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intl/icu/source/i18n/unicode/dtitvinf.h

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1 /*
2 *******************************************************************************
3 * Copyright (C) 2008-2011,2013, International Business Machines Corporation and
4 * others. All Rights Reserved.
5 *******************************************************************************
6 *
7 * File DTITVINF.H
8 *
9 *******************************************************************************
10 */
11
12 #ifndef __DTITVINF_H__
13 #define __DTITVINF_H__
14
15 #include "unicode/utypes.h"
16
17 /**
18 * \file
19 * \brief C++ API: Date/Time interval patterns for formatting date/time interval
20 */
21
22 #if !UCONFIG_NO_FORMATTING
23
24 #include "unicode/udat.h"
25 #include "unicode/locid.h"
26 #include "unicode/ucal.h"
27 #include "unicode/dtptngen.h"
28
29 U_NAMESPACE_BEGIN
30
31 /**
32 * DateIntervalInfo is a public class for encapsulating localizable
33 * date time interval patterns. It is used by DateIntervalFormat.
34 *
35 * <P>
36 * For most users, ordinary use of DateIntervalFormat does not need to create
37 * DateIntervalInfo object directly.
38 * DateIntervalFormat will take care of it when creating a date interval
39 * formatter when user pass in skeleton and locale.
40 *
41 * <P>
42 * For power users, who want to create their own date interval patterns,
43 * or want to re-set date interval patterns, they could do so by
44 * directly creating DateIntervalInfo and manupulating it.
45 *
46 * <P>
47 * Logically, the interval patterns are mappings
48 * from (skeleton, the_largest_different_calendar_field)
49 * to (date_interval_pattern).
50 *
51 * <P>
52 * A skeleton
53 * <ol>
54 * <li>
55 * only keeps the field pattern letter and ignores all other parts
56 * in a pattern, such as space, punctuations, and string literals.
57 * <li>
58 * hides the order of fields.
59 * <li>
60 * might hide a field's pattern letter length.
61 *
62 * For those non-digit calendar fields, the pattern letter length is
63 * important, such as MMM, MMMM, and MMMMM; EEE and EEEE,
64 * and the field's pattern letter length is honored.
65 *
66 * For the digit calendar fields, such as M or MM, d or dd, yy or yyyy,
67 * the field pattern length is ignored and the best match, which is defined
68 * in date time patterns, will be returned without honor the field pattern
69 * letter length in skeleton.
70 * </ol>
71 *
72 * <P>
73 * The calendar fields we support for interval formatting are:
74 * year, month, date, day-of-week, am-pm, hour, hour-of-day, and minute.
75 * Those calendar fields can be defined in the following order:
76 * year > month > date > am-pm > hour > minute
77 *
78 * The largest different calendar fields between 2 calendars is the
79 * first different calendar field in above order.
80 *
81 * For example: the largest different calendar fields between &quot;Jan 10, 2007&quot;
82 * and &quot;Feb 20, 2008&quot; is year.
83 *
84 * <P>
85 * There is a set of pre-defined static skeleton strings.
86 * There are pre-defined interval patterns for those pre-defined skeletons
87 * in locales' resource files.
88 * For example, for a skeleton UDAT_YEAR_ABBR_MONTH_DAY, which is &quot;yMMMd&quot;,
89 * in en_US, if the largest different calendar field between date1 and date2
90 * is &quot;year&quot;, the date interval pattern is &quot;MMM d, yyyy - MMM d, yyyy&quot;,
91 * such as &quot;Jan 10, 2007 - Jan 10, 2008&quot;.
92 * If the largest different calendar field between date1 and date2 is &quot;month&quot;,
93 * the date interval pattern is &quot;MMM d - MMM d, yyyy&quot;,
94 * such as &quot;Jan 10 - Feb 10, 2007&quot;.
95 * If the largest different calendar field between date1 and date2 is &quot;day&quot;,
96 * the date interval pattern is &quot;MMM d-d, yyyy&quot;, such as &quot;Jan 10-20, 2007&quot;.
97 *
98 * For date skeleton, the interval patterns when year, or month, or date is
99 * different are defined in resource files.
100 * For time skeleton, the interval patterns when am/pm, or hour, or minute is
101 * different are defined in resource files.
102 *
103 *
104 * <P>
105 * There are 2 dates in interval pattern. For most locales, the first date
106 * in an interval pattern is the earlier date. There might be a locale in which
107 * the first date in an interval pattern is the later date.
108 * We use fallback format for the default order for the locale.
109 * For example, if the fallback format is &quot;{0} - {1}&quot;, it means
110 * the first date in the interval pattern for this locale is earlier date.
111 * If the fallback format is &quot;{1} - {0}&quot;, it means the first date is the
112 * later date.
