760 lines
21 KiB
C++
760 lines
21 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, 1997-1998 *
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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 CALENDAR.CPP
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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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* 02/03/97 clhuang Creation.
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* 04/22/97 aliu Cleaned up, fixed memory leak, made
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* setWeekCountData() more robust.
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* Moved platform code to TPlatformUtilities.
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* 05/01/97 aliu Made equals(), before(), after() arguments const.
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* 05/20/97 aliu Changed logic of when to compute fields and time
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* to fix bugs.
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* 08/12/97 aliu Added equivalentTo. Misc other fixes.
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* 07/28/98 stephen Sync up with JDK 1.2
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* 09/02/98 stephen Sync with JDK 1.2 8/31 build (getActualMin/Max)
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* 03/17/99 stephen Changed adoptTimeZone() - now fAreFieldsSet is
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* set to FALSE to force update of time.
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*******************************************************************************
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*/
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#include "cpputils.h"
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#include "resbund.h"
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#include "gregocal.h"
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// Resource bundle tags read by this class
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const char* Calendar::kDateTimeElements = "DateTimeElements";
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// Data flow in Calendar
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// ---------------------
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// The current time is represented in two ways by Calendar: as UTC
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// milliseconds from the epoch start (1 January 1970 0:00 UTC), and as local
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// fields such as MONTH, HOUR, AM_PM, etc. It is possible to compute the
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// millis from the fields, and vice versa. The data needed to do this
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// conversion is encapsulated by a TimeZone object owned by the Calendar.
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// The data provided by the TimeZone object may also be overridden if the
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// user sets the ZONE_OFFSET and/or DST_OFFSET fields directly. The class
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// keeps track of what information was most recently set by the caller, and
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// uses that to compute any other information as needed.
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// If the user sets the fields using set(), the data flow is as follows.
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// This is implemented by the Calendar subclass's computeTime() method.
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// During this process, certain fields may be ignored. The disambiguation
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// algorithm for resolving which fields to pay attention to is described
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// above.
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// local fields (YEAR, MONTH, DATE, HOUR, MINUTE, etc.)
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// |
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// | Using Calendar-specific algorithm
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// V
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// local standard millis
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// |
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// | Using TimeZone or user-set ZONE_OFFSET / DST_OFFSET
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// V
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// UTC millis (in time data member)
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// If the user sets the UTC millis using setTime(), the data flow is as
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// follows. This is implemented by the Calendar subclass's computeFields()
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// method.
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// UTC millis (in time data member)
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// |
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// | Using TimeZone getOffset()
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// V
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// local standard millis
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// |
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// | Using Calendar-specific algorithm
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// V
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// local fields (YEAR, MONTH, DATE, HOUR, MINUTE, etc.)
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// In general, a round trip from fields, through local and UTC millis, and
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// back out to fields is made when necessary. This is implemented by the
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// complete() method. Resolving a partial set of fields into a UTC millis
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// value allows all remaining fields to be generated from that value. If
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// the Calendar is lenient, the fields are also renormalized to standard
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// ranges when they are regenerated.
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// -------------------------------------
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Calendar::Calendar(UErrorCode& success)
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: fTime(0),
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fIsTimeSet(FALSE),
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fAreFieldsSet(FALSE),
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fAreAllFieldsSet(FALSE),
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fLenient(TRUE),
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fZone(0),
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fNextStamp(kMinimumUserStamp)
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{
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clear();
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fZone = TimeZone::createDefault();
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setWeekCountData(Locale::getDefault(), success);
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}
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// -------------------------------------
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Calendar::Calendar(TimeZone* zone, const Locale& aLocale, UErrorCode& success)
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: fTime(0),
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fIsTimeSet(FALSE),
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fAreFieldsSet(FALSE),
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fAreAllFieldsSet(FALSE),
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fLenient(TRUE),
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fZone(0),
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fNextStamp(kMinimumUserStamp)
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{
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if(zone == 0) {
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success = U_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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clear();
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fZone = zone;
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setWeekCountData(aLocale, success);
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}
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// -------------------------------------
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Calendar::Calendar(const TimeZone& zone, const Locale& aLocale, UErrorCode& success)
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: fTime(0),
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fIsTimeSet(FALSE),
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fAreFieldsSet(FALSE),
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fAreAllFieldsSet(FALSE),
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fLenient(TRUE),
