code: public final String getTypeSignature() {
          final StringBuffer sb = new StringBuffer();
          sb.append(getName());
          sb.append("(");
          for (int i = 0; i < getArguments().size(); i++) {
              if (i > 0) {
                  sb.append(", ");
              }
              final SgArgument arg = getArguments().get(i);
              sb.append(arg.getType().getSimpleName());
          }
          sb.append(")");
          return sb.toString();
      }
docs: Returns the "type" signature of the method.
  
  @return Method name and argument types (like
  "methodXY(String, int, boolean)").