113 * For a particular interval pattern, the default order can be overriden
114 * by prefixing &quot;latestFirst:&quot; or &quot;earliestFirst:&quot; to the interval pattern.
115 * For example, if the fallback format is &quot;{0}-{1}&quot;,
116 * but for skeleton &quot;yMMMd&quot;, the interval pattern when day is different is
117 * &quot;latestFirst:d-d MMM yy&quot;, it means by default, the first date in interval
118 * pattern is the earlier date. But for skeleton &quot;yMMMd&quot;, when day is different,
119 * the first date in &quot;d-d MMM yy&quot; is the later date.
120 *
121 * <P>
122 * The recommended way to create a DateIntervalFormat object is to pass in
123 * the locale.
124 * By using a Locale parameter, the DateIntervalFormat object is
125 * initialized with the pre-defined interval patterns for a given or
126 * default locale.
127 * <P>
128 * Users can also create DateIntervalFormat object
129 * by supplying their own interval patterns.
130 * It provides flexibility for power users.
131 *
132 * <P>
133 * After a DateIntervalInfo object is created, clients may modify
134 * the interval patterns using setIntervalPattern function as so desired.
135 * Currently, users can only set interval patterns when the following
136 * calendar fields are different: ERA, YEAR, MONTH, DATE, DAY_OF_MONTH,
137 * DAY_OF_WEEK, AM_PM, HOUR, HOUR_OF_DAY, and MINUTE.
138 * Interval patterns when other calendar fields are different is not supported.
139 * <P>
140 * DateIntervalInfo objects are cloneable.
141 * When clients obtain a DateIntervalInfo object,
142 * they can feel free to modify it as necessary.
143 * <P>
144 * DateIntervalInfo are not expected to be subclassed.
145 * Data for a calendar is loaded out of resource bundles.
146 * Through ICU 4.4, date interval patterns are only supported in the Gregorian
147 * calendar; non-Gregorian calendars are supported from ICU 4.4.1.
148 * @stable ICU 4.0
149 **/
150
151 class U_I18N_API DateIntervalInfo : public UObject {
152 public:
153 #ifndef U_HIDE_INTERNAL_API
154 /**
155 * Default constructor.
156 * It does not initialize any interval patterns except
157 * that it initialize default fall-back pattern as "{0} - {1}",
158 * which can be reset by setFallbackIntervalPattern().
159 * It should be followed by setFallbackIntervalPattern() and
160 * setIntervalPattern(),
161 * and is recommended to be used only for power users who
162 * wants to create their own interval patterns and use them to create
163 * date interval formatter.
164 * @param status output param set to success/failure code on exit
165 * @internal ICU 4.0
166 */
167 DateIntervalInfo(UErrorCode& status);
168 #endif /* U_HIDE_INTERNAL_API */
169
170
171 /**
172 * Construct DateIntervalInfo for the given locale,
173 * @param locale the interval patterns are loaded from the appropriate calendar
174 * data (specified calendar or default calendar) in this locale.
175 * @param status output param set to success/failure code on exit
176 * @stable ICU 4.0
177 */
178 DateIntervalInfo(const Locale& locale, UErrorCode& status);
179
180
181 /**
182 * Copy constructor.
183 * @stable ICU 4.0
184 */
185 DateIntervalInfo(const DateIntervalInfo&);
186
187 /**
188 * Assignment operator
189 * @stable ICU 4.0
190 */
191 DateIntervalInfo& operator=(const DateIntervalInfo&);
192
193 /**
194 * Clone this object polymorphically.
195 * The caller owns the result and should delete it when done.
196 * @return a copy of the object
197 * @stable ICU 4.0
198 */
199 virtual DateIntervalInfo* clone(void) const;
200
201 /**
202 * Destructor.
203 * It is virtual to be safe, but it is not designed to be subclassed.
204 * @stable ICU 4.0
205 */
206 virtual ~DateIntervalInfo();
207
208
209 /**
210 * Return true if another object is semantically equal to this one.
211 *
212 * @param other the DateIntervalInfo object to be compared with.
213 * @return true if other is semantically equal to this.
214 * @stable ICU 4.0
215 */
216 virtual UBool operator==(const DateIntervalInfo& other) const;
217
218 /**
219 * Return true if another object is semantically unequal to this one.
220 *
221 * @param other the DateIntervalInfo object to be compared with.
222 * @return true if other is semantically unequal to this.
223 * @stable ICU 4.0
224 */
225 UBool operator!=(const DateIntervalInfo& other) const;
226
227
228
229 /**
230 * Provides a way for client to build interval patterns.
231 * User could construct DateIntervalInfo by providing a list of skeletons
232 * and their patterns.