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fZone(0),
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fNextStamp(kMinimumUserStamp)
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{
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clear();
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fZone = zone.clone();
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setWeekCountData(aLocale, success);
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}
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// -------------------------------------
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Calendar::~Calendar()
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{
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delete fZone;
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}
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// -------------------------------------
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Calendar::Calendar(const Calendar &source)
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{
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fZone = 0;
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*this = source;
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}
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// -------------------------------------
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Calendar &
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Calendar::operator=(const Calendar &right)
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{
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if (this != &right)
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{
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icu_arrayCopy(right.fFields, fFields, FIELD_COUNT);
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icu_arrayCopy(right.fIsSet, fIsSet, FIELD_COUNT);
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icu_arrayCopy(right.fStamp, fStamp, FIELD_COUNT);
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fTime = right.fTime;
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fIsTimeSet = right.fIsTimeSet;
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fAreAllFieldsSet = right.fAreAllFieldsSet;
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fAreFieldsSet = right.fAreFieldsSet;
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fLenient = right.fLenient;
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delete fZone;
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fZone = right.fZone->clone();
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fFirstDayOfWeek = right.fFirstDayOfWeek;
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fMinimalDaysInFirstWeek = right.fMinimalDaysInFirstWeek;
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fNextStamp = right.fNextStamp;
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}
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return *this;
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}
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// -------------------------------------
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Calendar*
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Calendar::createInstance(UErrorCode& success)
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{
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if (FAILURE(success)) return 0;
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// right now, createInstance will always return an instance of GregorianCalendar
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Calendar* c = new GregorianCalendar(success);
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if (FAILURE(success)) { delete c; c = 0; }
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return c;
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}
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// -------------------------------------
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Calendar*
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Calendar::createInstance(const TimeZone& zone, UErrorCode& success)
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{
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if (FAILURE(success)) return 0;
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// since the Locale isn't specified, use the default locale
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Calendar* c = new GregorianCalendar(zone, Locale::getDefault(), success);
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if (FAILURE(success)) { delete c; c = 0; }
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return c;
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}
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// -------------------------------------
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Calendar*
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Calendar::createInstance(const Locale& aLocale, UErrorCode& success)
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{
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if (FAILURE(success)) return 0;
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// since the TimeZone isn't specfied, use the default time zone
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Calendar* c = new GregorianCalendar(TimeZone::createDefault(), aLocale, success);
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if (FAILURE(success)) { delete c; c = 0; }
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return c;
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}
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// -------------------------------------
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Calendar*
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Calendar::createInstance(TimeZone* zone, const Locale& aLocale, UErrorCode& success)
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{
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if (FAILURE(success)) {
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delete zone;
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return 0;
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}
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Calendar* c = new GregorianCalendar(zone, aLocale, success);
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if (c == 0) {
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success = U_MEMORY_ALLOCATION_ERROR;
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delete zone;
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} else if (FAILURE(success)) {
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delete c;
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c = 0;
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}
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return c;
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}
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// -------------------------------------
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Calendar*
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Calendar::createInstance(const TimeZone& zone, const Locale& aLocale, UErrorCode& success)
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{
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if (FAILURE(success)) return 0;
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Calendar* c = new GregorianCalendar(zone, aLocale, success);
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if (FAILURE(success)) { delete c; c = 0; }
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return c;
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}
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// -------------------------------------
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bool_t
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Calendar::operator==(const Calendar& that) const
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{
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UErrorCode status = U_ZERO_ERROR;
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// {sfb} is this correct? (Java equals)
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return (getDynamicClassID() == that.getDynamicClassID() &&
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getTimeInMillis(status) == that.getTimeInMillis(status) &&
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fLenient == that.fLenient &&
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fFirstDayOfWeek == that.fFirstDayOfWeek &&
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fMinimalDaysInFirstWeek == that.fMinimalDaysInFirstWeek &&
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*fZone == *(that.fZone));
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// As it stands, this is a very narrowly defined ==, since the
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// Calendars must not only represent the same time; they must
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// also be in exactly the same state. This would be looser if
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// we forced field or fTime computation, and then did the comparison.
