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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/srt.ex
defmodule HL7v2.Type.SRT do
@moduledoc """
Sort Order (SRT) -- HL7v2 composite data type.
Used in query definitions to specify result sorting.
2 components:
1. Sort-by Field (ST) -- segment field name, e.g., "PID.3"
2. Sequencing (ID) -- A (ascending), D (descending), N (none)
"""
@behaviour HL7v2.Type
alias HL7v2.Type
defstruct [:sort_by_field, :sequencing]
@type t :: %__MODULE__{
sort_by_field: binary() | nil,
sequencing: binary() | nil
}
@doc """
Parses a SRT from a list of components.
## Examples
iex> HL7v2.Type.SRT.parse(["PID.3", "A"])
%HL7v2.Type.SRT{sort_by_field: "PID.3", sequencing: "A"}
iex> HL7v2.Type.SRT.parse(["OBR.4"])
%HL7v2.Type.SRT{sort_by_field: "OBR.4"}
iex> HL7v2.Type.SRT.parse([])
%HL7v2.Type.SRT{}
"""
@spec parse(list()) :: t()
def parse(components) when is_list(components) do
%__MODULE__{
sort_by_field: Type.get_component(components, 0),
sequencing: Type.get_component(components, 1)
}
end
@doc """
Encodes a SRT to a list of component strings.
## Examples
iex> HL7v2.Type.SRT.encode(%HL7v2.Type.SRT{sort_by_field: "PID.3", sequencing: "A"})
["PID.3", "A"]
iex> HL7v2.Type.SRT.encode(%HL7v2.Type.SRT{sort_by_field: "OBR.4"})
["OBR.4"]
iex> HL7v2.Type.SRT.encode(nil)
[]
"""
@spec encode(t() | nil) :: list()
def encode(nil), do: []
def encode(%__MODULE__{} = srt) do
[
srt.sort_by_field || "",
srt.sequencing || ""
]
|> Type.trim_trailing()
end
end