protected bool ChangeEdgeHeadNode(T edgeId, T newHeadNodeId)
{
// Do not attend this unless all dependencies are satisfied.
if (!AllDependenciesSatisfied)
{
return(false);
}
Node <T, TNodeContent> oldHeadNode = EdgeHeadNodeLookup[edgeId];
bool changeHeadSuccess = ChangeEdgeHeadNodeWithoutCleanup(edgeId, newHeadNodeId);
if (!changeHeadSuccess)
{
throw new InvalidOperationException($@"Unable to change head node of edge {edgeId} to node {newHeadNodeId} without cleanup");
}
// If the old head node has no other incoming edges, then
// connect its outgoing edges to the current tail node.
IList <T> oldHeadNodeIncomingEdgeIds = oldHeadNode.IncomingEdges.ToList();
if (!oldHeadNodeIncomingEdgeIds.Any())
{
Node <T, TNodeContent> tailNode = EdgeTailNodeLookup[edgeId];
IList <T> oldHeadNodeOutgoingEdgeIds = oldHeadNode.OutgoingEdges.ToList();
foreach (T oldHeadNodeOutgoingEdgeId in oldHeadNodeOutgoingEdgeIds)
{
bool changeTailSuccess = ChangeEdgeTailNodeWithoutCleanup(oldHeadNodeOutgoingEdgeId, tailNode.Id);
if (!changeTailSuccess)
{
throw new InvalidOperationException($@"Unable to change tail node of edge {oldHeadNodeOutgoingEdgeId} to node {tailNode.Id} without cleanup");
}
}
}
// Final check to see if the head node has no incoming or outgoing edges.
// If it does not then remove it.
if (oldHeadNode.NodeType != NodeType.End &&
oldHeadNode.NodeType != NodeType.Isolated &&
!oldHeadNode.IncomingEdges.Any() &&
!oldHeadNode.OutgoingEdges.Any())
{
NodeLookup.Remove(oldHeadNode.Id);
}
return(true);
}
public virtual void Remove(Node n)
{
if (n is OutputNode)
{
OutputNodes.Remove(n.Id);
}
else if (n is InputNode)
{
InputNodes.Remove(n.Id);
}
NodeLookup.Remove(n.Id);
if (Nodes.Remove(n))
{
n.OnUpdate -= N_OnUpdate;
}
n.Dispose();
}
public override bool RemoveActivity(T activityId)
{
// Retrieve the activity's node.
if (!NodeLookup.TryGetValue(activityId, out Node <T, TActivity> node))
{
return(false);
}
if (!node.Content.CanBeRemoved)
{
return(false);
}
RemoveUnsatisfiedSuccessorActivity(activityId);
NodeLookup.Remove(node.Id);
if (node.NodeType == NodeType.Isolated)
{
return(true);
}
if (node.NodeType == NodeType.End ||
node.NodeType == NodeType.Normal)
{
IList <T> incomingEdgeIds = node.IncomingEdges.ToList();
int length = incomingEdgeIds.Count;
for (int i = 0; i < length; i++)
{
T edgeId = incomingEdgeIds[i];
Node <T, TActivity> tailNode = EdgeTailNodeLookup[edgeId];
// Remove the edge from the tail node.
tailNode.OutgoingEdges.Remove(edgeId);
EdgeTailNodeLookup.Remove(edgeId);
if (!tailNode.OutgoingEdges.Any())
{
if (tailNode.NodeType == NodeType.Normal)
{
tailNode.SetNodeType(NodeType.End);
}
else if (tailNode.NodeType == NodeType.Start)
{
tailNode.SetNodeType(NodeType.Isolated);
}
}
// Remove the edge from the head node.
node.IncomingEdges.Remove(edgeId);
EdgeHeadNodeLookup.Remove(edgeId);
if (!node.IncomingEdges.Any())
{
if (node.NodeType == NodeType.Normal)
{
node.SetNodeType(NodeType.Start);
}
else if (node.NodeType == NodeType.End)
{
node.SetNodeType(NodeType.Isolated);
}
}
// Remove the edge completely.
EdgeLookup.Remove(edgeId);
}
}
if (node.NodeType == NodeType.Start ||
node.NodeType == NodeType.Normal)
{
IList <T> outgoingEdgeIds = node.OutgoingEdges.ToList();
int length = outgoingEdgeIds.Count;
for (int i = 0; i < length; i++)
{
T edgeId = outgoingEdgeIds[i];
Node <T, TActivity> headNode = EdgeHeadNodeLookup[edgeId];
// Remove the edge from the head node.
headNode.IncomingEdges.Remove(edgeId);
EdgeHeadNodeLookup.Remove(edgeId);
if (!headNode.IncomingEdges.Any())
{
if (headNode.NodeType == NodeType.Normal)
{
headNode.SetNodeType(NodeType.Start);
}
else if (headNode.NodeType == NodeType.End)
{
headNode.SetNodeType(NodeType.Isolated);
}
}
// Remove the edge from the tail node.
node.OutgoingEdges.Remove(edgeId);
EdgeTailNodeLookup.Remove(edgeId);
if (!node.OutgoingEdges.Any())
{
if (node.NodeType == NodeType.Normal)
{
node.SetNodeType(NodeType.End);
}
else if (node.NodeType == NodeType.Start)
{
node.SetNodeType(NodeType.Isolated);
}
}
// Remove the edge completely.
EdgeLookup.Remove(edgeId);
}
}
return(true);
}
