private static void NormaliseSubtractedMonth(Iso8601Date isoDate)
{
Date date = new Date(isoDate.year, isoDate.month);
date.NormaliseSubtractedMonth();
isoDate.year = date.Year;
isoDate.month = date.Month;
}
private static void NormaliseMonth(Iso8601Date isoDate)
{
DesignByContract.Check.Require(!isoDate.MonthUnknown, "isoDate monthUnknown must be false.");
Date date = new Date(isoDate.year, isoDate.month);
date.NormaliseMonth();
isoDate.year = date.Year;
isoDate.month = date.Month;
}
internal Iso8601Date Subtract(Iso8601Duration duration)
{
DesignByContract.Check.Require(duration != null, "duration must not be null.");
Iso8601Date newDate = new Iso8601Date(this.ToString());
Iso8601Duration normalisedDuration = Iso8601Duration.Normalise(duration);
if (normalisedDuration.Days > 0)
{
if (newDate.DayUnknown)
{
throw new NotSupportedException("Cannot subtract a duration with days when the datetime day unknow.");
}
newDate.day -= normalisedDuration.Days;
NormaliseSubtractedDay(newDate);
}
if (normalisedDuration.Months > 0)
{
if (newDate.MonthUnknown)
{
throw new NotSupportedException("Cannot subtract a duration with months when the datetime month unknow.");
}
newDate.month -= normalisedDuration.Months;
NormaliseSubtractedMonth(newDate);
if (!newDate.DayUnknown && (newDate.day > System.DateTime.DaysInMonth(newDate.year, newDate.month)))
{
newDate.day = System.DateTime.DaysInMonth(newDate.year, newDate.month);
}
}
if (normalisedDuration.Years > 0)
{
if (normalisedDuration.Years > newDate.year)
{
throw new ApplicationException("duration.Years must not greater than the dateTime.year");
}
newDate.year -= normalisedDuration.Years;
}
return(newDate);
}
internal Iso8601Date Add(Iso8601Duration duration)
{
DesignByContract.Check.Require(duration != null, "duration must not be null.");
Iso8601Date newDate = new Iso8601Date(this.ToString());
Iso8601Duration normalisedDuration = Iso8601Duration.Normalise(duration);
if (normalisedDuration.Months > 0)
{
if (newDate.MonthUnknown)
{
throw new NotSupportedException("Cannot add a duration with months when the datetime month unknow.");
}
newDate.month += normalisedDuration.Months;
NormaliseMonth(newDate);
if (normalisedDuration.Days <= 0)
{
if (!newDate.DayUnknown && newDate.day > System.DateTime.DaysInMonth(newDate.year, newDate.month))
{
newDate.day = System.DateTime.DaysInMonth(newDate.year, newDate.month);
}
}
}
if (normalisedDuration.Years > 0)
{
newDate.year += normalisedDuration.Years;
}
if (normalisedDuration.Days > 0)
{
if (newDate.DayUnknown)
{
throw new NotSupportedException("Cannot add a duration with days when the datetime day unknow.");
}
newDate.day += normalisedDuration.Days;
NormaliseDay(newDate);
}
return(newDate);
}
private static void NormaliseSubtractedMonth(Iso8601Date isoDate)
{
Date date = new Date(isoDate.year, isoDate.month);
date.NormaliseSubtractedMonth();
isoDate.year = date.Year;
isoDate.month = date.Month;
}
private static void NormaliseSubtractedDay(Iso8601Date isoDate)
{
DesignByContract.Check.Require(!isoDate.MonthUnknown, "isoDate monthUnknown must be false.");
Date date = new Date(isoDate.year, isoDate.month, isoDate.day);
date.NormaliseSubtractedDay();
isoDate.year = date.Year;
isoDate.month = date.Month;
isoDate.day = date.Day;
}
internal Iso8601Date Subtract(Iso8601Duration duration)
{
DesignByContract.Check.Require(duration != null, "duration must not be null.");
Iso8601Date newDate = new Iso8601Date(this.ToString());
Iso8601Duration normalisedDuration = Iso8601Duration.Normalise(duration);
if (normalisedDuration.Days > 0)
{
if (newDate.DayUnknown)
throw new NotSupportedException("Cannot subtract a duration with days when the datetime day unknow.");
newDate.day -= normalisedDuration.Days;
NormaliseSubtractedDay(newDate);
}
if (normalisedDuration.Months > 0)
{
if (newDate.MonthUnknown)
throw new NotSupportedException("Cannot subtract a duration with months when the datetime month unknow.");
newDate.month -= normalisedDuration.Months;
NormaliseSubtractedMonth(newDate);
if (!newDate.DayUnknown &&(newDate.day>System.DateTime.DaysInMonth(newDate.year, newDate.month)))
