/// <param name="dateRange">An open ended date range to determine the difference of</param>
/// <exception cref="ArgumentException">End date of the date range must be greater than its start</exception>
public DateDifference(IOpenEndedDateRange dateRange)
{
if (dateRange.End.HasValue)
{
if (dateRange.Start <= dateRange.End.Value)
{
_earlier = dateRange.Start;
_later = dateRange.End.Value;
}
else
{
_earlier = dateRange.End.Value;
_later = dateRange.Start;
}
}
else
throw new ArgumentException($"End date must be greater than {dateRange.Start:F}", nameof(dateRange));
}
private static void ValidityCheck(IOpenEndedDateRange dateRange)
{
if (dateRange?.End != null)
ValidityCheck(dateRange.Start, dateRange.End.Value);
}
/// <inheritdoc cref="Overlaps(IDateRange, IDateRange, bool)" />
public static bool Overlaps(this IOpenEndedDateRange dateRange, IOpenEndedDateRange compareRange, bool allowSameEndPoints = true)
{
if (dateRange == null || compareRange == null)
return false;
ValidityCheck(dateRange);
ValidityCheck(compareRange);
if (!dateRange.End.HasValue && compareRange.End.HasValue)
{
return allowSameEndPoints
? compareRange.Start > dateRange.Start || compareRange.End.Value > dateRange.Start
: compareRange.Start >= dateRange.Start || compareRange.End.Value >= dateRange.Start;
}
if (dateRange.End.HasValue && !compareRange.End.HasValue)
{
return allowSameEndPoints
? dateRange.Start > compareRange.Start || dateRange.End.Value > compareRange.Start
: dateRange.Start >= compareRange.Start || dateRange.End.Value >= compareRange.Start;
}
if (!dateRange.End.HasValue && !compareRange.End.HasValue)
return true;
return compareRange.End != null && dateRange.End != null &&
Date.Overlaps(dateRange.Start, dateRange.End.Value, compareRange.Start, compareRange.End.Value, allowSameEndPoints);
}
/// <inheritdoc cref="Overlaps(IDateRange, IDateRange, bool)" />
public static bool Overlaps(this IDateRange dateRange, IOpenEndedDateRange compareRange, bool allowSameEndPoints = true)
{
if (dateRange == null || compareRange == null)
return false;
if (compareRange.End.HasValue)
return Date.Overlaps(dateRange.Start, dateRange.End, compareRange.Start, compareRange.End.Value, allowSameEndPoints);
ValidityCheck(dateRange);
ValidityCheck(compareRange);
return allowSameEndPoints
? dateRange.Start > compareRange.Start || dateRange.End > compareRange.Start
: dateRange.Start >= compareRange.Start || dateRange.End >= compareRange.Start;
}
/// <inheritdoc cref="Within(DateTime, IDateRange, bool)" />
public static bool Within(this DateTime? dateTime, IOpenEndedDateRange dateRange, bool allowSameEndPoints = true)
{
if (dateRange == null)
return false;
return dateTime?.Within(dateRange, allowSameEndPoints) ?? false;
}
/// <inheritdoc cref="Within(DateTime, IDateRange, bool)" />
public static bool Within(this DateTime dateTime, IOpenEndedDateRange dateRange, bool allowSameEndPoints = true)
{
if (dateRange == null)
return false;
return allowSameEndPoints
? dateTime > dateRange.Start
: dateTime >= dateRange.Start;
}
