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      1 /*
      2  ********************************************************************************
      3  *   Copyright (C) 1997-2010, International Business Machines
      4  *   Corporation and others.  All Rights Reserved.
      5  ********************************************************************************
      6  *
      7  * File DATEFMT.H
      8  *
      9  * Modification History:
     10  *
     11  *   Date        Name        Description
     12  *   02/19/97    aliu        Converted from java.
     13  *   04/01/97    aliu        Added support for centuries.
     14  *   07/23/98    stephen     JDK 1.2 sync
     15  *   11/15/99    weiv        Added support for week of year/day of week formatting
     16  ********************************************************************************
     17  */
     18 
     19 #ifndef DATEFMT_H
     20 #define DATEFMT_H
     21 
     22 #include "unicode/utypes.h"
     23 
     24 #if !UCONFIG_NO_FORMATTING
     25 
     26 #include "unicode/udat.h"
     27 #include "unicode/calendar.h"
     28 #include "unicode/numfmt.h"
     29 #include "unicode/format.h"
     30 #include "unicode/locid.h"
     31 
     32 /**
     33  * \file
     34  * \brief C++ API: Abstract class for converting dates.
     35  */
     36 
     37 U_NAMESPACE_BEGIN
     38 
     39 class TimeZone;
     40 class DateTimePatternGenerator;
     41 
     42 /**
     43  * DateFormat is an abstract class for a family of classes that convert dates and
     44  * times from their internal representations to textual form and back again in a
     45  * language-independent manner. Converting from the internal representation (milliseconds
     46  * since midnight, January 1, 1970) to text is known as "formatting," and converting
     47  * from text to millis is known as "parsing."  We currently define only one concrete
     48  * subclass of DateFormat: SimpleDateFormat, which can handle pretty much all normal
     49  * date formatting and parsing actions.
     50  * <P>
     51  * DateFormat helps you to format and parse dates for any locale. Your code can
     52  * be completely independent of the locale conventions for months, days of the
     53  * week, or even the calendar format: lunar vs. solar.
     54  * <P>
     55  * To format a date for the current Locale, use one of the static factory
     56  * methods:
     57  * <pre>
     58  * \code
     59  *      DateFormat* dfmt = DateFormat::createDateInstance();
     60  *      UDate myDate = Calendar::getNow();
     61  *      UnicodeString myString;
     62  *      myString = dfmt->format( myDate, myString );
     63  * \endcode
     64  * </pre>
     65  * If you are formatting multiple numbers, it is more efficient to get the
     66  * format and use it multiple times so that the system doesn't have to fetch the
     67  * information about the local language and country conventions multiple times.
     68  * <pre>
     69  * \code
     70  *      DateFormat* df = DateFormat::createDateInstance();
     71  *      UnicodeString myString;
     72  *      UDate myDateArr[] = { 0.0, 100000000.0, 2000000000.0 }; // test values
     73  *      for (int32_t i = 0; i < 3; ++i) {
     74  *          myString.remove();
     75  *          cout << df->format( myDateArr[i], myString ) << endl;
     76  *      }
     77  * \endcode
     78  * </pre>
     79  * To get specific fields of a date, you can use UFieldPosition to
     80  * get specific fields.
     81  * <pre>
     82  * \code
     83  *      DateFormat* dfmt = DateFormat::createDateInstance();
     84  *      FieldPosition pos(DateFormat::YEAR_FIELD);
     85  *      UnicodeString myString;
     86  *      myString = dfmt->format( myDate, myString );
     87  *      cout << myString << endl;
     88  *      cout << pos.getBeginIndex() << "," << pos. getEndIndex() << endl;
     89  * \endcode
     90  * </pre>
     91  * To format a date for a different Locale, specify it in the call to
     92  * createDateInstance().
     93  * <pre>
     94  * \code
     95  *       DateFormat* df =
     96  *           DateFormat::createDateInstance( DateFormat::SHORT, Locale::getFrance());
     97  * \endcode
     98  * </pre>
     99  * You can use a DateFormat to parse also.
