1 /* Copyright 2002-2019 CS Systèmes d'Information
2 * Licensed to CS Systèmes d'Information (CS) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * CS licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.orekit.time;
18
19 import java.io.Serializable;
20 import java.text.DecimalFormat;
21 import java.util.regex.Matcher;
22 import java.util.regex.Pattern;
23
24 import org.orekit.errors.OrekitIllegalArgumentException;
25 import org.orekit.errors.OrekitMessages;
26
27 /** Class representing a date broken up as year, month and day components.
28 * <p>This class uses the astronomical convention for calendars,
29 * which is also the convention used by <code>java.util.Date</code>:
30 * a year zero is present between years -1 and +1, and 10 days are
31 * missing in 1582. The calendar used around these special dates are:</p>
32 * <ul>
33 * <li>up to 0000-12-31 : proleptic julian calendar</li>
34 * <li>from 0001-01-01 to 1582-10-04: julian calendar</li>
35 * <li>from 1582-10-15: gregorian calendar</li>
36 * </ul>
37 * <p>Instances of this class are guaranteed to be immutable.</p>
38 * @see TimeComponents
39 * @see DateTimeComponents
40 * @author Luc Maisonobe
41 */
42 public class DateComponents implements Serializable, Comparable<DateComponents> {
43
44 /** Reference epoch for julian dates: -4712-01-01.
45 * <p>Both <code>java.util.Date</code> and {@link DateComponents} classes
46 * follow the astronomical conventions and consider a year 0 between
47 * years -1 and +1, hence this reference date lies in year -4712 and not
48 * in year -4713 as can be seen in other documents or programs that obey
49 * a different convention (for example the <code>convcal</code> utility).</p>
50 */
51 public static final DateComponents JULIAN_EPOCH;
52
53 /** Reference epoch for modified julian dates: 1858-11-17. */
54 public static final DateComponents MODIFIED_JULIAN_EPOCH;
55
56 /** Reference epoch for 1950 dates: 1950-01-01. */
57 public static final DateComponents FIFTIES_EPOCH;
58
59 /** Reference epoch for CCSDS Time Code Format (CCSDS 301.0-B-4): 1958-01-01. */
60 public static final DateComponents CCSDS_EPOCH;
61
62 /** Reference epoch for Galileo System Time: 1999-08-22. */
63 public static final DateComponents GALILEO_EPOCH;
64
65 /** Reference epoch for GPS weeks: 1980-01-06. */
66 public static final DateComponents GPS_EPOCH;
67
68 /** Reference epoch for QZSS weeks: 1980-01-06. */
69 public static final DateComponents QZSS_EPOCH;
70
71 /** Reference epoch for BeiDou weeks: 2006-01-01. */
72 public static final DateComponents BEIDOU_EPOCH;
73
74 /** Reference epoch for GLONASS four-year interval number: 1996-01-01. */
75 public static final DateComponents GLONASS_EPOCH;
76
77 /** J2000.0 Reference epoch: 2000-01-01. */
78 public static final DateComponents J2000_EPOCH;
79
80 /** Java Reference epoch: 1970-01-01. */
81 public static final DateComponents JAVA_EPOCH;
82
83 /** Maximum supported date.
84 * <p>
85 * This is date 5881610-07-11 which corresponds to {@code Integer.MAX_VALUE}
86 * days after {@link #J2000_EPOCH}.
87 * </p>
88 * @since 9.0
89 */
90 public static final DateComponents MAX_EPOCH;
91
92 /** Maximum supported date.
93 * <p>
94 * This is date -5877490-03-03, which corresponds to {@code Integer.MIN_VALUE}
95 * days before {@link #J2000_EPOCH}.
96 * </p>
97 * @since 9.0
98 */
99 public static final DateComponents MIN_EPOCH;
100
101 /** Serializable UID. */
102 private static final long serialVersionUID = -2462694707837970938L;
103
104 /** Factory for proleptic julian calendar (up to 0000-12-31). */
105 private static final YearFactory PROLEPTIC_JULIAN_FACTORY = new ProlepticJulianFactory();
106
107 /** Factory for julian calendar (from 0001-01-01 to 1582-10-04). */
108 private static final YearFactory JULIAN_FACTORY = new JulianFactory();
109
110 /** Factory for gregorian calendar (from 1582-10-15). */
111 private static final YearFactory GREGORIAN_FACTORY = new GregorianFactory();
112
113 /** Factory for leap years. */
114 private static final MonthDayFactory LEAP_YEAR_FACTORY = new LeapYearFactory();
115
116 /** Factory for non-leap years. */
117 private static final MonthDayFactory COMMON_YEAR_FACTORY = new CommonYearFactory();
118
119 /** Format for years. */
120 private static final DecimalFormat FOUR_DIGITS = new DecimalFormat("0000");
121
122 /** Format for months and days. */
123 private static final DecimalFormat TWO_DIGITS = new DecimalFormat("00");
124
125 /** Offset between J2000 epoch and modified julian day epoch. */
126 private static final int MJD_TO_J2000 = 51544;
127
128 /** Basic and extended format calendar date. */
129 private static Pattern CALENDAR_FORMAT = Pattern.compile("^(-?\\d\\d\\d\\d)-?(\\d\\d)-?(\\d\\d)$");
130
131 /** Basic and extended format ordinal date. */
132 private static Pattern ORDINAL_FORMAT = Pattern.compile("^(-?\\d\\d\\d\\d)-?(\\d\\d\\d)$");
133
134 /** Basic and extended format week date. */
135 private static Pattern WEEK_FORMAT = Pattern.compile("^(-?\\d\\d\\d\\d)-?W(\\d\\d)-?(\\d)$");
136
137 static {
138 // this static statement makes sure the reference epoch are initialized
139 // once AFTER the various factories have been set up
140 JULIAN_EPOCH = new DateComponents(-4712, 1, 1);
141 MODIFIED_JULIAN_EPOCH = new DateComponents(1858, 11, 17);
142 FIFTIES_EPOCH = new DateComponents(1950, 1, 1);
143 CCSDS_EPOCH = new DateComponents(1958, 1, 1);
144 GALILEO_EPOCH = new DateComponents(1999, 8, 22);
145 GPS_EPOCH = new DateComponents(1980, 1, 6);
146 QZSS_EPOCH = new DateComponents(1980, 1, 6);
147 BEIDOU_EPOCH = new DateComponents(2006, 1, 1);
148 GLONASS_EPOCH = new DateComponents(1996, 1, 1);
149 J2000_EPOCH = new DateComponents(2000, 1, 1);
150 JAVA_EPOCH = new DateComponents(1970, 1, 1);
151 MAX_EPOCH = new DateComponents(Integer.MAX_VALUE);
152 MIN_EPOCH = new DateComponents(Integer.MIN_VALUE);
153 }
154
155 /** Year number. */
156 private final int year;
157
158 /** Month number. */
159 private final int month;
160
161 /** Day number. */
162 private final int day;
163
164 /** Build a date from its components.
165 * @param year year number (may be 0 or negative for BC years)
166 * @param month month number from 1 to 12
167 * @param day day number from 1 to 31
168 * @exception IllegalArgumentException if inconsistent arguments
169 * are given (parameters out of range, february 29 for non-leap years,
170 * dates during the gregorian leap in 1582 ...)
171 */
172 public DateComponents(final int year, final int month, final int day)
173 throws IllegalArgumentException {
174
175 // very rough range check
176 // (just to avoid ArrayOutOfboundException in MonthDayFactory later)
177 if ((month < 1) || (month > 12)) {
178 throw new OrekitIllegalArgumentException(OrekitMessages.NON_EXISTENT_MONTH, month);
179 }
180
181 // start by trusting the parameters
182 this.year = year;
183 this.month = month;
184 this.day = day;
185
186 // build a check date from the J2000 day
187 final DateComponentsteComponents">DateComponents check = new DateComponents(getJ2000Day());
188
189 // check the parameters for mismatch
190 // (i.e. invalid date components, like 29 february on non-leap years)
191 if ((year != check.year) || (month != check.month) || (day != check.day)) {
192 throw new OrekitIllegalArgumentException(OrekitMessages.NON_EXISTENT_YEAR_MONTH_DAY,
193 year, month, day);
194 }
195
196 }
197
198 /** Build a date from its components.
199 * @param year year number (may be 0 or negative for BC years)
200 * @param month month enumerate
201 * @param day day number from 1 to 31
202 * @exception IllegalArgumentException if inconsistent arguments
203 * are given (parameters out of range, february 29 for non-leap years,
204 * dates during the gregorian leap in 1582 ...)
205 */
206 public DateComponents(final int year, final Month month, final int day)
207 throws IllegalArgumentException {
208 this(year, month.getNumber(), day);
209 }
210
211 /** Build a date from a year and day number.
