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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/scv.ex
defmodule HL7v2.Type.SCV do
@moduledoc """
Scheduling Class Value Pair (SCV) -- HL7v2 composite data type.
Associates a scheduling parameter class with its value. Used in APR segment.
2 components:
1. Parameter Class (CWE) -- sub-components, Table 0294
2. Parameter Value (ST)
"""
@behaviour HL7v2.Type
alias HL7v2.Type
alias HL7v2.Type.CWE
defstruct [:parameter_class, :parameter_value]
@type t :: %__MODULE__{
parameter_class: CWE.t() | nil,
parameter_value: binary() | nil
}
@doc """
Parses an SCV from a list of components.
## Examples
iex> HL7v2.Type.SCV.parse(["PREFDAY&Preferred Day&HL70294", "MON"])
%HL7v2.Type.SCV{
parameter_class: %HL7v2.Type.CWE{identifier: "PREFDAY", text: "Preferred Day", name_of_coding_system: "HL70294"},
parameter_value: "MON"
}
iex> HL7v2.Type.SCV.parse([])
%HL7v2.Type.SCV{}
"""
@spec parse(list()) :: t()
def parse(components) when is_list(components) do
%__MODULE__{
parameter_class: Type.parse_sub(CWE, Type.get_component(components, 0)),
parameter_value: Type.get_component(components, 1)
}
end
@doc """
Encodes an SCV to a list of component strings.
## Examples
iex> HL7v2.Type.SCV.encode(%HL7v2.Type.SCV{parameter_class: %HL7v2.Type.CWE{identifier: "PREFDAY"}, parameter_value: "MON"})
["PREFDAY", "MON"]
iex> HL7v2.Type.SCV.encode(nil)
[]
"""
@spec encode(t() | nil) :: list()
def encode(nil), do: []
def encode(%__MODULE__{} = scv) do
[
Type.encode_sub(CWE, scv.parameter_class),
scv.parameter_value || ""
]
|> Type.trim_trailing()
end
end