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Edit File: dtitvinf.h
/* ******************************************************************************* * Copyright (C) 2008-2011, International Business Machines Corporation and * others. All Rights Reserved. ******************************************************************************* * * File DTITVINF.H * ******************************************************************************* */ #ifndef __DTITVINF_H__ #define __DTITVINF_H__ #include "unicode/utypes.h" /** * \file * \brief C++ API: Date/Time interval patterns for formatting date/time interval */ #if !UCONFIG_NO_FORMATTING #include "unicode/udat.h" #include "unicode/locid.h" #include "unicode/ucal.h" #include "unicode/dtptngen.h" U_NAMESPACE_BEGIN /** * DateIntervalInfo is a public class for encapsulating localizable * date time interval patterns. It is used by DateIntervalFormat. * * <P> * 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. * * <P> * 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 manupulating it. * * <P> * Logically, the interval patterns are mappings * from (skeleton, the_largest_different_calendar_field) * to (date_interval_pattern). * * <P> * A skeleton * <ol> * <li> * only keeps the field pattern letter and ignores all other parts * in a pattern, such as space, punctuations, and string literals. * <li> * hides the order of fields. * <li> * might hide a field's pattern letter length. * * For those non-digit calendar fields, the pattern letter length is * important, such as MMM, MMMM, and MMMMM; EEE and EEEE, * and the field's pattern letter length is honored. * * For the digit calendar fields, such as M or MM, d or dd, yy or yyyy, * the field pattern length is ignored and the best match, which is defined * in date time patterns, will be returned without honor the field pattern * letter length in skeleton. * </ol> * * <P> * 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. * * <P> * 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. * * * <P> * 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 overriden * 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. * * <P> * 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. * <P> * Users can also create DateIntervalFormat object * by supplying their own interval patterns. * It provides flexibility for power users. * * <P> * 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, and MINUTE. * Interval patterns when other calendar fields are different is not supported. * <P> * DateIntervalInfo objects are cloneable. * When clients obtain a DateIntervalInfo object, * they can feel free to modify it as necessary. * <P> * 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 : public UObject { public: #ifndef U_HIDE_INTERNAL_API /** * 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); #endif /* U_HIDE_INTERNAL_API */ /** * 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(void) 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 UBool 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 */ UBool 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. * <P> * For example: * <pre> * 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); * </pre> * * 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, and MINUTE. * 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; /** * 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; /** * Following is for saving the interval patterns. * We only support interval patterns on * ERA, YEAR, MONTH, DAY, AM_PM, HOUR, and MINUTE */ enum IntervalPatternIndex { kIPI_ERA, kIPI_YEAR, kIPI_MONTH, kIPI_DATE, kIPI_AM_PM, kIPI_HOUR, kIPI_MINUTE, 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 * @internal ICU 4.0 */ 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 * @internal ICU 4.0 */ 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 funtionality 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 * @internal ICU 4.0 */ 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 * @internal ICU 4.0 */ 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. * @internal ICU 4.0 */ 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, and MINUTE, * 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 * @internal ICU 4.0 */ static IntervalPatternIndex U_EXPORT2 calendarFieldToIntervalIndex( UCalendarDateFields field, UErrorCode& status); /** * delete hash table (of type fIntervalPatterns). * * @param hTable hash table to be deleted * @internal ICU 4.0 */ 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 * @internal ICU 4.0 */ 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 * @internal ICU 4.0 */ void copyHash(const Hashtable* source, Hashtable* target, UErrorCode& status); // data members // fallback interval pattern UnicodeString fFallbackIntervalPattern; // default order UBool fFirstDateInPtnIsLaterDate; // HashMap<UnicodeString, UnicodeString[kIPI_MAX_INDEX]> // HashMap( skeleton, pattern[largest_different_field] ) Hashtable* fIntervalPatterns; };// end class DateIntervalInfo inline UBool DateIntervalInfo::operator!=(const DateIntervalInfo& other) const { return !operator==(other); } U_NAMESPACE_END #endif #endif