540 lines
23 KiB
C++
540 lines
23 KiB
C++
/*
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********************************************************************************
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* *
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* COPYRIGHT: *
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* (C) Copyright Taligent, Inc., 1997 *
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* (C) Copyright International Business Machines Corporation, 1997-1999 *
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* Copyright (C) 1999 Alan Liu and others. All rights reserved. *
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* Licensed Material - Program-Property of IBM - All Rights Reserved. *
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* US Government Users Restricted Rights - Use, duplication, or disclosure *
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* restricted by GSA ADP Schedule Contract with IBM Corp. *
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* *
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********************************************************************************
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*
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* File DATEFMT.H
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*
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* Modification History:
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*
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* Date Name Description
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* 02/19/97 aliu Converted from java.
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* 04/01/97 aliu Added support for centuries.
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* 07/23/98 stephen JDK 1.2 sync
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********************************************************************************
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*/
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#ifndef DATEFMT_H
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#define DATEFMT_H
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#include "utypes.h"
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#include "calendar.h"
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#include "numfmt.h"
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#include "format.h"
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#include "locid.h"
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class TimeZone;
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/**
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* DateFormat is an abstract class for a family of classes that convert dates and
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* times from their internal representations to textual form and back again in a
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* language-independent manner. Converting from the internal representation (milliseconds
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* since midnight, January 1, 1970) to text is known as "formatting," and converting
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* from text to millis is known as "parsing." We currently define only one concrete
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* subclass of DateFormat: SimpleDateFormat, which can handle pretty much all normal
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* date formatting and parsing actions.
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* <P>
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* DateFormat helps you to format and parse dates for any locale. Your code can
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* be completely independent of the locale conventions for months, days of the
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* week, or even the calendar format: lunar vs. solar.
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* <P>
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* To format a date for the current Locale, use one of the static factory
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* methods:
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* <pre>
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* . DateFormat* dfmt = DateFormat::createDateInstance();
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* . UnicodeString myString;
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* . myString = dfmt->format( myDate, myString );
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* </pre>
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* If you are formatting multiple numbers, it is more efficient to get the
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* format and use it multiple times so that the system doesn't have to fetch the
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* information about the local language and country conventions multiple times.
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* <pre>
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* . DateFormat* df = DateFormat::createDateInstance();
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* . UnicodeString myString;
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* . UDate myDateArr[] = { 0.0, 100000000.0, 2000000000.0 }; // test values
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* . for (int32_t i = 0; i < 3; ++i) {
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* . myString.remove();
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* . cout << df->format( myDateArr[i], myString ) << endl;
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* . }
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* </pre>
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* To format a date for a different Locale, specify it in the call to
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* getDateInstance().
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* <pre>
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* . DateFormat* df =
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* . DateFormat::createDateInstance( DateFormat::SHORT, Locale::FRANCE);
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* </pre>
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* You can use a DateFormat to parse also.
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* <pre>
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* . UErrorCode status = U_ZERO_ERROR;
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* . UDate myDate = df->parse(myString, status);
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* </pre>
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* Use createDateInstance() to produce the normal date format for that country.
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* There are other static factory methods available. Use createTimeInstance()
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* to produce the normal time format for that country. Use createDateTimeInstance()
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* to produce a DateFormat that formats both date and time. You can pass in
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* different options to these factory methods to control the length of the
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* result; from SHORT to MEDIUM to LONG to FULL. The exact result depends on the
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* locale, but generally:
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* <ul type=round>
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* <li> SHORT is completely numeric, such as 12/13/52 or 3:30pm
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* <li> MEDIUM is longer, such as Jan 12, 1952
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* <li> LONG is longer, such as January 12, 1952 or 3:30:32pm
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* <li> FULL is pretty completely specified, such as
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* Tuesday, April 12, 1952 AD or 3:30:42pm PST.