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/*
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if (this == &that) return TRUE;
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for (int32_t i=0; i<FIELD_COUNT; ++i)
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{
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if (fFields[i] != that.fFields[i] ||
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fIsSet[i] != that.fIsSet[i]) return FALSE;
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}
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return (getDynamicClassID() == that.getDynamicClassID() &&
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fTime == that.fTime &&
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fIsTimeSet == that.fIsTimeSet &&
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fAreAllFieldsSet == that.fAreAllFieldsSet &&
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fAreFieldsSet == that.fAreFieldsSet &&
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fLenient == that.fLenient &&
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(!fIsSet[ZONE_OFFSET] || (fUserSetZoneOffset == that.fUserSetZoneOffset)) &&
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(!fIsSet[DST_OFFSET] || (fUserSetDSTOffset == that.fUserSetDSTOffset)) &&
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fFirstDayOfWeek == that.fFirstDayOfWeek &&
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fMinimalDaysInFirstWeek == that.fMinimalDaysInFirstWeek &&
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*fZone == *(that.fZone));
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*/
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}
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// -------------------------------------
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bool_t
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Calendar::equals(const Calendar& when, UErrorCode& status) const
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{
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return (this == &when ||
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getTime(status) == when.getTime(status));
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}
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// -------------------------------------
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bool_t
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Calendar::before(const Calendar& when, UErrorCode& status) const
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{
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return (this != &when &&
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getTimeInMillis(status) < when.getTimeInMillis(status));
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}
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// -------------------------------------
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bool_t
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Calendar::after(const Calendar& when, UErrorCode& status) const
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{
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return (this != &when &&
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getTimeInMillis(status) > when.getTimeInMillis(status));
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}
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// {sfb} not in Java API, but looks similar to operator==
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bool_t
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Calendar::equivalentTo(const Calendar& other) const
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{
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// Return true if another Calendar object is equivalent to this one. An equivalent
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// Calendar will behave exactly as this one does (i.e., it will have be the same subclass
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// of Calendar, and have the same time zone, week-count values, and leniency level),
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// but may be set to a different time.
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return getDynamicClassID() == other.getDynamicClassID() &&
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fLenient == other.fLenient &&
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fFirstDayOfWeek == other.fFirstDayOfWeek &&
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fMinimalDaysInFirstWeek == other.fMinimalDaysInFirstWeek &&
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*fZone == *other.fZone;
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}
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// -------------------------------------
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const Locale*
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Calendar::getAvailableLocales(int32_t& count)
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{
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return Locale::getAvailableLocales(count);
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}
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// -------------------------------------
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UDate
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Calendar::getNow()
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{
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return (UDate)icu_getUTCtime() * kMillisPerSecond; // return as milliseconds
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}
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// -------------------------------------
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/**
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* Gets this Calendar's current time as a long.
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* @return the current time as UTC milliseconds from the epoch.
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*/
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double
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Calendar::getTimeInMillis(UErrorCode& status) const
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{
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if(FAILURE(status))
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return 0.0;
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if ( ! fIsTimeSet)
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((Calendar*)this)->updateTime(status);
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return fTime;
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}
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// -------------------------------------
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/**
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* Sets this Calendar's current time from the given long value.
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* @param date the new time in UTC milliseconds from the epoch.
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*/
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void
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Calendar::setTimeInMillis( double millis, UErrorCode& status ) {
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if(FAILURE(status))
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return;
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fIsTimeSet = TRUE;
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fTime = millis;
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fAreFieldsSet = FALSE;
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computeFields(status);
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fAreFieldsSet = TRUE;
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fAreAllFieldsSet = TRUE;
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}
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// -------------------------------------
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int32_t
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Calendar::get(EDateFields field, UErrorCode& status) const
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{
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// field values are only computed when actually requested; for more on when computation
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// of various things happens, see the "data flow in Calendar" description at the top
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// of this file
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if (SUCCESS(status)) ((Calendar*)this)->complete(status); // Cast away const
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return SUCCESS(status) ? fFields[field] : 0;
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}
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// -------------------------------------
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void
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Calendar::set(EDateFields field, int32_t value)
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{
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fIsTimeSet = FALSE;
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fFields[field] = value;
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fStamp[field] = fNextStamp++;
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fAreFieldsSet = FALSE;
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fIsSet[field] = TRUE; // Remove later
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}
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// -------------------------------------
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void
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Calendar::set(int32_t year, int32_t month, int32_t date)
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{
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set(YEAR, year);
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set(MONTH, month);
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set(DATE, date);
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}
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// -------------------------------------
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void
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Calendar::set(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute)
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{
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set(YEAR, year);
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set(MONTH, month);
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set(DATE, date);
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set(HOUR_OF_DAY, hour);
