public IEnumerable <TEdge> GetOutgoingEdges(TVertex vertex)
{
if (!OutgoingEdges.ContainsKey(vertex))
{
return(Enumerable.Empty <TEdge>());
}
return(OutgoingEdges[vertex].SelectMany(v => v.Value));
}
public bool AddVertex(TVertex vertex)
{
if (OutgoingEdges.ContainsKey(vertex))
{
return(false);
}
OutgoingEdges[vertex] = InnerMap;
IncomingEdges[vertex] = InnerMap;
return(true);
}
public bool RemoveVertex(TVertex vertex)
{
if (!OutgoingEdges.ContainsKey(vertex))
{
return(false);
}
foreach (var other in OutgoingEdges[vertex].Keys)
{
IncomingEdges[other].Remove(vertex);
}
foreach (var other in IncomingEdges[vertex].Keys)
{
OutgoingEdges[other].Remove(vertex);
}
OutgoingEdges.Remove(vertex);
IncomingEdges.Remove(vertex);
return(true);
}
public bool RemoveEdges(TVertex source, TVertex dest)
{
if (!OutgoingEdges.ContainsKey(source))
{
return(false);
}
if (!IncomingEdges.ContainsKey(dest))
{
return(false);
}
if (!OutgoingEdges[source].ContainsKey(dest))
{
return(false);
}
OutgoingEdges[source].Remove(dest);
IncomingEdges[dest].Remove(source);
return(true);
}
// Remove v and all v's edges and update incoming edge count accordingly
public void RemoveNodeAndAllOutgoingEdges(TableExpression v)
{
if (OutgoingEdges.ContainsKey(v))
{
// Remove all edges
IList <TableExpression> edges;
if (OutgoingEdges.TryGetValue(v, out edges))
{
while (edges.Any())
{
var u = edges[0];
edges.RemoveAt(0);
IncomingEdgesCount[u]--;
}
}
// Remove node
OutgoingEdges.Remove(v);
IncomingEdgesCount.Remove(v);
}
}
public bool RemoveEdge(TVertex source, TVertex dest, TEdge data)
{
if (!OutgoingEdges.ContainsKey(source))
{
return(false);
}
if (!IncomingEdges.ContainsKey(dest))
{
return(false);
}
if (!OutgoingEdges[source].ContainsKey(dest))
{
return(false);
}
bool foundOut = OutgoingEdges.ContainsKey(source) && OutgoingEdges[source].ContainsKey(dest) && OutgoingEdges[source][dest].Remove(data);
bool foundIn = IncomingEdges.ContainsKey(dest) && IncomingEdges[dest].ContainsKey(source) && IncomingEdges[dest][source].Remove(data);
if (foundOut && !foundIn)
{
throw new Exception("Edge found in outgoing but not incoming"); // TODO: Specialized Exception
}
if (foundIn && !foundOut)
{
throw new Exception("Edge found in incoming but not outgoing"); // TODO: Specialized Exception
}
if (OutgoingEdges.ContainsKey(source) && (!OutgoingEdges[source].ContainsKey(dest) || OutgoingEdges[source][dest].Count == 0))
{
OutgoingEdges[source].Remove(dest);
}
if (IncomingEdges.ContainsKey(dest) && (!IncomingEdges[dest].ContainsKey(source) || IncomingEdges[dest][source].Count == 0))
{
IncomingEdges[dest].Remove(source);
}
return(foundOut);
}
public bool ContainsVertex(TVertex vertex) => OutgoingEdges.ContainsKey(vertex);