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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/validation/message_rules.ex
defmodule HL7v2.Validation.MessageRules do
@moduledoc """
Message-level validation rules for HL7v2 typed messages.
Checks structural invariants that apply to the message as a whole:
first segment must be MSH, and critical MSH fields must be present.
"""
alias HL7v2.TypedMessage
@doc """
Returns a list of message-level validation errors.
Checks:
- First segment is `%HL7v2.Segment.MSH{}`
- `MSH.message_type` is present
- `MSH.message_control_id` is present
"""
@spec check(TypedMessage.t()) :: [map()]
def check(%TypedMessage{segments: segments}) do
case segments do
[%HL7v2.Segment.MSH{} = msh | _] ->
check_msh_fields(msh)
[_ | _] ->
[%{level: :error, location: "MSH", field: nil, message: "first segment must be MSH"}]
[] ->
[%{level: :error, location: "MSH", field: nil, message: "message has no segments"}]
end
end
defp check_msh_fields(msh) do
errors = []
errors =
if is_nil(msh.message_type) do
[
%{
level: :error,
location: "MSH",
field: :message_type,
message: "required field message_type is missing"
}
| errors
]
else
errors
end
errors =
if is_nil(msh.message_control_id) do
[
%{
level: :error,
location: "MSH",
field: :message_control_id,
message: "required field message_control_id is missing"
}
| errors
]
else
errors
end
Enum.reverse(errors)
end
end