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date Tue, 18 Mar 2025 17:55:14 -0400
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1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /********************************************************************************
4 * Copyright (C) 2008-2016, International Business Machines Corporation and
5 * others. All Rights Reserved.
6 *******************************************************************************
7 *
8 * File DTITVFMT.H
9 *
10 *******************************************************************************
11 */
12
13 #ifndef __DTITVFMT_H__
14 #define __DTITVFMT_H__
15
16
17 #include "unicode/utypes.h"
18
19 #if U_SHOW_CPLUSPLUS_API
20
21 /**
22 * \file
23 * \brief C++ API: Format and parse date interval in a language-independent manner.
24 */
25
26 #if !UCONFIG_NO_FORMATTING
27
28 #include "unicode/ucal.h"
29 #include "unicode/smpdtfmt.h"
30 #include "unicode/dtintrv.h"
31 #include "unicode/dtitvinf.h"
32 #include "unicode/dtptngen.h"
33 #include "unicode/formattedvalue.h"
34
35 U_NAMESPACE_BEGIN
36
37
38 class FormattedDateIntervalData;
39 class DateIntervalFormat;
40
41 /**
42 * An immutable class containing the result of a date interval formatting operation.
43 *
44 * Instances of this class are immutable and thread-safe.
45 *
46 * When calling nextPosition():
47 * The fields are returned from left to right. The special field category
48 * UFIELD_CATEGORY_DATE_INTERVAL_SPAN is used to indicate which datetime
49 * primitives came from which arguments: 0 means fromCalendar, and 1 means
50 * toCalendar. The span category will always occur before the
51 * corresponding fields in UFIELD_CATEGORY_DATE
52 * in the nextPosition() iterator.
53 *
54 * Not intended for public subclassing.
55 *
56 * @stable ICU 64
57 */
58 class U_I18N_API FormattedDateInterval : public UMemory, public FormattedValue {
59 public:
60 /**
61 * Default constructor; makes an empty FormattedDateInterval.
62 * @stable ICU 64
63 */
64 FormattedDateInterval() : fData(nullptr), fErrorCode(U_INVALID_STATE_ERROR) {}
65
66 /**
67 * Move constructor: Leaves the source FormattedDateInterval in an undefined state.
68 * @stable ICU 64
69 */
70 FormattedDateInterval(FormattedDateInterval&& src) U_NOEXCEPT;
71
72 /**
73 * Destruct an instance of FormattedDateInterval.
74 * @stable ICU 64
75 */
76 virtual ~FormattedDateInterval() U_OVERRIDE;
77
78 /** Copying not supported; use move constructor instead. */
79 FormattedDateInterval(const FormattedDateInterval&) = delete;
80
81 /** Copying not supported; use move assignment instead. */
82 FormattedDateInterval& operator=(const FormattedDateInterval&) = delete;
83
84 /**
85 * Move assignment: Leaves the source FormattedDateInterval in an undefined state.
86 * @stable ICU 64
87 */
88 FormattedDateInterval& operator=(FormattedDateInterval&& src) U_NOEXCEPT;
89
90 /** @copydoc FormattedValue::toString() */
91 UnicodeString toString(UErrorCode& status) const U_OVERRIDE;
92
93 /** @copydoc FormattedValue::toTempString() */
94 UnicodeString toTempString(UErrorCode& status) const U_OVERRIDE;
95
96 /** @copydoc FormattedValue::appendTo() */
97 Appendable &appendTo(Appendable& appendable, UErrorCode& status) const U_OVERRIDE;
98
99 /** @copydoc FormattedValue::nextPosition() */
100 UBool nextPosition(ConstrainedFieldPosition& cfpos, UErrorCode& status) const U_OVERRIDE;
101
102 private:
103 FormattedDateIntervalData *fData;
104 UErrorCode fErrorCode;
105 explicit FormattedDateInterval(FormattedDateIntervalData *results)
106 : fData(results), fErrorCode(U_ZERO_ERROR) {}
107 explicit FormattedDateInterval(UErrorCode errorCode)
108 : fData(nullptr), fErrorCode(errorCode) {}
109 friend class DateIntervalFormat;
110 };
111
112
113 /**
114 * DateIntervalFormat is a class for formatting and parsing date
115 * intervals in a language-independent manner.
116 * Only formatting is supported, parsing is not supported.
117 *
118 * <P>
119 * Date interval means from one date to another date,
120 * for example, from "Jan 11, 2008" to "Jan 18, 2008".
121 * We introduced class DateInterval to represent it.
122 * DateInterval is a pair of UDate, which is
123 * the standard milliseconds since 24:00 GMT, Jan 1, 1970.
124 *
125 * <P>
126 * DateIntervalFormat formats a DateInterval into
127 * text as compactly as possible.
128 * For example, the date interval format from "Jan 11, 2008" to "Jan 18,. 2008"
129 * is "Jan 11-18, 2008" for English.
130 * And it parses text into DateInterval,
131 * although initially, parsing is not supported.
132 *
133 * <P>
134 * There is no structural information in date time patterns.
135 * For any punctuations and string literals inside a date time pattern,
136 * we do not know whether it is just a separator, or a prefix, or a suffix.
137 * Without such information, so, it is difficult to generate a sub-pattern
138 * (or super-pattern) by algorithm.
139 * So, formatting a DateInterval is pattern-driven. It is very
140 * similar to formatting in SimpleDateFormat.
141 * We introduce class DateIntervalInfo to save date interval
142 * patterns, similar to date time pattern in SimpleDateFormat.
143 *
144 * <P>
145 * Logically, the interval patterns are mappings
146 * from (skeleton, the_largest_different_calendar_field)
147 * to (date_interval_pattern).
