/**
* A lazy build of edge container for specified vertex.
*
* @param vertex a vertex in this graph.
*
* @return an edge container
*/
protected DirectedEdgeContainer <V, E> getEdgeContainer(V vertex)
{
DirectedEdgeContainer <V, E> ec = vertexMapDirected[vertex];
if (ec == null)
{
ec = new DirectedEdgeContainer <V, E> (edgeSetFactory, vertex);
vertexMapDirected[vertex] = ec;
}
return(ec);
}
/**
* {@inheritDoc}
*/
public override E getEdge(V sourceVertex, V targetVertex)
{
if (abstractBaseGraph.containsVertex(sourceVertex) &&
abstractBaseGraph.containsVertex(targetVertex))
{
DirectedEdgeContainer <V, E> ec = getEdgeContainer(sourceVertex);
foreach (E e in ec.outgoing)
{
if (abstractBaseGraph.getEdgeTarget(e).Equals(targetVertex))
{
return(e);
}
}
}
return(default(E));
}
/**
* {@inheritDoc}
*/
public override HashSet <E> getAllEdges(V sourceVertex, V targetVertex)
{
List <E> edges = null;
if (abstractBaseGraph.containsVertex(sourceVertex) &&
abstractBaseGraph.containsVertex(targetVertex))
{
edges = new ArrayUnenforcedSet <E>();
DirectedEdgeContainer <V, E> ec = getEdgeContainer(sourceVertex);
foreach (E e in ec.outgoing)
{
if (abstractBaseGraph.getEdgeTarget(e).Equals(targetVertex))
{
edges.Add(e);
}
}
}
return(new HashSet <E>(edges));
}