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| -rw-r--r-- | include/tools/date.hxx | 259 |
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diff --git a/include/tools/date.hxx b/include/tools/date.hxx new file mode 100644 index 000000000..6179d637e --- /dev/null +++ b/include/tools/date.hxx @@ -0,0 +1,259 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ +#ifndef INCLUDED_TOOLS_DATE_HXX +#define INCLUDED_TOOLS_DATE_HXX + +#include <tools/toolsdllapi.h> + +#include <ostream> + +#include <com/sun/star/util/Date.hpp> + +namespace com::sun::star::util { struct DateTime; } + +enum DayOfWeek { MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, + SATURDAY, SUNDAY }; + +/** Represents a date in the proleptic Gregorian calendar. + + Largest representable date is 32767-12-31 = 327671231 + + Smallest representable date is -32768-01-01 = -327680101 + + Due to possible conversions to css::util::Date, which has a short + Year member variable, these limits are fix. + + Year value 0 is unused. The year before year 1 CE is year 1 BCE, which is + the traditional proleptic Gregorian calendar. + + This is not how ISO 8601:2000 defines things (but ISO 8601:1998 Draft + Revision did), but it enables class Date to be used for writing XML files + as XML Schema Part 2 in D.3.2 No Year Zero says + "The year "0000" is an illegal year value.", see + https://www.w3.org/TR/2004/REC-xmlschema-2-20041028/#noYearZero + and furthermore the note for 3.2.7 dateTime + https://www.w3.org/TR/2004/REC-xmlschema-2-20041028/#dateTime + + */ +class SAL_WARN_UNUSED TOOLS_DLLPUBLIC Date +{ +private: + sal_Int32 mnDate; + void setDateFromDMY( sal_uInt16 nDay, sal_uInt16 nMonth, sal_Int16 nYear ); + +public: + enum DateInitSystem + { + SYSTEM + }; + + enum DateInitEmpty + { + EMPTY + }; + + explicit Date( DateInitEmpty ) : mnDate(0) {} + explicit Date( DateInitSystem ); + explicit Date( sal_Int32 nDate ) : mnDate(nDate) {} + Date( const Date& rDate ) : mnDate(rDate.mnDate) {} + + /** nDay and nMonth both must be <100, nYear must be != 0 */ + Date( sal_uInt16 nDay, sal_uInt16 nMonth, sal_Int16 nYear ) + { setDateFromDMY(nDay, nMonth, nYear); } + + Date( const css::util::Date& rUDate ) + { + setDateFromDMY(rUDate.Day, rUDate.Month, rUDate.Year); + } + Date( const css::util::DateTime& _rDateTime ); + + bool IsEmpty() const { return mnDate == 0; } + + void SetDate( sal_Int32 nNewDate ); + sal_Int32 GetDate() const { return mnDate; } + /** Type safe access for values that are guaranteed to be unsigned, like Date::SYSTEM. */ + sal_uInt32 GetDateUnsigned() const { return static_cast<sal_uInt32>(mnDate < 0 ? -mnDate : mnDate); } + css::util::Date GetUNODate() const { return css::util::Date(GetDay(), GetMonth(), GetYear()); } + + /** nNewDay must be <100 */ + void SetDay( sal_uInt16 nNewDay ); + /** nNewMonth must be <100 */ + void SetMonth( sal_uInt16 nNewMonth ); + /** nNewYear must be != 0 */ + void SetYear( sal_Int16 nNewYear ); + + sal_uInt16 GetDay() const + { + return mnDate < 0 ? + static_cast<sal_uInt16>(-mnDate % 100) : + static_cast<sal_uInt16>( mnDate % 100); + } + sal_uInt16 GetMonth() const + { + return mnDate < 0 ? + static_cast<sal_uInt16>((-mnDate / 100) % 100) : + static_cast<sal_uInt16>(( mnDate / 100) % 100); + } + sal_Int16 GetYear() const { return static_cast<sal_Int16>(mnDate / 10000); } + /** Type safe access for values that are guaranteed to be unsigned, like Date::SYSTEM. */ + sal_uInt16 GetYearUnsigned() const { return static_cast<sal_uInt16>((mnDate < 0 ? -mnDate : mnDate) / 10000); } + sal_Int16 GetNextYear() const { sal_Int16 nY = GetYear(); return nY == -1 ? 1 : nY + 1; } + sal_Int16 GetPrevYear() const { sal_Int16 nY = GetYear(); return nY == 1 ? -1 : nY - 1; } + + /** Add years skipping year 0 and truncating at limits. If the original + date was on Feb-29 and the resulting date is not a leap year, the + result is adjusted to Feb-28. + */ + void AddYears( sal_Int16 nAddYears ); + + /** Add months skipping year 0 and truncating at limits. If the original + date was on Feb-29 or day 31 and the resulting date is not a leap year + or a month with fewer days, the result is adjusted to Feb-28 or day 30. + */ + void AddMonths( sal_Int32 nAddMonths ); + + /** Add days skipping year 0 and truncating at limits. + */ + void AddDays( sal_Int32 nAddDays ); + + /** Obtain the day of the week for the date. + + Internally normalizes a copy of values. + The result may be unexpected for a non-normalized invalid date like + Date(31,11,2000) or a sequence of aDate.SetDay(31); aDate.SetMonth(11); + */ + DayOfWeek