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hl7v2
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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/wvi.ex
defmodule HL7v2.Type.WVI do
@moduledoc """
Channel Identifier (WVI) -- HL7v2 composite data type.
Identifies a waveform channel. Used in CD (Channel Definition).
2 components:
1. Channel Number (NM)
2. Channel Name (ST)
"""
@behaviour HL7v2.Type
alias HL7v2.Type
defstruct [:channel_number, :channel_name]
@type t :: %__MODULE__{
channel_number: binary() | nil,
channel_name: binary() | nil
}
@doc """
Parses a WVI from a list of components.
## Examples
iex> HL7v2.Type.WVI.parse(["1", "Lead I"])
%HL7v2.Type.WVI{channel_number: "1", channel_name: "Lead I"}
iex> HL7v2.Type.WVI.parse(["3"])
%HL7v2.Type.WVI{channel_number: "3"}
iex> HL7v2.Type.WVI.parse([])
%HL7v2.Type.WVI{}
"""
@spec parse(list()) :: t()
def parse(components) when is_list(components) do
%__MODULE__{
channel_number: Type.get_component(components, 0),
channel_name: Type.get_component(components, 1)
}
end
@doc """
Encodes a WVI to a list of component strings.
## Examples
iex> HL7v2.Type.WVI.encode(%HL7v2.Type.WVI{channel_number: "1", channel_name: "Lead I"})
["1", "Lead I"]
iex> HL7v2.Type.WVI.encode(%HL7v2.Type.WVI{channel_number: "3"})
["3"]
iex> HL7v2.Type.WVI.encode(nil)
[]
"""
@spec encode(t() | nil) :: list()
def encode(nil), do: []
def encode(%__MODULE__{} = wvi) do
[
wvi.channel_number || "",
wvi.channel_name || ""
]
|> Type.trim_trailing()
end
end