code: public static Titan1Edge createEdge(Titan1Graph graph, Edge source) {
  
          if (source == null) {
              return null;
          }
          return new Titan1Edge(graph, source);
      }
docs: Creates a Titan1Edge that corresponds to the given Gremlin Edge.
  
  @param graph The graph the edge should be created in
  @param source The gremlin edge