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- //=============================================================================
- // File: datetime.h
- // Contents: Declarations for DwDateTime
- // Maintainer: Doug Sauder <dwsauder@fwb.gulf.net>
- // WWW: http://www.fwb.gulf.net/~dwsauder/mimepp.html
- //
- // Copyright (c) 1996, 1997 Douglas W. Sauder
- // All rights reserved.
- //
- // IN NO EVENT SHALL DOUGLAS W. SAUDER BE LIABLE TO ANY PARTY FOR DIRECT,
- // INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
- // THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF DOUGLAS W. SAUDER
- // HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- //
- // DOUGLAS W. SAUDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT
- // NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
- // PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
- // BASIS, AND DOUGLAS W. SAUDER HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
- // SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
- //
- //=============================================================================
-
- #ifndef DW_DATETIME_H
- #define DW_DATETIME_H
-
- #include <time.h>
-
- #ifndef DW_CONFIG_H
- #include <mimelib/config.h>
- #endif
-
- #ifndef DW_FIELDBDY_H
- #include <mimelib/fieldbdy.h>
- #endif
-
- //=============================================================================
- //+ Name DwDateTime -- Class representing an RFC-822 date-time
- //+ Description
- //. {\tt DwDatetime} represents a {\it date-time} as described in RFC-822
- //. and RFC-1123. The parse method for {\tt DwDateTime} parses the
- //. string representation to extract the year, month, day, hour, minute,
- //. second, and time zone. {\tt DwDateTime} provides member functions
- //. to set or get the individual components of the date-time.
- //=============================================================================
- // Last modified 1997-08-23
- //+ Noentry ~DwDateTime mYear mMonth mDay mHour mMinute mSecond mZone
- //+ Noentry sDefaultZone sIsDefaultZoneSet _PrintDebugInfo
-
-
- class DW_EXPORT DwDateTime : public DwFieldBody {
-
- public:
-
- DwDateTime();
- DwDateTime(const DwDateTime& aDateTime);
- DwDateTime(const DwString& aStr, DwMessageComponent* aParent=0);
- //. The first constructor is the default constructor, which assigns
- //. the current date and time as reported by the operating system.
- //.
- //. The second constructor is the copy constructor. The parent of
- //. the new {\tt DwDateTime} object is set to {\tt NULL}.
- //.
- //. The third constructor sets {\tt aStr} as the {\tt DwDateTime}
- //. object's string representation and sets {\tt aParent} as its parent.
- //. The virtual member function {\tt Parse()} should be called after
- //. this constructor to extract the date and time information from the
- //. string representation. Unless it is {\tt NULL}, {\tt aParent} should
- //. point to an object of a class derived from {\tt DwField}.
-
- virtual ~DwDateTime();
-
- const DwDateTime& operator = (const DwDateTime& aDateTime);
- //. This is the assignment operator, which sets this {\tt DwDateTime}
- //. object to the same value as {\tt aDateTime}.
-
- virtual void Parse();
- //. This virtual function, inherited from {\tt DwMessageComponent},
- //. executes the parse method for {\tt DwDateTime} objects. The parse
- //. method creates or updates the broken-down representation from the
- //. string representation. For {\tt DwDateTime} objects, the parse
- //. method parses the string representation to extract the year,
- //. month, day, hour, minute, second, and time zone.
- //.
- //. This function clears the is-modified flag.
-
- virtual void Assemble();
- //. This virtual function, inherited from {\tt DwMessageComponent},
- //. executes the assemble method for {\tt DwDateTime} objects.
- //. It should be called whenever one of the object's attributes
- //. is changed in order to assemble the string representation from
- //. its broken-down representation. It will be called
- //. automatically for this object by the parent object's
- //. {\tt Assemble()} member function if the is-modified flag is set.
- //.
- //. This function clears the is-modified flag.
-
- virtual DwMessageComponent* Clone() const;
- //. This virtual function, inherited from {\tt DwMessageComponent},
- //. creates a new {\tt DwDateTime} on the free store that has the same
- //. value as this {\tt DwDateTime} object. The basic idea is that of
- //. a virtual copy constructor.
-
- DwUint32 AsUnixTime() const;
- //. Returns the date and time as a UNIX (POSIX) time, defined as the
- //. number of seconds elapsed since 1 Jan 1970 00:00:00 UTC.
-
- void FromUnixTime(DwUint32 aTime);
- //. Sets the date and time from {\tt aTime}, interpreted as the number of
- //. of seconds elapsed since 1 Jan 1970 00:00:00 UTC.
-
- void FromCalendarTime(time_t aTime);
- //. Sets the date and time from {\tt aTime}, which is assumed to be in a
- //. format compatible with the native {\tt time()} ANSI C function.
- //. For most UNIX systems, this function is the same as the function
- //. {\tt FromUnixTime()}. (For efficiency, use {\tt FromUnixTime()}
- //. instead of {\tt FromCalendarTime()} if possible).
-
- DwInt32 DateAsJulianDayNum() const;
- //. Returns the Julian Day Number, defined as the number of days elapsed
- //. since 1 Jan 4713 BC. The JDN is calculated directly from the values
- //. of the year, month, and day; time zone information is ignored.
-
- void DateFromJulianDayNum(DwInt32 aJdn);
- //. Sets the year, month, and day from {\tt aJdn}, interpreted as a Julian
- //. Day Number. By definition, the JDN is the number of days elapsed
- //. since 1 Jan 4713 BC. This member function ignores time zone
- //. information.
-
- DwInt32 TimeAsSecsPastMidnight() const;
- //. Returns the number of seconds past midnight. The value is
- //. calculated directly from the values of the hour, minute, and
- //. second; time zone information is ignored.