148 *
149 * <P>
150 * A skeleton
151 * <ol>
152 * <li>
153 * only keeps the field pattern letter and ignores all other parts
154 * in a pattern, such as space, punctuations, and string literals.
155 * </li>
156 * <li>
157 * hides the order of fields.
158 * </li>
159 * <li>
160 * might hide a field's pattern letter length.
161 * </li>
162 * </ol>
163 *
164 * For those non-digit calendar fields, the pattern letter length is
165 * important, such as MMM, MMMM, and MMMMM; EEE and EEEE,
166 * and the field's pattern letter length is honored.
167 *
168 * For the digit calendar fields, such as M or MM, d or dd, yy or yyyy,
169 * the field pattern length is ignored and the best match, which is defined
170 * in date time patterns, will be returned without honor the field pattern
171 * letter length in skeleton.
172 *
173 * <P>
174 * The calendar fields we support for interval formatting are:
175 * year, month, date, day-of-week, am-pm, hour, hour-of-day, minute, second,
176 * and millisecond.
177 * (though we do not currently have specific intervalFormat date for skeletons
178 * with seconds and millisecond).
179 * Those calendar fields can be defined in the following order:
180 * year > month > date > hour (in day) > minute > second > millisecond
181 *
182 * The largest different calendar fields between 2 calendars is the
183 * first different calendar field in above order.
184 *
185 * For example: the largest different calendar fields between "Jan 10, 2007"
186 * and "Feb 20, 2008" is year.
187 *
188 * <P>
189 * For other calendar fields, the compact interval formatting is not
190 * supported. And the interval format will be fall back to fall-back
191 * patterns, which is mostly "{date0} - {date1}".
192 *
193 * <P>
194 * There is a set of pre-defined static skeleton strings.
195 * There are pre-defined interval patterns for those pre-defined skeletons
196 * in locales' resource files.
197 * For example, for a skeleton UDAT_YEAR_ABBR_MONTH_DAY, which is &quot;yMMMd&quot;,
198 * in en_US, if the largest different calendar field between date1 and date2
199 * is &quot;year&quot;, the date interval pattern is &quot;MMM d, yyyy - MMM d, yyyy&quot;,
200 * such as &quot;Jan 10, 2007 - Jan 10, 2008&quot;.
201 * If the largest different calendar field between date1 and date2 is &quot;month&quot;,
202 * the date interval pattern is &quot;MMM d - MMM d, yyyy&quot;,
203 * such as &quot;Jan 10 - Feb 10, 2007&quot;.
204 * If the largest different calendar field between date1 and date2 is &quot;day&quot;,
205 * the date interval pattern is &quot;MMM d-d, yyyy&quot;, such as &quot;Jan 10-20, 2007&quot;.
206 *
207 * For date skeleton, the interval patterns when year, or month, or date is
208 * different are defined in resource files.
209 * For time skeleton, the interval patterns when am/pm, or hour, or minute is
210 * different are defined in resource files.
211 *
212 * <P>
213 * If a skeleton is not found in a locale's DateIntervalInfo, which means
214 * the interval patterns for the skeleton is not defined in resource file,
215 * the interval pattern will falls back to the interval "fallback" pattern
216 * defined in resource file.
217 * If the interval "fallback" pattern is not defined, the default fall-back
218 * is "{date0} - {data1}".
219 *
220 * <P>
221 * For the combination of date and time,
222 * The rule to generate interval patterns are:
223 * <ol>
224 * <li>
225 * when the year, month, or day differs, falls back to fall-back
226 * interval pattern, which mostly is the concatenate the two original
227 * expressions with a separator between,
228 * For example, interval pattern from "Jan 10, 2007 10:10 am"
229 * to "Jan 11, 2007 10:10am" is
230 * "Jan 10, 2007 10:10 am - Jan 11, 2007 10:10am"
231 * </li>
232 * <li>
233 * otherwise, present the date followed by the range expression
234 * for the time.
235 * For example, interval pattern from "Jan 10, 2007 10:10 am"
236 * to "Jan 10, 2007 11:10am" is "Jan 10, 2007 10:10 am - 11:10am"
237 * </li>
238 * </ol>
239 *
240 *
241 * <P>
242 * If two dates are the same, the interval pattern is the single date pattern.
243 * For example, interval pattern from "Jan 10, 2007" to "Jan 10, 2007" is
244 * "Jan 10, 2007".
245 *
246 * Or if the presenting fields between 2 dates have the exact same values,
247 * the interval pattern is the single date pattern.
248 * For example, if user only requests year and month,
249 * the interval pattern from "Jan 10, 2007" to "Jan 20, 2007" is "Jan 2007".
250 *
251 * <P>
252 * DateIntervalFormat needs the following information for correct
253 * formatting: time zone, calendar type, pattern, date format symbols,
254 * and date interval patterns.
255 * It can be instantiated in 2 ways:
256 * <ol>
257 * <li>
258 * create an instance using default or given locale plus given skeleton.
259 * Users are encouraged to created date interval formatter this way and
260 * to use the pre-defined skeleton macros, such as
261 * UDAT_YEAR_NUM_MONTH, which consists the calendar fields and
262 * the format style.
263 * </li>
264 * <li>
265 * create an instance using default or given locale plus given skeleton
266 * plus a given DateIntervalInfo.
267 * This factory method is for powerful users who want to provide their own
268 * interval patterns.
269 * Locale provides the timezone, calendar, and format symbols information.
270 * Local plus skeleton provides full pattern information.
271 * DateIntervalInfo provides the date interval patterns.