    100  * <pre>
    101  * \code
    102  *       UErrorCode status = U_ZERO_ERROR;
    103  *       UDate myDate = df->parse(myString, status);
    104  * \endcode
    105  * </pre>
    106  * Use createDateInstance() to produce the normal date format for that country.
    107  * There are other static factory methods available. Use createTimeInstance()
    108  * to produce the normal time format for that country. Use createDateTimeInstance()
    109  * to produce a DateFormat that formats both date and time. You can pass in
    110  * different options to these factory methods to control the length of the
    111  * result; from SHORT to MEDIUM to LONG to FULL. The exact result depends on the
    112  * locale, but generally:
    113  * <ul type=round>
    114  *   <li>   SHORT is completely numeric, such as 12/13/52 or 3:30pm
    115  *   <li>   MEDIUM is longer, such as Jan 12, 1952
    116  *   <li>   LONG is longer, such as January 12, 1952 or 3:30:32pm
    117  *   <li>   FULL is pretty completely specified, such as
    118  *          Tuesday, April 12, 1952 AD or 3:30:42pm PST.
    119  * </ul>
    120  * You can also set the time zone on the format if you wish. If you want even
    121  * more control over the format or parsing, (or want to give your users more
    122  * control), you can try casting the DateFormat you get from the factory methods
    123  * to a SimpleDateFormat. This will work for the majority of countries; just
    124  * remember to chck getDynamicClassID() before carrying out the cast.
    125  * <P>
    126  * You can also use forms of the parse and format methods with ParsePosition and
    127  * FieldPosition to allow you to
    128  * <ul type=round>
    129  *   <li>   Progressively parse through pieces of a string.
    130  *   <li>   Align any particular field, or find out where it is for selection
    131  *          on the screen.
    132  * </ul>
    133  *
    134  * <p><em>User subclasses are not supported.</em> While clients may write
    135  * subclasses, such code will not necessarily work and will not be
    136  * guaranteed to work stably from release to release.
    137  */
    138 class U_I18N_API DateFormat : public Format {
    139 public:
    140 
    141     /**
    142      * Constants for various style patterns. These reflect the order of items in
    143      * the DateTimePatterns resource. There are 4 time patterns, 4 date patterns,
    144      * the default date-time pattern, and 4 date-time patterns. Each block of 4 values
    145      * in the resource occurs in the order full, long, medium, short.
    146      * @stable ICU 2.4
    147      */
    148     enum EStyle
    149     {
    150         kNone   = -1,
    151 
    152         kFull   = 0,
    153         kLong   = 1,
    154         kMedium = 2,
    155         kShort  = 3,
    156 
    157         kDateOffset   = kShort + 1,
    158      // kFull   + kDateOffset = 4
    159      // kLong   + kDateOffset = 5
    160      // kMedium + kDateOffset = 6
    161      // kShort  + kDateOffset = 7
    162 
    163         kDateTime             = 8,
    164      // Default DateTime
    165 
    166         kDateTimeOffset = kDateTime + 1,
    167      // kFull   + kDateTimeOffset = 9
    168      // kLong   + kDateTimeOffset = 10
    169      // kMedium + kDateTimeOffset = 11
    170      // kShort  + kDateTimeOffset = 12
    171 
    172         // relative dates
    173         kRelative = (1 << 7),
    174 
    175         kFullRelative = (kFull | kRelative),
    176 
    177         kLongRelative = kLong | kRelative,
    178 
    179         kMediumRelative = kMedium | kRelative,
    180 
    181         kShortRelative = kShort | kRelative,
    182 
    183 
    184         kDefault      = kMedium,
    185 
    186 
    187 
    188     /**
    189      * These constants are provided for backwards compatibility only.
    190      * Please use the C++ style constants defined above.
    191      */
    192         FULL        = kFull,
    193         LONG        = kLong,
    194         MEDIUM        = kMedium,
    195         SHORT        = kShort,
    196         DEFAULT        = kDefault,
    197         DATE_OFFSET    = kDateOffset,
    198         NONE        = kNone,
    199         DATE_TIME    = kDateTime
    200     };
    201 
    202     /**
    203      * Destructor.
    204      * @stable ICU 2.0
    205      */
    206     virtual ~DateFormat();
    207 
    208     /**
    209      * Equality operator.  Returns true if the two formats have the same behavior.