{
newDate.day = System.DateTime.DaysInMonth(newDate.year, newDate.month);
}
}
if (normalisedDuration.Years > 0)
{
if (normalisedDuration.Years > newDate.year)
throw new ApplicationException("duration.Years must not greater than the dateTime.year");
newDate.year -= normalisedDuration.Years;
}
return newDate;
}
internal Iso8601Date Add(Iso8601Duration duration)
{
DesignByContract.Check.Require(duration != null, "duration must not be null.");
Iso8601Date newDate = new Iso8601Date(this.ToString());
Iso8601Duration normalisedDuration = Iso8601Duration.Normalise(duration);
if (normalisedDuration.Months > 0)
{
if (newDate.MonthUnknown)
throw new NotSupportedException("Cannot add a duration with months when the datetime month unknow.");
newDate.month += normalisedDuration.Months;
NormaliseMonth(newDate);
if (normalisedDuration.Days <= 0)
{
if (!newDate.DayUnknown && newDate.day > System.DateTime.DaysInMonth(newDate.year, newDate.month))
newDate.day = System.DateTime.DaysInMonth(newDate.year, newDate.month);
}
}
if (normalisedDuration.Years > 0)
newDate.year += normalisedDuration.Years;
if (normalisedDuration.Days > 0)
{
if (newDate.DayUnknown)
throw new NotSupportedException("Cannot add a duration with days when the datetime day unknow.");
newDate.day += normalisedDuration.Days;
NormaliseDay(newDate);
}
return newDate;
}
private bool IsMatchPattern(Iso8601Date isoDate)
{
DesignByContract.Check.Require(isoDate != null,
string.Format(CommonStrings.XMustNotBeNull, "isoDate"));
DesignByContract.Check.Require(this.Pattern != null,
string.Format(CommonStrings.XMustNotBeNull, "Pattern"));
if (!CDateTime.IsMatchValidityKind(this.MonthValidity, isoDate.MonthUnknown))
return false;
if (!CDateTime.IsMatchValidityKind(this.DayValidity, isoDate.DayUnknown))
return false;
return true;
}
internal override string ValidValue(object aValue)
{
DesignByContract.Check.Require(aValue != null, string.Format(CommonStrings.XMustNotBeNull, "aValue"));
if (!Iso8601Date.ValidIso8601Date(aValue.ToString()))
return string.Format(AmValidationStrings.InvalidIsoDateX, aValue);
Iso8601Date isoDate = new Iso8601Date(aValue.ToString());
if (isoDate == null)
throw new ApplicationException(string.Format(CommonStrings.XIsNull, "isoDate"));
if (this.Pattern != null)
{
if (!IsMatchPattern(isoDate))
{
return string.Format(AmValidationStrings.DateXDoesNotMatchPatternY, aValue, Pattern);
}
}
if (this.Range != null)
{
if (!this.Range.Has(isoDate))
{
return string.Format(AmValidationStrings.DateXOutOfRange, aValue);
}
}
return string.Empty;
}
/// <summary>
/// Compare the current date instance with the obj. Returns 0 if they are equal,
/// -1 if the current instance less than obj, 1 if the current instance greater than obj.
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public int CompareTo(object obj)
{
// precondition is that the current instance must be the same type as obj
Check.Require(this.GetType() == obj.GetType(),
"The current instance (" + this.GetType().ToString() + ") must be the same type as the obj("
+ obj.GetType().ToString() + ")");
Iso8601Date objDate = obj as Iso8601Date;
// compare yyyy
if (this.year < objDate.year)
{
return(-1);
}
else if (this.year > objDate.year)
{
return(1);
}
// if yyyy is the same, compare month
if (this.MonthUnknown && objDate.MonthUnknown)
{
return(0);
}
else if ((!this.MonthUnknown && objDate.MonthUnknown) ||
(this.MonthUnknown && !objDate.MonthUnknown))
{
throw new FormatException
("An unknown month cannot be compared with a valid month value.");
}
// if the two dates have month value
else
{
if (this.month > objDate.month)
{
return(1);
}
else if (this.month < objDate.month)
{
return(-1);
}
else // if the month is the same, compare day
{
if (this.DayUnknown && objDate.DayUnknown)
{
return(0);
}
else if ((!this.DayUnknown && objDate.DayUnknown) ||
(this.DayUnknown && !objDate.DayUnknown))
{
throw new FormatException
("An unknown day cannot be compared with a valid day value.");
}
else
{
if (this.day > objDate.day)
{
return(1);
}
else if (this.day < objDate.day)
{
return(-1);
}
else
{
return(0);
}
}
}
}
}
