icuSources/i18n/unicode/datefmt.h

   1 /*
   2  ********************************************************************************
   3  *   Copyright (C) 1997-2016, 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 #include "unicode/enumset.h"
  32 #include "unicode/udisplaycontext.h"
  33
  34 /**
  35  * \file
  36  * \brief C++ API: Abstract class for converting dates.
  37  */
  38
  39 U_NAMESPACE_BEGIN
  40
  41 class TimeZone;
  42 class DateTimePatternGenerator;
  43
  44 // explicit template instantiation. see digitlst.h
  45 #if defined (_MSC_VER)
  46 template class U_I18N_API EnumSet<UDateFormatBooleanAttribute,
  47             0,
  48             UDAT_BOOLEAN_ATTRIBUTE_COUNT>;
  49 #endif
  50
  51 /**
  52  * DateFormat is an abstract class for a family of classes that convert dates and
  53  * times from their internal representations to textual form and back again in a
  54  * language-independent manner. Converting from the internal representation (milliseconds
  55  * since midnight, January 1, 1970) to text is known as "formatting," and converting
  56  * from text to millis is known as "parsing."  We currently define only one concrete
  57  * subclass of DateFormat: SimpleDateFormat, which can handle pretty much all normal
  58  * date formatting and parsing actions.
  59  * <P>
  60  * DateFormat helps you to format and parse dates for any locale. Your code can
  61  * be completely independent of the locale conventions for months, days of the
  62  * week, or even the calendar format: lunar vs. solar.
  63  * <P>
  64  * To format a date for the current Locale, use one of the static factory
  65  * methods:
  66  * <pre>
  67  * \code
  68  *      DateFormat* dfmt = DateFormat::createDateInstance();
  69  *      UDate myDate = Calendar::getNow();
  70  *      UnicodeString myString;
  71  *      myString = dfmt->format( myDate, myString );
  72  * \endcode
  73  * </pre>
  74  * If you are formatting multiple numbers, it is more efficient to get the
  75  * format and use it multiple times so that the system doesn't have to fetch the
  76  * information about the local language and country conventions multiple times.
  77  * <pre>
  78  * \code
  79  *      DateFormat* df = DateFormat::createDateInstance();
  80  *      UnicodeString myString;
  81  *      UDate myDateArr[] = { 0.0, 100000000.0, 2000000000.0 }; // test values
  82  *      for (int32_t i = 0; i < 3; ++i) {
  83  *          myString.remove();
  84  *          cout << df->format( myDateArr[i], myString ) << endl;
  85  *      }
  86  * \endcode
  87  * </pre>
  88  * To get specific fields of a date, you can use UFieldPosition to
  89  * get specific fields.
  90  * <pre>
  91  * \code
  92  *      DateFormat* dfmt = DateFormat::createDateInstance();
  93  *      FieldPosition pos(DateFormat::YEAR_FIELD);
  94  *      UnicodeString myString;
  95  *      myString = dfmt->format( myDate, myString );
  96  *      cout << myString << endl;
  97  *      cout << pos.getBeginIndex() << "," << pos. getEndIndex() << endl;
  98  * \endcode
  99  * </pre>
 100  * To format a date for a different Locale, specify it in the call to
 101  * createDateInstance().
 102  * <pre>
 103  * \code
 104  *       DateFormat* df =
 105  *           DateFormat::createDateInstance( DateFormat::SHORT, Locale::getFrance());
 106  * \endcode
 107  * </pre>
 108  * You can use a DateFormat to parse also.
 109  * <pre>
 110  * \code
 111  *       UErrorCode status = U_ZERO_ERROR;
 112  *       UDate myDate = df->parse(myString, status);
 113  * \endcode
 114  * </pre>
 115  * Use createDateInstance() to produce the normal date format for that country.
 116  * There are other static factory methods available. Use createTimeInstance()
 117  * to produce the normal time format for that country. Use createDateTimeInstance()
 118  * to produce a DateFormat that formats both date and time. You can pass in
 119  * different options to these factory methods to control the length of the
 120  * result; from SHORT to MEDIUM to LONG to FULL. The exact result depends on the
 121  * locale, but generally:
 122  * <ul type=round>
 123  *   <li>   SHORT is completely numeric, such as 12/13/52 or 3:30pm
 124  *   <li>   MEDIUM is longer, such as Jan 12, 1952
 125  *   <li>   LONG is longer, such as January 12, 1952 or 3:30:32pm
 126  *   <li>   FULL is pretty completely specified, such as
 127  *          Tuesday, April 12, 1952 AD or 3:30:42pm PST.
 128  * </ul>
 129  * You can also set the time zone on the format if you wish. If you want even
 130  * more control over the format or parsing, (or want to give your users more
 131  * control), you can try casting the DateFormat you get from the factory methods
 132  * to a SimpleDateFormat. This will work for the majority of countries; just
 133  * remember to chck getDynamicClassID() before carrying out the cast.
 134  * <P>
 135  * You can also use forms of the parse and format methods with ParsePosition and
 136  * FieldPosition to allow you to
 137  * <ul type=round>
 138  *   <li>   Progressively parse through pieces of a string.
 139  *   <li>   Align any particular field, or find out where it is for selection
 140  *          on the screen.
