internal void UpdateDependenciesFrom(
DataKind kind,
string fromKey,
ItemDescriptor fromItem
)
{
var fromWhat = new KindAndKey(kind, fromKey);
var updatedDependencies = ComputeDependenciesFrom(kind, fromItem); // never null
if (_dependenciesFrom.TryGetValue(fromWhat, out var oldDependencySet))
{
foreach (var oldDep in oldDependencySet)
{
if (_dependenciesTo.TryGetValue(oldDep, out var depsToThisOldDep))
{
depsToThisOldDep.Remove(fromWhat);
}
}
}
_dependenciesFrom[fromWhat] = updatedDependencies;
foreach (var newDep in updatedDependencies)
{
if (!_dependenciesTo.TryGetValue(newDep, out var depsToThisNewDep))
{
depsToThisNewDep = new HashSet <KindAndKey>();
_dependenciesTo[newDep] = depsToThisNewDep;
}
depsToThisNewDep.Add(fromWhat);
}
}
internal void AddAffectedItems(ISet <KindAndKey> itemsOut, KindAndKey initialModifiedItem)
{
if (!itemsOut.Contains(initialModifiedItem))
{
itemsOut.Add(initialModifiedItem);
if (_dependenciesTo.TryGetValue(initialModifiedItem, out var affectedItems))
{
foreach (var affectedItem in affectedItems)
{
AddAffectedItems(itemsOut, affectedItem);
}
}
}
}