272 * </li>
273 * </ol>
274 *
275 * <P>
276 * For the calendar field pattern letter, such as G, y, M, d, a, h, H, m, s etc.
277 * DateIntervalFormat uses the same syntax as that of
278 * DateTime format.
279 *
280 * <P>
281 * Code Sample: general usage
282 * <pre>
283 * \code
284 * // the date interval object which the DateIntervalFormat formats on
285 * // and parses into
286 * DateInterval* dtInterval = new DateInterval(1000*3600*24, 1000*3600*24*2);
287 * UErrorCode status = U_ZERO_ERROR;
288 * DateIntervalFormat* dtIntervalFmt = DateIntervalFormat::createInstance(
289 * UDAT_YEAR_MONTH_DAY,
290 * Locale("en", "GB", ""), status);
291 * UnicodeUnicodeString dateIntervalString;
292 * FieldPosition pos = 0;
293 * // formatting
294 * dtIntervalFmt->format(dtInterval, dateIntervalUnicodeString, pos, status);
295 * delete dtIntervalFmt;
296 * \endcode
297 * </pre>
298 */
299 class U_I18N_API DateIntervalFormat : public Format {
300 public:
301
302 /**
303 * Construct a DateIntervalFormat from skeleton and the default locale.
304 *
305 * This is a convenient override of
306 * createInstance(const UnicodeString& skeleton, const Locale& locale,
307 * UErrorCode&)
308 * with the value of locale as default locale.
309 *
310 * @param skeleton the skeleton on which interval format based.
311 * @param status output param set to success/failure code on exit
312 * @return a date time interval formatter which the caller owns.
313 * @stable ICU 4.0
314 */
315 static DateIntervalFormat* U_EXPORT2 createInstance(
316 const UnicodeString& skeleton,
317 UErrorCode& status);
318
319 /**
320 * Construct a DateIntervalFormat from skeleton and a given locale.
321 * <P>
322 * In this factory method,
323 * the date interval pattern information is load from resource files.
324 * Users are encouraged to created date interval formatter this way and
325 * to use the pre-defined skeleton macros.
326 *
327 * <P>
328 * There are pre-defined skeletons (defined in udate.h) having predefined
329 * interval patterns in resource files.
330 * Users are encouraged to use those macros.
331 * For example:
332 * DateIntervalFormat::createInstance(UDAT_MONTH_DAY, status)
333 *
334 * The given Locale provides the interval patterns.
335 * For example, for en_GB, if skeleton is UDAT_YEAR_ABBR_MONTH_WEEKDAY_DAY,
336 * which is "yMMMEEEd",
337 * the interval patterns defined in resource file to above skeleton are:
338 * "EEE, d MMM, yyyy - EEE, d MMM, yyyy" for year differs,
339 * "EEE, d MMM - EEE, d MMM, yyyy" for month differs,
340 * "EEE, d - EEE, d MMM, yyyy" for day differs,
341 * @param skeleton the skeleton on which the interval format is based.
342 * @param locale the given locale
343 * @param status output param set to success/failure code on exit
344 * @return a date time interval formatter which the caller owns.
345 * @stable ICU 4.0
346 * <p>
347 * <h4>Sample code</h4>
348 * \snippet samples/dtitvfmtsample/dtitvfmtsample.cpp dtitvfmtPreDefined1
349 * \snippet samples/dtitvfmtsample/dtitvfmtsample.cpp dtitvfmtPreDefined
350 * <p>
351 */
352
353 static DateIntervalFormat* U_EXPORT2 createInstance(
354 const UnicodeString& skeleton,
355 const Locale& locale,
356 UErrorCode& status);
357
358 /**
359 * Construct a DateIntervalFormat from skeleton
360 * DateIntervalInfo, and default locale.
361 *
362 * This is a convenient override of
363 * createInstance(const UnicodeString& skeleton, const Locale& locale,
364 * const DateIntervalInfo& dtitvinf, UErrorCode&)
365 * with the locale value as default locale.
366 *
367 * @param skeleton the skeleton on which interval format based.
368 * @param dtitvinf the DateIntervalInfo object.
369 * @param status output param set to success/failure code on exit
370 * @return a date time interval formatter which the caller owns.
371 * @stable ICU 4.0
372 */
373 static DateIntervalFormat* U_EXPORT2 createInstance(
374 const UnicodeString& skeleton,
375 const DateIntervalInfo& dtitvinf,
376 UErrorCode& status);
377
378 /**
379 * Construct a DateIntervalFormat from skeleton
380 * a DateIntervalInfo, and the given locale.
381 *
382 * <P>
383 * In this factory method, user provides its own date interval pattern
384 * information, instead of using those pre-defined data in resource file.
385 * This factory method is for powerful users who want to provide their own
386 * interval patterns.
387 * <P>
388 * There are pre-defined skeletons (defined in udate.h) having predefined
389 * interval patterns in resource files.
390 * Users are encouraged to use those macros.
391 * For example:
392 * DateIntervalFormat::createInstance(UDAT_MONTH_DAY, status)
393 *
394 * The DateIntervalInfo provides the interval patterns.
395 * and the DateIntervalInfo ownership remains to the caller.
396 *
397 * User are encouraged to set default interval pattern in DateIntervalInfo
398 * as well, if they want to set other interval patterns ( instead of
399 * reading the interval patterns from resource files).
400 * When the corresponding interval pattern for a largest calendar different
401 * field is not found ( if user not set it ), interval format fallback to
402 * the default interval pattern.
403 * If user does not provide default interval pattern, it fallback to
404 * "{date0} - {date1}"
405 *
406 * @param skeleton the skeleton on which interval format based.