    210      * @stable ICU 2.0
    211      */
    212     virtual UBool operator==(const Format&) const;
    213 
    214 
    215     using Format::format;
    216 
    217     /**
    218      * Format an object to produce a string. This method handles Formattable
    219      * objects with a UDate type. If a the Formattable object type is not a Date,
    220      * then it returns a failing UErrorCode.
    221      *
    222      * @param obj       The object to format. Must be a Date.
    223      * @param appendTo  Output parameter to receive result.
    224      *                  Result is appended to existing contents.
    225      * @param pos       On input: an alignment field, if desired.
    226      *                  On output: the offsets of the alignment field.
    227      * @param status    Output param filled with success/failure status.
    228      * @return          Reference to 'appendTo' parameter.
    229      * @stable ICU 2.0
    230      */
    231     virtual UnicodeString& format(const Formattable& obj,
    232                                   UnicodeString& appendTo,
    233                                   FieldPosition& pos,
    234                                   UErrorCode& status) const;
    235 
    236     /**
    237      * Format an object to produce a string. This method handles Formattable
    238      * objects with a UDate type. If a the Formattable object type is not a Date,
    239      * then it returns a failing UErrorCode.
    240      *
    241      * @param obj       The object to format. Must be a Date.
    242      * @param appendTo  Output parameter to receive result.
    243      *                  Result is appended to existing contents.
    244      * @param posIter   On return, can be used to iterate over positions
    245      *                  of fields generated by this format call.  Field values
    246      *                  are defined in UDateFormatField.  Can be NULL.
    247      * @param status    Output param filled with success/failure status.
    248      * @return          Reference to 'appendTo' parameter.
    249      * @stable ICU 4.4
    250      */
    251     virtual UnicodeString& format(const Formattable& obj,
    252                                   UnicodeString& appendTo,
    253                                   FieldPositionIterator* posIter,
    254                                   UErrorCode& status) const;
    255     /**
    256      * Formats a date into a date/time string. This is an abstract method which
    257      * concrete subclasses must implement.
    258      * <P>
    259      * On input, the FieldPosition parameter may have its "field" member filled with
    260      * an enum value specifying a field.  On output, the FieldPosition will be filled
    261      * in with the text offsets for that field.
    262      * <P> For example, given a time text
    263      * "1996.07.10 AD at 15:08:56 PDT", if the given fieldPosition.field is
    264      * UDAT_YEAR_FIELD, the offsets fieldPosition.beginIndex and
    265      * statfieldPositionus.getEndIndex will be set to 0 and 4, respectively.
    266      * <P> Notice
    267      * that if the same time field appears more than once in a pattern, the status will
    268      * be set for the first occurence of that time field. For instance,
    269      * formatting a UDate to the time string "1 PM PDT (Pacific Daylight Time)"
    270      * using the pattern "h a z (zzzz)" and the alignment field
    271      * DateFormat::TIMEZONE_FIELD, the offsets fieldPosition.beginIndex and
    272      * fieldPosition.getEndIndex will be set to 5 and 8, respectively, for the first
    273      * occurence of the timezone pattern character 'z'.
    274      *
    275      * @param cal           Calendar set to the date and time to be formatted
    276      *                      into a date/time string.  When the calendar type is
    277      *                      different from the internal calendar held by this
    278      *                      DateFormat instance, the date and the time zone will
    279      *                      be inherited from the input calendar, but other calendar
    280      *                      field values will be calculated by the internal calendar.
    281      * @param appendTo      Output parameter to receive result.
    282      *                      Result is appended to existing contents.
    283      * @param fieldPosition On input: an alignment field, if desired (see examples above)
    284      *                      On output: the offsets of the alignment field (see examples above)
    285      * @return              Reference to 'appendTo' parameter.
    286      * @stable ICU 2.1
    287      */
    288     virtual UnicodeString& format(  Calendar& cal,
    289                                     UnicodeString& appendTo,
    290                                     FieldPosition& fieldPosition) const = 0;
    291 
    292     /**
    293      * Formats a date into a date/time string. Subclasses should implement this method.