233 * <P>
234 * For example:
235 * <pre>
236 * UErrorCode status = U_ZERO_ERROR;
237 * DateIntervalInfo dIntervalInfo = new DateIntervalInfo();
238 * dIntervalInfo->setFallbackIntervalPattern("{0} ~ {1}");
239 * dIntervalInfo->setIntervalPattern("yMd", UCAL_YEAR, "'from' yyyy-M-d 'to' yyyy-M-d", status);
240 * dIntervalInfo->setIntervalPattern("yMMMd", UCAL_MONTH, "'from' yyyy MMM d 'to' MMM d", status);
241 * dIntervalInfo->setIntervalPattern("yMMMd", UCAL_DAY, "yyyy MMM d-d", status, status);
242 * </pre>
243 *
244 * Restriction:
245 * Currently, users can only set interval patterns when the following
246 * calendar fields are different: ERA, YEAR, MONTH, DATE, DAY_OF_MONTH,
247 * DAY_OF_WEEK, AM_PM, HOUR, HOUR_OF_DAY, and MINUTE.
248 * Interval patterns when other calendar fields are different are
249 * not supported.
250 *
251 * @param skeleton the skeleton on which interval pattern based
252 * @param lrgDiffCalUnit the largest different calendar unit.
253 * @param intervalPattern the interval pattern on the largest different
254 * calendar unit.
255 * For example, if lrgDiffCalUnit is
256 * "year", the interval pattern for en_US when year
257 * is different could be "'from' yyyy 'to' yyyy".
258 * @param status output param set to success/failure code on exit
259 * @stable ICU 4.0
260 */
261 void setIntervalPattern(const UnicodeString& skeleton,
262 UCalendarDateFields lrgDiffCalUnit,
263 const UnicodeString& intervalPattern,
264 UErrorCode& status);
265
266 /**
267 * Get the interval pattern given skeleton and
268 * the largest different calendar field.
269 * @param skeleton the skeleton
270 * @param field the largest different calendar field
271 * @param result output param to receive the pattern
272 * @param status output param set to success/failure code on exit
273 * @return a reference to 'result'
274 * @stable ICU 4.0
275 */
276 UnicodeString& getIntervalPattern(const UnicodeString& skeleton,
277 UCalendarDateFields field,
278 UnicodeString& result,
279 UErrorCode& status) const;
280
281 /**
282 * Get the fallback interval pattern.
283 * @param result output param to receive the pattern
284 * @return a reference to 'result'
285 * @stable ICU 4.0
286 */
287 UnicodeString& getFallbackIntervalPattern(UnicodeString& result) const;
288
289
290 /**
291 * Re-set the fallback interval pattern.
292 *
293 * In construction, default fallback pattern is set as "{0} - {1}".
294 * And constructor taking locale as parameter will set the
295 * fallback pattern as what defined in the locale resource file.
296 *
297 * This method provides a way for user to replace the fallback pattern.
298 *
299 * @param fallbackPattern fall-back interval pattern.
300 * @param status output param set to success/failure code on exit
301 * @stable ICU 4.0
302 */
303 void setFallbackIntervalPattern(const UnicodeString& fallbackPattern,
304 UErrorCode& status);
305
306
307 /** Get default order -- whether the first date in pattern is later date
308 or not.
309 * return default date ordering in interval pattern. TRUE if the first date
310 * in pattern is later date, FALSE otherwise.
311 * @stable ICU 4.0
312 */
313 UBool getDefaultOrder() const;
314
315
316 /**
317 * ICU "poor man's RTTI", returns a UClassID for the actual class.
318 *
319 * @stable ICU 4.0
320 */
321 virtual UClassID getDynamicClassID() const;
322
323 /**
324 * ICU "poor man's RTTI", returns a UClassID for this class.
325 *
326 * @stable ICU 4.0
327 */
328 static UClassID U_EXPORT2 getStaticClassID();
329
330
331 private:
332 /**
333 * DateIntervalFormat will need access to
334 * getBestSkeleton(), parseSkeleton(), enum IntervalPatternIndex,
335 * and calendarFieldToPatternIndex().
336 *
337 * Instead of making above public,
338 * make DateIntervalFormat a friend of DateIntervalInfo.
339 */
340 friend class DateIntervalFormat;
341
342 /**
343 * Following is for saving the interval patterns.
344 * We only support interval patterns on
345 * ERA, YEAR, MONTH, DAY, AM_PM, HOUR, and MINUTE
346 */
347 enum IntervalPatternIndex
348 {
349 kIPI_ERA,
350 kIPI_YEAR,
351 kIPI_MONTH,
352 kIPI_DATE,
353 kIPI_AM_PM,
354 kIPI_HOUR,
355 kIPI_MINUTE,
356 kIPI_MAX_INDEX
357 };
358 public:
359 #ifndef U_HIDE_INTERNAL_API
360 /**
361 * Max index for stored interval patterns
362 * @internal ICU 4.4
363 */
364 enum {
365 kMaxIntervalPatternIndex = kIPI_MAX_INDEX
366 };
367 #endif /* U_HIDE_INTERNAL_API */
368 private:
369
370
371 /**
372 * Initialize the DateIntervalInfo from locale
373 * @param locale the given locale.
