/// <summary>
/// Recalculates the dates of the task based on the start dates of its
/// dependencies. The earliest date that the task will use as its start date
/// (in the situation where it has no dependencies, for example) is the value
/// passed as earliestDate.
/// </summary>
/// <param name="earliestDate">The earliest date that the task can use as its start
/// date.</param>
/// <param name="week">The working week to base calculations on.</param>
public void RecalculateDates(DateTime earliestDate, Week week)
{
var latestDate = earliestDate;
// Get a list of all dependencies that affect this task.
// That includes all dependencies that this task has and
// that its parents have.
var allDependencies = new List <IDependency>();
ITask task = this;
while (task != null)
{
foreach (var dependency in task.Dependencies)
{
allDependencies.Add(dependency);
}
task = task.Parent;
}
foreach (var dependency in allDependencies)
{
var dependencyDate = dependency.StartDate(week);
// Only update the date if the dependency starts later than the
// currently calculated date
if (dependencyDate > latestDate)
{
latestDate = dependencyDate;
}
}
// Ensure that the start date falls within a working shift
mStartDate = week.AscendingShifts(latestDate, DateTime.MaxValue).ElementAt(0).StartTime;
// Work out end date using working week. We subtract 1 from the duration
// to ensure that, should the end date be at the end of a working shift,
// we retrieve the correct shift from the working week later
mEndDate = week.DateAdd(mStartDate, mDuration.Subtract(new TimeSpan(0, 0, 0, 0, 1)));
// Ensure that the end date falls within a working shift
mEndDate = week.AscendingShifts(mEndDate, DateTime.MaxValue).ElementAt(0).StartTime;
// Add the millisecond back on to the date that we subtracted earlier
mEndDate = mEndDate.Add(new TimeSpan(0, 0, 0, 0, 1));
}
static void Main(string[] args)
{
Week week = new Week();
week.AddShift(DayOfWeek.Monday, 9, 30, 0, 0, TimeSpan.FromHours(2));
week.AddShift(DayOfWeek.Monday, 12, 30, 0, 0, TimeSpan.FromHours(2));
week.AddShift(DayOfWeek.Monday, 15, 30, 0, 0, TimeSpan.FromHours(2));
week.AddShift(DayOfWeek.Tuesday, 9, 30, 0, 0, TimeSpan.FromHours(2));
week.AddShift(DayOfWeek.Tuesday, 12, 30, 0, 0, TimeSpan.FromHours(2));
week.AddShift(DayOfWeek.Tuesday, 15, 30, 0, 0, TimeSpan.FromHours(2));
week.AddShift(DayOfWeek.Wednesday, 9, 30, 0, 0, TimeSpan.FromHours(2));
week.AddShift(DayOfWeek.Wednesday, 12, 30, 0, 0, TimeSpan.FromHours(2));
week.AddShift(DayOfWeek.Wednesday, 15, 30, 0, 0, TimeSpan.FromHours(2));
week.RemoveShift(DayOfWeek.Tuesday, 12, 30, 0, 0);
foreach (Shift shift in week.AscendingShifts(new DateTime(2010, 6, 28, 0, 0, 0), new DateTime(2010, 6, 30, 0, 0, 0)))
{
System.Diagnostics.Debug.WriteLine(shift.StartTime);
}
foreach (Shift shift in week.DescendingShifts(new DateTime(2010, 6, 30, 0, 0, 0), new DateTime(2010, 6, 28, 0, 0, 0)))
{
System.Diagnostics.Debug.WriteLine(shift.StartTime);
}
System.Diagnostics.Debug.WriteLine("");
System.Diagnostics.Debug.WriteLine(week.DateAdd(new DateTime(2010, 6, 30, 0, 0, 0), new TimeSpan(29, 2, 3, 0)));
System.Diagnostics.Debug.WriteLine("");
System.Diagnostics.Debug.WriteLine(week.DateAdd(new DateTime(2010, 6, 30, 0, 0, 0), new TimeSpan(-29, 2, 0, 0)));
System.Diagnostics.Debug.WriteLine("");
System.Diagnostics.Debug.WriteLine(week.DateDiff(new DateTime(2010, 6, 30, 0, 0, 0), new DateTime(2010, 7, 1, 0, 0, 0)));
System.Diagnostics.Debug.WriteLine("");
System.Diagnostics.Debug.WriteLine(week.DateDiff(new DateTime(2010, 7, 1, 0, 0, 0), new DateTime(2010, 6, 30, 0, 0, 0)));
System.Diagnostics.Debug.WriteLine("");
System.Diagnostics.Debug.WriteLine(week.Duration);
}