 141  * </ul>
 142  *
 143  * <p><em>User subclasses are not supported.</em> While clients may write
 144  * subclasses, such code will not necessarily work and will not be
 145  * guaranteed to work stably from release to release.
 146  */
 147 class U_I18N_API DateFormat : public Format {
 148 public:
 149
 150     /**
 151      * Constants for various style patterns. These reflect the order of items in
 152      * the DateTimePatterns resource. There are 4 time patterns, 4 date patterns,
 153      * the default date-time pattern, and 4 date-time patterns. Each block of 4 values
 154      * in the resource occurs in the order full, long, medium, short.
 155      * @stable ICU 2.4
 156      */
 157     enum EStyle
 158     {
 159         kNone   = -1,
 160
 161         kFull   = 0,
 162         kLong   = 1,
 163         kMedium = 2,
 164         kShort  = 3,
 165
 166         kDateOffset   = kShort + 1,
 167      // kFull   + kDateOffset = 4
 168      // kLong   + kDateOffset = 5
 169      // kMedium + kDateOffset = 6
 170      // kShort  + kDateOffset = 7
 171
 172         kDateTime             = 8,
 173      // Default DateTime
 174
 175         kDateTimeOffset = kDateTime + 1,
 176      // kFull   + kDateTimeOffset = 9
 177      // kLong   + kDateTimeOffset = 10
 178      // kMedium + kDateTimeOffset = 11
 179      // kShort  + kDateTimeOffset = 12
 180
 181         // relative dates
 182         kRelative = (1 << 7),
 183
 184         kFullRelative = (kFull | kRelative),
 185
 186         kLongRelative = kLong | kRelative,
 187
 188         kMediumRelative = kMedium | kRelative,
 189
 190         kShortRelative = kShort | kRelative,
 191
 192
 193         kDefault      = kMedium,
 194
 195
 196
 197     /**
 198      * These constants are provided for backwards compatibility only.
 199      * Please use the C++ style constants defined above.
 200      */
 201         FULL        = kFull,
 202         LONG        = kLong,
 203         MEDIUM        = kMedium,
 204         SHORT        = kShort,
 205         DEFAULT        = kDefault,
 206         DATE_OFFSET    = kDateOffset,
 207         NONE        = kNone,
 208         DATE_TIME    = kDateTime
 209     };
 210
 211     /**
 212      * Destructor.
 213      * @stable ICU 2.0
 214      */
 215     virtual ~DateFormat();
 216
 217     /**
 218      * Equality operator.  Returns true if the two formats have the same behavior.
 219      * @stable ICU 2.0
 220      */
 221     virtual UBool operator==(const Format&) const;
 222
 223
 224     using Format::format;
 225
 226     /**
 227      * Format an object to produce a string. This method handles Formattable
 228      * objects with a UDate type. If a the Formattable object type is not a Date,
 229      * then it returns a failing UErrorCode.
 230      *
 231      * @param obj       The object to format. Must be a Date.
 232      * @param appendTo  Output parameter to receive result.
 233      *                  Result is appended to existing contents.
 234      * @param pos       On input: an alignment field, if desired.
 235      *                  On output: the offsets of the alignment field.
 236      * @param status    Output param filled with success/failure status.
 237      * @return          Reference to 'appendTo' parameter.
 238      * @stable ICU 2.0
 239      */
 240     virtual UnicodeString& format(const Formattable& obj,
 241                                   UnicodeString& appendTo,
 242                                   FieldPosition& pos,
 243                                   UErrorCode& status) const;
 244
 245     /**
 246      * Format an object to produce a string. This method handles Formattable
 247      * objects with a UDate type. If a the Formattable object type is not a Date,
 248      * then it returns a failing UErrorCode.
 249      *
 250      * @param obj       The object to format. Must be a Date.
 251      * @param appendTo  Output parameter to receive result.
 252      *                  Result is appended to existing contents.
 253      * @param posIter   On return, can be used to iterate over positions
 254      *                  of fields generated by this format call.  Field values
 255      *                  are defined in UDateFormatField.  Can be NULL.
 256      * @param status    Output param filled with success/failure status.
 257      * @return          Reference to 'appendTo' parameter.
 258      * @stable ICU 4.4
 259      */
 260     virtual UnicodeString& format(const Formattable& obj,
 261                                   UnicodeString& appendTo,
 262                                   FieldPositionIterator* posIter,
 263                                   UErrorCode& status) const;
 264     /**
 265      * Formats a date into a date/time string. This is an abstract method which
 266      * concrete subclasses must implement.
 267      * <P>
 268      * On input, the FieldPosition parameter may have its "field" member filled with
 269      * an enum value specifying a field.  On output, the FieldPosition will be filled
 270      * in with the text offsets for that field.
 271      * <P> For example, given a time text
 272      * "1996.07.10 AD at 15:08:56 PDT", if the given fieldPosition.field is
 273      * UDAT_YEAR_FIELD, the offsets fieldPosition.beginIndex and
 274      * statfieldPositionus.getEndIndex will be set to 0 and 4, respectively.
