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haiku/headers/libs/icu/unicode/datefmt.h
Oliver Tappe 75f1522155 * reintegrated gsoc-locale-kit branch into trunk - there's more 
work to do, but it's about time to give this code more exposure.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33176 a95241bf-73f2-0310-859d-f6bbb57e9c96
2009-09-18 22:23:34 +00:00

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/*
********************************************************************************
* Copyright (C) 1997-2009, International Business Machines
* Corporation and others. All Rights Reserved.
********************************************************************************
*
* File DATEFMT.H
*
* Modification History:
*
* Date Name Description
* 02/19/97 aliu Converted from java.
* 04/01/97 aliu Added support for centuries.
* 07/23/98 stephen JDK 1.2 sync
* 11/15/99 weiv Added support for week of year/day of week formatting
********************************************************************************
*/
#ifndef DATEFMT_H
#define DATEFMT_H
#include "unicode/utypes.h"
#if !UCONFIG_NO_FORMATTING
#include "unicode/udat.h"
#include "unicode/calendar.h"
#include "unicode/numfmt.h"
#include "unicode/format.h"
#include "unicode/locid.h"
/**
* \file
* \brief C++ API: Abstract class for converting dates.
*/
U_NAMESPACE_BEGIN
class TimeZone;
class DateTimePatternGenerator;
/**
* DateFormat is an abstract class for a family of classes that convert dates and
* times from their internal representations to textual form and back again in a
* language-independent manner. Converting from the internal representation (milliseconds
* since midnight, January 1, 1970) to text is known as "formatting," and converting
* from text to millis is known as "parsing." We currently define only one concrete
* subclass of DateFormat: SimpleDateFormat, which can handle pretty much all normal
* date formatting and parsing actions.
* <P>
* DateFormat helps you to format and parse dates for any locale. Your code can
* be completely independent of the locale conventions for months, days of the
* week, or even the calendar format: lunar vs. solar.
* <P>
* To format a date for the current Locale, use one of the static factory
* methods:
* <pre>
* \code
* DateFormat* dfmt = DateFormat::createDateInstance();
* UDate myDate = Calendar::getNow();
* UnicodeString myString;
* myString = dfmt->format( myDate, myString );
* \endcode
* </pre>
* If you are formatting multiple numbers, it is more efficient to get the
* format and use it multiple times so that the system doesn't have to fetch the
* information about the local language and country conventions multiple times.
* <pre>
* \code
* DateFormat* df = DateFormat::createDateInstance();
* UnicodeString myString;
* UDate myDateArr[] = { 0.0, 100000000.0, 2000000000.0 }; // test values
* for (int32_t i = 0; i < 3; ++i) {
* myString.remove();
* cout << df->format( myDateArr[i], myString ) << endl;
* }
* \endcode
* </pre>
* To get specific fields of a date, you can use UFieldPosition to
* get specific fields.
* <pre>
* \code
* DateFormat* dfmt = DateFormat::createDateInstance();
* FieldPosition pos(DateFormat::YEAR_FIELD);
* UnicodeString myString;
* myString = dfmt->format( myDate, myString );
* cout << myString << endl;
* cout << pos.getBeginIndex() << "," << pos. getEndIndex() << endl;
* \endcode
* </pre>
* To format a date for a different Locale, specify it in the call to
* createDateInstance().
* <pre>
* \code
* DateFormat* df =
* DateFormat::createDateInstance( DateFormat::SHORT, Locale::getFrance());
* \endcode
* </pre>
* You can use a DateFormat to parse also.
* <pre>
* \code
* UErrorCode status = U_ZERO_ERROR;
* UDate myDate = df->parse(myString, status);
* \endcode
* </pre>
* Use createDateInstance() to produce the normal date format for that country.
* There are other static factory methods available. Use createTimeInstance()
* to produce the normal time format for that country. Use createDateTimeInstance()
* to produce a DateFormat that formats both date and time. You can pass in
* different options to these factory methods to control the length of the
* result; from SHORT to MEDIUM to LONG to FULL. The exact result depends on the
* locale, but generally:
* <ul type=round>
* <li> SHORT is completely numeric, such as 12/13/52 or 3:30pm
* <li> MEDIUM is longer, such as Jan 12, 1952
* <li> LONG is longer, such as January 12, 1952 or 3:30:32pm
* <li> FULL is pretty completely specified, such as
* Tuesday, April 12, 1952 AD or 3:30:42pm PST.