407 * @param locale the given locale
408 * @param dtitvinf the DateIntervalInfo object.
409 * @param status output param set to success/failure code on exit
410 * @return a date time interval formatter which the caller owns.
411 * @stable ICU 4.0
412 * <p>
413 * <h4>Sample code</h4>
414 * \snippet samples/dtitvfmtsample/dtitvfmtsample.cpp dtitvfmtPreDefined1
415 * \snippet samples/dtitvfmtsample/dtitvfmtsample.cpp dtitvfmtCustomized
416 * <p>
417 */
418 static DateIntervalFormat* U_EXPORT2 createInstance(
419 const UnicodeString& skeleton,
420 const Locale& locale,
421 const DateIntervalInfo& dtitvinf,
422 UErrorCode& status);
423
424 /**
425 * Destructor.
426 * @stable ICU 4.0
427 */
428 virtual ~DateIntervalFormat();
429
430 /**
431 * Clone this Format object polymorphically. The caller owns the result and
432 * should delete it when done.
433 * @return A copy of the object.
434 * @stable ICU 4.0
435 */
436 virtual DateIntervalFormat* clone() const;
437
438 /**
439 * Return true if the given Format objects are semantically equal. Objects
440 * of different subclasses are considered unequal.
441 * @param other the object to be compared with.
442 * @return true if the given Format objects are semantically equal.
443 * @stable ICU 4.0
444 */
445 virtual UBool operator==(const Format& other) const;
446
447 /**
448 * Return true if the given Format objects are not semantically equal.
449 * Objects of different subclasses are considered unequal.
450 * @param other the object to be compared with.
451 * @return true if the given Format objects are not semantically equal.
452 * @stable ICU 4.0
453 */
454 UBool operator!=(const Format& other) const;
455
456
457 using Format::format;
458
459 /**
460 * Format an object to produce a string. This method handles Formattable
461 * objects with a DateInterval type.
462 * If a the Formattable object type is not a DateInterval,
463 * then it returns a failing UErrorCode.
464 *
465 * @param obj The object to format.
466 * Must be a DateInterval.
467 * @param appendTo Output parameter to receive result.
468 * Result is appended to existing contents.
469 * @param fieldPosition On input: an alignment field, if desired.
470 * On output: the offsets of the alignment field.
471 * There may be multiple instances of a given field type
472 * in an interval format; in this case the fieldPosition
473 * offsets refer to the first instance.
474 * @param status Output param filled with success/failure status.
475 * @return Reference to 'appendTo' parameter.
476 * @stable ICU 4.0
477 */
478 virtual UnicodeString& format(const Formattable& obj,
479 UnicodeString& appendTo,
480 FieldPosition& fieldPosition,
481 UErrorCode& status) const ;
482
483
484
485 /**
486 * Format a DateInterval to produce a string.
487 *
488 * @param dtInterval DateInterval to be formatted.
489 * @param appendTo Output parameter to receive result.
490 * Result is appended to existing contents.
491 * @param fieldPosition On input: an alignment field, if desired.
492 * On output: the offsets of the alignment field.
493 * There may be multiple instances of a given field type
494 * in an interval format; in this case the fieldPosition
495 * offsets refer to the first instance.
496 * @param status Output param filled with success/failure status.
497 * @return Reference to 'appendTo' parameter.
498 * @stable ICU 4.0
499 */
500 UnicodeString& format(const DateInterval* dtInterval,
501 UnicodeString& appendTo,
502 FieldPosition& fieldPosition,
503 UErrorCode& status) const ;
504
505 /**
506 * Format a DateInterval to produce a FormattedDateInterval.
507 *
508 * The FormattedDateInterval exposes field information about the formatted string.
509 *
510 * @param dtInterval DateInterval to be formatted.
511 * @param status Set if an error occurs.
512 * @return A FormattedDateInterval containing the format result.
513 * @stable ICU 64
514 */
515 FormattedDateInterval formatToValue(
516 const DateInterval& dtInterval,
517 UErrorCode& status) const;
518
519 /**
520 * Format 2 Calendars to produce a string.
521 *
522 * Note: "fromCalendar" and "toCalendar" are not const,
523 * since calendar is not const in SimpleDateFormat::format(Calendar&),
524 *
525 * @param fromCalendar calendar set to the from date in date interval
526 * to be formatted into date interval string
527 * @param toCalendar calendar set to the to date in date interval
528 * to be formatted into date interval string
529 * @param appendTo Output parameter to receive result.
530 * Result is appended to existing contents.
531 * @param fieldPosition On input: an alignment field, if desired.
532 * On output: the offsets of the alignment field.
533 * There may be multiple instances of a given field type
534 * in an interval format; in this case the fieldPosition
535 * offsets refer to the first instance.
536 * @param status Output param filled with success/failure status.
537 * Caller needs to make sure it is SUCCESS
538 * at the function entrance
539 * @return Reference to 'appendTo' parameter.
540 * @stable ICU 4.0
541 */
542 UnicodeString& format(Calendar& fromCalendar,
543 Calendar& toCalendar,
544 UnicodeString& appendTo,
545 FieldPosition& fieldPosition,
546 UErrorCode& status) const ;
547
548 /**
549 * Format 2 Calendars to produce a FormattedDateInterval.
550 *
551 * The FormattedDateInterval exposes field information about the formatted string.
552 *
553 * Note: "fromCalendar" and "toCalendar" are not const,
554 * since calendar is not const in SimpleDateFormat::format(Calendar&),
555 *
556 * @param fromCalendar calendar set to the from date in date interval
557 * to be formatted into date interval string
558 * @param toCalendar calendar set to the to date in date interval
559 * to be formatted into date interval string
560 * @param status Set if an error occurs.