    294      *
    295      * @param cal       Calendar set to the date and time to be formatted
    296      *                  into a date/time string.  When the calendar type is
    297      *                  different from the internal calendar held by this
    298      *                  DateFormat instance, the date and the time zone will
    299      *                  be inherited from the input calendar, but other calendar
    300      *                  field values will be calculated by the internal calendar.
    301      * @param appendTo  Output parameter to receive result.
    302      *                  Result is appended to existing contents.
    303      * @param posIter   On return, can be used to iterate over positions
    304      *                  of fields generated by this format call.  Field values
    305      *                  are defined in UDateFormatField.  Can be NULL.
    306      * @param status    error status.
    307      * @return          Reference to 'appendTo' parameter.
    308      * @stable ICU 4.4
    309      */
    310     virtual UnicodeString& format(Calendar& cal,
    311                                   UnicodeString& appendTo,
    312                                   FieldPositionIterator* posIter,
    313                                   UErrorCode& status) const;
    314     /**
    315      * Formats a UDate into a date/time string.
    316      * <P>
    317      * On input, the FieldPosition parameter may have its "field" member filled with
    318      * an enum value specifying a field.  On output, the FieldPosition will be filled
    319      * in with the text offsets for that field.
    320      * <P> For example, given a time text
    321      * "1996.07.10 AD at 15:08:56 PDT", if the given fieldPosition.field is
    322      * UDAT_YEAR_FIELD, the offsets fieldPosition.beginIndex and
    323      * statfieldPositionus.getEndIndex will be set to 0 and 4, respectively.
    324      * <P> Notice
    325      * that if the same time field appears more than once in a pattern, the status will
    326      * be set for the first occurence of that time field. For instance,
    327      * formatting a UDate to the time string "1 PM PDT (Pacific Daylight Time)"
    328      * using the pattern "h a z (zzzz)" and the alignment field
    329      * DateFormat::TIMEZONE_FIELD, the offsets fieldPosition.beginIndex and
    330      * fieldPosition.getEndIndex will be set to 5 and 8, respectively, for the first
    331      * occurence of the timezone pattern character 'z'.
    332      *
    333      * @param date          UDate to be formatted into a date/time string.
    334      * @param appendTo      Output parameter to receive result.
    335      *                      Result is appended to existing contents.
    336      * @param fieldPosition On input: an alignment field, if desired (see examples above)
    337      *                      On output: the offsets of the alignment field (see examples above)
    338      * @return              Reference to 'appendTo' parameter.
    339      * @stable ICU 2.0
    340      */
    341     UnicodeString& format(  UDate date,
    342                             UnicodeString& appendTo,
    343                             FieldPosition& fieldPosition) const;
    344 
    345     /**
    346      * Formats a UDate into a date/time string.
    347      *
    348      * @param date      UDate to be formatted into a date/time string.
    349      * @param appendTo  Output parameter to receive result.
    350      *                  Result is appended to existing contents.
    351      * @param posIter   On return, can be used to iterate over positions
    352      *                  of fields generated by this format call.  Field values
    353      *                  are defined in UDateFormatField.  Can be NULL.
    354      * @param status    error status.
    355      * @return          Reference to 'appendTo' parameter.
    356      * @stable ICU 4.4
    357      */
    358     UnicodeString& format(UDate date,
    359                           UnicodeString& appendTo,
    360                           FieldPositionIterator* posIter,
    361                           UErrorCode& status) const;
    362     /**
    363      * Formats a UDate into a date/time string. If there is a problem, you won't
    364      * know, using this method. Use the overloaded format() method which takes a
    365      * FieldPosition& to detect formatting problems.
    366      *
    367      * @param date      The UDate value to be formatted into a string.
    368      * @param appendTo  Output parameter to receive result.
    369      *                  Result is appended to existing contents.
    370      * @return          Reference to 'appendTo' parameter.
    371      * @stable ICU 2.0
    372      */
    373     UnicodeString& format(UDate date, UnicodeString& appendTo) const;
    374 
    375     /**
    376      * Redeclared Format method.
    377      *
    378      * @param obj       The object to be formatted into a string.
    379      * @param appendTo  Output parameter to receive result.
    380      *                  Result is appended to existing contents.