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* </ul>
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* You can also set the time zone on the format if you wish. If you want even
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* more control over the format or parsing, (or want to give your users more
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* control), you can try casting the DateFormat you get from the factory methods
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* to a SimpleDateFormat. This will work for the majority of countries; just
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* remember to chck getDynamicClassID() before carrying out the cast.
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* <P>
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* You can also use forms of the parse and format methods with ParsePosition and
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* FieldPosition to allow you to
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* <ul type=round>
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* <li> Progressively parse through pieces of a string.
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* <li> Align any particular field, or find out where it is for selection
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* on the screen.
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* </ul>
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*/
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class U_I18N_API DateFormat : public Format {
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public:
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/**
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* The following enum values are used in FieldPosition with date/time formatting.
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* They are also used to index into DateFormatSymbols::fgPatternChars, which
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* is the list of standard internal-representation pattern characters, and
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* the resource bundle localPatternChars data. For this reason, this enum
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* should be treated with care; don't change the order or contents of it
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* unless you really know what you are doing. You'll probably have to change
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* the code in DateFormatSymbols, SimpleDateFormat, and all the locale
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* resource bundle data files.
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*/
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enum EField
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{
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kEraField, // ERA field alignment.
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kYearField, // YEAR field alignment.
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kMonthField, // MONTH field alignment.
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kDateField, // DATE field alignment.
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kHourOfDay1Field, // One-based HOUR_OF_DAY field alignment.
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// kHourOfDay1Field is used for the one-based 24-hour clock.
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// For example, 23:59 + 01:00 results in 24:59.
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kHourOfDay0Field, // Zero-based HOUR_OF_DAY field alignment.
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// HOUR_OF_DAY0_FIELD is used for the zero-based 24-hour clock.
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// For example, 23:59 + 01:00 results in 00:59.
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kMinuteField, // MINUTE field alignment.
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kSecondField, // SECOND field alignment.
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kMillisecondField, // MILLISECOND field alignment.
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kDayOfWeekField, // DAY_OF_WEEK field alignment.
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kDayOfYearField, // DAY_OF_YEAR field alignment.
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kDayOfWeekInMonthField,// DAY_OF_WEEK_IN_MONTH field alignment.
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kWeekOfYearField, // WEEK_OF_YEAR field alignment.
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kWeekOfMonthField, // WEEK_OF_MONTH field alignment.
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kAmPmField, // AM_PM field alignment.
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kHour1Field, // One-based HOUR field alignment.
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// HOUR1_FIELD is used for the one-based 12-hour clock.
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// For example, 11:30 PM + 1 hour results in 12:30 AM.
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kHour0Field, // Zero-based HOUR field alignment.
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// HOUR0_FIELD is used for the zero-based 12-hour clock.
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// For example, 11:30 PM + 1 hour results in 00:30 AM.
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kTimezoneField, // TIMEZONE field alignment.
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/**
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* These constants are provided for backwards compatibility only,
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* and are deprecated. Please use the C++ style constants defined above.
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*/
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ERA_FIELD = kEraField,
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YEAR_FIELD = kYearField,
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MONTH_FIELD = kMonthField,
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DATE_FIELD = kDateField,
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HOUR_OF_DAY1_FIELD = kHourOfDay1Field,
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HOUR_OF_DAY0_FIELD = kHourOfDay0Field,
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MINUTE_FIELD = kMinuteField,
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SECOND_FIELD = kSecondField,
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MILLISECOND_FIELD = kMillisecondField,
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DAY_OF_WEEK_FIELD = kDayOfWeekField,
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DAY_OF_YEAR_FIELD = kDayOfYearField,
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DAY_OF_WEEK_IN_MONTH_FIELD = kDayOfWeekInMonthField,
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WEEK_OF_YEAR_FIELD = kWeekOfYearField,
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WEEK_OF_MONTH_FIELD = kWeekOfMonthField,
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AM_PM_FIELD = kAmPmField,
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HOUR1_FIELD = kHour1Field,
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HOUR0_FIELD = kHour0Field,
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TIMEZONE_FIELD = kTimezoneField
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};
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/**
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* Constants for various style patterns. These reflect the order of items in
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* the DateTimePatterns resource. There are 4 time patterns, 4 date patterns,
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* and then the date-time pattern. Each block of 4 values in the resource occurs
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* in the order full, long, medium, short.