561 * @return A FormattedDateInterval containing the format result.
562 * @stable ICU 64
563 */
564 FormattedDateInterval formatToValue(
565 Calendar& fromCalendar,
566 Calendar& toCalendar,
567 UErrorCode& status) const;
568
569 /**
570 * Date interval parsing is not supported. Please do not use.
571 * <P>
572 * This method should handle parsing of
573 * date time interval strings into Formattable objects with
574 * DateInterval type, which is a pair of UDate.
575 * <P>
576 * Before calling, set parse_pos.index to the offset you want to start
577 * parsing at in the source. After calling, parse_pos.index is the end of
578 * the text you parsed. If error occurs, index is unchanged.
579 * <P>
580 * When parsing, leading whitespace is discarded (with a successful parse),
581 * while trailing whitespace is left as is.
582 * <P>
583 * See Format::parseObject() for more.
584 *
585 * @param source The string to be parsed into an object.
586 * @param result Formattable to be set to the parse result.
587 * If parse fails, return contents are undefined.
588 * @param parse_pos The position to start parsing at. Since no parsing
589 * is supported, upon return this param is unchanged.
590 * @return A newly created Formattable* object, or NULL
591 * on failure. The caller owns this and should
592 * delete it when done.
593 * @internal ICU 4.0
594 */
595 virtual void parseObject(const UnicodeString& source,
596 Formattable& result,
597 ParsePosition& parse_pos) const;
598
599
600 /**
601 * Gets the date time interval patterns.
602 * @return the date time interval patterns associated with
603 * this date interval formatter.
604 * @stable ICU 4.0
605 */
606 const DateIntervalInfo* getDateIntervalInfo(void) const;
607
608
609 /**
610 * Set the date time interval patterns.
611 * @param newIntervalPatterns the given interval patterns to copy.
612 * @param status output param set to success/failure code on exit
613 * @stable ICU 4.0
614 */
615 void setDateIntervalInfo(const DateIntervalInfo& newIntervalPatterns,
616 UErrorCode& status);
617
618
619 /**
620 * Gets the date formatter. The DateIntervalFormat instance continues to own
621 * the returned DateFormatter object, and will use and possibly modify it
622 * during format operations. In a multi-threaded environment, the returned
623 * DateFormat can only be used if it is certain that no other threads are
624 * concurrently using this DateIntervalFormatter, even for nominally const
625 * functions.
626 *
627 * @return the date formatter associated with this date interval formatter.
628 * @stable ICU 4.0
629 */
630 const DateFormat* getDateFormat(void) const;
631
632 /**
633 * Returns a reference to the TimeZone used by this DateIntervalFormat's calendar.
634 * @return the time zone associated with the calendar of DateIntervalFormat.
635 * @stable ICU 4.8
636 */
637 virtual const TimeZone& getTimeZone(void) const;
638
639 /**
640 * Sets the time zone for the calendar used by this DateIntervalFormat object. The
641 * caller no longer owns the TimeZone object and should not delete it after this call.
642 * @param zoneToAdopt the TimeZone to be adopted.
643 * @stable ICU 4.8
644 */
645 virtual void adoptTimeZone(TimeZone* zoneToAdopt);
646
647 /**
648 * Sets the time zone for the calendar used by this DateIntervalFormat object.
649 * @param zone the new time zone.
650 * @stable ICU 4.8
651 */
652 virtual void setTimeZone(const TimeZone& zone);
653
654 /**
655 * Return the class ID for this class. This is useful only for comparing to
656 * a return value from getDynamicClassID(). For example:
657 * <pre>
658 * . Base* polymorphic_pointer = createPolymorphicObject();
659 * . if (polymorphic_pointer->getDynamicClassID() ==
660 * . erived::getStaticClassID()) ...
661 * </pre>
662 * @return The class ID for all objects of this class.
663 * @stable ICU 4.0
664 */
665 static UClassID U_EXPORT2 getStaticClassID(void);
666
667 /**
668 * Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This
669 * method is to implement a simple version of RTTI, since not all C++
670 * compilers support genuine RTTI. Polymorphic operator==() and clone()
671 * methods call this method.
672 *
673 * @return The class ID for this object. All objects of a
674 * given class have the same class ID. Objects of
675 * other classes have different class IDs.
676 * @stable ICU 4.0
677 */
678 virtual UClassID getDynamicClassID(void) const;
679
680 protected:
681
682 /**
683 * Copy constructor.
684 * @stable ICU 4.0
685 */
686 DateIntervalFormat(const DateIntervalFormat&);
687
688 /**
689 * Assignment operator.
690 * @stable ICU 4.0
691 */
692 DateIntervalFormat& operator=(const DateIntervalFormat&);
693
694 private:
695
696 /*
697 * This is for ICU internal use only. Please do not use.
698 * Save the interval pattern information.
699 * Interval pattern consists of 2 single date patterns and the separator.
700 * For example, interval pattern "MMM d - MMM d, yyyy" consists
701 * a single date pattern "MMM d", another single date pattern "MMM d, yyyy",
702 * and a separator "-".
703 * The pattern is divided into 2 parts. For above example,
704 * the first part is "MMM d - ", and the second part is "MMM d, yyyy".
705 * Also, the first date appears in an interval pattern could be
706 * the earlier date or the later date.
707 * And such information is saved in the interval pattern as well.
708 */
709 struct PatternInfo {
710 UnicodeString firstPart;
711 UnicodeString secondPart;
712 /**
713 * Whether the first date in interval pattern is later date or not.
714 * Fallback format set the default ordering.
