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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/qsc.ex
defmodule HL7v2.Type.QSC do
@moduledoc """
Query Selection Criteria (QSC) -- HL7v2 composite data type.
Used in QRD for specifying selection criteria in queries.
4 components:
1. Segment Field Name (ST) -- e.g., "@PID.3"
2. Relational Operator (ID) -- EQ, NE, GT, LT, GE, LE, CT, GN
3. Value (ST)
4. Relational Conjunction (ID) -- AND, OR
"""
@behaviour HL7v2.Type
alias HL7v2.Type
defstruct [:segment_field_name, :relational_operator, :value, :relational_conjunction]
@type t :: %__MODULE__{
segment_field_name: binary() | nil,
relational_operator: binary() | nil,
value: binary() | nil,
relational_conjunction: binary() | nil
}
@doc """
Parses a QSC from a list of components.
## Examples
iex> HL7v2.Type.QSC.parse(["@PID.3", "EQ", "12345", "AND"])
%HL7v2.Type.QSC{segment_field_name: "@PID.3", relational_operator: "EQ", value: "12345", relational_conjunction: "AND"}
iex> HL7v2.Type.QSC.parse(["@PID.5.1", "CT", "Smith"])
%HL7v2.Type.QSC{segment_field_name: "@PID.5.1", relational_operator: "CT", value: "Smith"}
iex> HL7v2.Type.QSC.parse([])
%HL7v2.Type.QSC{}
"""
@spec parse(list()) :: t()
def parse(components) when is_list(components) do
%__MODULE__{
segment_field_name: Type.get_component(components, 0),
relational_operator: Type.get_component(components, 1),
value: Type.get_component(components, 2),
relational_conjunction: Type.get_component(components, 3)
}
end
@doc """
Encodes a QSC to a list of component strings.
## Examples
iex> HL7v2.Type.QSC.encode(%HL7v2.Type.QSC{segment_field_name: "@PID.3", relational_operator: "EQ", value: "12345"})
["@PID.3", "EQ", "12345"]
iex> HL7v2.Type.QSC.encode(nil)
[]
"""
@spec encode(t() | nil) :: list()
def encode(nil), do: []
def encode(%__MODULE__{} = qsc) do
[
qsc.segment_field_name || "",
qsc.relational_operator || "",
qsc.value || "",
qsc.relational_conjunction || ""
]
|> Type.trim_trailing()
end
end