// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ******************************************************************************* * Copyright (C) 2008-2016, International Business Machines Corporation and * others. All Rights Reserved. ******************************************************************************* * * File DTITVINF.H * ******************************************************************************* */ #ifndef __DTITVINF_H__ #define __DTITVINF_H__ #include "unicode/utypes.h" #if U_SHOW_CPLUSPLUS_API /** * \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 manipulating 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 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. * * <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, MINUTE, SECOND, and MILLISECOND. * 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 final : public UObject { … };// end class DateIntervalInfo inline bool DateIntervalInfo::operator!=(const DateIntervalInfo& other) const { … } U_NAMESPACE_END #endif #endif /* U_SHOW_CPLUSPLUS_API */ #endif
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