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Datei: SBCalendar.vdmpp Sprache: VDM

Original von: VDM^©

\section{SBCalendar}
\subsection{Responsibility}
I'm a calendar of Japanese borkerage firm.

\subsection{Abstract}
I consider day off of company, country.

\begin{vdm_al}
class SBCalendar is subclass of JapaneseCalendar -- date

values
io = new IO();
calendar = new SBCalendar();

instance variables

public iTodayOnBusiness : [Date] := nil; -- This value express today for test.
public iTodayOnCompanyMap : [map seq of char to Date] := { |-> };  -- a map of companyCode to todayOnBusiness
public timeOfSystem : [Time] := nil; -- This value express now for test.

functions

static public isCorrectContractMonth: seq of char -> bool
isCorrectContractMonth(aContractMonth) ==
calendar.getDateFromString(aContractMonth ^ "01") <> false;

static public getExerciseDate :  seq of char -> Date
getExerciseDate(aContractMonth) ==
let firstDayOfContractMonth = calendar.getDateFromString(aContractMonth ^ "01"),
  designatedYear = firstDayOfContractMonth.Year(),
  designatedMonth =firstDayOfContractMonth.Month() in
calendar.getNthDayOfTheWeek(designatedYear,designatedMonth,2,<Fri>).getPastWeekday()
pre
isCorrectContractMonth(aContractMonth);
\end{vdm_al}

\subsubsection{getContractDate}
信用取引の決済日（期日）を得る。
弁済期限とは、信用建玉に対して当社がお客様に信用を供与する期限をいいます。弁済期限は、現在のところ6ヶ月のみを取扱っています。
弁済期限が6ヶ月であるということは、信用建玉の建日（信用建玉が約定した日）の6ヶ月目応当日が信用期日となり、この日を超えて建玉を保有することは法律で禁じられています。信用期日が休日の場合には、直近の前営業日が信用期日となります。

この日本語仕様だと、以下の問題があります。
\begin{enumerate}
\item 応答日の定義がない。
\item たとえば信用建玉の建日が８月３１日だと、応当日は翌年２月３１日になってしまうのだが、そのとき２月２９日にするのか３月１日にするのかの記述がない。
\item 応当日からfirstDayOfMonthまですべて休日の場合、前月の営業日にしてよいのかどうかの記述がない。
\item 信用取引の決済日（信用期日）と弁済期限が同じものを指しているが、明確な定義がない。
\end{enumerate}

\begin{vdm_al}
static public getContractDate : Date -> Date
getContractDate(aDate) ==
let
  mk_(year, month) = calendar.getMonthOf6monthsLater(aDate.Year(), aDate.Month()),
  date = aDate.day(),
  candidateDate = getCandidateDate(year, month, date)
in
candidateDate.getPastWeekday() --Sometime the result is a date of previous month.
--pre
--aDate.isNotDayOff()
post
let
  mk_(year, month) = calendar.getMonthOf6monthsLater(aDate.Year(), aDate.Month()),
  date = aDate.day(),
  candidateDate = getCandidateDate(year, month, date)
in
RESULT.EQ(candidateDate.getPastWeekday()) and
if isDayoffFromTheBeginingOfMonthToCandidateDate(candidateDate) then
  RESULT.Month() = getPreviousMonth(year, month)
else
  RESULT.Month() = month;

static public getMonthOf6monthsLater :  int * int ->  int * int
getMonthOf6monthsLater(year, month) == calendar.getRegularMonth(year, month+6);

static public getCandidateDate : int * int * int -> Date
getCandidateDate(year, month, date)  ==
  let dateOfEndOfMonth = calendar.getLastDayOfMonth(year, month)
  in
   if dateOfEndOfMonth.day() < date then
    dateOfEndOfMonth
   else
    calendar.getDateFrom_yyyy_mm_dd(year, month, date);

static public isDayoffFromTheBeginingOfMonthToCandidateDate : Date -> bool
isDayoffFromTheBeginingOfMonthToCandidateDate(candidateDate) ==
forall day in set {1, ..., candidateDate.day()} &
  calendar.isSundayOrDayoff(calendar.getDateFrom_yyyy_mm_dd(candidateDate.Year(), candidateDate.Month(), day));

