/usr/include/unicode/dtitvinf.h (19072B)
* For most users, ordinary use of DateIntervalFormat does not need to create * DateIntervalInfo object directly. * DateIntervalFormat will take care of it when creating a date interval * formatter when user pass in skeleton and locale. * *
* For power users, who want to create their own date interval patterns, * or want to re-set date interval patterns, they could do so by * directly creating DateIntervalInfo and manipulating it. * *
* Logically, the interval patterns are mappings * from (skeleton, the_largest_different_calendar_field) * to (date_interval_pattern). * *
* A skeleton *
* The calendar fields we support for interval formatting are: * year, month, date, day-of-week, am-pm, hour, hour-of-day, and minute. * Those calendar fields can be defined in the following order: * year > month > date > am-pm > hour > minute * * The largest different calendar fields between 2 calendars is the * first different calendar field in above order. * * For example: the largest different calendar fields between "Jan 10, 2007" * and "Feb 20, 2008" is year. * *
* There is a set of pre-defined static skeleton strings. * There are pre-defined interval patterns for those pre-defined skeletons * in locales' resource files. * For example, for a skeleton UDAT_YEAR_ABBR_MONTH_DAY, which is "yMMMd", * in en_US, if the largest different calendar field between date1 and date2 * is "year", the date interval pattern is "MMM d, yyyy - MMM d, yyyy", * such as "Jan 10, 2007 - Jan 10, 2008". * If the largest different calendar field between date1 and date2 is "month", * the date interval pattern is "MMM d - MMM d, yyyy", * such as "Jan 10 - Feb 10, 2007". * If the largest different calendar field between date1 and date2 is "day", * the date interval pattern is "MMM d-d, yyyy", such as "Jan 10-20, 2007". * * For date skeleton, the interval patterns when year, or month, or date is * different are defined in resource files. * For time skeleton, the interval patterns when am/pm, or hour, or minute is * different are defined in resource files. * * *
* There are 2 dates in interval pattern. For most locales, the first date * in an interval pattern is the earlier date. There might be a locale in which * the first date in an interval pattern is the later date. * We use fallback format for the default order for the locale. * For example, if the fallback format is "{0} - {1}", it means * the first date in the interval pattern for this locale is earlier date. * If the fallback format is "{1} - {0}", it means the first date is the * later date. * For a particular interval pattern, the default order can be overridden * by prefixing "latestFirst:" or "earliestFirst:" to the interval pattern. * For example, if the fallback format is "{0}-{1}", * but for skeleton "yMMMd", the interval pattern when day is different is * "latestFirst:d-d MMM yy", it means by default, the first date in interval * pattern is the earlier date. But for skeleton "yMMMd", when day is different, * the first date in "d-d MMM yy" is the later date. * *
* The recommended way to create a DateIntervalFormat object is to pass in * the locale. * By using a Locale parameter, the DateIntervalFormat object is * initialized with the pre-defined interval patterns for a given or * default locale. *
* Users can also create DateIntervalFormat object * by supplying their own interval patterns. * It provides flexibility for power users. * *
* After a DateIntervalInfo object is created, clients may modify * the interval patterns using setIntervalPattern function as so desired. * Currently, users can only set interval patterns when the following * calendar fields are different: ERA, YEAR, MONTH, DATE, DAY_OF_MONTH, * DAY_OF_WEEK, AM_PM, HOUR, HOUR_OF_DAY, MINUTE, SECOND, and MILLISECOND. * Interval patterns when other calendar fields are different is not supported. *
* DateIntervalInfo objects are cloneable. * When clients obtain a DateIntervalInfo object, * they can feel free to modify it as necessary. *
* DateIntervalInfo are not expected to be subclassed. * Data for a calendar is loaded out of resource bundles. * Through ICU 4.4, date interval patterns are only supported in the Gregorian * calendar; non-Gregorian calendars are supported from ICU 4.4.1. * @stable ICU 4.0 **/ class U_I18N_API DateIntervalInfo U_FINAL : public UObject { public: /** * Default constructor. * It does not initialize any interval patterns except * that it initialize default fall-back pattern as "{0} - {1}", * which can be reset by setFallbackIntervalPattern(). * It should be followed by setFallbackIntervalPattern() and * setIntervalPattern(), * and is recommended to be used only for power users who * wants to create their own interval patterns and use them to create * date interval formatter. * @param status output param set to success/failure code on exit * @internal ICU 4.0 */ DateIntervalInfo(UErrorCode& status); /** * Construct DateIntervalInfo for the given locale, * @param locale the interval patterns are loaded from the appropriate calendar * data (specified calendar or default calendar) in this locale. * @param status output param set to success/failure code on exit * @stable ICU 4.0 */ DateIntervalInfo(const Locale& locale, UErrorCode& status); /** * Copy constructor. * @stable ICU 4.0 */ DateIntervalInfo(const DateIntervalInfo&); /** * Assignment operator * @stable ICU 4.0 */ DateIntervalInfo& operator=(const DateIntervalInfo&); /** * Clone this object polymorphically. * The caller owns the result and should delete it when done. * @return a copy of the object * @stable ICU 4.0 */ virtual DateIntervalInfo* clone() const; /** * Destructor. * It is virtual to be safe, but it is not designed to be subclassed. * @stable ICU 4.0 */ virtual ~DateIntervalInfo(); /** * Return true if another object is semantically equal to this one. * * @param other the DateIntervalInfo object to be compared with. * @return true if other is semantically equal to this. * @stable ICU 4.0 */ virtual bool operator==(const DateIntervalInfo& other) const; /** * Return true if another object is semantically unequal to this one. * * @param other the DateIntervalInfo object to be compared with. * @return true if other is semantically unequal to this. * @stable ICU 4.0 */ bool operator!=(const DateIntervalInfo& other) const; /** * Provides a way for client to build interval patterns. * User could construct DateIntervalInfo by providing a list of skeletons * and their patterns. *
* For example: *
* UErrorCode status = U_ZERO_ERROR;
* DateIntervalInfo dIntervalInfo = new DateIntervalInfo();
* dIntervalInfo->setFallbackIntervalPattern("{0} ~ {1}");
* dIntervalInfo->setIntervalPattern("yMd", UCAL_YEAR, "'from' yyyy-M-d 'to' yyyy-M-d", status);
* dIntervalInfo->setIntervalPattern("yMMMd", UCAL_MONTH, "'from' yyyy MMM d 'to' MMM d", status);
* dIntervalInfo->setIntervalPattern("yMMMd", UCAL_DAY, "yyyy MMM d-d", status, status);
*
*
* Restriction:
* Currently, users can only set interval patterns when the following
* calendar fields are different: ERA, YEAR, MONTH, DATE, DAY_OF_MONTH,
* DAY_OF_WEEK, AM_PM, HOUR, HOUR_OF_DAY, MINUTE, SECOND and MILLISECOND.
* Interval patterns when other calendar fields are different are
* not supported.
*
* @param skeleton the skeleton on which interval pattern based
* @param lrgDiffCalUnit the largest different calendar unit.
* @param intervalPattern the interval pattern on the largest different
* calendar unit.
* For example, if lrgDiffCalUnit is
* "year", the interval pattern for en_US when year
* is different could be "'from' yyyy 'to' yyyy".
* @param status output param set to success/failure code on exit
* @stable ICU 4.0
*/
void setIntervalPattern(const UnicodeString& skeleton,
UCalendarDateFields lrgDiffCalUnit,
const UnicodeString& intervalPattern,
UErrorCode& status);
/**
* Get the interval pattern given skeleton and
* the largest different calendar field.
* @param skeleton the skeleton
* @param field the largest different calendar field
* @param result output param to receive the pattern
* @param status output param set to success/failure code on exit
* @return a reference to 'result'
* @stable ICU 4.0
*/
UnicodeString& getIntervalPattern(const UnicodeString& skeleton,
UCalendarDateFields field,
UnicodeString& result,
UErrorCode& status) const;
/**
* Get the fallback interval pattern.
* @param result output param to receive the pattern
* @return a reference to 'result'
* @stable ICU 4.0
*/
UnicodeString& getFallbackIntervalPattern(UnicodeString& result) const;
/**
* Re-set the fallback interval pattern.
*
* In construction, default fallback pattern is set as "{0} - {1}".
* And constructor taking locale as parameter will set the
* fallback pattern as what defined in the locale resource file.
*
* This method provides a way for user to replace the fallback pattern.
*
* @param fallbackPattern fall-back interval pattern.
* @param status output param set to success/failure code on exit
* @stable ICU 4.0
*/
void setFallbackIntervalPattern(const UnicodeString& fallbackPattern,
UErrorCode& status);
/** Get default order -- whether the first date in pattern is later date
or not.
* return default date ordering in interval pattern. true if the first date
* in pattern is later date, false otherwise.
* @stable ICU 4.0
*/
UBool getDefaultOrder() const;
/**
* ICU "poor man's RTTI", returns a UClassID for the actual class.
*
* @stable ICU 4.0
*/
virtual UClassID getDynamicClassID() const override;
/**
* ICU "poor man's RTTI", returns a UClassID for this class.
*
* @stable ICU 4.0
*/
static UClassID U_EXPORT2 getStaticClassID();
private:
/**
* DateIntervalFormat will need access to
* getBestSkeleton(), parseSkeleton(), enum IntervalPatternIndex,
* and calendarFieldToPatternIndex().