 275      * <P> Notice
 276      * that if the same time field appears more than once in a pattern, the status will
 277      * be set for the first occurence of that time field. For instance,
 278      * formatting a UDate to the time string "1 PM PDT (Pacific Daylight Time)"
 279      * using the pattern "h a z (zzzz)" and the alignment field
 280      * DateFormat::TIMEZONE_FIELD, the offsets fieldPosition.beginIndex and
 281      * fieldPosition.getEndIndex will be set to 5 and 8, respectively, for the first
 282      * occurence of the timezone pattern character 'z'.
 283      *
 284      * @param cal           Calendar set to the date and time to be formatted
 285      *                      into a date/time string.  When the calendar type is
 286      *                      different from the internal calendar held by this
 287      *                      DateFormat instance, the date and the time zone will
 288      *                      be inherited from the input calendar, but other calendar
 289      *                      field values will be calculated by the internal calendar.
 290      * @param appendTo      Output parameter to receive result.
 291      *                      Result is appended to existing contents.
 292      * @param fieldPosition On input: an alignment field, if desired (see examples above)
 293      *                      On output: the offsets of the alignment field (see examples above)
 294      * @return              Reference to 'appendTo' parameter.
 295      * @stable ICU 2.1
 296      */
 297     virtual UnicodeString& format(  Calendar& cal,
 298                                     UnicodeString& appendTo,
 299                                     FieldPosition& fieldPosition) const = 0;
 300
 301     /**
 302      * Formats a date into a date/time string. Subclasses should implement this method.
 303      *
 304      * @param cal       Calendar set to the date and time to be formatted
 305      *                  into a date/time string.  When the calendar type is
 306      *                  different from the internal calendar held by this
 307      *                  DateFormat instance, the date and the time zone will
 308      *                  be inherited from the input calendar, but other calendar
 309      *                  field values will be calculated by the internal calendar.
 310      * @param appendTo  Output parameter to receive result.
 311      *                  Result is appended to existing contents.
 312      * @param posIter   On return, can be used to iterate over positions
 313      *                  of fields generated by this format call.  Field values
 314      *                  are defined in UDateFormatField.  Can be NULL.
 315      * @param status    error status.
 316      * @return          Reference to 'appendTo' parameter.
 317      * @stable ICU 4.4
 318      */
 319     virtual UnicodeString& format(Calendar& cal,
 320                                   UnicodeString& appendTo,
 321                                   FieldPositionIterator* posIter,
 322                                   UErrorCode& status) const;
 323     /**
 324      * Formats a UDate into a date/time string.
 325      * <P>
 326      * On input, the FieldPosition parameter may have its "field" member filled with
 327      * an enum value specifying a field.  On output, the FieldPosition will be filled
 328      * in with the text offsets for that field.
 329      * <P> For example, given a time text
 330      * "1996.07.10 AD at 15:08:56 PDT", if the given fieldPosition.field is
 331      * UDAT_YEAR_FIELD, the offsets fieldPosition.beginIndex and
 332      * statfieldPositionus.getEndIndex will be set to 0 and 4, respectively.
 333      * <P> Notice
 334      * that if the same time field appears more than once in a pattern, the status will
 335      * be set for the first occurence of that time field. For instance,
 336      * formatting a UDate to the time string "1 PM PDT (Pacific Daylight Time)"
 337      * using the pattern "h a z (zzzz)" and the alignment field
 338      * DateFormat::TIMEZONE_FIELD, the offsets fieldPosition.beginIndex and
 339      * fieldPosition.getEndIndex will be set to 5 and 8, respectively, for the first
 340      * occurence of the timezone pattern character 'z'.
 341      *
 342      * @param date          UDate to be formatted into a date/time string.
 343      * @param appendTo      Output parameter to receive result.
 344      *                      Result is appended to existing contents.
 345      * @param fieldPosition On input: an alignment field, if desired (see examples above)
 346      *                      On output: the offsets of the alignment field (see examples above)
 347      * @return              Reference to 'appendTo' parameter.
 348      * @stable ICU 2.0
 349      */
 350     UnicodeString& format(  UDate date,
 351                             UnicodeString& appendTo,
 352                             FieldPosition& fieldPosition) const;
 353
 354     /**
 355      * Formats a UDate into a date/time string.
 356      *
 357      * @param date      UDate to be formatted into a date/time string.
 358      * @param appendTo  Output parameter to receive result.
 359      *                  Result is appended to existing contents.
 360      * @param posIter   On return, can be used to iterate over positions
 361      *                  of fields generated by this format call.  Field values
 362      *                  are defined in UDateFormatField.  Can be NULL.
 363      * @param status    error status.
 364      * @return          Reference to 'appendTo' parameter.
 365      * @stable ICU 4.4
 366      */
 367     UnicodeString& format(UDate date,
 368                           UnicodeString& appendTo,
 369                           FieldPositionIterator* posIter,
 370                           UErrorCode& status) const;
 371     /**
 372      * Formats a UDate into a date/time string. If there is a problem, you won't
 373      * know, using this method. Use the overloaded format() method which takes a
 374      * FieldPosition& to detect formatting problems.
 375      *
 376      * @param date      The UDate value to be formatted into a string.
 377      * @param appendTo  Output parameter to receive result.
 378      *                  Result is appended to existing contents.
 379      * @return          Reference to 'appendTo' parameter.