* </ul>
* You can also set the time zone on the format if you wish. If you want even
* more control over the format or parsing, (or want to give your users more
* control), you can try casting the DateFormat you get from the factory methods
* to a SimpleDateFormat. This will work for the majority of countries; just
* remember to chck getDynamicClassID() before carrying out the cast.
* <P>
* You can also use forms of the parse and format methods with ParsePosition and
* FieldPosition to allow you to
* <ul type=round>
* <li> Progressively parse through pieces of a string.
* <li> Align any particular field, or find out where it is for selection
* on the screen.
* </ul>
*
* <p><em>User subclasses are not supported.</em> While clients may write
* subclasses, such code will not necessarily work and will not be
* guaranteed to work stably from release to release.
*/
class U_I18N_API DateFormat : public Format {
public:
/**
* Constants for various style patterns. These reflect the order of items in
* the DateTimePatterns resource. There are 4 time patterns, 4 date patterns,
* the default date-time pattern, and 4 date-time patterns. Each block of 4 values
* in the resource occurs in the order full, long, medium, short.
* @stable ICU 2.4
*/
enum EStyle
{
kNone = -1,
kFull = 0,
kLong = 1,
kMedium = 2,
kShort = 3,
kDateOffset = kShort + 1,
// kFull + kDateOffset = 4
// kLong + kDateOffset = 5
// kMedium + kDateOffset = 6
// kShort + kDateOffset = 7
kDateTime = 8,
// Default DateTime
kDateTimeOffset = kDateTime + 1,
// kFull + kDateTimeOffset = 9
// kLong + kDateTimeOffset = 10
// kMedium + kDateTimeOffset = 11
// kShort + kDateTimeOffset = 12
// relative dates
kRelative = (1 << 7),
kFullRelative = (kFull | kRelative),
kLongRelative = kLong | kRelative,
kMediumRelative = kMedium | kRelative,
kShortRelative = kShort | kRelative,
kDefault = kMedium,
/**
* These constants are provided for backwards compatibility only.
* Please use the C++ style constants defined above.
*/
FULL = kFull,
LONG = kLong,
MEDIUM = kMedium,
SHORT = kShort,
DEFAULT = kDefault,
DATE_OFFSET = kDateOffset,
NONE = kNone,
DATE_TIME = kDateTime
};
/**
* Destructor.
* @stable ICU 2.0
*/
virtual ~DateFormat();
/**
* Equality operator. Returns true if the two formats have the same behavior.
* @stable ICU 2.0
*/
virtual UBool operator==(const Format&) const;
/**
* Format an object to produce a string. This method handles Formattable
* objects with a UDate type. If a the Formattable object type is not a Date,
* then it returns a failing UErrorCode.
*
* @param obj The object to format. Must be a Date.
* @param appendTo Output parameter to receive result.
* Result is appended to existing contents.
* @param pos On input: an alignment field, if desired.
* On output: the offsets of the alignment field.
* @param status Output param filled with success/failure status.
* @return Reference to 'appendTo' parameter.
* @stable ICU 2.0
*/
virtual UnicodeString& format(const Formattable& obj,
UnicodeString& appendTo,
FieldPosition& pos,
UErrorCode& status) const;
/**
* Formats a date into a date/time string. This is an abstract method which
* concrete subclasses must implement.
* <P>
* On input, the FieldPosition parameter may have its "field" member filled with
* an enum value specifying a field. On output, the FieldPosition will be filled
* in with the text offsets for that field.
* <P> For example, given a time text
* "1996.07.10 AD at 15:08:56 PDT", if the given fieldPosition.field is
* UDAT_YEAR_FIELD, the offsets fieldPosition.beginIndex and
* statfieldPositionus.getEndIndex will be set to 0 and 4, respectively.
