @see #set(int,int,int,int,int) 1920 * @see #set(int,int,int,int,int,int) 1921 */ 1922 public final void set(int year, int month, int date) 1923 { 1924 set(YEAR, year); 1925 set(MONTH, month); 1926 set(DATE, date); 1927 } 1928 1929 /** 1930 * Sets the values for the calendar fields <code>YEAR</code>, 1931 * <code>MONTH</code>, <code>DAY_OF_MONTH</code>, 1932 * <code>HOUR_OF_DAY</code>, and <code>MINUTE</code>. 1933 * Previous values of other fields are retained. If this is not desired, 1934 * call {@link #clear()} first. 1935 * 1936 * @param year the value used to set the <code>YEAR</code> calendar field. 1937 * @param month the value used to set the <code>MONTH</code> calendar field. 1938 * Month value is 0-based. e.g., 0 for January. 1939 * @param date the value used to set the <code>DAY_OF_MONTH</code> calendar field. 1940 * @param hourOfDay the value used to set the <code>HOUR_OF_DAY</code> calendar field. 1941 * @param minute the value used to set the <code>MINUTE</code> calendar field. 1942 * @see #set(int,int) 1943 * @see #set(int,int,int) 1944 * @see #set(int,int,int,int,int,int) 1945 */ 1946 public final void set(int year, int month, int date, int hourOfDay, int minute) 1947 { 1948 set(YEAR, year); 1949 set(MONTH, month); 1950 set(DATE, date); 1951 set(HOUR_OF_DAY, hourOfDay); 1952 set(MINUTE, minute); 1953 } 1954 1955 /** 1956 * Sets the values for the fields <code>YEAR</code>, <code>MONTH</code>, 1957 * <code>DAY_OF_MONTH</code>, <code>HOUR_OF_DAY</code>, <code>MINUTE</code>, and 1958 * <code>SECOND</code>. 1959 * Previous values of other fields are retained. If this is not desired, 1960 * call {@link #clear()} first. 1961 * 1962 * @param year the value used to set the <code>YEAR</code> calendar field. 1963 * @param month the value used to set the <code>MONTH</code> calendar field. 1964 * Month value is 0-based. e.g., 0 for January. 1965 * @param date the value used to set the <code>DAY_OF_MONTH</code> calendar field. 1966 * @param hourOfDay the value used to set the <code>HOUR_OF_DAY</code> calendar field. 1967 * @param minute the value used to set the <code>MINUTE</code> calendar field. 1968 * @param second the value used to set the <code>SECOND</code> calendar field. 1969 * @see #set(int,int) 1970 * @see #set(int,int,int) 1971 * @see #set(int,int,int,int,int) 1972 */ 1973 public final void set(int year, int month, int date, int hourOfDay, int minute, 1974 int second) 1975 { 1976 set(YEAR, year); 1977 set(MONTH, month); 1978 set(DATE, date); 1979 set(HOUR_OF_DAY, hourOfDay); 1980 set(MINUTE, minute); 1981 set(SECOND, second); 1982 } 1983 1984 /** 1985 * Sets all the calendar field values and the time value 1986 * (millisecond offset from the <a href="#Epoch">Epoch</a>) of 1987 * this <code>Calendar</code> undefined. This means that {@link 1988 * #isSet(int) isSet()} will return <code>false</code> for all the 1989 * calendar fields, and the date and time calculations will treat 1990 * the fields as if they had never been set. A 1991 * <code>Calendar</code> implementation class may use its specific 1992 * default field values for date/time calculations. For example, 1993 * <code>GregorianCalendar</code> uses 1970 if the 1994 * <code>YEAR</code> field value is undefined. 1995 * 1996 * @see #clear(int) 1997 */ 1998 public final void clear() 1999 { 2000 for (int i = 0; i < fields.length; ) { 2001 stamp[i] = fields[i] = 0; // UNSET == 0 2002 isSet[i++] = false; 2003 } 2004 areAllFieldsSet = areFieldsSet = false; 2005 isTimeSet = false; 2006 } 2007 2008 /** 2009 * Sets the given calendar field value and the time value 2010 * (millisecond offset from the <a href="#Epoch">Epoch</a>) of 2011 * this <code>Calendar</code> undefined. This means that {@link 2012 * #isSet(int) isSet(field)} will return <code>false</code>, and 2013 * the date and time calculations will treat the field as if it 2014 * had never been set. A <code>Calendar</code> implementation 2015 * class may use the field's specific default value for date and 2016 * time calculations. 2017 * 2018 * <p>The {@link #HOUR_OF_DAY}, {@link #HOUR} and {@link #AM_PM} 2019 * fields are handled independently and the <a 2020 * href="#time_resolution">the resolution rule for the time of 2021 * day</a> is applied. Clearing one of the fields doesn't reset 2022 * the hour of day value of this <code>Calendar</code>. Use {@link 2023 * #set(int,int) set(Calendar.HOUR_OF_DAY, 0)} to reset the hour 2024 * value. 2025 * 2026 * @param field the calendar field to be cleared. 2027 * @see #clear() 2028 */ 2029 public final void clear(int field) 2030 { 2031 fields[field] = 0; 2032 stamp[field] = UNSET; 2033 isSet[field] = false; 2034 2035 areAllFieldsSet = areFieldsSet = false; 2036 isTimeSet = false; 2037 } 2038 2039 /** 2040 * Determines if the given calendar field has a value set, 2041 * including cases that the value has been set by internal fields 2042 * calculations triggered by a <code>get</code> method call. 2043 * 2044 * @param field the calendar field to test 2045 * @return <code>true</code> if the given calendar field has a value set; 2046 * <code>false</code> otherwise. 2047 */ 2048 public final boolean isSet(int field) 2049 { 2050 return stamp[field] != UNSET; 2051 } 2052 2053 /** 2054 * Returns the string representation of the calendar 2055 * <code>field</code> value in the given <code>style</code> and 2056 * <code>locale</code>. If no string representation is 2057 * applicable, <code>null</code> is returned. This method calls 2058 * {@link Calendar#get(int) get(field)} to get the calendar 2059 * <code>field</code> value if the string representation is 2060 * applicable to the given calendar <code>field</code>. 2061 * 2062 * <p>For example, if this <code>Calendar</code> is a 2063 * <code>GregorianCalendar</code> and its date is 2005-01-01, then 2064 * the string representation of the {@link #MONTH} field would be 2065 * "January" in the long style in an English locale or "Jan" in 2066 * the short style. However, no string representation would be 2067 * available for the {@link #DAY_OF_MONTH} field, and this method 2068 * would return <code>null</code>. 2069 * 2070 * <p>The default implementation supports the calendar fields for 2071 * which a {@link DateFormatSymbols} has names in the given 2072 * <code>locale</code>. 2073 * 2074 * @param field 2075 * the calendar field for which the string representation 2076 * is returned 2077 * @param style 2078 * the style applied to the string representation; one of {@link 2079 * #SHORT_FORMAT} ({@link #SHORT}), {@link #SHORT_STANDALONE}, 2080 * {@link #LONG_FORMAT} ({@link #LONG}), {@link #LONG_STANDALONE}, 2081 * {@link #NARROW_FORMAT}, or {@link #NARROW_STANDALONE}. 2082 * @param locale 2083 * the locale for the string representation 2084 * (any calendar types specified by {@code locale} are ignored) 2085 * @return the string representation of the given 2086 * {@code field} in the given {@code style}, or 2087 * {@code null} if no string representation is 2088 * applicable. 2089 * @exception IllegalArgumentException 2090 * if {@code field} or {@code style} is invalid, 2091 * or if this {@code Calendar} is non-lenient and any 2092 * of the calendar fields have invalid values 2093 * @exception NullPointerException 2094 * if {@code locale} is null 2095 * @since 1.6 2096 */ 2097 public String getDisplayName(int field, int style, Locale locale) { 2098 if (!checkDisplayNameParams(field, style, SHORT, NARROW_FORMAT, locale, 2099 ERA_MASK|MONTH_MASK|DAY_OF_WEEK_MASK|AM_PM_MASK)) { 2100 return null; 2101 } 2102 2103 String calendarType = getCalendarType(); 2104 int fieldValue = get(field); 2105 // the standalone/narrow styles and short era are supported only through 2106 // CalendarNameProviders. 