1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
4 *******************************************************************************
5 * Copyright (C) 2007-2016, International Business Machines Corporation and *
6 * others. All Rights Reserved. *
7 *******************************************************************************
13 #include "unicode/utypes.h"
17 * \brief C++ API: Format and parse relative dates and times.
20 #if !UCONFIG_NO_FORMATTING
22 #include "unicode/datefmt.h"
23 #include "unicode/smpdtfmt.h"
24 #include "unicode/brkiter.h"
28 // forward declarations
29 class DateFormatSymbols
;
30 class SimpleFormatter
;
32 // internal structure used for caching strings
33 struct URelativeString
;
36 * This class is normally accessed using the kRelative or k...Relative values of EStyle as
37 * parameters to DateFormat::createDateInstance.
40 * DateFormat *fullrelative = DateFormat::createDateInstance(DateFormat::kFullRelative, loc);
45 class RelativeDateFormat
: public DateFormat
{
47 RelativeDateFormat( UDateFormatStyle timeStyle
, UDateFormatStyle dateStyle
, const Locale
& locale
, UErrorCode
& status
);
54 RelativeDateFormat(const RelativeDateFormat
&);
57 * Assignment operator.
60 RelativeDateFormat
& operator=(const RelativeDateFormat
&);
66 virtual ~RelativeDateFormat();
69 * Clone this Format object polymorphically. The caller owns the result and
70 * should delete it when done.
71 * @return A copy of the object.
74 virtual Format
* clone(void) const;
77 * Return true if the given Format objects are semantically equal. Objects
78 * of different subclasses are considered unequal.
79 * @param other the object to be compared with.
80 * @return true if the given Format objects are semantically equal.
83 virtual UBool
operator==(const Format
& other
) const;
86 using DateFormat::format
;
89 * Format a date or time, which is the standard millis since 24:00 GMT, Jan
90 * 1, 1970. Overrides DateFormat pure virtual method.
92 * Example: using the US locale: "yyyy.MM.dd e 'at' HH:mm:ss zzz" ->>
93 * 1996.07.10 AD at 15:08:56 PDT
95 * @param cal Calendar set to the date and time to be formatted
96 * into a date/time string.
97 * @param appendTo Output parameter to receive result.
98 * Result is appended to existing contents.
99 * @param pos The formatting position. On input: an alignment field,
100 * if desired. On output: the offsets of the alignment field.
101 * @return Reference to 'appendTo' parameter.
104 virtual UnicodeString
& format( Calendar
& cal
,
105 UnicodeString
& appendTo
,
106 FieldPosition
& pos
) const;
109 * Format an object to produce a string. This method handles Formattable
110 * objects with a UDate type. If a the Formattable object type is not a Date,
111 * then it returns a failing UErrorCode.
113 * @param obj The object to format. Must be a Date.
114 * @param appendTo Output parameter to receive result.
115 * Result is appended to existing contents.
116 * @param pos On input: an alignment field, if desired.
117 * On output: the offsets of the alignment field.
118 * @param status Output param filled with success/failure status.
119 * @return Reference to 'appendTo' parameter.
122 virtual UnicodeString
& format(const Formattable
& obj
,
123 UnicodeString
& appendTo
,
125 UErrorCode
& status
) const;
129 * Parse a date/time string beginning at the given parse position. For
130 * example, a time text "07/10/96 4:5 PM, PDT" will be parsed into a Date
131 * that is equivalent to Date(837039928046).
133 * By default, parsing is lenient: If the input is not in the form used by
134 * this object's format method but can still be parsed as a date, then the
135 * parse succeeds. Clients may insist on strict adherence to the format by
136 * calling setLenient(false).
138 * @param text The date/time string to be parsed
139 * @param cal a Calendar set to the date and time to be formatted
140 * into a date/time string.
141 * @param pos On input, the position at which to start parsing; on
142 * output, the position at which parsing terminated, or the
143 * start position if the parse failed.
144 * @return A valid UDate if the input could be parsed.
147 virtual void parse( const UnicodeString
& text
,
149 ParsePosition
& pos
) const;
152 * Parse a date/time string starting at the given parse position. For
153 * example, a time text "07/10/96 4:5 PM, PDT" will be parsed into a Date
154 * that is equivalent to Date(837039928046).
156 * By default, parsing is lenient: If the input is not in the form used by
157 * this object's format method but can still be parsed as a date, then the
158 * parse succeeds. Clients may insist on strict adherence to the format by
159 * calling setLenient(false).
161 * @see DateFormat::setLenient(boolean)
163 * @param text The date/time string to be parsed
164 * @param pos On input, the position at which to start parsing; on
165 * output, the position at which parsing terminated, or the
166 * start position if the parse failed.
167 * @return A valid UDate if the input could be parsed.
170 UDate
parse( const UnicodeString
& text
,
171 ParsePosition
& pos
) const;
175 * Parse a date/time string. For example, a time text "07/10/96 4:5 PM, PDT"
176 * will be parsed into a UDate that is equivalent to Date(837039928046).
177 * Parsing begins at the beginning of the string and proceeds as far as
178 * possible. Assuming no parse errors were encountered, this function
179 * doesn't return any information about how much of the string was consumed
180 * by the parsing. If you need that information, use the version of
181 * parse() that takes a ParsePosition.
183 * @param text The date/time string to be parsed
184 * @param status Filled in with U_ZERO_ERROR if the parse was successful, and with
185 * an error value if there was a parse error.
186 * @return A valid UDate if the input could be parsed.
