private bool TryGetEdge(TNode source, TNode destination, out AdjacentNodeEdge <TNode> nodeedge)
{
nodeedge = null;
if (DoesNodeExist(source))
{
nodeedge = GetGraphNode(source).Neighbours.SingleOrDefault(x => x.Node.Equals(destination));
}
return(nodeedge != null);
}
public void AddEdge(AbstractAdjacentGraphNode <TNode> graphNode, AdjacentNodeEdge <TNode> adjacentNodeEdge)
{
//Validate Arguments
if (graphNode == null)
{
throw new ArgumentNullException("graphNode");
}
if (adjacentNodeEdge == null)
{
throw new ArgumentNullException("adjacentNodeEdge");
}
if (graphNode.Node.Equals(adjacentNodeEdge.Node))
{
throw new ArgumentException(
string.Format("The source {0} node and the destinate node cannot be the same", graphNode.Node));
}
if (adjacentNodeEdge.Weight <= 0)
{
throw new InvalidEdgeWeightException(
string.Format("The edge weight {0} is invalid. It must be greater than zero",
adjacentNodeEdge.Weight));
}
AdjacentNodeEdge <TNode> existingNodeEdge;
if (TryGetEdge(graphNode.Node, adjacentNodeEdge.Node, out existingNodeEdge))
{
throw new DuplicateEdgeException(
string.Format(
"An edge with weight {0} from source node {1} to destination node {2} already exists! ",
existingNodeEdge.Weight, graphNode.Node, adjacentNodeEdge.Node));
}
//Create Nodes and Edge
AddNodeIfDoesntExist(graphNode.Node).AddEdgeNeighbour(adjacentNodeEdge);
AddNodeIfDoesntExist(adjacentNodeEdge.Node);
}
public override void AddEdgeNeighbour(AdjacentNodeEdge <TNode> adjacentNodeEdge)
{
AdjacentNodeEdges.Add(adjacentNodeEdge);
}