 380      * @stable ICU 2.0
 381      */
 382     UnicodeString& format(UDate date, UnicodeString& appendTo) const;
 383
 384     /**
 385      * Parse a date/time string. For example, a time text "07/10/96 4:5 PM, PDT"
 386      * will be parsed into a UDate that is equivalent to Date(837039928046).
 387      * Parsing begins at the beginning of the string and proceeds as far as
 388      * possible.  Assuming no parse errors were encountered, this function
 389      * doesn't return any information about how much of the string was consumed
 390      * by the parsing.  If you need that information, use the version of
 391      * parse() that takes a ParsePosition.
 392      * <P>
 393      * By default, parsing is lenient: If the input is not in the form used by
 394      * this object's format method but can still be parsed as a date, then the
 395      * parse succeeds. Clients may insist on strict adherence to the format by
 396      * calling setLenient(false).
 397      * @see DateFormat::setLenient(boolean)
 398      * <P>
 399      * Note that the normal date formats associated with some calendars - such
 400      * as the Chinese lunar calendar - do not specify enough fields to enable
 401      * dates to be parsed unambiguously. In the case of the Chinese lunar
 402      * calendar, while the year within the current 60-year cycle is specified,
 403      * the number of such cycles since the start date of the calendar (in the
 404      * ERA field of the Calendar object) is not normally part of the format,
 405      * and parsing may assume the wrong era. For cases such as this it is
 406      * recommended that clients parse using the method
 407      * parse(const UnicodeString&, Calendar& cal, ParsePosition&)
 408      * with the Calendar passed in set to the current date, or to a date
 409      * within the era/cycle that should be assumed if absent in the format.
 410      *
 411      * @param text      The date/time string to be parsed into a UDate value.
 412      * @param status    Output param to be set to success/failure code. If
 413      *                  'text' cannot be parsed, it will be set to a failure
 414      *                  code.
 415      * @return          The parsed UDate value, if successful.
 416      * @stable ICU 2.0
 417      */
 418     virtual UDate parse( const UnicodeString& text,
 419                         UErrorCode& status) const;
 420
 421     /**
 422      * Parse a date/time string beginning at the given parse position. For
 423      * example, a time text "07/10/96 4:5 PM, PDT" will be parsed into a Date
 424      * that is equivalent to Date(837039928046).
 425      * <P>
 426      * By default, parsing is lenient: If the input is not in the form used by
 427      * this object's format method but can still be parsed as a date, then the
 428      * parse succeeds. Clients may insist on strict adherence to the format by
 429      * calling setLenient(false).
 430      * @see DateFormat::setLenient(boolean)
 431      *
 432      * @param text  The date/time string to be parsed.
 433      * @param cal   A Calendar set on input to the date and time to be used for
 434      *              missing values in the date/time string being parsed, and set
 435      *              on output to the parsed date/time. When the calendar type is
 436      *              different from the internal calendar held by this DateFormat
 437      *              instance, the internal calendar will be cloned to a work
 438      *              calendar set to the same milliseconds and time zone as the
 439      *              cal parameter, field values will be parsed based on the work
 440      *              calendar, then the result (milliseconds and time zone) will
 441      *              be set in this calendar.
 442      * @param pos   On input, the position at which to start parsing; on
 443      *              output, the position at which parsing terminated, or the
 444      *              start position if the parse failed.
 445      * @stable ICU 2.1
 446      */
 447     virtual void parse( const UnicodeString& text,
 448                         Calendar& cal,
 449                         ParsePosition& pos) const = 0;
 450
 451     /**
 452      * Parse a date/time string beginning at the given parse position. For
 453      * example, a time text "07/10/96 4:5 PM, PDT" will be parsed into a Date
 454      * that is equivalent to Date(837039928046).
 455      * <P>
 456      * By default, parsing is lenient: If the input is not in the form used by
 457      * this object's format method but can still be parsed as a date, then the
 458      * parse succeeds. Clients may insist on strict adherence to the format by
 459      * calling setLenient(false).
 460      * @see DateFormat::setLenient(boolean)
 461      * <P>
 462      * Note that the normal date formats associated with some calendars - such
 463      * as the Chinese lunar calendar - do not specify enough fields to enable
 464      * dates to be parsed unambiguously. In the case of the Chinese lunar
 465      * calendar, while the year within the current 60-year cycle is specified,
 466      * the number of such cycles since the start date of the calendar (in the
 467      * ERA field of the Calendar object) is not normally part of the format,
 468      * and parsing may assume the wrong era. For cases such as this it is
 469      * recommended that clients parse using the method
 470      * parse(const UnicodeString&, Calendar& cal, ParsePosition&)
 471      * with the Calendar passed in set to the current date, or to a date
 472      * within the era/cycle that should be assumed if absent in the format.
 473      *
 474      * @param text  The date/time string to be parsed into a UDate value.
 475      * @param pos   On input, the position at which to start parsing; on
 476      *              output, the position at which parsing terminated, or the
 477      *              start position if the parse failed.
 478      * @return      A valid UDate if the input could be parsed.
 479      * @stable ICU 2.0
 480      */
 481     UDate parse( const UnicodeString& text,
 482                  ParsePosition& pos) const;
 483
 484     /**
 485      * Parse a string to produce an object. This methods handles parsing of
 486      * date/time strings into Formattable objects with UDate types.
