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Pure Elixir HL7 v2.x toolkit — schema-driven parsing, typed segments, message builder, MLLP transport
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lib/hl7v2/type/csu.ex
defmodule HL7v2.Type.CSU do
@moduledoc """
Channel Sensitivity and Units (CSU) -- HL7v2 composite data type.
Defines the sensitivity and units of measurement for a waveform channel.
Used in CD (Channel Definition).
7 components:
1. Channel Sensitivity (NM)
2. Unit of Measure Identifier (ST)
3. Unit of Measure Description (ST)
4. Unit of Measure Coding System (ID) -- Table 0396
5. Alternate Unit of Measure Identifier (ST)
6. Alternate Unit of Measure Text (ST)
7. Alternate Unit of Measure Coding System (ID) -- Table 0396
"""
@behaviour HL7v2.Type
alias HL7v2.Type
defstruct [
:channel_sensitivity,
:unit_of_measure_identifier,
:unit_of_measure_description,
:unit_of_measure_coding_system,
:alternate_unit_of_measure_identifier,
:alternate_unit_of_measure_text,
:alternate_unit_of_measure_coding_system
]
@type t :: %__MODULE__{
channel_sensitivity: binary() | nil,
unit_of_measure_identifier: binary() | nil,
unit_of_measure_description: binary() | nil,
unit_of_measure_coding_system: binary() | nil,
alternate_unit_of_measure_identifier: binary() | nil,
alternate_unit_of_measure_text: binary() | nil,
alternate_unit_of_measure_coding_system: binary() | nil
}
@doc """
Parses a CSU from a list of components.
## Examples
iex> HL7v2.Type.CSU.parse(["0.1", "mV", "millivolts", "UCUM"])
%HL7v2.Type.CSU{channel_sensitivity: "0.1", unit_of_measure_identifier: "mV", unit_of_measure_description: "millivolts", unit_of_measure_coding_system: "UCUM"}
iex> HL7v2.Type.CSU.parse([])
%HL7v2.Type.CSU{}
"""
@spec parse(list()) :: t()
def parse(components) when is_list(components) do
%__MODULE__{
channel_sensitivity: Type.get_component(components, 0),
unit_of_measure_identifier: Type.get_component(components, 1),
unit_of_measure_description: Type.get_component(components, 2),
unit_of_measure_coding_system: Type.get_component(components, 3),
alternate_unit_of_measure_identifier: Type.get_component(components, 4),
alternate_unit_of_measure_text: Type.get_component(components, 5),
alternate_unit_of_measure_coding_system: Type.get_component(components, 6)
}
end
@doc """
Encodes a CSU to a list of component strings.
## Examples
iex> HL7v2.Type.CSU.encode(%HL7v2.Type.CSU{channel_sensitivity: "0.1", unit_of_measure_identifier: "mV"})
["0.1", "mV"]
iex> HL7v2.Type.CSU.encode(nil)
[]
"""
@spec encode(t() | nil) :: list()
def encode(nil), do: []
def encode(%__MODULE__{} = csu) do
[
csu.channel_sensitivity || "",
csu.unit_of_measure_identifier || "",
csu.unit_of_measure_description || "",
csu.unit_of_measure_coding_system || "",
csu.alternate_unit_of_measure_identifier || "",
csu.alternate_unit_of_measure_text || "",
csu.alternate_unit_of_measure_coding_system || ""
]
|> Type.trim_trailing()
end
end