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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/na.ex
defmodule HL7v2.Type.NA do
@moduledoc """
Numeric Array (NA) -- HL7v2 composite data type.
Contains a variable number of numeric (NM) values. Used in OBX for
waveform data (single-channel numeric arrays).
Variable components (4+ per HL7 spec):
1. Value 1 (NM)
2. Value 2 (NM)
3. Value 3 (NM)
4. Value 4 (NM)
... additional values as needed
"""
@behaviour HL7v2.Type
alias HL7v2.Type
defstruct values: []
@type t :: %__MODULE__{
values: [binary()]
}
@doc """
Parses an NA from a list of components.
All components are stored as a list of string values.
## Examples
iex> HL7v2.Type.NA.parse(["10", "20", "30", "40"])
%HL7v2.Type.NA{values: ["10", "20", "30", "40"]}
iex> HL7v2.Type.NA.parse(["100"])
%HL7v2.Type.NA{values: ["100"]}
iex> HL7v2.Type.NA.parse([])
%HL7v2.Type.NA{}
"""
@spec parse(list()) :: t()
def parse(components) when is_list(components) do
vals =
components
|> Enum.map(&Type.get_component([&1], 0))
|> Enum.reject(&is_nil/1)
%__MODULE__{values: vals}
end
@doc """
Encodes an NA to a list of component strings.
## Examples
iex> HL7v2.Type.NA.encode(%HL7v2.Type.NA{values: ["10", "20", "30", "40"]})
["10", "20", "30", "40"]
iex> HL7v2.Type.NA.encode(%HL7v2.Type.NA{})
[]
iex> HL7v2.Type.NA.encode(nil)
[]
"""
@spec encode(t() | nil) :: list()
def encode(nil), do: []
def encode(%__MODULE__{values: []}), do: []
def encode(%__MODULE__{values: vals}), do: vals
end