 487      * <P>
 488      * Before calling, set parse_pos.index to the offset you want to start
 489      * parsing at in the source. After calling, parse_pos.index is the end of
 490      * the text you parsed. If error occurs, index is unchanged.
 491      * <P>
 492      * When parsing, leading whitespace is discarded (with a successful parse),
 493      * while trailing whitespace is left as is.
 494      * <P>
 495      * See Format::parseObject() for more.
 496      *
 497      * @param source    The string to be parsed into an object.
 498      * @param result    Formattable to be set to the parse result.
 499      *                  If parse fails, return contents are undefined.
 500      * @param parse_pos The position to start parsing at. Upon return
 501      *                  this param is set to the position after the
 502      *                  last character successfully parsed. If the
 503      *                  source is not parsed successfully, this param
 504      *                  will remain unchanged.
 505      * @stable ICU 2.0
 506      */
 507     virtual void parseObject(const UnicodeString& source,
 508                              Formattable& result,
 509                              ParsePosition& parse_pos) const;
 510
 511     /**
 512      * Create a default date/time formatter that uses the SHORT style for both
 513      * the date and the time.
 514      *
 515      * @return A date/time formatter which the caller owns.
 516      * @stable ICU 2.0
 517      */
 518     static DateFormat* U_EXPORT2 createInstance(void);
 519
 520     /**
 521      * Creates a time formatter with the given formatting style for the given
 522      * locale.
 523      *
 524      * @param style     The given formatting style. For example,
 525      *                  SHORT for "h:mm a" in the US locale. Relative
 526      *                  time styles are not currently supported.
 527      * @param aLocale   The given locale.
 528      * @return          A time formatter which the caller owns.
 529      * @stable ICU 2.0
 530      */
 531     static DateFormat* U_EXPORT2 createTimeInstance(EStyle style = kDefault,
 532                                           const Locale& aLocale = Locale::getDefault());
 533
 534     /**
 535      * Creates a date formatter with the given formatting style for the given
 536      * const locale.
 537      *
 538      * @param style     The given formatting style. For example, SHORT for "M/d/yy" in the
 539      *                  US locale. As currently implemented, relative date formatting only
 540      *                  affects a limited range of calendar days before or after the
 541      *                  current date, based on the CLDR &lt;field type="day"&gt;/&lt;relative&gt; data:
 542      *                  For example, in English, "Yesterday", "Today", and "Tomorrow".
 543      *                  Outside of this range, dates are formatted using the corresponding
 544      *                  non-relative style.
 545      * @param aLocale   The given locale.
 546      * @return          A date formatter which the caller owns.
 547      * @stable ICU 2.0
 548      */
 549     static DateFormat* U_EXPORT2 createDateInstance(EStyle style = kDefault,
 550                                           const Locale& aLocale = Locale::getDefault());
 551
 552     /**
 553      * Creates a date/time formatter with the given formatting styles for the
 554      * given locale.
 555      *
 556      * @param dateStyle The given formatting style for the date portion of the result.
 557      *                  For example, SHORT for "M/d/yy" in the US locale. As currently
 558      *                  implemented, relative date formatting only affects a limited range
 559      *                  of calendar days before or after the current date, based on the
 560      *                  CLDR &lt;field type="day"&gt;/&lt;relative&gt; data: For example, in English,
 561      *                  "Yesterday", "Today", and "Tomorrow". Outside of this range, dates
 562      *                  are formatted using the corresponding non-relative style.
 563      * @param timeStyle The given formatting style for the time portion of the result.
 564      *                  For example, SHORT for "h:mm a" in the US locale. Relative
 565      *                  time styles are not currently supported.
 566      * @param aLocale   The given locale.
 567      * @return          A date/time formatter which the caller owns.
 568      * @stable ICU 2.0
 569      */
 570     static DateFormat* U_EXPORT2 createDateTimeInstance(EStyle dateStyle = kDefault,
 571                                               EStyle timeStyle = kDefault,
 572                                               const Locale& aLocale = Locale::getDefault());
 573
 574 #ifndef U_HIDE_INTERNAL_API
 575     /**
 576      * Returns the best pattern given a skeleton and locale.
 577      * @param locale the locale
 578      * @param skeleton the skeleton
 579      * @param status ICU error returned here
 580      * @return the best pattern.
 581      * @internal For ICU use only.
 582      */
 583     static UnicodeString getBestPattern(
 584             const Locale &locale,
 585             const UnicodeString &skeleton,
 586             UErrorCode &status);
 587 #endif  /* U_HIDE_INTERNAL_API */
 588
 589     /**
 590      * Creates a date/time formatter for the given skeleton and
 591      * default locale.
 592      *
 593      * @param skeleton The skeleton e.g "yMMMMd." Fields in the skeleton can
 594      *                 be in any order, and this method uses the locale to
 595      *                 map the skeleton to a pattern that includes locale
 596      *                 specific separators with the fields in the appropriate
 597      *                 order for that locale.
 598      * @param status   Any error returned here.
 599      * @return         A date/time formatter which the caller owns.
 600      * @stable ICU 55
 601      */
 602     static DateFormat* U_EXPORT2 createInstanceForSkeleton(
 603             const UnicodeString& skeleton,
 604             UErrorCode &status);
 605
 606     /**
 607      * Creates a date/time formatter for the given skeleton and locale.