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set(MINUTE, minute);
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}
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// -------------------------------------
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void
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Calendar::set(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, int32_t second)
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{
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set(YEAR, year);
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set(MONTH, month);
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set(DATE, date);
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set(HOUR_OF_DAY, hour);
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set(MINUTE, minute);
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set(SECOND, second);
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}
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// -------------------------------------
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void
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Calendar::clear()
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{
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for (int32_t i=0; i<FIELD_COUNT; ++i) {
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fFields[i] = 0; // Must do this; other code depends on it
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fIsSet[i] = FALSE;
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fStamp[i] = kUnset;
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}
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fAreFieldsSet = FALSE;
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fAreAllFieldsSet = FALSE;
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fIsTimeSet = FALSE;
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}
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// -------------------------------------
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void
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Calendar::clear(EDateFields field)
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{
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fFields[field] = 0;
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fStamp[field] = kUnset;
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fAreFieldsSet = FALSE;
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fAreAllFieldsSet = FALSE;
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fIsSet[field] = FALSE; // Remove later
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fIsTimeSet = FALSE;
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}
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// -------------------------------------
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bool_t
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Calendar::isSet(EDateFields field) const
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{
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return fStamp[field] != kUnset;
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}
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// -------------------------------------
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void
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Calendar::complete(UErrorCode& status)
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{
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if (!fIsTimeSet)
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updateTime(status);
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if (!fAreFieldsSet) {
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computeFields(status); // fills in unset fields
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fAreFieldsSet = TRUE;
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fAreAllFieldsSet = TRUE;
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}
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}
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// -------------------------------------
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void
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Calendar::adoptTimeZone(TimeZone* zone)
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{
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// Do nothing if passed-in zone is NULL
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if (zone == NULL) return;
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// fZone should always be non-null
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if (fZone != NULL) delete fZone;
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fZone = zone;
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// if the zone changes, we need to recompute the time fields
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fAreFieldsSet = FALSE;
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}
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// -------------------------------------
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void
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Calendar::setTimeZone(const TimeZone& zone)
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{
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adoptTimeZone(zone.clone());
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}
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// -------------------------------------
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const TimeZone&
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Calendar::getTimeZone() const
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{
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return *fZone;
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}
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// -------------------------------------
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TimeZone*
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Calendar::orphanTimeZone()
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{
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TimeZone *z = fZone;
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// we let go of the time zone; the new time zone is the system default time zone
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fZone = TimeZone::createDefault();
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return z;
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}
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// -------------------------------------
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void
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Calendar::setLenient(bool_t lenient)
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{
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fLenient = lenient;
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}
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// -------------------------------------
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bool_t
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Calendar::isLenient() const
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{
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return fLenient;
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}
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// -------------------------------------
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void
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Calendar::setFirstDayOfWeek(EDaysOfWeek value)
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{
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fFirstDayOfWeek = value;
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}
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// -------------------------------------
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Calendar::EDaysOfWeek
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Calendar::getFirstDayOfWeek() const
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{
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return fFirstDayOfWeek;
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}
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// -------------------------------------
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void
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Calendar::setMinimalDaysInFirstWeek(uint8_t value)
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{
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fMinimalDaysInFirstWeek = value;
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}
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// -------------------------------------
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uint8_t
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|
Calendar::getMinimalDaysInFirstWeek() const
|
|
{
|
|
return fMinimalDaysInFirstWeek;
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
int32_t
|
|
Calendar::getActualMinimum(EDateFields field, UErrorCode& status) const
|
|
{
|
|
int32_t fieldValue = getGreatestMinimum(field);
|
|
int32_t endValue = getMinimum(field);
|
|
|
|
// if we know that the minimum value is always the same, just return it
|
|
if (fieldValue == endValue) {
|
|
return fieldValue;
|
|
}
|
|
|
|
// clone the calendar so we don't mess with the real one, and set it to
|
|
// accept anything for the field values
|
|
Calendar *work = (Calendar*)this->clone();
|
|
work->setLenient(TRUE);
|
|
|
|
// now try each value from getLeastMaximum() to getMaximum() one by one until
|
|
// we get a value that normalizes to another value. The last value that
|
|
// normalizes to itself is the actual minimum for the current date
|
|
int32_t result = fieldValue;
|
|
|
|
do {
|
|
work->set(field, fieldValue);
|
|
if (work->get(field, status) != fieldValue) {
|
|
break;
|
|
}
|
|
else {
|
|
result = fieldValue;
|
|
fieldValue--;
|
|
}
|
|
} while (fieldValue >= endValue);
|
|
|
|
delete work;
|
|
return result;
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
int32_t
|
|
Calendar::getActualMaximum(EDateFields field, UErrorCode& status) const
|
|
{
|
|
int32_t fieldValue = getLeastMaximum(field);
|
|
int32_t endValue = getMaximum(field);
|
|
|
|
// if we know that the maximum value is always the same, just return it
|
|
if (fieldValue == endValue) {
|
|
return fieldValue;
|
|
}
|
|
|
|
// clone the calendar so we don't mess with the real one, and set it to
|
|
// accept anything for the field values
|
|
Calendar *work = (Calendar*)this->clone();
|
|
work->setLenient(TRUE);
|
|
|
|
// if we're counting weeks, set the day of the week to Sunday. We know the
|
|
// last week of a month or year will contain the first day of the week.
