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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/vr.ex
defmodule HL7v2.Type.VR do
@moduledoc """
Value Range (VR) -- HL7v2 composite data type.
Specifies a range of values for a field. Used as a query parameter.
2 components:
1. First Data Code Value (ST)
2. Last Data Code Value (ST)
"""
@behaviour HL7v2.Type
alias HL7v2.Type
defstruct [:first_data_code_value, :last_data_code_value]
@type t :: %__MODULE__{
first_data_code_value: binary() | nil,
last_data_code_value: binary() | nil
}
@doc """
Parses a VR from a list of components.
## Examples
iex> HL7v2.Type.VR.parse(["A", "Z"])
%HL7v2.Type.VR{first_data_code_value: "A", last_data_code_value: "Z"}
iex> HL7v2.Type.VR.parse(["100"])
%HL7v2.Type.VR{first_data_code_value: "100"}
iex> HL7v2.Type.VR.parse([])
%HL7v2.Type.VR{}
"""
@spec parse(list()) :: t()
def parse(components) when is_list(components) do
%__MODULE__{
first_data_code_value: Type.get_component(components, 0),
last_data_code_value: Type.get_component(components, 1)
}
end
@doc """
Encodes a VR to a list of component strings.
## Examples
iex> HL7v2.Type.VR.encode(%HL7v2.Type.VR{first_data_code_value: "A", last_data_code_value: "Z"})
["A", "Z"]
iex> HL7v2.Type.VR.encode(%HL7v2.Type.VR{first_data_code_value: "100"})
["100"]
iex> HL7v2.Type.VR.encode(nil)
[]
"""
@spec encode(t() | nil) :: list()
def encode(nil), do: []
def encode(%__MODULE__{} = vr) do
[
vr.first_data_code_value || "",
vr.last_data_code_value || ""
]
|> Type.trim_trailing()
end
end