715 * And for a particular interval pattern, the order can be
716 * overriden by prefixing the interval pattern with "latestFirst:" or
717 * "earliestFirst:"
718 * For example, given 2 date, Jan 10, 2007 to Feb 10, 2007.
719 * if the fallback format is "{0} - {1}",
720 * and the pattern is "d MMM - d MMM yyyy", the interval format is
721 * "10 Jan - 10 Feb, 2007".
722 * If the pattern is "latestFirst:d MMM - d MMM yyyy",
723 * the interval format is "10 Feb - 10 Jan, 2007"
724 */
725 UBool laterDateFirst;
726 };
727
728
729 /**
730 * default constructor
731 * @internal (private)
732 */
733 DateIntervalFormat();
734
735 /**
736 * Construct a DateIntervalFormat from DateFormat,
737 * a DateIntervalInfo, and skeleton.
738 * DateFormat provides the timezone, calendar,
739 * full pattern, and date format symbols information.
740 * It should be a SimpleDateFormat object which
741 * has a pattern in it.
742 * the DateIntervalInfo provides the interval patterns.
743 *
744 * Note: the DateIntervalFormat takes ownership of both
745 * DateFormat and DateIntervalInfo objects.
746 * Caller should not delete them.
747 *
748 * @param locale the locale of this date interval formatter.
749 * @param dtItvInfo the DateIntervalInfo object to be adopted.
750 * @param skeleton the skeleton of the date formatter
751 * @param status output param set to success/failure code on exit
752 */
753 DateIntervalFormat(const Locale& locale, DateIntervalInfo* dtItvInfo,
754 const UnicodeString* skeleton, UErrorCode& status);
755
756
757 /**
758 * Construct a DateIntervalFormat from DateFormat
759 * and a DateIntervalInfo.
760 *
761 * It is a wrapper of the constructor.
762 *
763 * @param locale the locale of this date interval formatter.
764 * @param dtitvinf the DateIntervalInfo object to be adopted.
765 * @param skeleton the skeleton of this formatter.
766 * @param status Output param set to success/failure code.
767 * @return a date time interval formatter which the caller owns.
768 */
769 static DateIntervalFormat* U_EXPORT2 create(const Locale& locale,
770 DateIntervalInfo* dtitvinf,
771 const UnicodeString* skeleton,
772 UErrorCode& status);
773
774 /**
775 * Below are for generating interval patterns local to the formatter
776 */
777
778 /** Like fallbackFormat, but only formats the range part of the fallback. */
779 void fallbackFormatRange(
780 Calendar& fromCalendar,
781 Calendar& toCalendar,
782 UnicodeString& appendTo,
783 int8_t& firstIndex,
784 FieldPositionHandler& fphandler,
785 UErrorCode& status) const;
786
787 /**
788 * Format 2 Calendars using fall-back interval pattern
789 *
790 * The full pattern used in this fall-back format is the
791 * full pattern of the date formatter.
792 *
793 * gFormatterMutex must already be locked when calling this function.
794 *
795 * @param fromCalendar calendar set to the from date in date interval
796 * to be formatted into date interval string
797 * @param toCalendar calendar set to the to date in date interval
798 * to be formatted into date interval string
799 * @param fromToOnSameDay TRUE iff from and to dates are on the same day
800 * (any difference is in ampm/hours or below)
801 * @param appendTo Output parameter to receive result.
802 * Result is appended to existing contents.
803 * @param firstIndex See formatImpl for more information.
804 * @param fphandler See formatImpl for more information.
805 * @param status output param set to success/failure code on exit
806 * @return Reference to 'appendTo' parameter.
807 * @internal (private)
808 */
809 UnicodeString& fallbackFormat(Calendar& fromCalendar,
810 Calendar& toCalendar,
811 UBool fromToOnSameDay,
812 UnicodeString& appendTo,
813 int8_t& firstIndex,
814 FieldPositionHandler& fphandler,
815 UErrorCode& status) const;
816
817
818
819 /**
820 * Initialize interval patterns locale to this formatter
821 *
822 * This code is a bit complicated since
823 * 1. the interval patterns saved in resource bundle files are interval
824 * patterns based on date or time only.
825 * It does not have interval patterns based on both date and time.
826 * Interval patterns on both date and time are algorithm generated.
827 *
828 * For example, it has interval patterns on skeleton "dMy" and "hm",
829 * but it does not have interval patterns on skeleton "dMyhm".
830 *
831 * The rule to generate interval patterns for both date and time skeleton are
832 * 1) when the year, month, or day differs, concatenate the two original
833 * expressions with a separator between,
834 * For example, interval pattern from "Jan 10, 2007 10:10 am"
835 * to "Jan 11, 2007 10:10am" is
836 * "Jan 10, 2007 10:10 am - Jan 11, 2007 10:10am"
837 *
838 * 2) otherwise, present the date followed by the range expression
839 * for the time.
840 * For example, interval pattern from "Jan 10, 2007 10:10 am"
841 * to "Jan 10, 2007 11:10am" is
842 * "Jan 10, 2007 10:10 am - 11:10am"
843 *
844 * 2. even a pattern does not request a certain calendar field,
845 * the interval pattern needs to include such field if such fields are
846 * different between 2 dates.
847 * For example, a pattern/skeleton is "hm", but the interval pattern
848 * includes year, month, and date when year, month, and date differs.
849 *
850 *
851 * @param status output param set to success/failure code on exit
852 */
853 void initializePattern(UErrorCode& status);
854
855
856
857 /**
858 * Set fall back interval pattern given a calendar field,
859 * a skeleton, and a date time pattern generator.