* <P> Notice
* that if the same time field appears more than once in a pattern, the status will
* be set for the first occurence of that time field. For instance,
* formatting a UDate to the time string "1 PM PDT (Pacific Daylight Time)"
* using the pattern "h a z (zzzz)" and the alignment field
* DateFormat::TIMEZONE_FIELD, the offsets fieldPosition.beginIndex and
* fieldPosition.getEndIndex will be set to 5 and 8, respectively, for the first
* occurence of the timezone pattern character 'z'.
*
* @param cal Calendar set to the date and time to be formatted
* into a date/time string. When the calendar type is
* different from the internal calendar held by this
* DateFormat instance, the date and the time zone will
* be inherited from the input calendar, but other calendar
* field values will be calculated by the internal calendar.
* @param appendTo Output parameter to receive result.
* Result is appended to existing contents.
* @param fieldPosition On input: an alignment field, if desired (see examples above)
* On output: the offsets of the alignment field (see examples above)
* @return Reference to 'appendTo' parameter.
* @stable ICU 2.1
*/
virtual UnicodeString& format( Calendar& cal,
UnicodeString& appendTo,
FieldPosition& fieldPosition) const = 0;
/**
* Formats a UDate into a date/time string.
* <P>
* On input, the FieldPosition parameter may have its "field" member filled with
* an enum value specifying a field. On output, the FieldPosition will be filled
* in with the text offsets for that field.
* <P> For example, given a time text
* "1996.07.10 AD at 15:08:56 PDT", if the given fieldPosition.field is
* UDAT_YEAR_FIELD, the offsets fieldPosition.beginIndex and
* statfieldPositionus.getEndIndex will be set to 0 and 4, respectively.
* <P> Notice
* that if the same time field appears more than once in a pattern, the status will
* be set for the first occurence of that time field. For instance,
* formatting a UDate to the time string "1 PM PDT (Pacific Daylight Time)"
* using the pattern "h a z (zzzz)" and the alignment field
* DateFormat::TIMEZONE_FIELD, the offsets fieldPosition.beginIndex and
* fieldPosition.getEndIndex will be set to 5 and 8, respectively, for the first
* occurence of the timezone pattern character 'z'.
*
* @param date UDate to be formatted into a date/time string.
* @param appendTo Output parameter to receive result.
* Result is appended to existing contents.
* @param fieldPosition On input: an alignment field, if desired (see examples above)
* On output: the offsets of the alignment field (see examples above)
* @return Reference to 'appendTo' parameter.
* @stable ICU 2.0
*/
UnicodeString& format( UDate date,
UnicodeString& appendTo,
FieldPosition& fieldPosition) const;
/**
* Formats a UDate into a date/time string. If there is a problem, you won't
* know, using this method. Use the overloaded format() method which takes a
* FieldPosition& to detect formatting problems.
*
* @param date The UDate value to be formatted into a string.
* @param appendTo Output parameter to receive result.
* Result is appended to existing contents.
* @return Reference to 'appendTo' parameter.
* @stable ICU 2.0
*/
UnicodeString& format(UDate date, UnicodeString& appendTo) const;
/**
* Redeclared Format method.
*
* @param obj The object to be formatted into a string.
* @param appendTo Output parameter to receive result.
* Result is appended to existing contents.
* @param status Output param filled with success/failure status.
* @return Reference to 'appendTo' parameter.
* @stable ICU 2.0
*/
UnicodeString& format(const Formattable& obj,
UnicodeString& appendTo,
UErrorCode& status) const;
/**
* Parse a date/time string.
*
* @param text The string to be parsed into a UDate value.
* @param status Output param to be set to success/failure code. If
* 'text' cannot be parsed, it will be set to a failure
* code.
* @result The parsed UDate value, if successful.
* @stable ICU 2.0
*/
virtual UDate parse( const UnicodeString& text,
UErrorCode& status) const;
/**
* Parse a date/time string beginning at the given parse position. For
* example, a time text "07/10/96 4:5 PM, PDT" will be parsed into a Date
* that is equivalent to Date(837039928046).
* <P>
* By default, parsing is lenient: If the input is not in the form used by
* this object's format method but can still be parsed as a date, then the
* parse succeeds. Clients may insist on strict adherence to the format by
* calling setLenient(false).