    381      * @param status    Output param filled with success/failure status.
    382      * @return          Reference to 'appendTo' parameter.
    383      * @stable ICU 2.0
    384      */
    385     UnicodeString& format(const Formattable& obj,
    386                           UnicodeString& appendTo,
    387                           UErrorCode& status) const;
    388 
    389     /**
    390      * Parse a date/time string.
    391      *
    392      * @param text      The string to be parsed into a UDate value.
    393      * @param status    Output param to be set to success/failure code. If
    394      *                  'text' cannot be parsed, it will be set to a failure
    395      *                  code.
    396      * @result          The parsed UDate value, if successful.
    397      * @stable ICU 2.0
    398      */
    399     virtual UDate parse( const UnicodeString& text,
    400                         UErrorCode& status) const;
    401 
    402     /**
    403      * Parse a date/time string beginning at the given parse position. For
    404      * example, a time text "07/10/96 4:5 PM, PDT" will be parsed into a Date
    405      * that is equivalent to Date(837039928046).
    406      * <P>
    407      * By default, parsing is lenient: If the input is not in the form used by
    408      * this object's format method but can still be parsed as a date, then the
    409      * parse succeeds. Clients may insist on strict adherence to the format by
    410      * calling setLenient(false).
    411      *
    412      * @see DateFormat::setLenient(boolean)
    413      *
    414      * @param text  The date/time string to be parsed
    415      * @param cal   a Calendar set to the date and time to be formatted
    416      *              into a date/time string.  When the calendar type
    417      *              is different from the internal calendar held by this
    418      *              DateFormat instance, calendar field values will be
    419      *              parsed based on the internal calendar, then the result
    420      *              (time in milliseconds and time zone) will be set in
    421      *              this calendar.
    422      * @param pos   On input, the position at which to start parsing; on
    423      *              output, the position at which parsing terminated, or the
    424      *              start position if the parse failed.
    425      * @return      A valid UDate if the input could be parsed.
    426      * @stable ICU 2.1
    427      */
    428     virtual void parse( const UnicodeString& text,
    429                         Calendar& cal,
    430                         ParsePosition& pos) const = 0;
    431 
    432     /**
    433      * Parse a date/time string beginning at the given parse position. For
    434      * example, a time text "07/10/96 4:5 PM, PDT" will be parsed into a Date
    435      * that is equivalent to Date(837039928046).
    436      * <P>
    437      * By default, parsing is lenient: If the input is not in the form used by
    438      * this object's format method but can still be parsed as a date, then the
    439      * parse succeeds. Clients may insist on strict adherence to the format by
    440      * calling setLenient(false).
    441      *
    442      * @see DateFormat::setLenient(boolean)
    443      *
    444      * @param text  The date/time string to be parsed
    445      * @param pos   On input, the position at which to start parsing; on
    446      *              output, the position at which parsing terminated, or the
    447      *              start position if the parse failed.
    448      * @return      A valid UDate if the input could be parsed.
    449      * @stable ICU 2.0
    450      */
    451     UDate parse( const UnicodeString& text,
    452                  ParsePosition& pos) const;
    453 
    454     /**
    455      * Parse a string to produce an object. This methods handles parsing of
    456      * date/time strings into Formattable objects with UDate types.
    457      * <P>
    458      * Before calling, set parse_pos.index to the offset you want to start
    459      * parsing at in the source. After calling, parse_pos.index is the end of
    460      * the text you parsed. If error occurs, index is unchanged.
    461      * <P>
    462      * When parsing, leading whitespace is discarded (with a successful parse),
    463      * while trailing whitespace is left as is.
    464      * <P>
    465      * See Format::parseObject() for more.
    466      *
    467      * @param source    The string to be parsed into an object.
    468      * @param result    Formattable to be set to the parse result.
    469      *                  If parse fails, return contents are undefined.
    470      * @param parse_pos The position to start parsing at. Upon return
    471      *                  this param is set to the position after the
    472      *                  last character successfully parsed. If the
    473      *                  source is not parsed successfully, this param
    474      *                  will remain unchanged.
    475      * @return          A newly created Formattable* object, or NULL
    476      *                  on failure.  The caller owns this and should
    477      *                  delete it when done.
