def input_parameter_json
      tmp_params = []
      @input_parameters.each_value { |v| tmp_params << v.as_struct if v.set? }
      param_struct = { parameters: tmp_params }
      param_struct.to_json
    end
def input_parameter_json
      tmp_params = []
      @input_parameters.each_value { |v| tmp_params << v.as_struct if v.set? }
      param_struct = { parameters: tmp_params }
      param_struct.to_json
    end
Convert the input parameters to a JSON document
 @return [String]