*
* @see DateFormat::setLenient(boolean)
*
* @param text The date/time string to be parsed
* @param cal a Calendar set to the date and time to be formatted
* into a date/time string. When the calendar type
* is different from the internal calendar held by this
* DateFormat instance, calendar field values will be
* parsed based on the internal calendar, then the result
* (time in milliseconds and time zone) will be set in
* this calendar.
* @param pos On input, the position at which to start parsing; on
* output, the position at which parsing terminated, or the
* start position if the parse failed.
* @return A valid UDate if the input could be parsed.
* @stable ICU 2.1
*/
virtual void parse( const UnicodeString& text,
Calendar& cal,
ParsePosition& pos) const = 0;
/**
* Parse a date/time string beginning at the given parse position. For
* example, a time text "07/10/96 4:5 PM, PDT" will be parsed into a Date
* that is equivalent to Date(837039928046).
* <P>
* By default, parsing is lenient: If the input is not in the form used by
* this object's format method but can still be parsed as a date, then the
* parse succeeds. Clients may insist on strict adherence to the format by
* calling setLenient(false).
*
* @see DateFormat::setLenient(boolean)
*
* @param text The date/time string to be parsed
* @param pos On input, the position at which to start parsing; on
* output, the position at which parsing terminated, or the
* start position if the parse failed.
* @return A valid UDate if the input could be parsed.
* @stable ICU 2.0
*/
UDate parse( const UnicodeString& text,
ParsePosition& pos) const;
/**
* Parse a string to produce an object. This methods handles parsing of
* date/time strings into Formattable objects with UDate types.
* <P>
* Before calling, set parse_pos.index to the offset you want to start
* parsing at in the source. After calling, parse_pos.index is the end of
* the text you parsed. If error occurs, index is unchanged.
* <P>
* When parsing, leading whitespace is discarded (with a successful parse),
* while trailing whitespace is left as is.
* <P>
* See Format::parseObject() for more.
*
* @param source The string to be parsed into an object.
* @param result Formattable to be set to the parse result.
* If parse fails, return contents are undefined.
* @param parse_pos The position to start parsing at. Upon return
* this param is set to the position after the
* last character successfully parsed. If the
* source is not parsed successfully, this param
* will remain unchanged.
* @return A newly created Formattable* object, or NULL
* on failure. The caller owns this and should
* delete it when done.
* @stable ICU 2.0
*/
virtual void parseObject(const UnicodeString& source,
Formattable& result,
ParsePosition& parse_pos) const;
/**
* Create a default date/time formatter that uses the SHORT style for both
* the date and the time.
*
* @return A date/time formatter which the caller owns.
* @stable ICU 2.0
*/
static DateFormat* U_EXPORT2 createInstance(void);
/**
* Creates a time formatter with the given formatting style for the given
* locale.
*
* @param style The given formatting style. For example,
* SHORT for "h:mm a" in the US locale. Relative
* time styles are not currently supported.
* @param aLocale The given locale.
* @return A time formatter which the caller owns.
* @stable ICU 2.0
*/
static DateFormat* U_EXPORT2 createTimeInstance(EStyle style = kDefault,
const Locale& aLocale = Locale::getDefault());
/**
* Creates a date formatter with the given formatting style for the given
* const locale.
*
* @param style The given formatting style. For example,
* SHORT for "M/d/yy" in the US locale.
* @param aLocale The given locale.
* @return A date formatter which the caller owns.
* @stable ICU 2.0
*/
static DateFormat* U_EXPORT2 createDateInstance(EStyle style = kDefault,
const Locale& aLocale = Locale::getDefault());
/**
* Creates a date/time formatter with the given formatting styles for the
* given locale.
*
* @param dateStyle The given formatting style for the date portion of the result.
* For example, SHORT for "M/d/yy" in the US locale.
* @param timeStyle The given formatting style for the time portion of the result.
* For example, SHORT for "h:mm a" in the US locale. Relative
* time styles are not currently supported.
* @param aLocale The given locale.
* @return A date/time formatter which the caller owns.
