/**
* Creates a new iterator for the specified graph. Iteration will start at the specified start
* vertex. If the specified start vertex is <code>
* null</code>, Iteration will start at an arbitrary graph vertex.
*
* @param g the graph to be iterated.
* @param startVertex the vertex iteration to be started.
* @throws IllegalArgumentException if <code>g==null</code> or does not contain <code>startVertex
* </code>
*/
public CrossComponentIterator(Graph<V, E> g, V startVertex) {
super();
if (g == null) {
throw new IllegalArgumentException("graph must not be null");
}
graph = g;
specifics = createGraphSpecifics(g);
vertexIterator = g.vertexSet().iterator();
setCrossComponentTraversal(startVertex == null);
reusableEdgeEvent = new FlyweightEdgeEvent<V, E>(this, null);
reusableVertexEvent = new FlyweightVertexEvent<V>(this, null);
if (startVertex == null) {
// pick a start vertex if graph not empty
if (vertexIterator.hasNext()) {
this.startVertex = vertexIterator.next();
} else {
this.startVertex = null;
}
} else if (g.containsVertex(startVertex)) {
this.startVertex = startVertex;
} else {
throw new IllegalArgumentException("graph must contain the start vertex");
}
}
@Override
public void generateGraph(
Graph<V, E> veGraph, VertexFactory<V> vVertexFactory, Map<String, V> stringVMap) {
Map<Integer, V> intToNodeMap = new HashMap<Integer, V>();
for (Integer nodeID : selected.vertices.keySet()) {
V node = vVertexFactory.createVertex();
if (!veGraph.containsVertex(node)) veGraph.addVertex(node);
intToNodeMap.put(nodeID, node);
}
for (PajekArc arc : selected.arcs) {
V source = intToNodeMap.get(arc.source);
V target = intToNodeMap.get(arc.target);
E edge = null;
if (!veGraph.containsEdge(source, target)) edge = veGraph.addEdge(source, target);
else edge = veGraph.getEdge(source, target);
if (veGraph instanceof WeightedGraph)
((WeightedGraph) veGraph).setEdgeWeight(edge, arc.weight);
}
}