*
* Instead of making above public,
* make DateIntervalFormat a friend of DateIntervalInfo.
*/
friend class DateIntervalFormat;
/**
* Internal struct used to load resource bundle data.
*/
struct DateIntervalSink;
/**
* Following is for saving the interval patterns.
* We only support interval patterns on
* ERA, YEAR, MONTH, DAY, AM_PM, HOUR, MINUTE, SECOND and MILLISECOND.
*/
enum IntervalPatternIndex
{
kIPI_ERA,
kIPI_YEAR,
kIPI_MONTH,
kIPI_DATE,
kIPI_AM_PM,
kIPI_HOUR,
kIPI_MINUTE,
kIPI_SECOND,
kIPI_MILLISECOND,
kIPI_MAX_INDEX
};
public:
#ifndef U_HIDE_INTERNAL_API
/**
* Max index for stored interval patterns
* @internal ICU 4.4
*/
enum {
kMaxIntervalPatternIndex = kIPI_MAX_INDEX
};
#endif /* U_HIDE_INTERNAL_API */
private:
/**
* Initialize the DateIntervalInfo from locale
* @param locale the given locale.
* @param status output param set to success/failure code on exit
*/
void initializeData(const Locale& locale, UErrorCode& status);
/* Set Interval pattern.
*
* It sets interval pattern into the hash map.
*
* @param skeleton skeleton on which the interval pattern based
* @param lrgDiffCalUnit the largest different calendar unit.
* @param intervalPattern the interval pattern on the largest different
* calendar unit.
* @param status output param set to success/failure code on exit
*/
void setIntervalPatternInternally(const UnicodeString& skeleton,
UCalendarDateFields lrgDiffCalUnit,
const UnicodeString& intervalPattern,
UErrorCode& status);
/**given an input skeleton, get the best match skeleton
* which has pre-defined interval pattern in resource file.
* Also return the difference between the input skeleton
* and the best match skeleton.
*
* TODO (xji): set field weight or
* isolate the functionality in DateTimePatternGenerator
* @param skeleton input skeleton
* @param bestMatchDistanceInfo the difference between input skeleton
* and best match skeleton.
* 0, if there is exact match for input skeleton
* 1, if there is only field width difference between
* the best match and the input skeleton
* 2, the only field difference is 'v' and 'z'
* -1, if there is calendar field difference between
* the best match and the input skeleton
* @return best match skeleton
*/
const UnicodeString* getBestSkeleton(const UnicodeString& skeleton,
int8_t& bestMatchDistanceInfo) const;
/**
* Parse skeleton, save each field's width.
* It is used for looking for best match skeleton,
* and adjust pattern field width.
* @param skeleton skeleton to be parsed
* @param skeletonFieldWidth parsed skeleton field width
*/
static void U_EXPORT2 parseSkeleton(const UnicodeString& skeleton,
int32_t* skeletonFieldWidth);
/**
* Check whether one field width is numeric while the other is string.
*
* TODO (xji): make it general
*
* @param fieldWidth one field width
* @param anotherFieldWidth another field width
* @param patternLetter pattern letter char
* @return true if one field width is numeric and the other is string,
* false otherwise.
*/
static UBool U_EXPORT2 stringNumeric(int32_t fieldWidth,
int32_t anotherFieldWidth,
char patternLetter);
/**
* Convert calendar field to the interval pattern index in
* hash table.
*
* Since we only support the following calendar fields:
* ERA, YEAR, MONTH, DATE, DAY_OF_MONTH, DAY_OF_WEEK,
* AM_PM, HOUR, HOUR_OF_DAY, MINUTE, SECOND, and MILLISECOND.
* We reserve only 4 interval patterns for a skeleton.
*
* @param field calendar field
* @param status output param set to success/failure code on exit
* @return interval pattern index in hash table
*/
static IntervalPatternIndex U_EXPORT2 calendarFieldToIntervalIndex(
UCalendarDateFields field,
UErrorCode& status);
/**
* delete hash table (of type fIntervalPatterns).
*
* @param hTable hash table to be deleted
*/
void deleteHash(Hashtable* hTable);
/**
* initialize hash table (of type fIntervalPatterns).
*
* @param status output param set to success/failure code on exit
* @return hash table initialized
*/
Hashtable* initHash(UErrorCode& status);
/**
* copy hash table (of type fIntervalPatterns).
*
* @param source the source to copy from
* @param target the target to copy to
* @param status output param set to success/failure code on exit
*/
void copyHash(const Hashtable* source, Hashtable* target, UErrorCode& status);
// data members
// fallback interval pattern
UnicodeString fFallbackIntervalPattern;
// default order
UBool fFirstDateInPtnIsLaterDate;
// HashMap