* @stable ICU 2.0
*/
static DateFormat* U_EXPORT2 createDateTimeInstance(EStyle dateStyle = kDefault,
EStyle timeStyle = kDefault,
const Locale& aLocale = Locale::getDefault());
/**
* Gets the set of locales for which DateFormats are installed.
* @param count Filled in with the number of locales in the list that is returned.
* @return the set of locales for which DateFormats are installed. The caller
* does NOT own this list and must not delete it.
* @stable ICU 2.0
*/
static const Locale* U_EXPORT2 getAvailableLocales(int32_t& count);
/**
* Returns true if the formatter is set for lenient parsing.
* @stable ICU 2.0
*/
virtual UBool isLenient(void) const;
/**
* Specify whether or not date/time parsing is to be lenient. With lenient
* parsing, the parser may use heuristics to interpret inputs that do not
* precisely match this object's format. With strict parsing, inputs must
* match this object's format.
*
* @param lenient True specifies date/time interpretation to be lenient.
* @see Calendar::setLenient
* @stable ICU 2.0
*/
virtual void setLenient(UBool lenient);
/**
* Gets the calendar associated with this date/time formatter.
* @return the calendar associated with this date/time formatter.
* @stable ICU 2.0
*/
virtual const Calendar* getCalendar(void) const;
/**
* Set the calendar to be used by this date format. Initially, the default
* calendar for the specified or default locale is used. The caller should
* not delete the Calendar object after it is adopted by this call.
* Adopting a new calendar will change to the default symbols.
*
* @param calendarToAdopt Calendar object to be adopted.
* @stable ICU 2.0
*/
virtual void adoptCalendar(Calendar* calendarToAdopt);
/**
* Set the calendar to be used by this date format. Initially, the default
* calendar for the specified or default locale is used.
*
* @param newCalendar Calendar object to be set.
* @stable ICU 2.0
*/
virtual void setCalendar(const Calendar& newCalendar);
/**
* Gets the number formatter which this date/time formatter uses to format
* and parse the numeric portions of the pattern.
* @return the number formatter which this date/time formatter uses.
* @stable ICU 2.0
*/
virtual const NumberFormat* getNumberFormat(void) const;
/**
* Allows you to set the number formatter. The caller should
* not delete the NumberFormat object after it is adopted by this call.
* @param formatToAdopt NumberFormat object to be adopted.
* @stable ICU 2.0
*/
virtual void adoptNumberFormat(NumberFormat* formatToAdopt);
/**
* Allows you to set the number formatter.
* @param newNumberFormat NumberFormat object to be set.
* @stable ICU 2.0
*/
virtual void setNumberFormat(const NumberFormat& newNumberFormat);
/**
* Returns a reference to the TimeZone used by this DateFormat's calendar.
* @return the time zone associated with the calendar of DateFormat.
* @stable ICU 2.0
*/
virtual const TimeZone& getTimeZone(void) const;
/**
* Sets the time zone for the calendar of this DateFormat object. The caller
* no longer owns the TimeZone object and should not delete it after this call.
* @param zoneToAdopt the TimeZone to be adopted.
* @stable ICU 2.0
*/
virtual void adoptTimeZone(TimeZone* zoneToAdopt);
/**
* Sets the time zone for the calendar of this DateFormat object.
* @param zone the new time zone.
* @stable ICU 2.0
*/
virtual void setTimeZone(const TimeZone& zone);
protected:
/**
* Default constructor. Creates a DateFormat with no Calendar or NumberFormat
* associated with it. This constructor depends on the subclasses to fill in
* the calendar and numberFormat fields.
* @stable ICU 2.0
*/
DateFormat();
/**
* Copy constructor.
* @stable ICU 2.0
*/
DateFormat(const DateFormat&);
/**
* Default assignment operator.
* @stable ICU 2.0
*/
DateFormat& operator=(const DateFormat&);
/**
* The calendar that DateFormat uses to produce the time field values needed
* to implement date/time formatting. Subclasses should generally initialize
* this to the default calendar for the locale associated with this DateFormat.
* @stable ICU 2.4
*/
Calendar* fCalendar;
/**
* The number formatter that DateFormat uses to format numbers in dates and
* times. Subclasses should generally initialize this to the default number
* format for the locale associated with this DateFormat.