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*/
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enum EStyle
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{
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kFull,
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kLong,
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kMedium,
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kShort,
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kDefault = kMedium,
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kDateOffset = 4,
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kNone = -1,
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kDateTime = 8,
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/**
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* These constants are provided for backwards compatibility only,
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* and are deprecated. Please use the C++ style constants defined above.
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*/
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FULL = kFull,
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LONG = kLong,
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MEDIUM = kMedium,
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SHORT = kShort,
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DEFAULT = kDefault,
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DATE_OFFSET = kDateOffset,
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NONE = kNone,
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DATE_TIME = kDateTime
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};
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/**
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* Destructor.
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*/
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virtual ~DateFormat();
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/**
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* Equality operator. Returns true if the two formats have the same behavior.
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*/
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virtual bool_t operator==(const Format&) const;
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/**
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* Format an object to produce a string. This method handles Formattable
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* objects with a UDate type. If a the Formattable object type is not a Date,
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* then it returns a failing UErrorCode.
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*
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* @param obj The object to format. Must be a Date.
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* @param toAppendTo The result of the formatting operation is appended to
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* this string.
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* @param pos On input: an alignment field, if desired.
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* On output: the offsets of the alignment field.
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* @param status Output param filled with success/failure status.
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* @return The value passed in as toAppendTo (this allows chaining,
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* as with UnicodeString::append())
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*/
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virtual UnicodeString& format(const Formattable& obj,
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UnicodeString& toAppendTo,
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FieldPosition& pos,
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UErrorCode& status) const;
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/**
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* Formats a UDate into a date/time string. This is an abstract method which
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* concrete subclasses must implement.
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* <P>
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* On input, the FieldPosition parameter may have its "field" member filled with
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* an enum value specifying a field. On output, the FieldPosition will be filled
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* in with the text offsets for that field.
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* <P> For example, given a time text
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* "1996.07.10 AD at 15:08:56 PDT", if the given fieldPosition.field is
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* DateFormat::kYearField, the offsets fieldPosition.beginIndex and
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* statfieldPositionus.getEndIndex will be set to 0 and 4, respectively.
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* <P> Notice
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* that if the same time field appears more than once in a pattern, the status will
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* be set for the first occurence of that time field. For instance,
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* formatting a UDate to the time string "1 PM PDT (Pacific Daylight Time)"
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* using the pattern "h a z (zzzz)" and the alignment field
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* DateFormat::TIMEZONE_FIELD, the offsets fieldPosition.beginIndex and
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* fieldPosition.getEndIndex will be set to 5 and 8, respectively, for the first
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* occurence of the timezone pattern character 'z'.
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*
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* @param date a UDate to be formatted into a date/time string.
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* @param toAppendTo the result of the formatting operation is appended to
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* the end of this string.
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* @param fieldPosition On input: an alignment field, if desired (see examples above)
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* On output: the offsets of the alignment field (see examples above)
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* @return A reference to 'toAppendTo'.
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*/
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virtual UnicodeString& format( UDate date,
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UnicodeString& toAppendTo,
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FieldPosition& fieldPosition) const = 0;
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/**
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* Formats a UDate into a date/time string. If there is a problem, you won't
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* know, using this method. Use the overloaded format() method which takes a
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* FieldPosition& to detect formatting problems.
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*
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* @param date The UDate value to be formatted into a string.
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* @param result Output param which will receive the formatted date.
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* @return A reference to 'result'.
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*/
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UnicodeString& format(UDate date, UnicodeString& result) const;
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/**
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* Redeclared Format method.
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*/
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UnicodeString& format(const Formattable& obj,
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UnicodeString& result,
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UErrorCode& status) const;
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/**
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* Parse a date/time string.
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*
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* @param text The string to be parsed into a UDate value.
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* @param status Output param to be set to success/failure code. If
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* 'text' cannot be parsed, it will be set to a failure
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* code.
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* @result The parsed UDate value, if successful.
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*/
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virtual UDate parse( const UnicodeString& text,
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UErrorCode& status) const;
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/**
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* Parse a date/time string beginning at the given parse position. For
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* example, a time text "07/10/96 4:5 PM, PDT" will be parsed into a Date
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* that is equivalent to Date(837039928046).
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* <P>
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* By default, parsing is lenient: If the input is not in the form used by
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* this object's format method but can still be parsed as a date, then the
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* parse succeeds. Clients may insist on strict adherence to the format by
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* calling setLenient(false).
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*
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* @see DateFormat::setLenient(boolean)
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*
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* @param text The date/time string to be parsed
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* @param pos On input, the position at which to start parsing; on
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* output, the position at which parsing terminated, or the
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* start position if the parse failed.
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* @return A valid UDate if the input could be parsed.
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*/
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virtual UDate parse( const UnicodeString& text,
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ParsePosition& pos) const = 0;
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/**
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* Parse a string to produce an object. This methods handles parsing of
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* date/time strings into Formattable objects with UDate types.
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* <P>
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* Before calling, set parse_pos.index to the offset you want to start
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* parsing at in the source. After calling, parse_pos.index is the end of
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* the text you parsed. If error occurs, index is unchanged.
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* <P>
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* When parsing, leading whitespace is discarded (with a successful parse),
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* while trailing whitespace is left as is.
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* <P>
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* See Format::parseObject() for more.
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*
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* @param source The string to be parsed into an object.
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* @param result Formattable to be set to the parse result.
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* If parse fails, return contents are undefined.
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* @param parse_pos The position to start parsing at. Upon return
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* this param is set to the position after the
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* last character successfully parsed. If the
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* source is not parsed successfully, this param
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* will remain unchanged.
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* @return A newly created Formattable* object, or NULL
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* on failure. The caller owns this and should
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* delete it when done.
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*/
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virtual void parseObject(const UnicodeString& source,
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Formattable& result,
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ParsePosition& parse_pos) const;
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/**
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* Create a default date/time formatter that uses the SHORT style for both
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* the date and the time.
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*
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* @return A date/time formatter which the caller owns.
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*/
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static DateFormat* createInstance(void);
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/**
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* Creates a time formatter with the given formatting style for the given
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* locale.
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*
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* @param style The given formatting style. For example,
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* SHORT for "h:mm a" in the US locale.
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* @param aLocale The given locale.
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* @return A time formatter which the caller owns.
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*/
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static DateFormat* createTimeInstance(EStyle style = kDefault,
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const Locale& aLocale = Locale::getDefault());
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/**
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* Creates a date formatter with the given formatting style for the given
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* const locale.
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*
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* @param style The given formatting style. For example,
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* SHORT for "M/d/yy" in the US locale.
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* @param aLocale The given locale.
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* @return A date formatter which the caller owns.
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*/
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static DateFormat* createDateInstance(EStyle style = kDefault,
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const Locale& aLocale = Locale::getDefault());
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/**
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* Creates a date/time formatter with the given formatting styles for the
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* given locale.
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*
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* @param dateStyle The given formatting style for the date portion of the result.
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* For example, SHORT for "M/d/yy" in the US locale.
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* @param timeStyle The given formatting style for the time portion of the result.
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* For example, SHORT for "h:mm a" in the US locale.
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* @param aLocale The given locale.
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* @return A date/time formatter which the caller owns.
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*/
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static DateFormat* createDateTimeInstance(EStyle dateStyle = kDefault,
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EStyle timeStyle = kDefault,
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const Locale& aLocale = Locale::getDefault());
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/**
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* Gets the set of locales for which DateFormats are installed.
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* @param count Filled in with the number of locales in the list that is returned.
