private void UpdateGraphEdges(
IVertex <Tag> vertex, IReadOnlyCollection <string> newSuccessors, IReadOnlyCollection <string> newAncestors)
{
var oldSuccessors = vertex.Successors.Select(tag => tag.Name)
.ToList().AsReadOnly();
var oldAncestors = vertex.Ancestors.Select(tag => tag.Name)
.ToList().AsReadOnly();
foreach (var tagName in oldAncestors.Except(newAncestors))
{
vertex.DeleteParent(_graph[tagName]);
}
foreach (var tagName in oldSuccessors.Except(newSuccessors))
{
vertex.DeleteChild(_graph[tagName]);
}
foreach (var tagName in newAncestors.Except(oldAncestors))
{
vertex.AddParent(_graph[tagName]);
}
foreach (var tagName in newSuccessors.Except(oldSuccessors))
{
vertex.AddChild(_graph[tagName]);
}
}