 608      *
 609      * @param skeleton The skeleton e.g "yMMMMd." Fields in the skeleton can
 610      *                 be in any order, and this method uses the locale to
 611      *                 map the skeleton to a pattern that includes locale
 612      *                 specific separators with the fields in the appropriate
 613      *                 order for that locale.
 614      * @param locale  The given locale.
 615      * @param status   Any error returned here.
 616      * @return         A date/time formatter which the caller owns.
 617      * @stable ICU 55
 618      */
 619     static DateFormat* U_EXPORT2 createInstanceForSkeleton(
 620             const UnicodeString& skeleton,
 621             const Locale &locale,
 622             UErrorCode &status);
 623
 624     /**
 625      * Creates a date/time formatter for the given skeleton and locale.
 626      *
 627      * @param calendarToAdopt the calendar returned DateFormat is to use.
 628      * @param skeleton The skeleton e.g "yMMMMd." Fields in the skeleton can
 629      *                 be in any order, and this method uses the locale to
 630      *                 map the skeleton to a pattern that includes locale
 631      *                 specific separators with the fields in the appropriate
 632      *                 order for that locale.
 633      * @param locale  The given locale.
 634      * @param status   Any error returned here.
 635      * @return         A date/time formatter which the caller owns.
 636      * @stable ICU 55
 637      */
 638     static DateFormat* U_EXPORT2 createInstanceForSkeleton(
 639             Calendar *calendarToAdopt,
 640             const UnicodeString& skeleton,
 641             const Locale &locale,
 642             UErrorCode &status);
 643
 644
 645     /**
 646      * Gets the set of locales for which DateFormats are installed.
 647      * @param count Filled in with the number of locales in the list that is returned.
 648      * @return the set of locales for which DateFormats are installed.  The caller
 649      *  does NOT own this list and must not delete it.
 650      * @stable ICU 2.0
 651      */
 652     static const Locale* U_EXPORT2 getAvailableLocales(int32_t& count);
 653
 654     /**
 655      * Returns whether both date/time parsing in the encapsulated Calendar object and DateFormat whitespace &
 656      * numeric processing is lenient.
 657      * @stable ICU 2.0
 658      */
 659     virtual UBool isLenient(void) const;
 660
 661     /**
 662      * Specifies whether date/time parsing is to be lenient.  With
 663      * lenient parsing, the parser may use heuristics to interpret inputs that
 664      * do not precisely match this object's format.  Without lenient parsing,
 665      * inputs must match this object's format more closely.
 666      *
 667      * Note: ICU 53 introduced finer grained control of leniency (and added
 668      * new control points) making the preferred method a combination of
 669      * setCalendarLenient() & setBooleanAttribute() calls.
 670      * This method supports prior functionality but may not support all
 671      * future leniency control & behavior of DateFormat. For control of pre 53 leniency,
 672      * Calendar and DateFormat whitespace & numeric tolerance, this method is safe to
 673      * use. However, mixing leniency control via this method and modification of the
 674      * newer attributes via setBooleanAttribute() may produce undesirable
 675      * results.
 676      *
 677      * @param lenient  True specifies date/time interpretation to be lenient.
 678      * @see Calendar::setLenient
 679      * @stable ICU 2.0
 680      */
 681     virtual void setLenient(UBool lenient);
 682
 683
 684     /**
 685      * Returns whether date/time parsing in the encapsulated Calendar object processing is lenient.
 686      * @stable ICU 53
 687      */
 688     virtual UBool isCalendarLenient(void) const;
 689
 690
 691     /**
 692      * Specifies whether encapsulated Calendar date/time parsing is to be lenient.  With
 693      * lenient parsing, the parser may use heuristics to interpret inputs that
 694      * do not precisely match this object's format.  Without lenient parsing,
 695      * inputs must match this object's format more closely.
 696      * @param lenient when true, parsing is lenient
 697      * @see com.ibm.icu.util.Calendar#setLenient
 698      * @stable ICU 53
 699      */
 700     virtual void setCalendarLenient(UBool lenient);
 701
 702
 703     /**
 704      * Gets the calendar associated with this date/time formatter.
 705      * The calendar is owned by the formatter and must not be modified.
 706      * Also, the calendar does not reflect the results of a parse operation.
 707      * To parse to a calendar, use {@link #parse(const UnicodeString&, Calendar& cal, ParsePosition&) const parse(const UnicodeString&, Calendar& cal, ParsePosition&)}
 708      * @return the calendar associated with this date/time formatter.
 709      * @stable ICU 2.0
 710      */
 711     virtual const Calendar* getCalendar(void) const;
 712
 713     /**
 714      * Set the calendar to be used by this date format. Initially, the default
 715      * calendar for the specified or default locale is used.  The caller should
 716      * not delete the Calendar object after it is adopted by this call.
 717      * Adopting a new calendar will change to the default symbols.
 718      *
 719      * @param calendarToAdopt    Calendar object to be adopted.
 720      * @stable ICU 2.0
 721      */
 722     virtual void adoptCalendar(Calendar* calendarToAdopt);
 723
 724     /**
 725      * Set the calendar to be used by this date format. Initially, the default
 726      * calendar for the specified or default locale is used.
