public E getEdge(V sourceVertex, V targetVertex) {
E res = null;
if (g1.containsVertex(sourceVertex) && g1.containsVertex(targetVertex)) {
res = g1.getEdge(sourceVertex, targetVertex);
}
if ((res == null) && g2.containsVertex(sourceVertex) && g2.containsVertex(targetVertex)) {
res = g2.getEdge(sourceVertex, targetVertex);
}
return res;
}
public Set<E> edgesOf(V vertex) {
Set<E> res = new HashSet<E>();
if (g1.containsVertex(vertex)) {
res.addAll(g1.edgesOf(vertex));
}
if (g2.containsVertex(vertex)) {
res.addAll(g2.edgesOf(vertex));
}
return Collections.unmodifiableSet(res);
}
public Set<E> getAllEdges(V sourceVertex, V targetVertex) {
Set<E> res = new HashSet<E>();
if (g1.containsVertex(sourceVertex) && g1.containsVertex(targetVertex)) {
res.addAll(g1.getAllEdges(sourceVertex, targetVertex));
}
if (g2.containsVertex(sourceVertex) && g2.containsVertex(targetVertex)) {
res.addAll(g2.getAllEdges(sourceVertex, targetVertex));
}
return Collections.unmodifiableSet(res);
}
public boolean containsVertex(V v) {
return g1.containsVertex(v) || g2.containsVertex(v);
}