212 * @param year year number (may be 0 or negative for BC years)
213 * @param dayNumber day number in the year from 1 to 366
214 * @exception IllegalArgumentException if dayNumber is out of range
215 * with respect to year
216 */
217 public DateComponents(final int year, final int dayNumber)
218 throws IllegalArgumentException {
219 this(J2000_EPOCH, new DateComponents(year - 1, 12, 31).getJ2000Day() + dayNumber);
220 if (dayNumber != getDayOfYear()) {
221 throw new OrekitIllegalArgumentException(OrekitMessages.NON_EXISTENT_DAY_NUMBER_IN_YEAR,
222 dayNumber, year);
223 }
224 }
225
226 /** Build a date from its offset with respect to a {@link #J2000_EPOCH}.
227 * @param offset offset with respect to a {@link #J2000_EPOCH}
228 * @see #getJ2000Day()
229 */
230 public DateComponents(final int offset) {
231
232 // we follow the astronomical convention for calendars:
233 // we consider a year zero and 10 days are missing in 1582
234 // from 1582-10-15: gregorian calendar
235 // from 0001-01-01 to 1582-10-04: julian calendar
236 // up to 0000-12-31 : proleptic julian calendar
237 YearFactory yFactory = GREGORIAN_FACTORY;
238 if (offset < -152384) {
239 if (offset > -730122) {
240 yFactory = JULIAN_FACTORY;
241 } else {
242 yFactory = PROLEPTIC_JULIAN_FACTORY;
243 }
244 }
245 year = yFactory.getYear(offset);
246 final int dayInYear = offset - yFactory.getLastJ2000DayOfYear(year - 1);
247
248 // handle month/day according to the year being a common or leap year
249 final MonthDayFactory mdFactory =
250 yFactory.isLeap(year) ? LEAP_YEAR_FACTORY : COMMON_YEAR_FACTORY;
251 month = mdFactory.getMonth(dayInYear);
252 day = mdFactory.getDay(dayInYear, month);
253
254 }
255
256 /** Build a date from its offset with respect to a reference epoch.
257 * <p>This constructor is mainly useful to build a date from a modified
258 * julian day (using {@link #MODIFIED_JULIAN_EPOCH}) or a GPS week number
259 * (using {@link #GPS_EPOCH}).</p>
260 * @param epoch reference epoch
261 * @param offset offset with respect to a reference epoch
262 * @see #DateComponents(int)
263 * @see #getMJD()
264 */
265 public DateComponentstml#DateComponents">DateComponents(final DateComponents epoch, final int offset) {
266 this(epoch.getJ2000Day() + offset);
267 }
268
269 /** Build a date from week components.
270 * <p>The calendar week number is a number between 1 and 52 or 53 depending
271 * on the year. Week 1 is defined by ISO as the one that includes the first
272 * Thursday of a year. Week 1 may therefore start the previous year and week
273 * 52 or 53 may end in the next year. As an example calendar date 1995-01-01
274 * corresponds to week date 1994-W52-7 (i.e. Sunday in the last week of 1994
275 * is in fact the first day of year 1995). This date would beAnother example is calendar date
276 * 1996-12-31 which corresponds to week date 1997-W01-2 (i.e. Tuesday in the
277 * first week of 1997 is in fact the last day of year 1996).</p>
278 * @param wYear year associated to week numbering
279 * @param week week number in year, from 1 to 52 or 53
280 * @param dayOfWeek day of week, from 1 (Monday) to 7 (Sunday)
281 * @return a builded date
282 * @exception IllegalArgumentException if inconsistent arguments
283 * are given (parameters out of range, week 53 on a 52 weeks year ...)
284 */
285 public static DateComponents createFromWeekComponents(final int wYear, final int week, final int dayOfWeek)
286 throws IllegalArgumentException {
287
288 final DateComponentsts">DateComponents firstWeekMonday = new DateComponents(getFirstWeekMonday(wYear));
289 final DateComponentsl#DateComponents">DateComponents d = new DateComponents(firstWeekMonday, 7 * week + dayOfWeek - 8);
290
291 // check the parameters for invalid date components
292 if ((week != d.getCalendarWeek()) || (dayOfWeek != d.getDayOfWeek())) {
293 throw new OrekitIllegalArgumentException(OrekitMessages.NON_EXISTENT_WEEK_DATE,
294 wYear, week, dayOfWeek);
295 }
296
297 return d;
298
299 }
300
301 /** Parse a string in ISO-8601 format to build a date.