2107 if (isStandaloneStyle(style) || isNarrowFormatStyle(style) || 2108 field == ERA && (style & SHORT) == SHORT) { 2109 String val = CalendarDataUtility.retrieveFieldValueName(calendarType, 2110 field, fieldValue, 2111 style, locale); 2112 // Perform fallback here to follow the CLDR rules 2113 if (val == null) { 2114 if (isNarrowFormatStyle(style)) { 2115 val = CalendarDataUtility.retrieveFieldValueName(calendarType, 2116 field, fieldValue, 2117 toStandaloneStyle(style), 2118 locale); 2119 } else if (isStandaloneStyle(style)) { 2120 val = CalendarDataUtility.retrieveFieldValueName(calendarType, 2121 field, fieldValue, 2122 getBaseStyle(style), 2123 locale); 2124 } 2125 } 2126 return val; 2127 } 2128 2129 DateFormatSymbols symbols = DateFormatSymbols.getInstance(locale); 2130 String[] strings = getFieldStrings(field, style, symbols); 2131 if (strings != null) { 2132 if (fieldValue < strings.length) { 2133 return strings[fieldValue]; 2134 } 2135 } 2136 return null; 2137 } 2138 2139 /** 2140 * Returns a {@code Map} containing all names of the calendar 2141 * {@code field} in the given {@code style} and 2142 * {@code locale} and their corresponding field values. For 2143 * example, if this {@code Calendar} is a {@link 2144 * GregorianCalendar}, the returned map would contain "Jan" to 2145 * {@link #JANUARY}, "Feb" to {@link #FEBRUARY}, and so on, in the 2146 * {@linkplain #SHORT short} style in an English locale. 2147 * 2148 * <p>Narrow names may not be unique due to use of single characters, 2149 * such as "S" for Sunday and Saturday. In that case narrow names are not 2150 * included in the returned {@code Map}. 2151 * 2152 * <p>The values of other calendar fields may be taken into 2153 * account to determine a set of display names. For example, if 2154 * this {@code Calendar} is a lunisolar calendar system and 2155 * the year value given by the {@link #YEAR} field has a leap 2156 * month, this method would return month names containing the leap 2157 * month name, and month names are mapped to their values specific 2158 * for the year. 2159 * 2160 * <p>The default implementation supports display names contained in 2161 * a {@link DateFormatSymbols}. For example, if {@code field} 2162 * is {@link #MONTH} and {@code style} is {@link 2163 * #ALL_STYLES}, this method returns a {@code Map} containing 2164 * all strings returned by {@link DateFormatSymbols#getShortMonths()} 2165 * and {@link DateFormatSymbols#getMonths()}. 2166 * 2167 * @param field 2168 * the calendar field for which the display names are returned 2169 * @param style 2170 * the style applied to the string representation; one of {@link 2171 * #SHORT_FORMAT} ({@link #SHORT}), {@link #SHORT_STANDALONE}, 2172 * {@link #LONG_FORMAT} ({@link #LONG}), {@link #LONG_STANDALONE}, 2173 * {@link #NARROW_FORMAT}, or {@link #NARROW_STANDALONE} 2174 * @param locale 2175 * the locale for the display names 2176 * @return a {@code Map} containing all display names in 2177 * {@code style} and {@code locale} and their 2178 * field values, or {@code null} if no display names 2179 * are defined for {@code field} 2180 * @exception IllegalArgumentException 2181 * if {@code field} or {@code style} is invalid, 2182 * or if this {@code Calendar} is non-lenient and any 2183 * of the calendar fields have invalid values 2184 * @exception NullPointerException 2185 * if {@code locale} is null 2186 * @since 1.6 2187 */ 2188 public Map<String, Integer> getDisplayNames(int field, int style, Locale locale) { 2189 if (!checkDisplayNameParams(field, style, ALL_STYLES, NARROW_FORMAT, locale, 2190 ERA_MASK|MONTH_MASK|DAY_OF_WEEK_MASK|AM_PM_MASK)) { 2191 return null; 2192 } 2193 2194 String calendarType = getCalendarType(); 2195 if (style == ALL_STYLES || isStandaloneStyle(style) || isNarrowFormatStyle(style)) { 2196 Map<String, Integer> map; 2197 map = CalendarDataUtility.retrieveFieldValueNames(calendarType, field, style, locale); 2198 2199 // Perform fallback here to follow the CLDR rules 2200 if (map == null) { 2201 if (isNarrowFormatStyle(style)) { 2202 map = CalendarDataUtility.retrieveFieldValueNames(calendarType, field, 2203 toStandaloneStyle(style), locale); 2204 } else if (style != ALL_STYLES) { 2205 map = CalendarDataUtility.retrieveFieldValueNames(calendarType, field, 2206 getBaseStyle(style), locale); 2207 } 2208 } 2209 return map; 2210 } 2211 2212 // SHORT or LONG 2213 return getDisplayNamesImpl(field, style, locale); 2214 } 2215 2216 private Map<String,Integer> getDisplayNamesImpl(int field, int style, Locale locale) { 2217 DateFormatSymbols symbols = DateFormatSymbols.getInstance(locale); 2218 String[] strings = getFieldStrings(field, style, symbols); 2219 if (strings != null) { 2220 Map<String,Integer> names = new HashMap<>(); 2221 for (int i = 0; i < strings.length; i++) { 2222 if (strings[i].length() == 0) { 2223 continue; 2224 } 2225 names.put(strings[i], i); 2226 } 2227 return names; 2228 } 2229 return null; 2230 } 2231 2232 boolean checkDisplayNameParams(int field, int style, int minStyle, int maxStyle, 2233 Locale locale, int fieldMask) { 2234 int baseStyle = getBaseStyle(style); // Ignore the standalone mask 2235 if (field < 0 || field >= fields.length || 2236 baseStyle < minStyle || baseStyle > maxStyle || baseStyle == 3) { 2237 throw new IllegalArgumentException(); 2238 } 2239 if (locale == null) { 2240 throw new NullPointerException(); 2241 } 2242 return isFieldSet(fieldMask, field); 2243 } 2244 2245 private String[] getFieldStrings(int field, int style, DateFormatSymbols symbols) { 2246 int baseStyle = getBaseStyle(style); // ignore the standalone mask 2247 2248 // DateFormatSymbols doesn't support any narrow names. 2249 if (baseStyle == NARROW_FORMAT) { 2250 return null; 2251 } 2252 2253 String[] strings = null; 2254 switch (field) { 2255 case ERA: 2256 strings = symbols.getEras(); 2257 break; 2258 2259 case MONTH: 2260 strings = (baseStyle == LONG) ? symbols.getMonths() : symbols.getShortMonths(); 2261 break; 2262 2263 case DAY_OF_WEEK: 2264 strings = (baseStyle == LONG) ? symbols.getWeekdays() : symbols.getShortWeekdays(); 2265 break; 2266 2267 case AM_PM: 2268 strings = symbols.getAmPmStrings(); 2269 break; 2270 } 2271 return strings; 2272 } 2273 2274 /** 2275 * Fills in any unset fields in the calendar fields. First, the {@link 2276 * #computeTime()} method is called if the time value (millisecond offset 2277 * from the <a href="#Epoch">Epoch</a>) has not been calculated from 2278 * calendar field values. Then, the {@link #computeFields()} method is 2279 * called to calculate all calendar field values. 2280 */ 2281 protected void complete() 2282 { 2283 if (!isTimeSet) { 2284 updateTime(); 2285 } 2286 if (!areFieldsSet || !areAllFieldsSet) { 2287 computeFields(); // fills in unset fields 2288 areAllFieldsSet = areFieldsSet = true; 2289 } 2290 } 2291 2292 /** 2293 * Returns whether the value of the specified calendar field has been set 2294 * externally by calling one of the setter methods rather than by the 2295 * internal time calculation. 2296 * 2297 * @return <code>true</code> if the field has been set externally, 2298 * <code>false</code> otherwise. 2299 * @exception IndexOutOfBoundsException if the specified 2300 * <code>field</code> is out of range 2301 * (<code>field < 0 || field >= FIELD_COUNT</code>). 2302 * @see #selectFields() 2303 * @see #setFieldsComputed(int) 2304 */ 2305 final boolean isExternallySet(int field) { 2306 return stamp[field] >= MINIMUM_USER_STAMP; 2307 } 2308 2309 /** 2310 * Returns a field mask (bit mask) indicating all calendar fields that 2311 * have the state of externally or internally set. 2312 * 2313 * @return a bit mask indicating set state fields 2314 */ 2315 final int getSetStateFields() { 2316 int mask = 0; 2317 for (int i = 0; i < fields.length; i++) { 2318 if (stamp[i] != UNSET) { 2319 mask |= 1 << i; 2320 } 2321 } 2322 return mask; 2323 } 2324 2325 /** 2326 * Sets the state of the specified calendar fields to 2327 * <em>computed</em>. This state means that the specified calendar fields 2328 * have valid values that have been set by internal time calculation 2329 * rather than by calling one of the setter methods. 