 727      *
 728      * @param newCalendar Calendar object to be set.
 729      * @stable ICU 2.0
 730      */
 731     virtual void setCalendar(const Calendar& newCalendar);
 732
 733
 734     /**
 735      * Gets the number formatter which this date/time formatter uses to format
 736      * and parse the numeric portions of the pattern.
 737      * @return the number formatter which this date/time formatter uses.
 738      * @stable ICU 2.0
 739      */
 740     virtual const NumberFormat* getNumberFormat(void) const;
 741
 742     /**
 743      * Allows you to set the number formatter.  The caller should
 744      * not delete the NumberFormat object after it is adopted by this call.
 745      * @param formatToAdopt     NumberFormat object to be adopted.
 746      * @stable ICU 2.0
 747      */
 748     virtual void adoptNumberFormat(NumberFormat* formatToAdopt);
 749
 750     /**
 751      * Allows you to set the number formatter.
 752      * @param newNumberFormat  NumberFormat object to be set.
 753      * @stable ICU 2.0
 754      */
 755     virtual void setNumberFormat(const NumberFormat& newNumberFormat);
 756
 757     /**
 758      * Returns a reference to the TimeZone used by this DateFormat's calendar.
 759      * @return the time zone associated with the calendar of DateFormat.
 760      * @stable ICU 2.0
 761      */
 762     virtual const TimeZone& getTimeZone(void) const;
 763
 764     /**
 765      * Sets the time zone for the calendar of this DateFormat object. The caller
 766      * no longer owns the TimeZone object and should not delete it after this call.
 767      * @param zoneToAdopt the TimeZone to be adopted.
 768      * @stable ICU 2.0
 769      */
 770     virtual void adoptTimeZone(TimeZone* zoneToAdopt);
 771
 772     /**
 773      * Sets the time zone for the calendar of this DateFormat object.
 774      * @param zone the new time zone.
 775      * @stable ICU 2.0
 776      */
 777     virtual void setTimeZone(const TimeZone& zone);
 778
 779     /**
 780      * Set a particular UDisplayContext value in the formatter, such as
 781      * UDISPCTX_CAPITALIZATION_FOR_STANDALONE.
 782      * @param value The UDisplayContext value to set.
 783      * @param status Input/output status. If at entry this indicates a failure
 784      *               status, the function will do nothing; otherwise this will be
 785      *               updated with any new status from the function.
 786      * @stable ICU 53
 787      */
 788     virtual void setContext(UDisplayContext value, UErrorCode& status);
 789
 790     /**
 791      * Get the formatter's UDisplayContext value for the specified UDisplayContextType,
 792      * such as UDISPCTX_TYPE_CAPITALIZATION.
 793      * @param type The UDisplayContextType whose value to return
 794      * @param status Input/output status. If at entry this indicates a failure
 795      *               status, the function will do nothing; otherwise this will be
 796      *               updated with any new status from the function.
 797      * @return The UDisplayContextValue for the specified type.
 798      * @stable ICU 53
 799      */
 800     virtual UDisplayContext getContext(UDisplayContextType type, UErrorCode& status) const;
 801
 802    /**
 803      * Sets an boolean attribute on this DateFormat.
 804      * May return U_UNSUPPORTED_ERROR if this instance does not support
 805      * the specified attribute.
 806      * @param attr the attribute to set
 807      * @param newvalue new value
 808      * @param status the error type
 809      * @return *this - for chaining (example: format.setAttribute(...).setAttribute(...) )
 810      * @stable ICU 53
 811      */
 812
 813     virtual DateFormat&  U_EXPORT2 setBooleanAttribute(UDateFormatBooleanAttribute attr,
 814                                                                         UBool newvalue,
 815                                                                         UErrorCode &status);
 816
 817     /**
 818      * Returns a boolean from this DateFormat
 819      * May return U_UNSUPPORTED_ERROR if this instance does not support
 820      * the specified attribute.
 821      * @param attr the attribute to set
 822      * @param status the error type
 823      * @return the attribute value. Undefined if there is an error.
 824      * @stable ICU 53
 825      */
 826     virtual UBool U_EXPORT2 getBooleanAttribute(UDateFormatBooleanAttribute attr, UErrorCode &status) const;
 827
 828 protected:
 829     /**
 830      * Default constructor.  Creates a DateFormat with no Calendar or NumberFormat
 831      * associated with it.  This constructor depends on the subclasses to fill in
 832      * the calendar and numberFormat fields.
 833      * @stable ICU 2.0
 834      */
 835     DateFormat();
 836
 837     /**
 838      * Copy constructor.
 839      * @stable ICU 2.0
 840      */
 841     DateFormat(const DateFormat&);
 842
 843     /**
 844      * Default assignment operator.
 845      * @stable ICU 2.0
 846      */
 847     DateFormat& operator=(const DateFormat&);
 848
 849     /**
 850      * The calendar that DateFormat uses to produce the time field values needed
 851      * to implement date/time formatting. Subclasses should generally initialize
 852      * this to the default calendar for the locale associated with this DateFormat.
 853      * @stable ICU 2.4
 854      */
 855     Calendar* fCalendar;
 856
 857     /**
 858      * The number formatter that DateFormat uses to format numbers in dates and
 859      * times. Subclasses should generally initialize this to the default number
 860      * format for the locale associated with this DateFormat.
