code: private KamEdge resolveEdge(final Kam kam, final KamNode subjectKamNode,
              final RelationshipType rtype, final KamNode objectKamNode) {
          final KamEdge resolvedEdge = kam.findEdge(subjectKamNode, rtype,
                  objectKamNode);
          return resolvedEdge;
      }
docs: Resolve edge based on a subject {@link KamNode},
  {@link RelationshipType}, and an object {@link KamNode}.
  
  @param kam {@link Kam}, the kam to resolve into
  @param subjectKamNode {@link KamNode}, the subject kam node
  @param rtype {@link RelationshipType}, the relationship type
  @param objectKamNode {@link KamNode}, the object kam node
  @return the resolved {@link KamEdge}, or null if it does not exist in
  the {@link Kam}