    478      * @stable ICU 2.0
    479      */
    480     virtual void parseObject(const UnicodeString& source,
    481                              Formattable& result,
    482                              ParsePosition& parse_pos) const;
    483 
    484     /**
    485      * Create a default date/time formatter that uses the SHORT style for both
    486      * the date and the time.
    487      *
    488      * @return A date/time formatter which the caller owns.
    489      * @stable ICU 2.0
    490      */
    491     static DateFormat* U_EXPORT2 createInstance(void);
    492 
    493     /**
    494      * Creates a time formatter with the given formatting style for the given
    495      * locale.
    496      *
    497      * @param style     The given formatting style. For example,
    498      *                  SHORT for "h:mm a" in the US locale. Relative
    499      *                  time styles are not currently supported.
    500      * @param aLocale   The given locale.
    501      * @return          A time formatter which the caller owns.
    502      * @stable ICU 2.0
    503      */
    504     static DateFormat* U_EXPORT2 createTimeInstance(EStyle style = kDefault,
    505                                           const Locale& aLocale = Locale::getDefault());
    506 
    507     /**
    508      * Creates a date formatter with the given formatting style for the given
    509      * const locale.
    510      *
    511      * @param style     The given formatting style. For example,
    512      *                  SHORT for "M/d/yy" in the US locale.
    513      * @param aLocale   The given locale.
    514      * @return          A date formatter which the caller owns.
    515      * @stable ICU 2.0
    516      */
    517     static DateFormat* U_EXPORT2 createDateInstance(EStyle style = kDefault,
    518                                           const Locale& aLocale = Locale::getDefault());
    519 
    520     /**
    521      * Creates a date/time formatter with the given formatting styles for the
    522      * given locale.
    523      *
    524      * @param dateStyle The given formatting style for the date portion of the result.
    525      *                  For example, SHORT for "M/d/yy" in the US locale.
    526      * @param timeStyle The given formatting style for the time portion of the result.
    527      *                  For example, SHORT for "h:mm a" in the US locale. Relative
    528      *                  time styles are not currently supported.
    529      * @param aLocale   The given locale.
    530      * @return          A date/time formatter which the caller owns.
    531      * @stable ICU 2.0
    532      */
    533     static DateFormat* U_EXPORT2 createDateTimeInstance(EStyle dateStyle = kDefault,
    534                                               EStyle timeStyle = kDefault,
    535                                               const Locale& aLocale = Locale::getDefault());
    536 
    537     /**
    538      * Gets the set of locales for which DateFormats are installed.
    539      * @param count Filled in with the number of locales in the list that is returned.
    540      * @return the set of locales for which DateFormats are installed.  The caller
    541      *  does NOT own this list and must not delete it.
    542      * @stable ICU 2.0
    543      */
    544     static const Locale* U_EXPORT2 getAvailableLocales(int32_t& count);
    545 
    546     /**
    547      * Returns true if the formatter is set for lenient parsing.
    548      * @stable ICU 2.0
    549      */
    550     virtual UBool isLenient(void) const;
    551 
    552     /**
    553      * Specify whether or not date/time parsing is to be lenient. With lenient
    554      * parsing, the parser may use heuristics to interpret inputs that do not
    555      * precisely match this object's format. With strict parsing, inputs must
    556      * match this object's format.
    557      *
    558      * @param lenient  True specifies date/time interpretation to be lenient.
    559      * @see Calendar::setLenient
    560      * @stable ICU 2.0
    561      */
    562     virtual void setLenient(UBool lenient);
    563 
    564     /**
    565      * Gets the calendar associated with this date/time formatter.
    566      * @return the calendar associated with this date/time formatter.
    567      * @stable ICU 2.0
    568      */
    569     virtual const Calendar* getCalendar(void) const;
    570 
    571     /**
    572      * Set the calendar to be used by this date format. Initially, the default
    573      * calendar for the specified or default locale is used.  The caller should
    574      * not delete the Calendar object after it is adopted by this call.
    575      * Adopting a new calendar will change to the default symbols.
    576      *
    577      * @param calendarToAdopt    Calendar object to be adopted.