302 * <p>The supported formats are:
303 * <ul>
304 * <li>basic format calendar date: YYYYMMDD</li>
305 * <li>extended format calendar date: YYYY-MM-DD</li>
306 * <li>basic format ordinal date: YYYYDDD</li>
307 * <li>extended format ordinal date: YYYY-DDD</li>
308 * <li>basic format week date: YYYYWwwD</li>
309 * <li>extended format week date: YYYY-Www-D</li>
310 * </ul>
311 *
312 * <p> As shown by the list above, only the complete representations defined in section 4.1
313 * of ISO-8601 standard are supported, neither expended representations nor representations
314 * with reduced accuracy are supported.
315 *
316 * <p>
317 * Parsing a single integer as a julian day is <em>not</em> supported as it may be ambiguous
318 * with either the basic format calendar date or the basic format ordinal date depending
319 * on the number of digits.
320 * </p>
321 * @param string string to parse
322 * @return a parsed date
323 * @exception IllegalArgumentException if string cannot be parsed
324 */
325 public static DateComponents parseDate(final String string) {
326
327 // is the date a calendar date ?
328 final Matcher calendarMatcher = CALENDAR_FORMAT.matcher(string);
329 if (calendarMatcher.matches()) {
330 return new DateComponents(Integer.parseInt(calendarMatcher.group(1)),
331 Integer.parseInt(calendarMatcher.group(2)),
332 Integer.parseInt(calendarMatcher.group(3)));
333 }
334
335 // is the date an ordinal date ?
336 final Matcher ordinalMatcher = ORDINAL_FORMAT.matcher(string);
337 if (ordinalMatcher.matches()) {
338 return new DateComponents(Integer.parseInt(ordinalMatcher.group(1)),
339 Integer.parseInt(ordinalMatcher.group(2)));
340 }
341
342 // is the date a week date ?
343 final Matcher weekMatcher = WEEK_FORMAT.matcher(string);
344 if (weekMatcher.matches()) {
345 return createFromWeekComponents(Integer.parseInt(weekMatcher.group(1)),
346 Integer.parseInt(weekMatcher.group(2)),
347 Integer.parseInt(weekMatcher.group(3)));
348 }
349
350 throw new OrekitIllegalArgumentException(OrekitMessages.NON_EXISTENT_DATE, string);
351
352 }
353
354 /** Get the year number.
355 * @return year number (may be 0 or negative for BC years)
356 */
357 public int getYear() {
358 return year;
359 }
360
361 /** Get the month.
362 * @return month number from 1 to 12
363 */
364 public int getMonth() {
365 return month;
366 }
367
368 /** Get the month as an enumerate.
369 * @return month as an enumerate
370 */
371 public Month getMonthEnum() {
372 return Month.getMonth(month);
373 }
374
375 /** Get the day.
376 * @return day number from 1 to 31
377 */
378 public int getDay() {
379 return day;
380 }
381
382 /** Get the day number with respect to J2000 epoch.
383 * @return day number with respect to J2000 epoch
384 */
385 public int getJ2000Day() {
386 YearFactory yFactory = GREGORIAN_FACTORY;
387 if (year < 1583) {
388 if (year < 1) {
389 yFactory = PROLEPTIC_JULIAN_FACTORY;
390 } else if ((year < 1582) || (month < 10) || ((month < 11) && (day < 5))) {
391 yFactory = JULIAN_FACTORY;
392 }
393 }
394 final MonthDayFactory mdFactory =
395 yFactory.isLeap(year) ? LEAP_YEAR_FACTORY : COMMON_YEAR_FACTORY;
396 return yFactory.getLastJ2000DayOfYear(year - 1) +
397 mdFactory.getDayInYear(month, day);
398 }
399
400 /** Get the modified julian day.
401 * @return modified julian day
402 */
403 public int getMJD() {
404 return MJD_TO_J2000 + getJ2000Day();
405 }
406
407 /** Get the calendar week number.
