code: public static String type(FunctionEnum fe) {
          if (fe == null) {
              return DFLT_NODE_SHAPE;
          }
          switch (fe) {
          case ABUNDANCE:
              return "ver_ellipsis";
          case BIOLOGICAL_PROCESS:
              return "rhombus";
          case CATALYTIC_ACTIVITY:
              return "hexagon";
          case CELL_SECRETION:
              return "arc";
          case CELL_SURFACE_EXPRESSION:
              return "arc";
          case CHAPERONE_ACTIVITY:
              return "hexagon";
          case COMPLEX_ABUNDANCE:
              return "hor_ellipsis";
          case COMPOSITE_ABUNDANCE:
              return "hor_ellipsis";
          case DEGRADATION:
              return "hor_ellipsis";
          case GENE_ABUNDANCE:
              return "hor_ellipsis";
          case GTP_BOUND_ACTIVITY:
              return "hexagon";
          case KINASE_ACTIVITY:
              return "hexagon";
          case MICRORNA_ABUNDANCE:
              return "hor_ellipsis";
          case MOLECULAR_ACTIVITY:
              return "hexagon";
          case PATHOLOGY:
              return "rhombus";
          case PEPTIDASE_ACTIVITY:
              return "hexagon";
          case PHOSPHATASE_ACTIVITY:
              return "hexagon";
          case PRODUCTS:
          case PROTEIN_ABUNDANCE:
              return "hor_ellipsis";
          case REACTANTS:
          case RIBOSYLATION_ACTIVITY:
              return "hexagon";
          case RNA_ABUNDANCE:
              return "hor_ellipsis";
          case TRANSCRIPTIONAL_ACTIVITY:
              return "hexagon";
          case TRANSPORT_ACTIVITY:
              return "hexagon";
          }
          return DFLT_NODE_SHAPE;
      }
docs: Returns a shape for the supplied {@link FunctionEnum}.
  
  @param fe {@link FunctionEnum}
  @return Non-null {@link String}
  @see #DFLT_NODE_SHAPE