GetDayOfWeek() const; + + /** Obtain the day of the year for the date. + + Internally normalizes a copy of values. + The result may be unexpected for a non-normalized invalid date like + Date(31,11,2000) or a sequence of aDate.SetDay(31); aDate.SetMonth(11); + */ + sal_uInt16 GetDayOfYear() const; + + /** Obtain the week of the year for a date. + + @param nMinimumNumberOfDaysInWeek + How many days of a week must reside in the first week of a year. + + Internally normalizes a copy of values. + The result may be unexpected for a non-normalized invalid date like + Date(31,11,2000) or a sequence of aDate.SetDay(31); aDate.SetMonth(11); + */ + sal_uInt16 GetWeekOfYear( DayOfWeek eStartDay = MONDAY, + sal_Int16 nMinimumNumberOfDaysInWeek = 4 ) const; + + /** Obtain the number of days in the month of the year of the date. + + Internally normalizes a copy of values. + + The result may be unexpected for a non-normalized invalid date like + Date(31,11,2000) or a sequence of aDate.SetDay(31); aDate.SetMonth(11); + + These would result in 31 as --11-31 rolls over to --12-01 and the + number of days in December is returned. + + Instead, to obtain the value for the actual set use the static method + Date::GetDaysInMonth( aDate.GetMonth(), aDate.GetYear()) in such cases. + */ + sal_uInt16 GetDaysInMonth() const; + + sal_uInt16 GetDaysInYear() const { return (IsLeapYear()) ? 366 : 365; } + bool IsLeapYear() const; + + /** If the represented date is valid (1<=month<=12, 1<=day<=(28,29,30,31) + depending on month/year) AND is of the Gregorian calendar (1582-10-15 + <= date) + */ + bool IsValidAndGregorian() const; + + /** If the represented date is valid (1<=month<=12, 1<=day<=(28,29,30,31) + depending on month/year) */ + bool IsValidDate() const; + + // Returns true, if the date is the end of the month, false otherwise. + bool IsEndOfMonth() const; + + /** Normalize date, invalid day or month values are adapted such that they + carry over to the next month or/and year, for example 1999-02-32 + becomes 1999-03-04, 1999-13-01 becomes 2000-01-01, 1999-13-42 becomes + 2000-02-11. Truncates at -32768-01-01 or 32767-12-31, 0001-00-x will + yield the normalized value of -0001-12-x + + This may be necessary after Date ctors or if the SetDate(), SetDay(), + SetMonth(), SetYear() methods set individual non-matching values. + Adding/subtracting to/from dates never produces invalid dates. + */ + void Normalize(); + + bool IsBetween( const Date& rFrom, const Date& rTo ) const + { return ((mnDate >= rFrom.mnDate) && + (mnDate <= rTo.mnDate)); } + + bool operator ==( const Date& rDate ) const + { return (mnDate == rDate.mnDate); } + bool operator !=( const Date& rDate ) const + { return (mnDate != rDate.mnDate); } + bool operator >( const Date& rDate ) const + { return (mnDate > rDate.mnDate); } + bool operator <( const Date& rDate ) const + { return (mnDate < rDate.mnDate); } + bool operator >=( const Date& rDate ) const + { return (mnDate >= rDate.mnDate); } + bool operator <=( const Date& rDate ) const + { return (mnDate <= rDate.mnDate); } + + Date& operator =( const Date& rDate ) + { mnDate = rDate.mnDate; return *this; } + Date& operator =( const css::util::Date& rUDate ) + { setDateFromDMY( rUDate.Day, rUDate.Month, rUDate.Year); return *this; } + Date& operator ++(); + Date& operator --(); + + TOOLS_DLLPUBLIC friend Date operator +( const Date& rDate, sal_Int32 nDays ); + TOOLS_DLLPUBLIC friend Date operator -( const Date& rDate, sal_Int32 nDays ); + TOOLS_DLLPUBLIC friend sal_Int32 operator -( const Date& rDate1, const Date& rDate2 ); + + /** Obtain number of days in a month of a year. + + Internally sanitizes nMonth to values 1 <= nMonth <= 12, does not + normalize values. + */ + static sal_uInt16 GetDaysInMonth( sal_uInt16 nMonth, sal_Int16 nYear ); + + /// Internally normalizes values. + static sal_Int32 DateToDays( sal_uInt16 nDay, sal_uInt16 nMonth, sal_Int16 nYear ); + /// Semantically identical to IsValidDate() member method. + static bool IsValidDate( sal_uInt16 nDay, sal_uInt16 nMonth, sal_Int16 nYear ); + /// Semantically identical to IsEndOfMonth() member method. + static bool IsEndOfMonth(sal_uInt16 nDay, sal_uInt16 nMonth, sal_Int16 nYear); + /// Semantically identical to Normalize() member method. + static bool Normalize( sal_uInt16 & rDay, sal_uInt16 & rMonth, sal_Int16 & rYear ); + + private: + /// An accelerated form of DateToDays on this date + sal_Int32 GetAsNormalizedDays() const; +}; + +TOOLS_DLLPUBLIC std::ostream& operator<<(std::ostream& os, const Date& rDate); + +#endif + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |