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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/dlt.ex
defmodule HL7v2.Type.DLT do
@moduledoc """
Delta (DLT) -- HL7v2 composite data type.
Specifies delta check parameters for observation values.
4 components:
1. Normal Range (NR) -- sub-components (low & high)
2. Numeric Threshold (NM)
3. Change Computation (ID) -- percent, absolute
4. Days Retained (NM)
"""
@behaviour HL7v2.Type
alias HL7v2.Type
alias HL7v2.Type.NR
defstruct [:normal_range, :numeric_threshold, :change_computation, :days_retained]
@type t :: %__MODULE__{
normal_range: NR.t() | nil,
numeric_threshold: binary() | nil,
change_computation: binary() | nil,
days_retained: binary() | nil
}
@doc """
Parses a DLT from a list of components.
## Examples
iex> HL7v2.Type.DLT.parse(["2.5&10.0", "5", "P", "7"])
%HL7v2.Type.DLT{
normal_range: %HL7v2.Type.NR{
low: %HL7v2.Type.NM{value: "2.5", original: "2.5"},
high: %HL7v2.Type.NM{value: "10", original: "10.0"}
},
numeric_threshold: "5",
change_computation: "P",
days_retained: "7"
}
iex> HL7v2.Type.DLT.parse([])
%HL7v2.Type.DLT{}
"""
@spec parse(list()) :: t()
def parse(components) when is_list(components) do
%__MODULE__{
normal_range: Type.parse_sub(NR, Type.get_component(components, 0)),
numeric_threshold: Type.get_component(components, 1),
change_computation: Type.get_component(components, 2),
days_retained: Type.get_component(components, 3)
}
end
@doc """
Encodes a DLT to a list of component strings.
## Examples
iex> HL7v2.Type.DLT.encode(%HL7v2.Type.DLT{numeric_threshold: "5", change_computation: "P"})
["", "5", "P"]
iex> HL7v2.Type.DLT.encode(nil)
[]
"""
@spec encode(t() | nil) :: list()
def encode(nil), do: []
def encode(%__MODULE__{} = dlt) do
[
Type.encode_sub(NR, dlt.normal_range),
dlt.numeric_threshold || "",
dlt.change_computation || "",
dlt.days_retained || ""
]
|> Type.trim_trailing()
end
end