860 * @param field the largest different calendar field
861 * @param skeleton a skeleton
862 * @param status output param set to success/failure code on exit
863 */
864 void setFallbackPattern(UCalendarDateFields field,
865 const UnicodeString& skeleton,
866 UErrorCode& status);
867
868
869
870 /**
871 * get separated date and time skeleton from a combined skeleton.
872 *
873 * The difference between date skeleton and normalizedDateSkeleton are:
874 * 1. both 'y' and 'd' are appeared only once in normalizeDateSkeleton
875 * 2. 'E' and 'EE' are normalized into 'EEE'
876 * 3. 'MM' is normalized into 'M'
877 *
878 ** the difference between time skeleton and normalizedTimeSkeleton are:
879 * 1. both 'H' and 'h' are normalized as 'h' in normalized time skeleton,
880 * 2. 'a' is omitted in normalized time skeleton.
881 * 3. there is only one appearance for 'h', 'm','v', 'z' in normalized time
882 * skeleton
883 *
884 *
885 * @param skeleton given combined skeleton.
886 * @param date Output parameter for date only skeleton.
887 * @param normalizedDate Output parameter for normalized date only
888 *
889 * @param time Output parameter for time only skeleton.
890 * @param normalizedTime Output parameter for normalized time only
891 * skeleton.
892 *
893 */
894 static void U_EXPORT2 getDateTimeSkeleton(const UnicodeString& skeleton,
895 UnicodeString& date,
896 UnicodeString& normalizedDate,
897 UnicodeString& time,
898 UnicodeString& normalizedTime);
899
900
901
902 /**
903 * Generate date or time interval pattern from resource,
904 * and set them into the interval pattern locale to this formatter.
905 *
906 * It needs to handle the following:
907 * 1. need to adjust field width.
908 * For example, the interval patterns saved in DateIntervalInfo
909 * includes "dMMMy", but not "dMMMMy".
910 * Need to get interval patterns for dMMMMy from dMMMy.
911 * Another example, the interval patterns saved in DateIntervalInfo
912 * includes "hmv", but not "hmz".
913 * Need to get interval patterns for "hmz' from 'hmv'
914 *
915 * 2. there might be no pattern for 'y' differ for skeleton "Md",
916 * in order to get interval patterns for 'y' differ,
917 * need to look for it from skeleton 'yMd'
918 *
919 * @param dateSkeleton normalized date skeleton
920 * @param timeSkeleton normalized time skeleton
921 * @return whether the resource is found for the skeleton.
922 * TRUE if interval pattern found for the skeleton,
923 * FALSE otherwise.
924 */
925 UBool setSeparateDateTimePtn(const UnicodeString& dateSkeleton,
926 const UnicodeString& timeSkeleton);
927
928
929
930
931 /**
932 * Generate interval pattern from existing resource
933 *
934 * It not only save the interval patterns,
935 * but also return the extended skeleton and its best match skeleton.
936 *
937 * @param field largest different calendar field
938 * @param skeleton skeleton
939 * @param bestSkeleton the best match skeleton which has interval pattern
940 * defined in resource
941 * @param differenceInfo the difference between skeleton and best skeleton
942 * 0 means the best matched skeleton is the same as input skeleton
943 * 1 means the fields are the same, but field width are different
944 * 2 means the only difference between fields are v/z,
945 * -1 means there are other fields difference
946 *
947 * @param extendedSkeleton extended skeleton
948 * @param extendedBestSkeleton extended best match skeleton
949 * @return whether the interval pattern is found
950 * through extending skeleton or not.
951 * TRUE if interval pattern is found by
952 * extending skeleton, FALSE otherwise.
953 */
954 UBool setIntervalPattern(UCalendarDateFields field,
955 const UnicodeString* skeleton,
956 const UnicodeString* bestSkeleton,
957 int8_t differenceInfo,
958 UnicodeString* extendedSkeleton = NULL,
959 UnicodeString* extendedBestSkeleton = NULL);
960
961 /**
962 * Adjust field width in best match interval pattern to match
963 * the field width in input skeleton.
964 *
965 * TODO (xji) make a general solution
966 * The adjusting rule can be:
967 * 1. always adjust
968 * 2. never adjust
969 * 3. default adjust, which means adjust according to the following rules
970 * 3.1 always adjust string, such as MMM and MMMM
971 * 3.2 never adjust between string and numeric, such as MM and MMM
972 * 3.3 always adjust year
973 * 3.4 do not adjust 'd', 'h', or 'm' if h presents
974 * 3.5 do not adjust 'M' if it is numeric(?)
975 *
976 * Since date interval format is well-formed format,
977 * date and time skeletons are normalized previously,
978 * till this stage, the adjust here is only "adjust strings, such as MMM
979 * and MMMM, EEE and EEEE.
980 *
981 * @param inputSkeleton the input skeleton
982 * @param bestMatchSkeleton the best match skeleton
983 * @param bestMatchIntervalPattern the best match interval pattern
984 * @param differenceInfo the difference between 2 skeletons
985 * 1 means only field width differs
986 * 2 means v/z exchange
987 * @param adjustedIntervalPattern adjusted interval pattern
988 */
989 static void U_EXPORT2 adjustFieldWidth(
990 const UnicodeString& inputSkeleton,
991 const UnicodeString& bestMatchSkeleton,
992 const UnicodeString& bestMatchIntervalPattern,
993 int8_t differenceInfo,
994 UnicodeString& adjustedIntervalPattern);
995
996 /**
997 * Concat a single date pattern with a time interval pattern,
998 * set it into the intervalPatterns, while field is time field.
999 * This is used to handle time interval patterns on skeleton with
1000 * both time and date. Present the date followed by
1001 * the range expression for the time.