2330 * 2331 * @param fieldMask the field to be marked as computed. 2332 * @exception IndexOutOfBoundsException if the specified 2333 * <code>field</code> is out of range 2334 * (<code>field < 0 || field >= FIELD_COUNT</code>). 2335 * @see #isExternallySet(int) 2336 * @see #selectFields() 2337 */ 2338 final void setFieldsComputed(int fieldMask) { 2339 if (fieldMask == ALL_FIELDS) { 2340 for (int i = 0; i < fields.length; i++) { 2341 stamp[i] = COMPUTED; 2342 isSet[i] = true; 2343 } 2344 areFieldsSet = areAllFieldsSet = true; 2345 } else { 2346 for (int i = 0; i < fields.length; i++) { 2347 if ((fieldMask & 1) == 1) { 2348 stamp[i] = COMPUTED; 2349 isSet[i] = true; 2350 } else { 2351 if (areAllFieldsSet && !isSet[i]) { 2352 areAllFieldsSet = false; 2353 } 2354 } 2355 fieldMask >>>= 1; 2356 } 2357 } 2358 } 2359 2360 /** 2361 * Sets the state of the calendar fields that are <em>not</em> specified 2362 * by <code>fieldMask</code> to <em>unset</em>. If <code>fieldMask</code> 2363 * specifies all the calendar fields, then the state of this 2364 * <code>Calendar</code> becomes that all the calendar fields are in sync 2365 * with the time value (millisecond offset from the Epoch). 2366 * 2367 * @param fieldMask the field mask indicating which calendar fields are in 2368 * sync with the time value. 2369 * @exception IndexOutOfBoundsException if the specified 2370 * <code>field</code> is out of range 2371 * (<code>field < 0 || field >= FIELD_COUNT</code>). 2372 * @see #isExternallySet(int) 2373 * @see #selectFields() 2374 */ 2375 final void setFieldsNormalized(int fieldMask) { 2376 if (fieldMask != ALL_FIELDS) { 2377 for (int i = 0; i < fields.length; i++) { 2378 if ((fieldMask & 1) == 0) { 2379 stamp[i] = fields[i] = 0; // UNSET == 0 2380 isSet[i] = false; 2381 } 2382 fieldMask >>= 1; 2383 } 2384 } 2385 2386 // Some or all of the fields are in sync with the 2387 // milliseconds, but the stamp values are not normalized yet. 2388 areFieldsSet = true; 2389 areAllFieldsSet = false; 2390 } 2391 2392 /** 2393 * Returns whether the calendar fields are partially in sync with the time 2394 * value or fully in sync but not stamp values are not normalized yet. 2395 */ 2396 final boolean isPartiallyNormalized() { 2397 return areFieldsSet && !areAllFieldsSet; 2398 } 2399 2400 /** 2401 * Returns whether the calendar fields are fully in sync with the time 2402 * value. 2403 */ 2404 final boolean isFullyNormalized() { 2405 return areFieldsSet && areAllFieldsSet; 2406 } 2407 2408 /** 2409 * Marks this Calendar as not sync'd. 2410 */ 2411 final void setUnnormalized() { 2412 areFieldsSet = areAllFieldsSet = false; 2413 } 2414 2415 /** 2416 * Returns whether the specified <code>field</code> is on in the 2417 * <code>fieldMask</code>. 2418 */ 2419 static boolean isFieldSet(int fieldMask, int field) { 2420 return (fieldMask & (1 << field)) != 0; 2421 } 2422 2423 /** 2424 * Returns a field mask indicating which calendar field values 2425 * to be used to calculate the time value. The calendar fields are 2426 * returned as a bit mask, each bit of which corresponds to a field, i.e., 2427 * the mask value of <code>field</code> is <code>(1 << 2428 * field)</code>. For example, 0x26 represents the <code>YEAR</code>, 2429 * <code>MONTH</code>, and <code>DAY_OF_MONTH</code> fields (i.e., 0x26 is 2430 * equal to 2431 * <code>(1<<YEAR)|(1<<MONTH)|(1<<DAY_OF_MONTH))</code>. 2432 * 2433 * <p>This method supports the calendar fields resolution as described in 2434 * the class description. If the bit mask for a given field is on and its 2435 * field has not been set (i.e., <code>isSet(field)</code> is 2436 * <code>false</code>), then the default value of the field has to be 2437 * used, which case means that the field has been selected because the 2438 * selected combination involves the field. 2439 * 2440 * @return a bit mask of selected fields 2441 * @see #isExternallySet(int) 2442 */ 2443 final int selectFields() { 2444 // This implementation has been taken from the GregorianCalendar class. 2445 2446 // The YEAR field must always be used regardless of its SET 2447 // state because YEAR is a mandatory field to determine the date 2448 // and the default value (EPOCH_YEAR) may change through the 2449 // normalization process. 2450 int fieldMask = YEAR_MASK; 2451 2452 if (stamp[ERA] != UNSET) { 2453 fieldMask |= ERA_MASK; 2454 } 2455 // Find the most recent group of fields specifying the day within 2456 // the year. These may be any of the following combinations: 2457 // MONTH + DAY_OF_MONTH 2458 // MONTH + WEEK_OF_MONTH + DAY_OF_WEEK 2459 // MONTH + DAY_OF_WEEK_IN_MONTH + DAY_OF_WEEK 2460 // DAY_OF_YEAR 2461 // WEEK_OF_YEAR + DAY_OF_WEEK 2462 // We look for the most recent of the fields in each group to determine 2463 // the age of the group. For groups involving a week-related field such 2464 // as WEEK_OF_MONTH, DAY_OF_WEEK_IN_MONTH, or WEEK_OF_YEAR, both the 2465 // week-related field and the DAY_OF_WEEK must be set for the group as a 2466 // whole to be considered. (See bug 4153860 - liu 7/24/98.) 2467 int dowStamp = stamp[DAY_OF_WEEK]; 2468 int monthStamp = stamp[MONTH]; 2469 int domStamp = stamp[DAY_OF_MONTH]; 2470 int womStamp = aggregateStamp(stamp[WEEK_OF_MONTH], dowStamp); 2471 int dowimStamp = aggregateStamp(stamp[DAY_OF_WEEK_IN_MONTH], dowStamp); 2472 int doyStamp = stamp[DAY_OF_YEAR]; 2473 int woyStamp = aggregateStamp(stamp[WEEK_OF_YEAR], dowStamp); 2474 2475 int bestStamp = domStamp; 2476 if (womStamp > bestStamp) { 2477 bestStamp = womStamp; 2478 } 2479 if (dowimStamp > bestStamp) { 2480 bestStamp = dowimStamp; 2481 } 2482 if (doyStamp > bestStamp) { 2483 bestStamp = doyStamp; 2484 } 2485 if (woyStamp > bestStamp) { 2486 bestStamp = woyStamp; 2487 } 2488 2489 /* No complete combination exists. Look for WEEK_OF_MONTH, 2490 * DAY_OF_WEEK_IN_MONTH, or WEEK_OF_YEAR alone. Treat DAY_OF_WEEK alone 2491 * as DAY_OF_WEEK_IN_MONTH. 2492 */ 2493 if (bestStamp == UNSET) { 2494 womStamp = stamp[WEEK_OF_MONTH]; 2495 dowimStamp = Math.max(stamp[DAY_OF_WEEK_IN_MONTH], dowStamp); 2496 woyStamp = stamp[WEEK_OF_YEAR]; 2497 bestStamp = Math.max(Math.max(womStamp, dowimStamp), woyStamp); 2498 2499 /* Treat MONTH alone or no fields at all as DAY_OF_MONTH. This may 2500 * result in bestStamp = domStamp = UNSET if no fields are set, 2501 * which indicates DAY_OF_MONTH. 2502 */ 2503 if (bestStamp == UNSET) { 2504 bestStamp = domStamp = monthStamp; 2505 } 2506 } 2507 2508 if (bestStamp == domStamp || 2509 (bestStamp == womStamp && stamp[WEEK_OF_MONTH] >= stamp[WEEK_OF_YEAR]) || 2510 (bestStamp == dowimStamp && stamp[DAY_OF_WEEK_IN_MONTH] >= stamp[WEEK_OF_YEAR])) { 2511 fieldMask |= MONTH_MASK; 2512 if (bestStamp == domStamp) { 2513 fieldMask |= DAY_OF_MONTH_MASK; 2514 } else { 2515 assert (bestStamp == womStamp || bestStamp == dowimStamp); 2516 if (dowStamp != UNSET) { 2517 fieldMask |= DAY_OF_WEEK_MASK; 2518 } 2519 if (womStamp == dowimStamp) { 2520 // When they are equal, give the priority to 2521 // WEEK_OF_MONTH for compatibility. 