    578      * @stable ICU 2.0
    579      */
    580     virtual void adoptCalendar(Calendar* calendarToAdopt);
    581 
    582     /**
    583      * Set the calendar to be used by this date format. Initially, the default
    584      * calendar for the specified or default locale is used.
    585      *
    586      * @param newCalendar Calendar object to be set.
    587      * @stable ICU 2.0
    588      */
    589     virtual void setCalendar(const Calendar& newCalendar);
    590 
    591 
    592     /**
    593      * Gets the number formatter which this date/time formatter uses to format
    594      * and parse the numeric portions of the pattern.
    595      * @return the number formatter which this date/time formatter uses.
    596      * @stable ICU 2.0
    597      */
    598     virtual const NumberFormat* getNumberFormat(void) const;
    599 
    600     /**
    601      * Allows you to set the number formatter.  The caller should
    602      * not delete the NumberFormat object after it is adopted by this call.
    603      * @param formatToAdopt     NumberFormat object to be adopted.
    604      * @stable ICU 2.0
    605      */
    606     virtual void adoptNumberFormat(NumberFormat* formatToAdopt);
    607 
    608     /**
    609      * Allows you to set the number formatter.
    610      * @param newNumberFormat  NumberFormat object to be set.
    611      * @stable ICU 2.0
    612      */
    613     virtual void setNumberFormat(const NumberFormat& newNumberFormat);
    614 
    615     /**
    616      * Returns a reference to the TimeZone used by this DateFormat's calendar.
    617      * @return the time zone associated with the calendar of DateFormat.
    618      * @stable ICU 2.0
    619      */
    620     virtual const TimeZone& getTimeZone(void) const;
    621 
    622     /**
    623      * Sets the time zone for the calendar of this DateFormat object. The caller
    624      * no longer owns the TimeZone object and should not delete it after this call.
    625      * @param zoneToAdopt the TimeZone to be adopted.
    626      * @stable ICU 2.0
    627      */
    628     virtual void adoptTimeZone(TimeZone* zoneToAdopt);
    629 
    630     /**
    631      * Sets the time zone for the calendar of this DateFormat object.
    632      * @param zone the new time zone.
    633      * @stable ICU 2.0
    634      */
    635     virtual void setTimeZone(const TimeZone& zone);
    636 
    637 protected:
    638     /**
    639      * Default constructor.  Creates a DateFormat with no Calendar or NumberFormat
    640      * associated with it.  This constructor depends on the subclasses to fill in
    641      * the calendar and numberFormat fields.
    642      * @stable ICU 2.0
    643      */
    644     DateFormat();
    645 
    646     /**
    647      * Copy constructor.
    648      * @stable ICU 2.0
    649      */
    650     DateFormat(const DateFormat&);
    651 
    652     /**
    653      * Default assignment operator.
    654      * @stable ICU 2.0
    655      */
    656     DateFormat& operator=(const DateFormat&);
    657 
    658     /**
    659      * The calendar that DateFormat uses to produce the time field values needed
    660      * to implement date/time formatting. Subclasses should generally initialize
    661      * this to the default calendar for the locale associated with this DateFormat.
    662      * @stable ICU 2.4
    663      */
    664     Calendar* fCalendar;
    665 
    666     /**
    667      * The number formatter that DateFormat uses to format numbers in dates and
    668      * times. Subclasses should generally initialize this to the default number
    669      * format for the locale associated with this DateFormat.
    670      * @stable ICU 2.4
    671      */
    672     NumberFormat* fNumberFormat;
    673 
    674 private:
    675     /**
    676      * Gets the date/time formatter with the given formatting styles for the
    677      * given locale.
    678      * @param dateStyle the given date formatting style.
    679      * @param timeStyle the given time formatting style.
    680      * @param inLocale the given locale.
    681      * @return a date/time formatter, or 0 on failure.
    682      */
    683     static DateFormat* U_EXPORT2 create(EStyle timeStyle, EStyle dateStyle, const Locale&);
    684 
    685 public:
    686     /**
    687      * Field selector for FieldPosition for DateFormat fields.