-
- void TimeFromSecsPastMidnight(DwInt32 aSecs);
- //. Sets the hour, minute, and second from {\tt aSecs}, interpreted as the
- //. number of seconds elapsed since midnight. This member function
- //. ignores time zone information. The argument {\tt aSecs} should be in
- //. the range 0 to 86399, inclusive.
-
- int Year() const;
- //. Returns the four digit year, e.g. 1997.
-
- void SetYear(int aYear);
- //. Sets the year from {\tt aYear}, which should be a four digit year.
-
- int Month() const;
- //. Returns the month. Values range from 1 to 12.
-
- void SetMonth(int aMonth);
- //. Sets the month from {\tt aMonth}, which should be in the range 1
- //. to 12.
-
- int Day() const;
- //. Returns the day of the month. Values range from 1 to 31.
-
- void SetDay(int aDay);
- //. Sets the day of the month from {\tt aDay}.
-
- int Hour() const;
- //. Returns the hour according to the 24 hour clock.
- //. Values range from 0 to 23.
-
- void SetHour(int aHour);
- //. Sets the hour from {\tt aHour} based on the 24-hour clock. {\tt aHour}
- //. should be in the range 0 to 23.
-
- int Minute() const;
- //. Returns the minute. Values range from 0 to 59.
-
- void SetMinute(int aMinute);
- //. Sets the minute from {\tt aMinute}, which should be in the range 0
- //. to 59.
-
- int Second() const;
- //. Returns the second. Values range from 0 to 59.
-
- void SetSecond(int aSecond);
- //. Sets the second from {\tt aSecond}, which should be in the range 0
- //. to 59.
-
- int Zone() const;
- //. Returns the time zone as the diffence in minutes between local time
- //. and Coordinated Universal Time (UTC or GMT).
-
- void SetZone(int aZone);
- //. Sets the time zone from {\tt aZone}, interpreted as the time difference
- //. in minutes between local time and Coordinated Universal Time
- //. (UTC, or GMT).
-
- static void SetDefaultZone(int aZone);
- //. Sets the default time zone. {\tt aZone} should be the time difference
- //. in minutes between local time and Coordinated Universal Time
- //. (UTC, or GMT). The value is used to set the time zone for any
- //. objects created using the default constructor.
-
- static DwDateTime* NewDateTime(const DwString&, DwMessageComponent*);
- //. Creates a new {\tt DwDateTime} object on the free store.
- //. If the static data member {\tt sNewDateTime} is {\tt NULL},
- //. this member function will create a new {\tt DwDateTime}
- //. and return it. Otherwise, {\tt NewDateTime()} will call
- //. the user-supplied function pointed to by {\tt sNewDateTime},
- //. which is assumed to return an object from a class derived from
- //. {\tt DwDateTime}, and return that object.
-
- //+ Var sNewDateTime
- static DwDateTime* (*sNewDateTime)(const DwString&, DwMessageComponent*);
- //. If {\tt sNewDateTime} is not {\tt NULL}, it is assumed to point to a
- //. user-supplied function that returns an object from a class derived
- //. from {\tt DwDateTime}.
-
- protected:
-
- void _FromUnixTime(DwUint32 aTime);
- //. Like {\tt FromUnixTime()}, but doesn't set the is-modified flag.
-
- void _FromCalendarTime(time_t aTime);
- //. Like {\tt FromCalendarTime()}, but doesn't set the is-modified flag.
-
- int mYear;
- int mMonth;
- int mDay;
- int mHour;
- int mMinute;
- int mSecond;
- int mZone;
-
- static int sDefaultZone;
- static int sIsDefaultZoneSet;
-
- private:
-
- static const char* const sClassName;
-
- void Init();
- //. Initialization code common to all constructors.
-
- public:
-
- virtual void PrintDebugInfo(std::ostream& aStrm, int aDepth=0) const;
- //. This virtual function, inherited from {\tt DwMessageComponent},
- //. prints debugging information about this object to {\tt aStrm}.
- //.
- //. This member function is available only in the debug version of
- //. the library.
-
- virtual void CheckInvariants() const;
- //. Aborts if one of the invariants of the object fails. Use this
- //. member function to track down bugs.
- //.
- //. This member function is available only in the debug version of
- //. the library.
-
- protected:
-
- void _PrintDebugInfo(std::ostream& aStrm) const;
-
- };
-
-
- inline int DwDateTime::Year() const
- {
- return mYear;
- }
-
-
- inline int DwDateTime::Month() const
- {
- return mMonth;
- }
-
-
- inline int DwDateTime::Day() const
- {
- return mDay;
- }
-
-
- inline int DwDateTime::Hour() const
- {
- return mHour;
- }
-
-
- inline int DwDateTime::Minute() const
- {
- return mMinute;
- }
-
-
- inline int DwDateTime::Second() const
- {
- return mSecond;
- }
-
-
- inline int DwDateTime::Zone() const
- {
- return mZone;
- }
-
-
- inline void DwDateTime::SetYear(int aYear)
- {
- mYear = aYear;
- SetModified();
- }
-
-
- inline void DwDateTime::SetMonth(int aMonth)
- {
- mMonth = aMonth;
- SetModified();
- }
-
-
- inline void DwDateTime::SetDay(int aDay)
- {
- mDay = aDay;
- SetModified();
- }
-
-
- inline void DwDateTime::SetHour(int aHour)
- {
- mHour = aHour;
- SetModified();
- }
-
-
- inline void DwDateTime::SetMinute(int aMinute)
- {
- mMinute = aMinute;
- SetModified();
- }
-
-
- inline void DwDateTime::SetSecond(int aSecond)
- {
- mSecond = aSecond;
- SetModified();
- }
-
-
- inline void DwDateTime::SetZone(int aZone)
- {
- mZone = aZone;
- SetModified();
- }
-
- #endif
-