2522 if (stamp[WEEK_OF_MONTH] >= stamp[DAY_OF_WEEK_IN_MONTH]) { 2523 fieldMask |= WEEK_OF_MONTH_MASK; 2524 } else { 2525 fieldMask |= DAY_OF_WEEK_IN_MONTH_MASK; 2526 } 2527 } else { 2528 if (bestStamp == womStamp) { 2529 fieldMask |= WEEK_OF_MONTH_MASK; 2530 } else { 2531 assert (bestStamp == dowimStamp); 2532 if (stamp[DAY_OF_WEEK_IN_MONTH] != UNSET) { 2533 fieldMask |= DAY_OF_WEEK_IN_MONTH_MASK; 2534 } 2535 } 2536 } 2537 } 2538 } else { 2539 assert (bestStamp == doyStamp || bestStamp == woyStamp || 2540 bestStamp == UNSET); 2541 if (bestStamp == doyStamp) { 2542 fieldMask |= DAY_OF_YEAR_MASK; 2543 } else { 2544 assert (bestStamp == woyStamp); 2545 if (dowStamp != UNSET) { 2546 fieldMask |= DAY_OF_WEEK_MASK; 2547 } 2548 fieldMask |= WEEK_OF_YEAR_MASK; 2549 } 2550 } 2551 2552 // Find the best set of fields specifying the time of day. There 2553 // are only two possibilities here; the HOUR_OF_DAY or the 2554 // AM_PM and the HOUR. 2555 int hourOfDayStamp = stamp[HOUR_OF_DAY]; 2556 int hourStamp = aggregateStamp(stamp[HOUR], stamp[AM_PM]); 2557 bestStamp = (hourStamp > hourOfDayStamp) ? hourStamp : hourOfDayStamp; 2558 2559 // if bestStamp is still UNSET, then take HOUR or AM_PM. (See 4846659) 2560 if (bestStamp == UNSET) { 2561 bestStamp = Math.max(stamp[HOUR], stamp[AM_PM]); 2562 } 2563 2564 // Hours 2565 if (bestStamp != UNSET) { 2566 if (bestStamp == hourOfDayStamp) { 2567 fieldMask |= HOUR_OF_DAY_MASK; 2568 } else { 2569 fieldMask |= HOUR_MASK; 2570 if (stamp[AM_PM] != UNSET) { 2571 fieldMask |= AM_PM_MASK; 2572 } 2573 } 2574 } 2575 if (stamp[MINUTE] != UNSET) { 2576 fieldMask |= MINUTE_MASK; 2577 } 2578 if (stamp[SECOND] != UNSET) { 2579 fieldMask |= SECOND_MASK; 2580 } 2581 if (stamp[MILLISECOND] != UNSET) { 2582 fieldMask |= MILLISECOND_MASK; 2583 } 2584 if (stamp[ZONE_OFFSET] >= MINIMUM_USER_STAMP) { 2585 fieldMask |= ZONE_OFFSET_MASK; 2586 } 2587 if (stamp[DST_OFFSET] >= MINIMUM_USER_STAMP) { 2588 fieldMask |= DST_OFFSET_MASK; 2589 } 2590 2591 return fieldMask; 2592 } 2593 2594 int getBaseStyle(int style) { 2595 return style & ~STANDALONE_MASK; 2596 } 2597 2598 private int toStandaloneStyle(int style) { 2599 return style | STANDALONE_MASK; 2600 } 2601 2602 private boolean isStandaloneStyle(int style) { 2603 return (style & STANDALONE_MASK) != 0; 2604 } 2605 2606 private boolean isNarrowStyle(int style) { 2607 return style == NARROW_FORMAT || style == NARROW_STANDALONE; 2608 } 2609 2610 private boolean isNarrowFormatStyle(int style) { 2611 return style == NARROW_FORMAT; 2612 } 2613 2614 /** 2615 * Returns the pseudo-time-stamp for two fields, given their 2616 * individual pseudo-time-stamps. If either of the fields 2617 * is unset, then the aggregate is unset. Otherwise, the 2618 * aggregate is the later of the two stamps. 2619 */ 2620 private static int aggregateStamp(int stamp_a, int stamp_b) { 2621 if (stamp_a == UNSET || stamp_b == UNSET) { 2622 return UNSET; 2623 } 2624 return (stamp_a > stamp_b) ? stamp_a : stamp_b; 2625 } 2626 2627 /** 2628 * Returns an unmodifiable {@code Set} containing all calendar types 2629 * supported by {@code Calendar} in the runtime environment. The available 2630 * calendar types can be used for the <a 2631 * href="Locale.html#def_locale_extension">Unicode locale extensions</a>. 2632 * The {@code Set} returned contains at least {@code "gregory"}. The 2633 * calendar types don't include aliases, such as {@code "gregorian"} for 2634 * {@code "gregory"}. 2635 * 2636 * @return an unmodifiable {@code Set} containing all available calendar types 2637 * @since 1.8 2638 * @see #getCalendarType() 2639 * @see Calendar.Builder#setCalendarType(String) 2640 * @see Locale#getUnicodeLocaleType(String) 2641 */ 2642 public static Set<String> getAvailableCalendarTypes() { 2643 return AvailableCalendarTypes.SET; 2644 } 2645 2646 private static class AvailableCalendarTypes { 2647 private static final Set<String> SET; 2648 static { 2649 Set<String> set = new HashSet<>(3); 2650 set.add("gregory"); 2651 set.add("buddhist"); 2652 set.add("japanese"); 2653 SET = Collections.unmodifiableSet(set); 2654 } 2655 private AvailableCalendarTypes() { 2656 } 2657 } 2658 2659 /** 2660 * Returns the calendar type of this {@code Calendar}. Calendar types are 2661 * defined by the <em>Unicode Locale Data Markup Language (LDML)</em> 2662 * specification. 2663 * 2664 * <p>The default implementation of this method returns the class name of 2665 * this {@code Calendar} instance. Any subclasses that implement 2666 * LDML-defined calendar systems should override this method to return 2667 * appropriate calendar types. 2668 * 2669 * @return the LDML-defined calendar type or the class name of this 2670 * {@code Calendar} instance 2671 * @since 1.8 2672 * @see <a href="Locale.html#def_extensions">Locale extensions</a> 2673 * @see Locale.Builder#setLocale(Locale) 2674 * @see Locale.Builder#setUnicodeLocaleKeyword(String, String) 2675 */ 2676 public String getCalendarType() { 2677 return this.getClass().getName(); 2678 } 2679 2680 /** 2681 * Compares this <code>Calendar</code> to the specified 2682 * <code>Object</code>. The result is <code>true</code> if and only if 2683 * the argument is a <code>Calendar</code> object of the same calendar 2684 * system that represents the same time value (millisecond offset from the 2685 * <a href="#Epoch">Epoch</a>) under the same 2686 * <code>Calendar</code> parameters as this object. 2687 * 2688 * <p>The <code>Calendar</code> parameters are the values represented 2689 * by the <code>isLenient</code>, <code>getFirstDayOfWeek</code>, 2690 * <code>getMinimalDaysInFirstWeek</code> and <code>getTimeZone</code> 2691 * methods. If there is any difference in those parameters 2692 * between the two <code>Calendar</code>s, this method returns 2693 * <code>false</code>. 2694 * 2695 * <p>Use the {@link #compareTo(Calendar) compareTo} method to 2696 * compare only the time values. 2697 * 2698 * @param obj the object to compare with. 2699 * @return <code>true</code> if this object is equal to <code>obj</code>; 2700 * <code>false</code> otherwise. 2701 */ 2702 @SuppressWarnings("EqualsWhichDoesntCheckParameterClass") 2703 @Override 2704 public boolean equals(Object obj) { 2705 if (this == obj) { 2706 return true; 2707 } 2708 try { 2709 Calendar that = (Calendar)obj; 2710 return compareTo(getMillisOf(that)) == 0 && 2711 lenient == that.lenient && 2712 firstDayOfWeek == that.firstDayOfWeek && 2713 minimalDaysInFirstWeek == that.minimalDaysInFirstWeek && 2714 zone.equals(that.zone); 2715 } catch (Exception e) { 2716 // Note: GregorianCalendar.computeTime throws 2717 // IllegalArgumentException if the ERA value is invalid 2718 // even it's in lenient mode. 2719 } 2720 return false; 2721 } 2722 2723 /** 2724 * Returns a hash code for this calendar. 2725 * 2726 * @return a hash code value for this object. 2727 * @since 1.2 2728 */ 2729 @Override 2730 public int hashCode() { 2731 // 'otheritems' represents the hash code for the previous versions. 2732 int otheritems = (lenient ? 1 : 0) 2733 | (firstDayOfWeek << 1) 2734 | (minimalDaysInFirstWeek << 4) 2735 | (zone.hashCode() << 7); 2736 long t = getMillisOf(this); 2737 return (int) t ^ (int)(t >> 32) ^ otheritems; 2738 } 2739 2740 /** 2741 * Returns whether this <code>Calendar</code> represents a time 2742 * before the time represented by the specified 2743 * <code>Object</code>. This method is equivalent to: 2744 * <pre>{@code 2745 * compareTo(when) < 0 2746 * }</pre> 2747 * if and only if <code>when</code> is a <code>Calendar</code> 2748 * instance. Otherwise, the method returns <code>false</code>. 2749 * 2750 * @param when the <code>Object</code> to be compared 2751 * @return <code>true</code> if the time of this 2752 * <code>Calendar</code> is before the time represented by 2753 * <code>when</code>; <code>false</code> otherwise. 2754 * @see #compareTo(Calendar) 2755 */ 2756 public boolean before(Object when) { 2757 return when instanceof Calendar 2758 && compareTo((Calendar)when) < 0; 2759 } 2760 2761 /** 2762 * Returns whether this <code>Calendar</code> represents a time 2763 * after the time represented by the specified 2764 * <code>Object</code>. This method is equivalent to: 2765 * <pre>{@code 2766 * compareTo(when) > 0 2767 * }</pre> 2768 * if and only if <code>when</code> is a <code>Calendar</code> 2769 * instance. Otherwise, the method returns <code>false</code>. 2770 * 2771 * @param when the <code>Object</code> to be compared 2772 * @return <code>true</code> if the time of this <code>Calendar</code> is 2773 * after the time represented by <code>when</code>; <code>false</code> 2774 * otherwise. 2775 * @see #compareTo(Calendar) 2776 */ 2777 public boolean after(Object when) { 2778 return when instanceof Calendar 2779 && compareTo((Calendar)when) > 0; 2780 } 2781 2782 /** 2783 * Compares the time values (millisecond offsets from the <a 2784 * href="#Epoch">Epoch</a>) represented by two 2785 * <code>Calendar</code> objects. 2786 * 2787 * @param anotherCalendar the <code>Calendar</code> to be compared. 2788 * @return the value <code>0</code> if the time represented by the argument 2789 * is equal to the time represented by this <code>Calendar</code>; a value 2790 * less than <code>0</code> if the time of this <code>Calendar</code> is 2791 * before the time represented by the argument; and a value greater than 2792 * <code>0</code> if the time of this <code>Calendar</code> is after the 2793 * time represented by the argument. 2794 * @exception NullPointerException if the specified <code>Calendar</code> is 2795 * <code>null</code>. 2796 * @exception IllegalArgumentException if the time value of the 2797 * specified <code>Calendar</code> object can't be obtained due to 2798 * any invalid calendar values. 2799 * @since 1.5 2800 */ 2801 @Override 2802 public int compareTo(Calendar anotherCalendar) { 2803 return compareTo(getMillisOf(anotherCalendar)); 2804 } 2805 2806 /** 2807 * Adds or subtracts the specified amount of time to the given calendar field, 2808 * based on the calendar's rules. For example, to subtract 5 days from 2809 * the current time of the calendar, you can achieve it by calling: 2810 * <p><code>add(Calendar.DAY_OF_MONTH, -5)</code>. 2811 * 2812 * @param field the calendar field. 2813 * @param amount the amount of date or time to be added to the field. 2814 * @see #roll(int,int) 2815 * @see #set(int,int) 2816 */ 2817 public abstract void add(int field, int amount); 2818 2819 /** 2820 * Adds or subtracts (up/down) a single unit of time on the given time 2821 * field without changing larger fields. For example, to roll the current 2822 * date up by one day, you can achieve it by calling: 2823 * <p>roll(Calendar.DATE, true). 2824 * When rolling on the year or Calendar.YEAR field, it will roll the year 2825 * value in the range between 1 and the value returned by calling 2826 * <code>getMaximum(Calendar.YEAR)</code>. 2827 * When rolling on the month or Calendar.MONTH field, other fields like 2828 * date might conflict and, need to be changed. For instance, 2829 * rolling the month on the date 01/31/96 will result in 02/29/96. 2830 * When rolling on the hour-in-day or Calendar.HOUR_OF_DAY field, it will 2831 * roll the hour value in the range between 0 and 23, which is zero-based. 2832 * 2833 * @param field the time field. 2834 * @param up indicates if the value of the specified time field is to be 2835 * rolled up or rolled down. Use true if rolling up, false otherwise. 2836 * @see Calendar#add(int,int) 2837 * @see Calendar#set(int,int) 2838 */ 2839 public abstract void roll(int field, boolean up); 2840 2841 /** 2842 * Adds the specified (signed) amount to the specified calendar field 2843 * without changing larger fields. A negative amount means to roll 2844 * down. 2845 * 2846 * <p>NOTE: This default implementation on <code>Calendar</code> just repeatedly calls the 2847 * version of {@link #roll(int,boolean) roll()} that rolls by one unit. This may not 2848 * always do the right thing. For example, if the <code>DAY_OF_MONTH</code> field is 31, 2849 * rolling through February will leave it set to 28. The <code>GregorianCalendar</code> 2850 * version of this function takes care of this problem. Other subclasses 2851 * should also provide overrides of this function that do the right thing. 2852 * 2853 * @param field the calendar field. 2854 * @param amount the signed amount to add to the calendar <code>field</code>. 2855 * @since 1.2 2856 * @see #roll(int,boolean) 2857 * @see #add(int,int) 2858 * @see #set(int,int) 2859 */ 2860 public void roll(int field, int amount) 2861 { 2862 while (amount > 0) { 2863 roll(field, true); 2864 amount--; 2865 } 2866 while (amount < 0) { 2867 roll(field, false); 2868 amount++; 2869 } 2870 } 2871 2872 /** 2873 * Sets the time zone with the given time zone value. 2874 * 2875 * @param value the given time zone. 2876 */ 2877 public void setTimeZone(TimeZone value) 2878 { 2879 zone = value; 2880 sharedZone = false; 2881 /* Recompute the fields from the time using the new zone. This also 2882 * works if isTimeSet is false (after a call to set()). In that case 2883 * the time will be computed from the fields using the new zone, then 2884 * the fields will get recomputed from that. Consider the sequence of 2885 * calls: cal.setTimeZone(EST); cal.set(HOUR, 1); cal.setTimeZone(PST). 2886 * Is cal set to 1 o'clock EST or 1 o'clock PST? Answer: PST. More 2887 * generally, a call to setTimeZone() affects calls to set() BEFORE AND 2888 * AFTER it up to the next call to complete(). 2889 */ 2890 areAllFieldsSet = areFieldsSet = false; 2891 } 2892 2893 /** 2894 * Gets the time zone. 2895 * 2896 * @return the time zone object associated with this calendar. 2897 */ 2898 public TimeZone getTimeZone() 2899 { 2900 // If the TimeZone object is shared by other Calendar instances, then 2901 // create a clone. 2902 if (sharedZone) { 2903 zone = (TimeZone) zone.clone(); 2904 sharedZone = false; 2905 } 2906 return zone; 2907 } 2908 2909 /** 2910 * Returns the time zone (without cloning). 2911 */ 2912 TimeZone getZone() { 2913 return zone; 2914 } 2915 2916 /** 2917 * Sets the sharedZone flag to <code>shared</code>. 2918 */ 2919 void setZoneShared(boolean shared) { 2920 sharedZone = shared; 2921 } 2922 2923 /** 2924 * Specifies whether or not date/time interpretation is to be lenient. With 2925 * lenient interpretation, a date such as "February 942, 1996" will be 2926 * treated as being equivalent to the 941st day after February 1, 1996. 2927 * With strict (non-lenient) interpretation, such dates will cause an exception to be 2928 * thrown. The default is lenient. 2929 * 2930 * @param lenient <code>true</code> if the lenient mode is to be turned 2931 * on; <code>false</code> if it is to be turned off. 2932 * @see #isLenient() 2933 * @see java.text.DateFormat#setLenient 2934 */ 2935 public void setLenient(boolean lenient) 2936 { 2937 this.lenient = lenient; 2938 } 2939 2940 /** 2941 * Tells whether date/time interpretation is to be lenient. 2942 * 2943 * @return <code>true</code> if the interpretation mode of this calendar is lenient; 2944 * <code>false</code> otherwise. 2945 * @see #setLenient(boolean) 2946 */ 2947 public boolean isLenient() 2948 { 2949 return lenient; 2950 } 2951 2952 /** 2953 * Sets what the first day of the week is; e.g., <code>SUNDAY</code> in the U.S., 2954 * <code>MONDAY</code> in France. 2955 * 2956 * @param value the given first day of the week. 2957 * @see #getFirstDayOfWeek() 2958 * @see #getMinimalDaysInFirstWeek() 2959 */ 2960 public void setFirstDayOfWeek(int value) 2961 { 2962 if (firstDayOfWeek == value) { 2963 return; 2964 } 2965 firstDayOfWeek = value; 2966 invalidateWeekFields(); 2967 } 2968 2969 /** 2970 * Gets what the first day of the week is; e.g., <code>SUNDAY</code> in the U.S., 2971 * <code>MONDAY</code> in France. 2972 * 2973 * @return the first day of the week. 2974 * @see #setFirstDayOfWeek(int) 2975 * @see #getMinimalDaysInFirstWeek() 2976 */ 2977 public int getFirstDayOfWeek() 2978 { 2979 return firstDayOfWeek; 2980 } 2981 2982 /** 2983 * Sets what the minimal days required in the first week of the year are; 2984 * For example, if the first week is defined as one that contains the first 2985 * day of the first month of a year, call this method with value 1. If it 2986 * must be a full week, use value 7. 2987 * 2988 * @param value the given minimal days required in the first week 2989 * of the year. 2990 * @see #getMinimalDaysInFirstWeek() 2991 */ 2992 public void setMinimalDaysInFirstWeek(int value) 2993 { 2994 if (minimalDaysInFirstWeek == value) { 2995 return; 2996 } 2997 minimalDaysInFirstWeek = value; 2998 invalidateWeekFields(); 2999 } 3000 3001 /** 3002 * Gets what the minimal days required in the first week of the year are; 3003 * e.g., if the first week is defined as one that contains the first day 3004 * of the first month of a year, this method returns 1. If 3005 * the minimal days required must be a full week, this method 3006 * returns 7. 3007 * 3008 * @return the minimal days required in the first week of the year. 3009 * @see #setMinimalDaysInFirstWeek(int) 3010 */ 3011 public int getMinimalDaysInFirstWeek() 3012 { 3013 return minimalDaysInFirstWeek; 3014 } 3015 3016 /** 3017 * Returns whether this {@code Calendar} supports week dates. 3018 * 3019 * <p>The default implementation of this method returns {@code false}. 3020 * 3021 * @return {@code true} if this {@code Calendar} supports week dates; 3022 * {@code false} otherwise. 3023 * @see #getWeekYear() 3024 * @see #setWeekDate(int,int,int) 3025 * @see #getWeeksInWeekYear() 3026 * @since 1.7 3027 */ 3028 public boolean isWeekDateSupported() { 3029 return false; 3030 } 3031 3032 /** 3033 * Returns the week year represented by this {@code Calendar}. The 3034 * week year is in sync with the week cycle. The {@linkplain 3035 * #getFirstDayOfWeek() first day of the first week} is the first 3036 * day of the week year. 3037 * 3038 * <p>The default implementation of this method throws an 3039 * {@link UnsupportedOperationException}. 3040 * 3041 * @return the week year of this {@code Calendar} 3042 * @exception UnsupportedOperationException 3043 * if any week year numbering isn't supported 3044 * in this {@code Calendar}. 3045 * @see #isWeekDateSupported() 3046 * @see #getFirstDayOfWeek() 3047 * @see #getMinimalDaysInFirstWeek() 3048 * @since 1.7 3049 */ 3050 public int getWeekYear() { 3051 throw new UnsupportedOperationException(); 3052 } 3053 3054 /** 3055 * Sets the date of this {@code Calendar} with the given date 3056 * specifiers - week year, week of year, and day of week. 3057 * 3058 * <p>Unlike the {@code set} method, all of the calendar fields 3059 * and {@code time} values are calculated upon return. 3060 * 3061 * <p>If {@code weekOfYear} is out of the valid week-of-year range 3062 * in {@code weekYear}, the {@code weekYear} and {@code 3063 * weekOfYear} values are adjusted in lenient mode, or an {@code 3064 * IllegalArgumentException} is thrown in non-lenient mode. 3065 * 3066 * <p>The default implementation of this method throws an 3067 * {@code UnsupportedOperationException}. 3068 * 3069 * @param weekYear the week year 3070 * @param weekOfYear the week number based on {@code weekYear} 3071 * @param dayOfWeek the day of week value: one of the constants 3072 * for the {@link #DAY_OF_WEEK} field: {@link 3073 * #SUNDAY}, ..., {@link #SATURDAY}. 3074 * @exception IllegalArgumentException 3075 * if any of the given date specifiers is invalid 3076 * or any of the calendar fields are inconsistent 3077 * with the given date specifiers in non-lenient mode 3078 * @exception UnsupportedOperationException 3079 * if any week year numbering isn't supported in this 3080 * {@code Calendar}. 3081 * @see #isWeekDateSupported() 3082 * @see #getFirstDayOfWeek() 3083 * @see #getMinimalDaysInFirstWeek() 3084 * @since 1.7 3085 */ 3086 public void setWeekDate(int weekYear, int weekOfYear, int dayOfWeek) { 3087 throw new UnsupportedOperationException(); 3088 } 3089 3090 /** 3091 * Returns the number of weeks in the week year represented by this 3092 * {@code Calendar}. 3093 * 3094 * <p>The default implementation of this method throws an 3095 * {@code UnsupportedOperationException}. 3096 * 3097 * @return the number of weeks in the week year. 3098 * @exception UnsupportedOperationException 3099 * if any week year numbering isn't supported in this 3100 * {@code Calendar}. 3101 * @see #WEEK_OF_YEAR 3102 * @see #isWeekDateSupported() 3103 * @see #getWeekYear() 3104 * @see #getActualMaximum(int) 3105 * @since 1.7 3106 */ 3107 public int getWeeksInWeekYear() { 3108 throw new UnsupportedOperationException(); 3109 } 3110 3111 /** 3112 * Returns the minimum value for the given calendar field of this 3113 * <code>Calendar</code> instance. The minimum value is defined as 3114 * the smallest value returned by the {@link #get(int) get} method 3115 * for any possible time value. The minimum value depends on 3116 * calendar system specific parameters of the instance. 3117 * 3118 * @param field the calendar field. 3119 * @return the minimum value for the given calendar field. 3120 * @see #getMaximum(int) 3121 * @see #getGreatestMinimum(int) 3122 * @see #getLeastMaximum(int) 3123 * @see #getActualMinimum(int) 3124 * @see #getActualMaximum(int) 3125 */ 3126 public abstract int getMinimum(int field); 3127 3128 /** 3129 * Returns the maximum value for the given calendar field of this 3130 * <code>Calendar</code> instance. The maximum value is defined as 3131 * the largest value returned by the {@link #get(int) get} method 3132 * for any possible time value. The maximum value depends on 3133 * calendar system specific parameters of the instance. 3134 * 3135 * @param field the calendar field. 3136 * @return the maximum value for the given calendar field. 3137 * @see #getMinimum(int) 3138 * @see #getGreatestMinimum(int) 3139 * @see #getLeastMaximum(int) 3140 * @see #getActualMinimum(int) 3141 * @see #getActualMaximum(int) 3142 */ 3143 public abstract int getMaximum(int field); 3144 3145 /** 3146 * Returns the highest minimum value for the given calendar field 3147 * of this <code>Calendar</code> instance. The highest minimum 3148 * value is defined as the largest value returned by {@link 3149 * #getActualMinimum(int)} for any possible time value. The 3150 * greatest minimum value depends on calendar system specific 3151 * parameters of the instance. 3152 * 3153 * @param field the calendar field. 3154 * @return the highest minimum value for the given calendar field. 3155 * @see #getMinimum(int) 3156 * @see #getMaximum(int) 3157 * @see #getLeastMaximum(int) 3158 * @see #getActualMinimum(int) 3159 * @see #getActualMaximum(int) 3160 */ 3161 public abstract int getGreatestMinimum(int field); 3162 3163 /** 3164 * Returns the lowest maximum value for the given calendar field 3165 * of this <code>Calendar</code> instance. The lowest maximum 3166 * value is defined as the smallest value returned by {@link 3167 * #getActualMaximum(int)} for any possible time value. The least 3168 * maximum value depends on calendar system specific parameters of 3169 * the instance. For example, a <code>Calendar</code> for the 3170 * Gregorian calendar system returns 28 for the 3171 * <code>DAY_OF_MONTH</code> field, because the 28th is the last 3172 * day of the shortest month of this calendar, February in a 3173 * common year. 3174 * 3175 * @param field the calendar field. 3176 * @return the lowest maximum value for the given calendar field. 3177 * @see #getMinimum(int) 3178 * @see #getMaximum(int) 3179 * @see #getGreatestMinimum(int) 3180 * @see #getActualMinimum(int) 3181 * @see #getActualMaximum(int) 3182 */ 3183 public abstract int getLeastMaximum(int field); 3184 3185 /** 3186 * Returns the minimum value that the specified calendar field 3187 * could have, given the time value of this <code>Calendar</code>. 