|
|
if (field == WEEK_OF_YEAR || field == WEEK_OF_MONTH)
|
|
work->set(DAY_OF_WEEK, fFirstDayOfWeek);
|
|
|
|
// now try each value from getLeastMaximum() to getMaximum() one by one until
|
|
// we get a value that normalizes to another value. The last value that
|
|
// normalizes to itself is the actual maximum for the current date
|
|
int32_t result = fieldValue;
|
|
|
|
do {
|
|
work->set(field, fieldValue);
|
|
if(work->get(field, status) != fieldValue) {
|
|
break;
|
|
}
|
|
else {
|
|
result = fieldValue;
|
|
fieldValue++;
|
|
}
|
|
} while (fieldValue <= endValue);
|
|
|
|
delete work;
|
|
return result;
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
int32_t Calendar::stringToDayNumber(const UnicodeString& string, UErrorCode& status)
|
|
{
|
|
// Convert a UnicodeString to a long integer, using the standard C library.
|
|
// Return both the value obtained, and a UErrorCode indicating success or failure.
|
|
// We fail if the string is zero length, of if strtol() does not parse all
|
|
// of the characters in the string, or if the value is not in the range
|
|
// 1..7. (This is used to read the week-count data from the resource files;
|
|
// ResourceBundle returns all data in string form, so we have to convert it here.)
|
|
if (FAILURE(status)) return 0;
|
|
|
|
int32_t len = string.size();
|
|
char *number = new char[1 + len];
|
|
if (number == 0) { status = U_MEMORY_ALLOCATION_ERROR; return 0; }
|
|
char *end;
|
|
|
|
string.extract(0, len, number);
|
|
number[len] = 0;
|
|
int32_t value = strtol(number, &end, 10); // Radix 10
|
|
|
|
delete[] number;
|
|
|
|
if (end-number != len || len == 0 || value < 1 || value > 7)
|
|
status = U_INVALID_FORMAT_ERROR;
|
|
|
|
return value;
|
|
}
|
|
|
|
// -------------------------------------
|
|
|
|
void
|
|
Calendar::setWeekCountData(const Locale& desiredLocale, UErrorCode& status)
|
|
{
|
|
// Read the week count data from the resource bundle. This should
|
|
// have the form:
|
|
//
|
|
// DateTimeElements {
|
|
// "1", // first day of week
|
|
// "1" // min days in week
|
|
// }
|
|
|
|
const UnicodeString *dateTimeElements;
|
|
int32_t count;
|
|
|
|
if (FAILURE(status)) return;
|
|
ResourceBundle resource(Locale::getDataDirectory(), desiredLocale, status);
|
|
|
|
// If the resource data doesn't seem to be present at all, then use last-resort
|
|
// hard-coded data.
|
|
if (FAILURE(status))
|
|
{
|
|
status = U_USING_FALLBACK_ERROR;
|
|
fFirstDayOfWeek = Calendar::SUNDAY;
|
|
fMinimalDaysInFirstWeek = 1;
|
|
return;
|
|
}
|
|
|
|
dateTimeElements = resource.getStringArray(kDateTimeElements, count, status);
|
|
if (FAILURE(status)) return;
|
|
if (count != 2)
|
|
{
|
|
status = U_INVALID_FORMAT_ERROR;
|
|
return;
|
|
}
|
|
|
|
fFirstDayOfWeek = (Calendar::EDaysOfWeek)stringToDayNumber(dateTimeElements[0], status);
|
|
fMinimalDaysInFirstWeek = (uint8_t)stringToDayNumber(dateTimeElements[1], status);
|
|
}
|
|
|
|
/**
|
|
* Recompute the time and update the status fields isTimeSet
|
|
* and areFieldsSet. Callers should check isTimeSet and only
|
|
* call this method if isTimeSet is false.
|
|
*/
|
|
void
|
|
Calendar::updateTime(UErrorCode& status)
|
|
{
|
|
computeTime(status);
|
|
if(FAILURE(status))
|
|
return;
|
|
|
|
// If we are lenient, we need to recompute the fields to normalize
|
|
// the values. Also, if we haven't set all the fields yet (i.e.,
|
|
// in a newly-created object), we need to fill in the fields. [LIU]
|
|
if (isLenient() || ! fAreAllFieldsSet)
|
|
fAreFieldsSet = FALSE;
|
|
|
|
fIsTimeSet = TRUE;
|
|
}
|
|
|
|
//eof
|