189 virtual UDate
parse( const UnicodeString
& text
,
190 UErrorCode
& status
) const;
193 * Return a single pattern string generated by combining the patterns for the
194 * date and time formatters associated with this object.
195 * @param result Output param to receive the pattern.
196 * @return A reference to 'result'.
197 * @internal ICU 4.2 technology preview
199 virtual UnicodeString
& toPattern(UnicodeString
& result
, UErrorCode
& status
) const;
202 * Get the date pattern for the the date formatter associated with this object.
203 * @param result Output param to receive the date pattern.
204 * @return A reference to 'result'.
205 * @internal ICU 4.2 technology preview
207 virtual UnicodeString
& toPatternDate(UnicodeString
& result
, UErrorCode
& status
) const;
210 * Get the time pattern for the the time formatter associated with this object.
211 * @param result Output param to receive the time pattern.
212 * @return A reference to 'result'.
213 * @internal ICU 4.2 technology preview
215 virtual UnicodeString
& toPatternTime(UnicodeString
& result
, UErrorCode
& status
) const;
218 * Apply the given unlocalized date & time pattern strings to this relative date format.
219 * (i.e., after this call, this formatter will format dates and times according to
222 * @param datePattern The date pattern to be applied.
223 * @param timePattern The time pattern to be applied.
224 * @internal ICU 4.2 technology preview
226 virtual void applyPatterns(const UnicodeString
& datePattern
, const UnicodeString
& timePattern
, UErrorCode
&status
);
229 * Gets the date/time formatting symbols (this is an object carrying
230 * the various strings and other symbols used in formatting: e.g., month
231 * names and abbreviations, time zone names, AM/PM strings, etc.)
232 * @return a copy of the date-time formatting data associated
233 * with this date-time formatter.
236 virtual const DateFormatSymbols
* getDateFormatSymbols(void) const;
238 /* Cannot use #ifndef U_HIDE_DRAFT_API for the following draft method since it is virtual */
240 * Set a particular UDisplayContext value in the formatter, such as
241 * UDISPCTX_CAPITALIZATION_FOR_STANDALONE. Note: For getContext, see
243 * @param value The UDisplayContext value to set.
244 * @param status Input/output status. If at entry this indicates a failure
245 * status, the function will do nothing; otherwise this will be
246 * updated with any new status from the function.
249 virtual void setContext(UDisplayContext value
, UErrorCode
& status
);
252 SimpleDateFormat
*fDateTimeFormatter
;
253 UnicodeString fDatePattern
;
254 UnicodeString fTimePattern
;
255 SimpleFormatter
*fCombinedFormat
; // the {0} {1} format.
257 UDateFormatStyle fDateStyle
;
260 int32_t fDatesLen
; // Length of array
261 URelativeString
*fDates
; // array of strings
263 UBool fCombinedHasDateAtStart
;
264 UBool fCapitalizationInfoSet
;
265 UBool fCapitalizationOfRelativeUnitsForUIListMenu
;
266 UBool fCapitalizationOfRelativeUnitsForStandAlone
;
267 #if !UCONFIG_NO_BREAK_ITERATION
268 BreakIterator
* fCapitalizationBrkIter
;
270 UObject
* fCapitalizationBrkIter
;
274 * Get the string at a specific offset.
275 * @param day day offset ( -1, 0, 1, etc.. )
276 * @param len on output, length of string.
277 * @return the string, or NULL if none at that location.
279 const UChar
*getStringForDay(int32_t day
, int32_t &len
, UErrorCode
&status
) const;
282 * Load the Date string array
284 void loadDates(UErrorCode
&status
);
287 * Set fCapitalizationOfRelativeUnitsForUIListMenu, fCapitalizationOfRelativeUnitsForStandAlone
289 void initCapitalizationContextInfo(const Locale
& thelocale
);
292 * @return the number of days in "until-now"
294 static int32_t dayDifference(Calendar
&until
, UErrorCode
&status
);
297 * initializes fCalendar from parameters. Returns fCalendar as a convenience.
298 * @param adoptZone Zone to be adopted, or NULL for TimeZone::createDefault().
299 * @param locale Locale of the calendar
300 * @param status Error code
301 * @return the newly constructed fCalendar
304 Calendar
* initializeCalendar(TimeZone
* adoptZone
, const Locale
& locale
, UErrorCode
& status
);
308 * Return the class ID for this class. This is useful only for comparing to
309 * a return value from getDynamicClassID(). For example:
311 * . Base* polymorphic_pointer = createPolymorphicObject();
312 * . if (polymorphic_pointer->getDynamicClassID() ==
313 * . erived::getStaticClassID()) ...
315 * @return The class ID for all objects of this class.
318 U_I18N_API
static UClassID U_EXPORT2
getStaticClassID(void);
321 * Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This
322 * method is to implement a simple version of RTTI, since not all C++
323 * compilers support genuine RTTI. Polymorphic operator==() and clone()
324 * methods call this method.
326 * @return The class ID for this object. All objects of a
327 * given class have the same class ID. Objects of
328 * other classes have different class IDs.
331 virtual UClassID
getDynamicClassID(void) const;
335 * This is for ICU internal use only. Please do not use.
336 * Get the capitalization break iterator of this relative date formatter.
337 * Should be cloned before using it.
338 * It is used in udat.
340 * @return capitalization break iterator
343 BreakIterator
* getCapitalizationBrkIter(void) const;
346 inline BreakIterator
*
347 RelativeDateFormat::getCapitalizationBrkIter() const
349 return fCapitalizationBrkIter
;
354 #endif /* #if !UCONFIG_NO_FORMATTING */