public bool RemoveNode(Node <CONTENT> node)
{
Debug.Assert(null != node);
Debug.Assert(NodeSet.Contains(node));
if (null == node || !NodeSet.Contains(node))
{
return(false);
}
// otherwise, the node was found
NodeSet.Remove(node);
// This is optimized as we assume that edges are always bidirectional
node.ForEachNeighbor(neighbor => neighbor.RemoveDirectedEdge(node));
// For directed edges, must enumerate through each node in the nodeSet,
// removing edges to this node
//foreach (WeightedNode<CONTENT> otherNode in nodeSet)
//{
// if (otherNode.Neighbors.ContainsKey(node))
// {
// otherNode.Neighbors.Remove(node);
// }
//}
return(true);
}
/// <summary>
/// Breadth First Search
/// </summary>
/// <param name="action">an Action accepting 1 parameter CONTENT</param>
public void BFS(Action <Node <CONTENT> > action)
{
var visited = new HashSet <Node <CONTENT> >();
var notVisited = new Node <CONTENT> [Count];
NodeSet.CopyTo(notVisited);
// This is a disjoint set, so visit each vertice
foreach (var start in NodeSet)
{
if (!visited.Contains(start))
{
var queue = new Queue <Node <CONTENT> >();
visited.Add(start);
action(start);
queue.Enqueue(start);
while (queue.Count != 0)
{
Node <CONTENT> node = queue.Dequeue();
node.ForEachNeighbor(neighbor =>
{
if (!visited.Contains(neighbor))
{
visited.Add(neighbor);
action(neighbor);
queue.Enqueue(neighbor);
}
});
}
}
}
}
private void RunDFS(Node <CONTENT> node, Dictionary <Node <CONTENT>, VertexState> state, Action <Node <CONTENT> > action)
{
state[node] = VertexState.Gray;
action(node);
node.ForEachNeighbor((neighbor) =>
{
if (!state.ContainsKey(neighbor)) // VertexState.White
{
RunDFS(neighbor, state, action);
}
});
state[node] = VertexState.Black;
}