 861      * @stable ICU 2.4
 862      */
 863     NumberFormat* fNumberFormat;
 864
 865
 866 private:
 867
 868     /**
 869      * Gets the date/time formatter with the given formatting styles for the
 870      * given locale.
 871      * @param dateStyle the given date formatting style.
 872      * @param timeStyle the given time formatting style.
 873      * @param inLocale the given locale.
 874      * @return a date/time formatter, or 0 on failure.
 875      */
 876     static DateFormat* U_EXPORT2 create(EStyle timeStyle, EStyle dateStyle, const Locale& inLocale);
 877
 878
 879     /**
 880      * enum set of active boolean attributes for this instance
 881      */
 882     EnumSet<UDateFormatBooleanAttribute, 0, UDAT_BOOLEAN_ATTRIBUTE_COUNT> fBoolFlags;
 883
 884
 885     UDisplayContext fCapitalizationContext;
 886     friend class DateFmtKeyByStyle;
 887
 888 public:
 889 #ifndef U_HIDE_OBSOLETE_API
 890     /**
 891      * Field selector for FieldPosition for DateFormat fields.
 892      * @obsolete ICU 3.4 use UDateFormatField instead, since this API will be
 893      * removed in that release
 894      */
 895     enum EField
 896     {
 897         // Obsolete; use UDateFormatField instead
 898         kEraField = UDAT_ERA_FIELD,
 899         kYearField = UDAT_YEAR_FIELD,
 900         kMonthField = UDAT_MONTH_FIELD,
 901         kDateField = UDAT_DATE_FIELD,
 902         kHourOfDay1Field = UDAT_HOUR_OF_DAY1_FIELD,
 903         kHourOfDay0Field = UDAT_HOUR_OF_DAY0_FIELD,
 904         kMinuteField = UDAT_MINUTE_FIELD,
 905         kSecondField = UDAT_SECOND_FIELD,
 906         kMillisecondField = UDAT_FRACTIONAL_SECOND_FIELD,
 907         kDayOfWeekField = UDAT_DAY_OF_WEEK_FIELD,
 908         kDayOfYearField = UDAT_DAY_OF_YEAR_FIELD,
 909         kDayOfWeekInMonthField = UDAT_DAY_OF_WEEK_IN_MONTH_FIELD,
 910         kWeekOfYearField = UDAT_WEEK_OF_YEAR_FIELD,
 911         kWeekOfMonthField = UDAT_WEEK_OF_MONTH_FIELD,
 912         kAmPmField = UDAT_AM_PM_FIELD,
 913         kHour1Field = UDAT_HOUR1_FIELD,
 914         kHour0Field = UDAT_HOUR0_FIELD,
 915         kTimezoneField = UDAT_TIMEZONE_FIELD,
 916         kYearWOYField = UDAT_YEAR_WOY_FIELD,
 917         kDOWLocalField = UDAT_DOW_LOCAL_FIELD,
 918         kExtendedYearField = UDAT_EXTENDED_YEAR_FIELD,
 919         kJulianDayField = UDAT_JULIAN_DAY_FIELD,
 920         kMillisecondsInDayField = UDAT_MILLISECONDS_IN_DAY_FIELD,
 921
 922         // Obsolete; use UDateFormatField instead
 923         ERA_FIELD = UDAT_ERA_FIELD,
 924         YEAR_FIELD = UDAT_YEAR_FIELD,
 925         MONTH_FIELD = UDAT_MONTH_FIELD,
 926         DATE_FIELD = UDAT_DATE_FIELD,
 927         HOUR_OF_DAY1_FIELD = UDAT_HOUR_OF_DAY1_FIELD,
 928         HOUR_OF_DAY0_FIELD = UDAT_HOUR_OF_DAY0_FIELD,
 929         MINUTE_FIELD = UDAT_MINUTE_FIELD,
 930         SECOND_FIELD = UDAT_SECOND_FIELD,
 931         MILLISECOND_FIELD = UDAT_FRACTIONAL_SECOND_FIELD,
 932         DAY_OF_WEEK_FIELD = UDAT_DAY_OF_WEEK_FIELD,
 933         DAY_OF_YEAR_FIELD = UDAT_DAY_OF_YEAR_FIELD,
 934         DAY_OF_WEEK_IN_MONTH_FIELD = UDAT_DAY_OF_WEEK_IN_MONTH_FIELD,
 935         WEEK_OF_YEAR_FIELD = UDAT_WEEK_OF_YEAR_FIELD,
 936         WEEK_OF_MONTH_FIELD = UDAT_WEEK_OF_MONTH_FIELD,
 937         AM_PM_FIELD = UDAT_AM_PM_FIELD,
 938         HOUR1_FIELD = UDAT_HOUR1_FIELD,
 939         HOUR0_FIELD = UDAT_HOUR0_FIELD,
 940         TIMEZONE_FIELD = UDAT_TIMEZONE_FIELD
 941     };
 942 #endif  /* U_HIDE_OBSOLETE_API */
 943 };
 944
 945 U_NAMESPACE_END
 946
 947 #endif /* #if !UCONFIG_NO_FORMATTING */
 948
 949 #endif // _DATEFMT
 950 //eof