protected void setEdgeProperty(String propName, Edge e, Object prop) {
		ObjectAttribute<Edge> attrib = getEdgeAttribute(propName);
		attrib.setValue(e, prop);
	}
This is a helper method that sets a object property named propName 
to edge e.
Ghidra/Framework/Generic/src/main/java/ghidra/util/graph/DirectedGraph.java