1002 * @param format date and time format
1003 * @param datePattern date pattern
1004 * @param field time calendar field: AM_PM, HOUR, MINUTE
1005 * @param status output param set to success/failure code on exit
1006 */
1007 void concatSingleDate2TimeInterval(UnicodeString& format,
1008 const UnicodeString& datePattern,
1009 UCalendarDateFields field,
1010 UErrorCode& status);
1011
1012 /**
1013 * check whether a calendar field present in a skeleton.
1014 * @param field calendar field need to check
1015 * @param skeleton given skeleton on which to check the calendar field
1016 * @return true if field present in a skeleton.
1017 */
1018 static UBool U_EXPORT2 fieldExistsInSkeleton(UCalendarDateFields field,
1019 const UnicodeString& skeleton);
1020
1021
1022 /**
1023 * Split interval patterns into 2 part.
1024 * @param intervalPattern interval pattern
1025 * @return the index in interval pattern which split the pattern into 2 part
1026 */
1027 static int32_t U_EXPORT2 splitPatternInto2Part(const UnicodeString& intervalPattern);
1028
1029
1030 /**
1031 * Break interval patterns as 2 part and save them into pattern info.
1032 * @param field calendar field
1033 * @param intervalPattern interval pattern
1034 */
1035 void setIntervalPattern(UCalendarDateFields field,
1036 const UnicodeString& intervalPattern);
1037
1038
1039 /**
1040 * Break interval patterns as 2 part and save them into pattern info.
1041 * @param field calendar field
1042 * @param intervalPattern interval pattern
1043 * @param laterDateFirst whether later date appear first in interval pattern
1044 */
1045 void setIntervalPattern(UCalendarDateFields field,
1046 const UnicodeString& intervalPattern,
1047 UBool laterDateFirst);
1048
1049
1050 /**
1051 * Set pattern information.
1052 *
1053 * @param field calendar field
1054 * @param firstPart the first part in interval pattern
1055 * @param secondPart the second part in interval pattern
1056 * @param laterDateFirst whether the first date in intervalPattern
1057 * is earlier date or later date
1058 */
1059 void setPatternInfo(UCalendarDateFields field,
1060 const UnicodeString* firstPart,
1061 const UnicodeString* secondPart,
1062 UBool laterDateFirst);
1063
1064 /**
1065 * Format 2 Calendars to produce a string.
1066 * Implementation of the similar public format function.
1067 * Must be called with gFormatterMutex already locked.
1068 *
1069 * Note: "fromCalendar" and "toCalendar" are not const,
1070 * since calendar is not const in SimpleDateFormat::format(Calendar&),
1071 *
1072 * @param fromCalendar calendar set to the from date in date interval
1073 * to be formatted into date interval string
1074 * @param toCalendar calendar set to the to date in date interval
1075 * to be formatted into date interval string
1076 * @param appendTo Output parameter to receive result.
1077 * Result is appended to existing contents.
1078 * @param firstIndex 0 if the first output date is fromCalendar;
1079 * 1 if it corresponds to toCalendar;
1080 * -1 if there is only one date printed.
1081 * @param fphandler Handler for field position information.
1082 * The fields will be from the UDateFormatField enum.
1083 * @param status Output param filled with success/failure status.
1084 * Caller needs to make sure it is SUCCESS
1085 * at the function entrance
1086 * @return Reference to 'appendTo' parameter.
1087 * @internal (private)
1088 */
1089 UnicodeString& formatImpl(Calendar& fromCalendar,
1090 Calendar& toCalendar,
1091 UnicodeString& appendTo,
1092 int8_t& firstIndex,
1093 FieldPositionHandler& fphandler,
1094 UErrorCode& status) const ;
1095
1096 /** Version of formatImpl for DateInterval. */
1097 UnicodeString& formatIntervalImpl(const DateInterval& dtInterval,
1098 UnicodeString& appendTo,
1099 int8_t& firstIndex,
1100 FieldPositionHandler& fphandler,
1101 UErrorCode& status) const;
1102
1103
1104 // from calendar field to pattern letter
1105 static const char16_t fgCalendarFieldToPatternLetter[];
1106
1107
1108 /**
1109 * The interval patterns for this locale.
1110 */
1111 DateIntervalInfo* fInfo;
1112
1113 /**
1114 * The DateFormat object used to format single pattern
1115 */
1116 SimpleDateFormat* fDateFormat;
1117
1118 /**
1119 * The 2 calendars with the from and to date.
1120 * could re-use the calendar in fDateFormat,
1121 * but keeping 2 calendars make it clear and clean.
1122 */
1123 Calendar* fFromCalendar;
1124 Calendar* fToCalendar;
1125
1126 Locale fLocale;
1127
1128 /**
1129 * Following are interval information relevant (locale) to this formatter.
1130 */
1131 UnicodeString fSkeleton;
1132 PatternInfo fIntervalPatterns[DateIntervalInfo::kIPI_MAX_INDEX];
1133
1134 /**
1135 * Patterns for fallback formatting.
1136 */
1137 UnicodeString* fDatePattern;
1138 UnicodeString* fTimePattern;
1139 UnicodeString* fDateTimeFormat;
1140 };
1141
1142 inline UBool
1143 DateIntervalFormat::operator!=(const Format& other) const {
1144 return !operator==(other);
1145 }
1146
1147 U_NAMESPACE_END
1148
1149 #endif /* #if !UCONFIG_NO_FORMATTING */
1150
1151 #endif /* U_SHOW_CPLUSPLUS_API */
1152
1153 #endif // _DTITVFMT_H__
1154 //eof