static public getPreviousMonth : int * int -> int
getPreviousMonth(year, month) ==
  let mk_(-, previousMonth) = calendar.getRegularMonth(year, month-1)
  in
  previousMonth;

static public isDateNil: [Date] -> bool
isDateNil(date) ==  date = nil; --or date = maxDate();

static public systemDate : () -> Date
systemDate() == calendar.today();

operations
public setTheSetOfDayOffs: int ==> ()  -- get the set of dayoff, but Sundays are not in set
setTheSetOfDayOffs(year) ==
let japaneseCalendar = new JapaneseCalendar(),
  japaneseDayoffSet = japaneseCalendar.getSetOfDayOff(year),
  TR1のsetOfDayOff = {
   japaneseCalendar.getDateFrom_yyyy_mm_dd(year,1,2),
   japaneseCalendar.getDateFrom_yyyy_mm_dd(year,1,3),
   japaneseCalendar.getDateFrom_yyyy_mm_dd(year,12,29),
   japaneseCalendar.getDateFrom_yyyy_mm_dd(year,12,30),
   japaneseCalendar.getDateFrom_yyyy_mm_dd(year,12,31)
  },
  saturdaySet = japaneseCalendar.getDayOfTheWeekInYear(year,<Sat>)  in
Year2Holidays := Year2Holidays munion { year |-> japaneseDayoffSet union TR1のsetOfDayOff union saturdaySet}
pre
year >= 2000;

--todayOnBusinessをreadFromFile
public readTodayOnBusiness : seq of char ==> [Date]
readTodayOnBusiness(fname) ==
let mk_(rslt, mk_(y,m,d)) = io.freadval[int * int * int](fname)
in
if rslt then
  return getDateFrom_yyyy_mm_dd(y,m,d)
else
  let - = io.echo("Can't read BaseDay's data file.")
  in
  return nil;

--get today for test
public todayOnBusiness: () ==> Date
todayOnBusiness() ==
if iTodayOnBusiness = nil then
  return readTodayOnBusiness(homedir ^ "/temp/BaseDay.txt")
else
  return iTodayOnBusiness;

public readFromFiletodayOnBusiness: seq of char ==> Date
readFromFiletodayOnBusiness(fname) ==
if iTodayOnBusiness = nil then
  return readTodayOnBusiness(fname)
else
  return iTodayOnBusiness;

public setTodayOnBusiness : Date ==> ()
setTodayOnBusiness(date) == iTodayOnBusiness := date;

-- get today for system. For example, many business systems thinks just after midnight is as "today"
public todayOnCompany: seq of char ==> Date
todayOnCompany(companyCode) ==
(
if iTodayOnCompanyMap = nil then
  setTodayOnCompany(companyCode,todayOnBusiness());
return iTodayOnCompanyMap(companyCode)
);

public setTodayOnCompany : seq of char * Date ==> ()
setTodayOnCompany(companyCode,date) == iTodayOnCompanyMap := iTodayOnCompanyMap ++ { companyCode |-> date };

public readSystemTime : () ==> [Time]
readSystemTime() ==
let mk_(rslt, now) = io.freadval[Time](homedir ^ "/temp/SystemTime.txt")
in
if rslt then
  return now
else
  let - = io.echo("Can't read System Time data file.")
  in
  return nil;

public systemTime : () ==> Time
systemTime() ==
if timeOfSystem = nil then
  readSystemTime()
else
  return timeOfSystem;

public setSystemTime : Time ==> ()
setSystemTime(t) ==  timeOfSystem := t;

public SBCalendar : () ==> SBCalendar
SBCalendar() ==
(
setDifferenceWithGMT(differenceBetweenGMTandJST);
return self
);

end SBCalendar
\end{vdm_al}

\begin{rtinfo}
[SBCalendar]{vdm.tc}[SBCalendar]
\end{rtinfo}

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