3188 * 3189 * <p>The default implementation of this method uses an iterative 3190 * algorithm to determine the actual minimum value for the 3191 * calendar field. Subclasses should, if possible, override this 3192 * with a more efficient implementation - in many cases, they can 3193 * simply return <code>getMinimum()</code>. 3194 * 3195 * @param field the calendar field 3196 * @return the minimum of the given calendar field for the time 3197 * value of this <code>Calendar</code> 3198 * @see #getMinimum(int) 3199 * @see #getMaximum(int) 3200 * @see #getGreatestMinimum(int) 3201 * @see #getLeastMaximum(int) 3202 * @see #getActualMaximum(int) 3203 * @since 1.2 3204 */ 3205 public int getActualMinimum(int field) { 3206 int fieldValue = getGreatestMinimum(field); 3207 int endValue = getMinimum(field); 3208 3209 // if we know that the minimum value is always the same, just return it 3210 if (fieldValue == endValue) { 3211 return fieldValue; 3212 } 3213 3214 // clone the calendar so we don't mess with the real one, and set it to 3215 // accept anything for the field values 3216 Calendar work = (Calendar)this.clone(); 3217 work.setLenient(true); 3218 3219 // now try each value from getLeastMaximum() to getMaximum() one by one until 3220 // we get a value that normalizes to another value. The last value that 3221 // normalizes to itself is the actual minimum for the current date 3222 int result = fieldValue; 3223 3224 do { 3225 work.set(field, fieldValue); 3226 if (work.get(field) != fieldValue) { 3227 break; 3228 } else { 3229 result = fieldValue; 3230 fieldValue--; 3231 } 3232 } while (fieldValue >= endValue); 3233 3234 return result; 3235 } 3236 3237 /** 3238 * Returns the maximum value that the specified calendar field 3239 * could have, given the time value of this 3240 * <code>Calendar</code>. For example, the actual maximum value of 3241 * the <code>MONTH</code> field is 12 in some years, and 13 in 3242 * other years in the Hebrew calendar system. 3243 * 3244 * <p>The default implementation of this method uses an iterative 3245 * algorithm to determine the actual maximum value for the 3246 * calendar field. Subclasses should, if possible, override this 3247 * with a more efficient implementation. 3248 * 3249 * @param field the calendar field 3250 * @return the maximum of the given calendar field for the time 3251 * value of this <code>Calendar</code> 3252 * @see #getMinimum(int) 3253 * @see #getMaximum(int) 3254 * @see #getGreatestMinimum(int) 3255 * @see #getLeastMaximum(int) 3256 * @see #getActualMinimum(int) 3257 * @since 1.2 3258 */ 3259 public int getActualMaximum(int field) { 3260 int fieldValue = getLeastMaximum(field); 3261 int endValue = getMaximum(field); 3262 3263 // if we know that the maximum value is always the same, just return it. 3264 if (fieldValue == endValue) { 3265 return fieldValue; 3266 } 3267 3268 // clone the calendar so we don't mess with the real one, and set it to 3269 // accept anything for the field values. 3270 Calendar work = (Calendar)this.clone(); 3271 work.setLenient(true); 3272 3273 // if we're counting weeks, set the day of the week to Sunday. We know the 3274 // last week of a month or year will contain the first day of the week. 3275 if (field == WEEK_OF_YEAR || field == WEEK_OF_MONTH) { 3276 work.set(DAY_OF_WEEK, firstDayOfWeek); 3277 } 3278 3279 // now try each value from getLeastMaximum() to getMaximum() one by one until 3280 // we get a value that normalizes to another value. The last value that 3281 // normalizes to itself is the actual maximum for the current date 3282 int result = fieldValue; 3283 3284 do { 3285 work.set(field, fieldValue); 3286 if (work.get(field) != fieldValue) { 3287 break; 3288 } else { 3289 result = fieldValue; 3290 fieldValue++; 3291 } 3292 } while (fieldValue <= endValue); 3293 3294 return result; 3295 } 3296 3297 /** 3298 * Creates and returns a copy of this object. 3299 * 3300 * @return a copy of this object. 3301 */ 3302 @Override 3303 public Object clone() 3304 { 3305 try { 3306 Calendar other = (Calendar) super.clone(); 3307 3308 other.fields = new int[FIELD_COUNT]; 3309 other.isSet = new boolean[FIELD_COUNT]; 3310 other.stamp = new int[FIELD_COUNT]; 3311 for (int i = 0; i < FIELD_COUNT; i++) { 3312 other.fields[i] = fields[i]; 3313 other.stamp[i] = stamp[i]; 3314 other.isSet[i] = isSet[i]; 3315 } 3316 other.zone = (TimeZone) zone.clone(); 3317 return other; 3318 } 3319 catch (CloneNotSupportedException e) { 3320 // this shouldn't happen, since we are Cloneable 3321 throw new InternalError(e); 3322 } 3323 } 3324 3325 private static final String[] FIELD_NAME = { 3326 "ERA", "YEAR", "MONTH", "WEEK_OF_YEAR", "WEEK_OF_MONTH", "DAY_OF_MONTH", 3327 "DAY_OF_YEAR", "DAY_OF_WEEK", "DAY_OF_WEEK_IN_MONTH", "AM_PM", "HOUR", 3328 "HOUR_OF_DAY", "MINUTE", "SECOND", "MILLISECOND", "ZONE_OFFSET", 3329 "DST_OFFSET" 3330 }; 3331 3332 /** 3333 * Returns the name of the specified calendar field. 3334 * 3335 * @param field the calendar field 3336 * @return the calendar field name 3337 * @exception IndexOutOfBoundsException if <code>field</code> is negative, 3338 * equal to or greater than {@code FIELD_COUNT}. 3339 */ 3340 static String getFieldName(int field) { 3341 return FIELD_NAME[field]; 3342 } 3343 3344 /** 3345 * Return a string representation of this calendar. This method 3346 * is intended to be used only for debugging purposes, and the 3347 * format of the returned string may vary between implementations. 3348 * The returned string may be empty but may not be <code>null</code>. 3349 * 3350 * @return a string representation of this calendar. 3351 */ 3352 @Override 3353 public String toString() { 3354 // NOTE: BuddhistCalendar.toString() interprets the string 3355 // produced by this method so that the Gregorian year number 3356 // is substituted by its B.E. year value. It relies on 3357 // "...,YEAR=<year>,..." or "...,YEAR=?,...". 3358 StringBuilder buffer = new StringBuilder(800); 3359 buffer.append(getClass().getName()).append('['); 3360 appendValue(buffer, "time", isTimeSet, time); 3361 buffer.append(",areFieldsSet=").append(areFieldsSet); 3362 buffer.append(",areAllFieldsSet=").append(areAllFieldsSet); 3363 buffer.append(",lenient=").append(lenient); 3364 buffer.append(",zone=").append(zone); 3365 appendValue(buffer, ",firstDayOfWeek", true, (long) firstDayOfWeek); 3366 appendValue(buffer, ",minimalDaysInFirstWeek", true, (long) minimalDaysInFirstWeek); 3367 for (int i = 0; i < FIELD_COUNT; ++i) { 3368 buffer.append(','); 3369 appendValue(buffer, FIELD_NAME[i], isSet(i), (long) fields[i]); 3370 } 3371 buffer.append(']'); 3372 return buffer.toString(); 3373 } 3374 3375 // =======================privates=============================== 3376 3377 private static void appendValue(StringBuilder sb, String item, boolean valid, long value) { 3378 sb.append(item).append('='); 3379 if (valid) { 3380 sb.append(value); 3381 } else { 3382 sb.append('?'); 3383 } 3384 } 3385 3386 /** 3387 * Both firstDayOfWeek and minimalDaysInFirstWeek are locale-dependent. 3388 * They are used to figure out the week count for a specific date for 3389 * a given locale. These must be set when a Calendar is constructed. 3390 * @param desiredLocale the given locale. 3391 */ 3392 private void setWeekCountData(Locale desiredLocale) 3393 { 3394 /* try to get the Locale data from the cache */ 3395 int[] data = cachedLocaleData.get(desiredLocale); 3396 if (data == null) { /* cache miss */ 3397 data = new int[2]; 3398 data[0] = CalendarDataUtility.retrieveFirstDayOfWeek(desiredLocale); 3399 data[1] = CalendarDataUtility.retrieveMinimalDaysInFirstWeek(desiredLocale); 3400 cachedLocaleData.putIfAbsent(desiredLocale, data); 3401 } 3402 firstDayOfWeek = data[0]; 3403 minimalDaysInFirstWeek = data[1]; 3404 } 3405 3406 /** 3407 * Recomputes the time and updates the status fields isTimeSet 3408 * and areFieldsSet. Callers should check isTimeSet and only 3409 * call this method if isTimeSet is false. 