@Override
	public double getWeight(Edge e) {
		Edge[] ft = this.getEdges(e.from(), e.to());
		if (ft.length == 0) {
			return 0.0;
		}
		return super.getWeight(ft[0]);
	}
Add an edge with the specified edge weight. 

If an edge from and to the vertices
specified by the edge already exists in the graph,
then the edge weight in increased
by the specified value.

@return true if the edge was added sucessfully.
Ghidra/Framework/Generic/src/main/java/ghidra/util/graph/SimpleWeightedDigraph.java