/**
* Returns a new graph with the same structure as the one wrapped here, and with vertices
* generated by the given {@link Function1}. Edges are copied in direction and weight.
*
* @param factory the vertex factory used to instantiate new vertices in the new graph
* @param function the function used to set values of a new vertex in the new graph, from the
* matching spot
* @param mappings a map that will receive mappings from {@link Spot} to the new vertices. Can be
* <code>null</code> if you do not want to get the mappings
* @return a new {@link SimpleDirectedWeightedGraph}.
*/
public <V> SimpleDirectedWeightedGraph<V, DefaultWeightedEdge> copy(
final VertexFactory<V> factory,
final Function1<Spot, V> function,
final Map<Spot, V> mappings) {
final SimpleDirectedWeightedGraph<V, DefaultWeightedEdge> copy =
new SimpleDirectedWeightedGraph<V, DefaultWeightedEdge>(DefaultWeightedEdge.class);
final Set<Spot> spots = graph.vertexSet();
// To store mapping of old graph vs new graph
Map<Spot, V> map;
if (null == mappings) {
map = new HashMap<Spot, V>(spots.size());
} else {
map = mappings;
}
// Generate new vertices
for (final Spot spot : Collections.unmodifiableCollection(spots)) {
final V vertex = factory.createVertex();
function.compute(spot, vertex);
map.put(spot, vertex);
copy.addVertex(vertex);
}
// Generate new edges
for (final DefaultWeightedEdge edge : graph.edgeSet()) {
final DefaultWeightedEdge newEdge =
copy.addEdge(map.get(graph.getEdgeSource(edge)), map.get(graph.getEdgeTarget(edge)));
copy.setEdgeWeight(newEdge, graph.getEdgeWeight(edge));
}
return copy;
}
/** @see Graph#getEdgeWeight(Object) */
public double getEdgeWeight(final DefaultWeightedEdge edge) {
return graph.getEdgeWeight(edge);
}