408 * <p>The calendar week number is a number between 1 and 52 or 53 depending
409 * on the year. Week 1 is defined by ISO as the one that includes the first
410 * Thursday of a year. Week 1 may therefore start the previous year and week
411 * 52 or 53 may end in the next year. As an example calendar date 1995-01-01
412 * corresponds to week date 1994-W52-7 (i.e. Sunday in the last week of 1994
413 * is in fact the first day of year 1995). Another example is calendar date
414 * 1996-12-31 which corresponds to week date 1997-W01-2 (i.e. Tuesday in the
415 * first week of 1997 is in fact the last day of year 1996).</p>
416 * @return calendar week number
417 */
418 public int getCalendarWeek() {
419 final int firstWeekMonday = getFirstWeekMonday(year);
420 int daysSincefirstMonday = getJ2000Day() - firstWeekMonday;
421 if (daysSincefirstMonday < 0) {
422 // we are still in a week from previous year
423 daysSincefirstMonday += firstWeekMonday - getFirstWeekMonday(year - 1);
424 } else if (daysSincefirstMonday > 363) {
425 // up to three days at end of year may belong to first week of next year
426 // (by chance, there is no need for a specific check in year 1582 ...)
427 final int weekYearLength = getFirstWeekMonday(year + 1) - firstWeekMonday;
428 if (daysSincefirstMonday >= weekYearLength) {
429 daysSincefirstMonday -= weekYearLength;
430 }
431 }
432 return 1 + daysSincefirstMonday / 7;
433 }
434
435 /** Get the monday of a year first week.
436 * @param year year to consider
437 * @return day of the monday of the first weak of year
438 */
439 private static int getFirstWeekMonday(final int year) {
440 final int yearFirst = new DateComponents(year, 1, 1).getJ2000Day();
441 final int offsetToMonday = 4 - (yearFirst + 2) % 7;
442 return yearFirst + offsetToMonday + ((offsetToMonday > 3) ? -7 : 0);
443 }
444
445 /** Get the day of week.
446 * <p>Day of week is a number between 1 (Monday) and 7 (Sunday).</p>
447 * @return day of week
448 */
449 public int getDayOfWeek() {
450 final int dow = (getJ2000Day() + 6) % 7; // result is between -6 and +6
451 return (dow < 1) ? (dow + 7) : dow;
452 }
453
454 /** Get the day number in year.
455 * <p>Day number in year is between 1 (January 1st) and either 365 or
456 * 366 inclusive depending on year.</p>
457 * @return day number in year
458 */
459 public int getDayOfYear() {
460 return getJ2000Day() - new DateComponents(year - 1, 12, 31).getJ2000Day();
461 }
462
463 /** Get a string representation (ISO-8601) of the date.
464 * @return string representation of the date.
465 */
466 public String toString() {
467 return new StringBuffer().
468 append(FOUR_DIGITS.format(year)).append('-').
469 append(TWO_DIGITS.format(month)).append('-').
470 append(TWO_DIGITS.format(day)).
471 toString();
472 }
473
474 /** {@inheritDoc} */
475 public int compareTo(final DateComponents other) {
476 final int j2000Day = getJ2000Day();
477 final int otherJ2000Day = other.getJ2000Day();
478 if (j2000Day < otherJ2000Day) {
479 return -1;
480 } else if (j2000Day > otherJ2000Day) {
481 return 1;
482 }
483 return 0;
484 }
485
486 /** {@inheritDoc} */
487 public boolean equals(final Object other) {
488 try {
489 final DateComponentsg/orekit/time/DateComponents.html#DateComponents">DateComponents otherDate = (DateComponents) other;
490 return (otherDate != null) && (year == otherDate.year) &&
491 (month == otherDate.month) && (day == otherDate.day);
492 } catch (ClassCastException cce) {
493 return false;
494 }
495 }
496
497 /** {@inheritDoc} */
498 public int hashCode() {
499 return (year << 16) ^ (month << 8) ^ day;
500 }
501
502 /** Interface for dealing with years sequences according to some calendar. */
503 private interface YearFactory {
504
505 /** Get the year number for a given day number with respect to J2000 epoch.
506 * @param j2000Day day number with respect to J2000 epoch
507 * @return year number
508 */
509 int getYear(int j2000Day);
510
511 /** Get the day number with respect to J2000 epoch for new year's Eve.
512 * @param year year number
513 * @return day number with respect to J2000 epoch for new year's Eve
514 */
515 int getLastJ2000DayOfYear(int year);
516
517 /** Check if a year is a leap or common year.
