public static String getParameterExpression(GenOperation genOperation) {
    StringBuffer result = new StringBuffer();
    result.append('(');

    for (Iterator<GenParameter> i = genOperation.getGenParameters().iterator(); i.hasNext(); ) {
      GenParameter genParameter = i.next();
      result.append(getTypeExpression(genParameter));
      if (i.hasNext()) {
        result.append(", ");
      }
    }
    result.append(')');
    return result.toString();
  }