3410 */ 3411 private void updateTime() { 3412 computeTime(); 3413 // The areFieldsSet and areAllFieldsSet values are no longer 3414 // controlled here (as of 1.5). 3415 isTimeSet = true; 3416 } 3417 3418 private int compareTo(long t) { 3419 long thisTime = getMillisOf(this); 3420 return (thisTime > t) ? 1 : (thisTime == t) ? 0 : -1; 3421 } 3422 3423 private static long getMillisOf(Calendar calendar) { 3424 if (calendar.isTimeSet) { 3425 return calendar.time; 3426 } 3427 Calendar cal = (Calendar) calendar.clone(); 3428 cal.setLenient(true); 3429 return cal.getTimeInMillis(); 3430 } 3431 3432 /** 3433 * Adjusts the stamp[] values before nextStamp overflow. nextStamp 3434 * is set to the next stamp value upon the return. 3435 */ 3436 private void adjustStamp() { 3437 int max = MINIMUM_USER_STAMP; 3438 int newStamp = MINIMUM_USER_STAMP; 3439 3440 for (;;) { 3441 int min = Integer.MAX_VALUE; 3442 for (int v : stamp) { 3443 if (v >= newStamp && min > v) { 3444 min = v; 3445 } 3446 if (max < v) { 3447 max = v; 3448 } 3449 } 3450 if (max != min && min == Integer.MAX_VALUE) { 3451 break; 3452 } 3453 for (int i = 0; i < stamp.length; i++) { 3454 if (stamp[i] == min) { 3455 stamp[i] = newStamp; 3456 } 3457 } 3458 newStamp++; 3459 if (min == max) { 3460 break; 3461 } 3462 } 3463 nextStamp = newStamp; 3464 } 3465 3466 /** 3467 * Sets the WEEK_OF_MONTH and WEEK_OF_YEAR fields to new values with the 3468 * new parameter value if they have been calculated internally. 3469 */ 3470 private void invalidateWeekFields() 3471 { 3472 if (stamp[WEEK_OF_MONTH] != COMPUTED && 3473 stamp[WEEK_OF_YEAR] != COMPUTED) { 3474 return; 3475 } 3476 3477 // We have to check the new values of these fields after changing 3478 // firstDayOfWeek and/or minimalDaysInFirstWeek. If the field values 3479 // have been changed, then set the new values. (4822110) 3480 Calendar cal = (Calendar) clone(); 3481 cal.setLenient(true); 3482 cal.clear(WEEK_OF_MONTH); 3483 cal.clear(WEEK_OF_YEAR); 3484 3485 if (stamp[WEEK_OF_MONTH] == COMPUTED) { 3486 int weekOfMonth = cal.get(WEEK_OF_MONTH); 3487 if (fields[WEEK_OF_MONTH] != weekOfMonth) { 3488 fields[WEEK_OF_MONTH] = weekOfMonth; 3489 } 3490 } 3491 3492 if (stamp[WEEK_OF_YEAR] == COMPUTED) { 3493 int weekOfYear = cal.get(WEEK_OF_YEAR); 3494 if (fields[WEEK_OF_YEAR] != weekOfYear) { 3495 fields[WEEK_OF_YEAR] = weekOfYear; 3496 } 3497 } 3498 } 3499 3500 /** 3501 * Save the state of this object to a stream (i.e., serialize it). 3502 * 3503 * Ideally, <code>Calendar</code> would only write out its state data and 3504 * the current time, and not write any field data out, such as 3505 * <code>fields[]</code>, <code>isTimeSet</code>, <code>areFieldsSet</code>, 3506 * and <code>isSet[]</code>. <code>nextStamp</code> also should not be part 3507 * of the persistent state. Unfortunately, this didn't happen before JDK 1.1 3508 * shipped. To be compatible with JDK 1.1, we will always have to write out 3509 * the field values and state flags. However, <code>nextStamp</code> can be 3510 * removed from the serialization stream; this will probably happen in the 3511 * near future. 3512 */ 3513 private synchronized void writeObject(ObjectOutputStream stream) 3514 throws IOException 3515 { 3516 // Try to compute the time correctly, for the future (stream 3517 // version 2) in which we don't write out fields[] or isSet[]. 3518 if (!isTimeSet) { 3519 try { 3520 updateTime(); 3521 } 3522 catch (IllegalArgumentException e) {} 3523 } 3524 3525 // If this Calendar has a ZoneInfo, save it and set a 3526 // SimpleTimeZone equivalent (as a single DST schedule) for 3527 // backward compatibility. 3528 TimeZone savedZone = null; 3529 if (zone instanceof ZoneInfo) { 3530 SimpleTimeZone stz = ((ZoneInfo)zone).getLastRuleInstance(); 3531 if (stz == null) { 3532 stz = new SimpleTimeZone(zone.getRawOffset(), zone.getID()); 3533 } 3534 savedZone = zone; 3535 zone = stz; 3536 } 3537 3538 // Write out the 1.1 FCS object. 3539 stream.defaultWriteObject(); 3540 3541 // Write out the ZoneInfo object 3542 // 4802409: we write out even if it is null, a temporary workaround 3543 // the real fix for bug 4844924 in corba-iiop 3544 stream.writeObject(savedZone); 3545 if (savedZone != null) { 3546 zone = savedZone; 3547 } 3548 } 3549 3550 private static class CalendarAccessControlContext { 3551 private static final AccessControlContext INSTANCE; 3552 static { 3553 RuntimePermission perm = new RuntimePermission("accessClassInPackage.sun.util.calendar"); 3554 PermissionCollection perms = perm.newPermissionCollection(); 3555 perms.add(perm); 3556 INSTANCE = new AccessControlContext(new ProtectionDomain[] { 3557 new ProtectionDomain(null, perms) 3558 }); 3559 } 3560 private CalendarAccessControlContext() { 3561 } 3562 } 3563 3564 /** 3565 * Reconstitutes this object from a stream (i.e., deserialize it). 3566 */ 3567 private void readObject(ObjectInputStream stream) 3568 throws IOException, ClassNotFoundException 3569 { 3570 final ObjectInputStream input = stream; 3571 input.defaultReadObject(); 3572 3573 stamp = new int[FIELD_COUNT]; 3574 3575 // Starting with version 2 (not implemented yet), we expect that 3576 // fields[], isSet[], isTimeSet, and areFieldsSet may not be 3577 // streamed out anymore. We expect 'time' to be correct. 3578 if (serialVersionOnStream >= 2) 3579 { 3580 isTimeSet = true; 3581 if (fields == null) { 3582 fields = new int[FIELD_COUNT]; 3583 } 3584 if (isSet == null) { 3585 isSet = new boolean[FIELD_COUNT]; 3586 } 3587 } 3588 else if (serialVersionOnStream >= 0) 3589 { 3590 for (int i=0; i<FIELD_COUNT; ++i) { 3591 stamp[i] = isSet[i] ? COMPUTED : UNSET; 3592 } 3593 } 3594 3595 serialVersionOnStream = currentSerialVersion; 3596 3597 // If there's a ZoneInfo object, use it for zone. 3598 ZoneInfo zi = null; 3599 try { 3600 zi = AccessController.doPrivileged( 3601 new PrivilegedExceptionAction<>() { 3602 @Override 3603 public ZoneInfo run() throws Exception { 3604 return (ZoneInfo) input.readObject(); 3605 } 3606 }, 3607 CalendarAccessControlContext.INSTANCE); 3608 } catch (PrivilegedActionException pae) { 3609 Exception e = pae.getException(); 3610 if (!(e instanceof OptionalDataException)) { 3611 if (e instanceof RuntimeException) { 3612 throw (RuntimeException) e; 3613 } else if (e instanceof IOException) { 3614 throw (IOException) e; 3615 } else if (e instanceof ClassNotFoundException) { 3616 throw (ClassNotFoundException) e; 3617 } 3618 throw new RuntimeException(e); 3619 } 3620 } 3621 if (zi != null) { 3622 zone = zi; 3623 } 3624 3625 // If the deserialized object has a SimpleTimeZone, try to 3626 // replace it with a ZoneInfo equivalent (as of 1.4) in order 3627 // to be compatible with the SimpleTimeZone-based 3628 // implementation as much as possible. 3629 if (zone instanceof SimpleTimeZone) { 3630 String id = zone.getID(); 3631 TimeZone tz = TimeZone.getTimeZone(id); 3632 if (tz != null && tz.hasSameRules(zone) && tz.getID().equals(id)) { 3633 zone = tz; 3634 } 3635 } 3636 } 3637 3638 /** 3639 * Converts this object to an {@link Instant}. 3640 * <p> 3641 * The conversion creates an {@code Instant} that represents the 3642 * same point on the time-line as this {@code Calendar}. 3643 * 3644 * @return the instant representing the same point on the time-line 3645 * @since 1.8 3646 */ 3647 public final Instant toInstant() { 3648 return Instant.ofEpochMilli(getTimeInMillis()); 3649 } 3650 }