518 * @param year year number
519 * @return true if year is a leap year
520 */
521 boolean isLeap(int year);
522
523 }
524
525 /** Class providing a years sequence compliant with the proleptic Julian calendar. */
526 private static class ProlepticJulianFactory implements YearFactory {
527
528 /** {@inheritDoc} */
529 public int getYear(final int j2000Day) {
530 return (int) -((-4l * j2000Day - 2920488l) / 1461l);
531 }
532
533 /** {@inheritDoc} */
534 public int getLastJ2000DayOfYear(final int year) {
535 return 365 * year + (year + 1) / 4 - 730123;
536 }
537
538 /** {@inheritDoc} */
539 public boolean isLeap(final int year) {
540 return (year % 4) == 0;
541 }
542
543 }
544
545 /** Class providing a years sequence compliant with the Julian calendar. */
546 private static class JulianFactory implements YearFactory {
547
548 /** {@inheritDoc} */
549 public int getYear(final int j2000Day) {
550 return (int) ((4l * j2000Day + 2921948l) / 1461l);
551 }
552
553 /** {@inheritDoc} */
554 public int getLastJ2000DayOfYear(final int year) {
555 return 365 * year + year / 4 - 730122;
556 }
557
558 /** {@inheritDoc} */
559 public boolean isLeap(final int year) {
560 return (year % 4) == 0;
561 }
562
563 }
564
565 /** Class providing a years sequence compliant with the Gregorian calendar. */
566 private static class GregorianFactory implements YearFactory {
567
568 /** {@inheritDoc} */
569 public int getYear(final int j2000Day) {
570
571 // year estimate
572 int year = (int) ((400l * j2000Day + 292194288l) / 146097l);
573
574 // the previous estimate is one unit too high in some rare cases
575 // (240 days in the 400 years gregorian cycle, about 0.16%)
576 if (j2000Day <= getLastJ2000DayOfYear(year - 1)) {
577 --year;
578 }
579
580 // exact year
581 return year;
582
583 }
584
585 /** {@inheritDoc} */
586 public int getLastJ2000DayOfYear(final int year) {
587 return 365 * year + year / 4 - year / 100 + year / 400 - 730120;
588 }
589
590 /** {@inheritDoc} */
591 public boolean isLeap(final int year) {
592 return ((year % 4) == 0) && (((year % 400) == 0) || ((year % 100) != 0));
593 }
594
595 }
596
597 /** Interface for dealing with months sequences according to leap/common years. */
598 private interface MonthDayFactory {
599
600 /** Get the month number for a given day number within year.
601 * @param dayInYear day number within year
602 * @return month number
603 */
604 int getMonth(int dayInYear);
605
606 /** Get the day number for given month and day number within year.
607 * @param dayInYear day number within year
608 * @param month month number
609 * @return day number
610 */
611 int getDay(int dayInYear, int month);
612
613 /** Get the day number within year for given month and day numbers.
614 * @param month month number
615 * @param day day number
616 * @return day number within year
617 */
618 int getDayInYear(int month, int day);
619
620 }
621
622 /** Class providing the months sequence for leap years. */
623 private static class LeapYearFactory implements MonthDayFactory {
624
625 /** Months succession definition. */
626 private static final int[] PREVIOUS_MONTH_END_DAY = {
627 0, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335
628 };
629
630 /** {@inheritDoc} */
631 public int getMonth(final int dayInYear) {
632 return (dayInYear < 32) ? 1 : (10 * dayInYear + 313) / 306;
633 }
634
635 /** {@inheritDoc} */
636 public int getDay(final int dayInYear, final int month) {
637 return dayInYear - PREVIOUS_MONTH_END_DAY[month];
638 }
639
640 /** {@inheritDoc} */
641 public int getDayInYear(final int month, final int day) {
642 return day + PREVIOUS_MONTH_END_DAY[month];
643 }
644
645 }
646
647 /** Class providing the months sequence for common years. */
648 private static class CommonYearFactory implements MonthDayFactory {
649
650 /** Months succession definition. */
651 private static final int[] PREVIOUS_MONTH_END_DAY = {
652 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
653 };
654
655 /** {@inheritDoc} */
656 public int getMonth(final int dayInYear) {
657 return (dayInYear < 32) ? 1 : (10 * dayInYear + 323) / 306;
658 }
659
660 /** {@inheritDoc} */
661 public int getDay(final int dayInYear, final int month) {
662 return dayInYear - PREVIOUS_MONTH_END_DAY[month];
663 }
664
665 /** {@inheritDoc} */
666 public int getDayInYear(final int month, final int day) {
667 return day + PREVIOUS_MONTH_END_DAY[month];
668 }
669
670 }
671
672 }