* @stable ICU 2.4
*/
NumberFormat* fNumberFormat;
private:
/**
* Gets the date/time formatter with the given formatting styles for the
* given locale.
* @param dateStyle the given date formatting style.
* @param timeStyle the given time formatting style.
* @param inLocale the given locale.
* @return a date/time formatter, or 0 on failure.
*/
static DateFormat* U_EXPORT2 create(EStyle timeStyle, EStyle dateStyle, const Locale&);
public:
/**
* Field selector for FieldPosition for DateFormat fields.
* @obsolete ICU 3.4 use UDateFormatField instead, since this API will be
* removed in that release
*/
enum EField
{
// Obsolete; use UDateFormatField instead
kEraField = UDAT_ERA_FIELD,
kYearField = UDAT_YEAR_FIELD,
kMonthField = UDAT_MONTH_FIELD,
kDateField = UDAT_DATE_FIELD,
kHourOfDay1Field = UDAT_HOUR_OF_DAY1_FIELD,
kHourOfDay0Field = UDAT_HOUR_OF_DAY0_FIELD,
kMinuteField = UDAT_MINUTE_FIELD,
kSecondField = UDAT_SECOND_FIELD,
kMillisecondField = UDAT_FRACTIONAL_SECOND_FIELD,
kDayOfWeekField = UDAT_DAY_OF_WEEK_FIELD,
kDayOfYearField = UDAT_DAY_OF_YEAR_FIELD,
kDayOfWeekInMonthField = UDAT_DAY_OF_WEEK_IN_MONTH_FIELD,
kWeekOfYearField = UDAT_WEEK_OF_YEAR_FIELD,
kWeekOfMonthField = UDAT_WEEK_OF_MONTH_FIELD,
kAmPmField = UDAT_AM_PM_FIELD,
kHour1Field = UDAT_HOUR1_FIELD,
kHour0Field = UDAT_HOUR0_FIELD,
kTimezoneField = UDAT_TIMEZONE_FIELD,
kYearWOYField = UDAT_YEAR_WOY_FIELD,
kDOWLocalField = UDAT_DOW_LOCAL_FIELD,
kExtendedYearField = UDAT_EXTENDED_YEAR_FIELD,
kJulianDayField = UDAT_JULIAN_DAY_FIELD,
kMillisecondsInDayField = UDAT_MILLISECONDS_IN_DAY_FIELD,
// Obsolete; use UDateFormatField instead
ERA_FIELD = UDAT_ERA_FIELD,
YEAR_FIELD = UDAT_YEAR_FIELD,
MONTH_FIELD = UDAT_MONTH_FIELD,
DATE_FIELD = UDAT_DATE_FIELD,
HOUR_OF_DAY1_FIELD = UDAT_HOUR_OF_DAY1_FIELD,
HOUR_OF_DAY0_FIELD = UDAT_HOUR_OF_DAY0_FIELD,
MINUTE_FIELD = UDAT_MINUTE_FIELD,
SECOND_FIELD = UDAT_SECOND_FIELD,
MILLISECOND_FIELD = UDAT_FRACTIONAL_SECOND_FIELD,
DAY_OF_WEEK_FIELD = UDAT_DAY_OF_WEEK_FIELD,
DAY_OF_YEAR_FIELD = UDAT_DAY_OF_YEAR_FIELD,
DAY_OF_WEEK_IN_MONTH_FIELD = UDAT_DAY_OF_WEEK_IN_MONTH_FIELD,
WEEK_OF_YEAR_FIELD = UDAT_WEEK_OF_YEAR_FIELD,
WEEK_OF_MONTH_FIELD = UDAT_WEEK_OF_MONTH_FIELD,
AM_PM_FIELD = UDAT_AM_PM_FIELD,
HOUR1_FIELD = UDAT_HOUR1_FIELD,
HOUR0_FIELD = UDAT_HOUR0_FIELD,
TIMEZONE_FIELD = UDAT_TIMEZONE_FIELD
};
};
inline UnicodeString&
DateFormat::format(const Formattable& obj,
UnicodeString& appendTo,
UErrorCode& status) const {
return Format::format(obj, appendTo, status);
}
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif // _DATEFMT
//eof
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