    688      * @obsolete ICU 3.4 use UDateFormatField instead, since this API will be
    689      * removed in that release
    690      */
    691     enum EField
    692     {
    693         // Obsolete; use UDateFormatField instead
    694         kEraField = UDAT_ERA_FIELD,
    695         kYearField = UDAT_YEAR_FIELD,
    696         kMonthField = UDAT_MONTH_FIELD,
    697         kDateField = UDAT_DATE_FIELD,
    698         kHourOfDay1Field = UDAT_HOUR_OF_DAY1_FIELD,
    699         kHourOfDay0Field = UDAT_HOUR_OF_DAY0_FIELD,
    700         kMinuteField = UDAT_MINUTE_FIELD,
    701         kSecondField = UDAT_SECOND_FIELD,
    702         kMillisecondField = UDAT_FRACTIONAL_SECOND_FIELD,
    703         kDayOfWeekField = UDAT_DAY_OF_WEEK_FIELD,
    704         kDayOfYearField = UDAT_DAY_OF_YEAR_FIELD,
    705         kDayOfWeekInMonthField = UDAT_DAY_OF_WEEK_IN_MONTH_FIELD,
    706         kWeekOfYearField = UDAT_WEEK_OF_YEAR_FIELD,
    707         kWeekOfMonthField = UDAT_WEEK_OF_MONTH_FIELD,
    708         kAmPmField = UDAT_AM_PM_FIELD,
    709         kHour1Field = UDAT_HOUR1_FIELD,
    710         kHour0Field = UDAT_HOUR0_FIELD,
    711         kTimezoneField = UDAT_TIMEZONE_FIELD,
    712         kYearWOYField = UDAT_YEAR_WOY_FIELD,
    713         kDOWLocalField = UDAT_DOW_LOCAL_FIELD,
    714         kExtendedYearField = UDAT_EXTENDED_YEAR_FIELD,
    715         kJulianDayField = UDAT_JULIAN_DAY_FIELD,
    716         kMillisecondsInDayField = UDAT_MILLISECONDS_IN_DAY_FIELD,
    717 
    718         // Obsolete; use UDateFormatField instead
    719         ERA_FIELD = UDAT_ERA_FIELD,
    720         YEAR_FIELD = UDAT_YEAR_FIELD,
    721         MONTH_FIELD = UDAT_MONTH_FIELD,
    722         DATE_FIELD = UDAT_DATE_FIELD,
    723         HOUR_OF_DAY1_FIELD = UDAT_HOUR_OF_DAY1_FIELD,
    724         HOUR_OF_DAY0_FIELD = UDAT_HOUR_OF_DAY0_FIELD,
    725         MINUTE_FIELD = UDAT_MINUTE_FIELD,
    726         SECOND_FIELD = UDAT_SECOND_FIELD,
    727         MILLISECOND_FIELD = UDAT_FRACTIONAL_SECOND_FIELD,
    728         DAY_OF_WEEK_FIELD = UDAT_DAY_OF_WEEK_FIELD,
    729         DAY_OF_YEAR_FIELD = UDAT_DAY_OF_YEAR_FIELD,
    730         DAY_OF_WEEK_IN_MONTH_FIELD = UDAT_DAY_OF_WEEK_IN_MONTH_FIELD,
    731         WEEK_OF_YEAR_FIELD = UDAT_WEEK_OF_YEAR_FIELD,
    732         WEEK_OF_MONTH_FIELD = UDAT_WEEK_OF_MONTH_FIELD,
    733         AM_PM_FIELD = UDAT_AM_PM_FIELD,
    734         HOUR1_FIELD = UDAT_HOUR1_FIELD,
    735         HOUR0_FIELD = UDAT_HOUR0_FIELD,
    736         TIMEZONE_FIELD = UDAT_TIMEZONE_FIELD
    737     };
    738 };
    739 
    740 inline UnicodeString&
    741 DateFormat::format(const Formattable& obj,
    742                    UnicodeString& appendTo,
    743                    UErrorCode& status) const {
    744     return Format::format(obj, appendTo, status);
    745 }
    746 U_NAMESPACE_END
    747 
    748 #endif /* #if !UCONFIG_NO_FORMATTING */
    749 
    750 #endif // _DATEFMT
    751 //eof
    752