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* @return the set of locales for which DateFormats are installed. The caller
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* does NOT own this list and must not delete it.
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*/
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static const Locale* getAvailableLocales(int32_t& count);
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/**
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* Returns true if the formatter is set for lenient parsing.
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*/
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virtual bool_t isLenient(void) const;
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/**
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* Specify whether or not date/time parsing is to be lenient. With lenient
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* parsing, the parser may use heuristics to interpret inputs that do not
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* precisely match this object's format. With strict parsing, inputs must
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* match this object's format.
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* @see Calendar::setLenient
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*/
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virtual void setLenient(bool_t lenient);
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/**
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* Gets the calendar associated with this date/time formatter.
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* @return the calendar associated with this date/time formatter.
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*/
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virtual const Calendar* getCalendar(void) const;
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/**
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* Set the calendar to be used by this date format. Initially, the default
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* calendar for the specified or default locale is used. The caller should
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* not delete the Calendar object after it is adopted by this call.
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*/
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virtual void adoptCalendar(Calendar* calendarToAdopt);
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/**
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* Set the calendar to be used by this date format. Initially, the default
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* calendar for the specified or default locale is used.
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*/
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virtual void setCalendar(const Calendar& newCalendar);
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/**
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* Gets the number formatter which this date/time formatter uses to format
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* and parse the numeric portions of the pattern.
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* @return the number formatter which this date/time formatter uses.
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*/
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virtual const NumberFormat* getNumberFormat(void) const;
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/**
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* Allows you to set the number formatter. The caller should
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* not delete the NumberFormat object after it is adopted by this call.
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* @param formatToAdopt NumberFormat object to be adopted.
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*/
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virtual void adoptNumberFormat(NumberFormat* formatToAdopt);
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/**
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* Allows you to set the number formatter.
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* @param formatToAdopt NumberFormat object to be adopted.
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*/
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virtual void setNumberFormat(const NumberFormat& newNumberFormat);
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/**
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* Returns a reference to the TimeZone used by this DateFormat's calendar.
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* @return the time zone associated with the calendar of DateFormat.
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*/
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virtual const TimeZone& getTimeZone(void) const;
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/**
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* Sets the time zone for the calendar of this DateFormat object. The caller
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* no longer owns the TimeZone object and should not delete it after this call.
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* @param zone the new time zone.
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*/
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virtual void adoptTimeZone(TimeZone* zoneToAdopt);
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/**
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* Sets the time zone for the calendar of this DateFormat object.
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* @param zone the new time zone.
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*/
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virtual void setTimeZone(const TimeZone& zone);
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protected:
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/**
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* Default constructor. Creates a DateFormat with no Calendar or NumberFormat
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* associated with it. This constructor depends on the subclasses to fill in
|
|
* the calendar and numberFormat fields.
|
|
*/
|
|
DateFormat();
|
|
|
|
/**
|
|
* Copy constructor.
|
|
*/
|
|
DateFormat(const DateFormat&);
|
|
|
|
/**
|
|
* Default assignment operator.
|
|
*/
|
|
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.
|
|
*/
|
|
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.
|
|
*/
|
|
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* create(EStyle timeStyle, EStyle dateStyle, const Locale&);
|
|
|
|
/**
|
|
* fgLocales and fgLocalesCount cache the available locales array that is returned
|
|
* by getAvailableLocales().
|
|
*/
|
|
static int32_t fgLocalesCount;
|
|
|
|
/**
|
|
* fgLocales and fgLocalesCount cache the available locales array that is returned
|
|
* by getAvailableLocales().
|
|
*/
|
|
static const Locale* fgLocales;
|
|
};
|
|
|
|
inline UnicodeString&
|
|
DateFormat::format(const Formattable& obj,
|
|
UnicodeString& result,
|
|
UErrorCode& status) const {
|
|
return Format::format(obj, result, status);
|
|
}
|
|
|
|
#endif // _DATEFMT
|
|
//eof
|