public void UnlinkFromDescendant(PertTask descendant)
{
if (this._descendants.Contains(descendant))
{
this._descendants.Remove(descendant);
descendant._ancestors.Remove(this);
}
else
{
throw new ArgumentException($"Task '{this.Name}' does not have task '{descendant.Name}' as a descendant.");
}
}
public void UnlinkFromAncestor(PertTask ancestor)
{
if (this._ancestors.Contains(ancestor))
{
ancestor._descendants.Remove(this);
this._ancestors.Remove(ancestor);
}
else
{
throw new ArgumentException($"Task '{this.Name}' does not have task '{ancestor.Name}' as an ancestor.");
}
}
public TaskViewModel(PertTask taskModel)
{
this._task = taskModel;
this.Resources = new ObservableCollection <IResource>();
foreach (var modelResource in this.Model.Resources)
{
this.Resources.Add(modelResource);
}
this.Resources.CollectionChanged += Resources_CollectionChanged;
this.TimeEstimate = new EstimateViewModel(this._task.TimeEstimate);
this.TimeEstimate.PropertyChanged += TimeEstimate_PropertyChanged;
}
public void LinkToDescendant(PertTask descendant)
{
if (descendant == this)
{
throw new ArgumentException("Cannot link a task to itself");
}
if (descendant.AllDescendants.Contains(this))
{
throw new ArgumentException($"Making task '{descendant.Name}' a descendant of task '{this.Name}' would create a cyclic project network.");
}
if (this._descendants.Contains(descendant))
{
throw new ArgumentException($"Task '{descendant.Name}' is already an ancestor of task '{this.Name}'.");
}
this._descendants.Add(descendant);
descendant._ancestors.Add(this);
}
public void LinkToAncestor(PertTask ancestor)
{
// Check to make sure we're not creating a cyclic graph
if (ancestor == this)
{
throw new ArgumentException("Cannot link a task to itself");
}
if (ancestor.AllAncestors.Contains(this))
{
throw new ArgumentException($"Making task '{ancestor.Name}' an ancestor of task '{this.Name}' would create a cyclic project network.");
}
if (this._ancestors.Contains(ancestor))
{
throw new ArgumentException($"Task '{ancestor.Name}' is already an ancestor of task '{this.Name}'.");
}
this._ancestors.Add(ancestor);
ancestor._descendants.Add(this);
}
/// <summary>
/// Return as HashSet with all descendants of a task located by recursively walking the graph
/// </summary>
/// <param name="task">The task to find all descendants of</param>
/// <returns></returns>
public static HashSet <PertTask> AllDescendantsOf(PertTask task)
{
var tasks = new HashSet <PertTask>();
var checkTasks = new Queue <PertTask>();
checkTasks.Enqueue(task);
while (checkTasks.Count != 0)
{
var working = checkTasks.Dequeue();
foreach (var item in working.Descendants)
{
checkTasks.Enqueue(item);
}
tasks.Add(working);
}
tasks.Remove(task);
return(tasks);
}
public void RemoveTask(PertTask task)
{
this._tasks.Remove(task);
task.UnlinkAll();
}
public void AddTask(PertTask task)
{
this._tasks.Add(task);
}