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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/prl.ex
defmodule HL7v2.Type.PRL do
@moduledoc """
Parent Result Link (PRL) -- HL7v2 composite data type.
Links a child observation to its parent observation result.
3 components:
1. Parent Observation Identifier (CE) -- sub-components delimited by `&`
2. Parent Observation Sub-Identifier (ST)
3. Parent Observation Value Descriptor (TX)
"""
@behaviour HL7v2.Type
alias HL7v2.Type
alias HL7v2.Type.CE
defstruct [
:parent_observation_identifier,
:parent_observation_sub_identifier,
:parent_observation_value_descriptor
]
@type t :: %__MODULE__{
parent_observation_identifier: CE.t() | nil,
parent_observation_sub_identifier: binary() | nil,
parent_observation_value_descriptor: binary() | nil
}
@doc """
Parses a PRL from a list of components.
## Examples
iex> HL7v2.Type.PRL.parse(["85025&CBC&CPT4", "1", "Hemoglobin"])
%HL7v2.Type.PRL{
parent_observation_identifier: %HL7v2.Type.CE{identifier: "85025", text: "CBC", name_of_coding_system: "CPT4"},
parent_observation_sub_identifier: "1",
parent_observation_value_descriptor: "Hemoglobin"
}
iex> HL7v2.Type.PRL.parse(["85025&CBC&CPT4"])
%HL7v2.Type.PRL{parent_observation_identifier: %HL7v2.Type.CE{identifier: "85025", text: "CBC", name_of_coding_system: "CPT4"}}
iex> HL7v2.Type.PRL.parse([])
%HL7v2.Type.PRL{}
"""
@spec parse(list()) :: t()
def parse(components) when is_list(components) do
%__MODULE__{
parent_observation_identifier: Type.parse_sub(CE, Type.get_component(components, 0)),
parent_observation_sub_identifier: Type.get_component(components, 1),
parent_observation_value_descriptor: Type.get_component(components, 2)
}
end
@doc """
Encodes a PRL to a list of component strings.
## Examples
iex> HL7v2.Type.PRL.encode(%HL7v2.Type.PRL{parent_observation_identifier: %HL7v2.Type.CE{identifier: "85025", text: "CBC", name_of_coding_system: "CPT4"}, parent_observation_sub_identifier: "1"})
["85025&CBC&CPT4", "1"]
iex> HL7v2.Type.PRL.encode(nil)
[]
"""
@spec encode(t() | nil) :: list()
def encode(nil), do: []
def encode(%__MODULE__{} = prl) do
[
Type.encode_sub(CE, prl.parent_observation_identifier),
prl.parent_observation_sub_identifier || "",
prl.parent_observation_value_descriptor || ""
]
|> Type.trim_trailing()
end
end