374 * @param status output param set to success/failure code on exit
375 */
376 void initializeData(const Locale& locale, UErrorCode& status);
377
378
379 /* Set Interval pattern.
380 *
381 * It sets interval pattern into the hash map.
382 *
383 * @param skeleton skeleton on which the interval pattern based
384 * @param lrgDiffCalUnit the largest different calendar unit.
385 * @param intervalPattern the interval pattern on the largest different
386 * calendar unit.
387 * @param status output param set to success/failure code on exit
388 */
389 void setIntervalPatternInternally(const UnicodeString& skeleton,
390 UCalendarDateFields lrgDiffCalUnit,
391 const UnicodeString& intervalPattern,
392 UErrorCode& status);
393
394
395 /**given an input skeleton, get the best match skeleton
396 * which has pre-defined interval pattern in resource file.
397 * Also return the difference between the input skeleton
398 * and the best match skeleton.
399 *
400 * TODO (xji): set field weight or
401 * isolate the funtionality in DateTimePatternGenerator
402 * @param skeleton input skeleton
403 * @param bestMatchDistanceInfo the difference between input skeleton
404 * and best match skeleton.
405 * 0, if there is exact match for input skeleton
406 * 1, if there is only field width difference between
407 * the best match and the input skeleton
408 * 2, the only field difference is 'v' and 'z'
409 * -1, if there is calendar field difference between
410 * the best match and the input skeleton
411 * @return best match skeleton
412 */
413 const UnicodeString* getBestSkeleton(const UnicodeString& skeleton,
414 int8_t& bestMatchDistanceInfo) const;
415
416
417 /**
418 * Parse skeleton, save each field's width.
419 * It is used for looking for best match skeleton,
420 * and adjust pattern field width.
421 * @param skeleton skeleton to be parsed
422 * @param skeletonFieldWidth parsed skeleton field width
423 */
424 static void U_EXPORT2 parseSkeleton(const UnicodeString& skeleton,
425 int32_t* skeletonFieldWidth);
426
427
428 /**
429 * Check whether one field width is numeric while the other is string.
430 *
431 * TODO (xji): make it general
432 *
433 * @param fieldWidth one field width
434 * @param anotherFieldWidth another field width
435 * @param patternLetter pattern letter char
436 * @return true if one field width is numeric and the other is string,
437 * false otherwise.
438 */
439 static UBool U_EXPORT2 stringNumeric(int32_t fieldWidth,
440 int32_t anotherFieldWidth,
441 char patternLetter);
442
443
444 /**
445 * Convert calendar field to the interval pattern index in
446 * hash table.
447 *
448 * Since we only support the following calendar fields:
449 * ERA, YEAR, MONTH, DATE, DAY_OF_MONTH, DAY_OF_WEEK,
450 * AM_PM, HOUR, HOUR_OF_DAY, and MINUTE,
451 * We reserve only 4 interval patterns for a skeleton.
452 *
453 * @param field calendar field
454 * @param status output param set to success/failure code on exit
455 * @return interval pattern index in hash table
456 */
457 static IntervalPatternIndex U_EXPORT2 calendarFieldToIntervalIndex(
458 UCalendarDateFields field,
459 UErrorCode& status);
460
461
462 /**
463 * delete hash table (of type fIntervalPatterns).
464 *
465 * @param hTable hash table to be deleted
466 */
467 void deleteHash(Hashtable* hTable);
468
469
470 /**
471 * initialize hash table (of type fIntervalPatterns).
472 *
473 * @param status output param set to success/failure code on exit
474 * @return hash table initialized
475 */
476 Hashtable* initHash(UErrorCode& status);
477
478
479
480 /**
481 * copy hash table (of type fIntervalPatterns).
482 *
483 * @param source the source to copy from
484 * @param target the target to copy to
485 * @param status output param set to success/failure code on exit
486 */
487 void copyHash(const Hashtable* source, Hashtable* target, UErrorCode& status);
488
489
490 // data members
491 // fallback interval pattern
492 UnicodeString fFallbackIntervalPattern;
493 // default order
494 UBool fFirstDateInPtnIsLaterDate;
495
496 // HashMap<UnicodeString, UnicodeString[kIPI_MAX_INDEX]>
497 // HashMap( skeleton, pattern[largest_different_field] )
498 Hashtable* fIntervalPatterns;
499
500 };// end class DateIntervalInfo
501
502
503 inline UBool
504 DateIntervalInfo::operator!=(const DateIntervalInfo& other) const {
505 return !operator==(other);
506 }
507
508
509 U_NAMESPACE_END
510
511 #endif
512
513 #endif
514

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