48 lines
1.3 KiB
Elixir
48 lines
1.3 KiB
Elixir
defmodule JSON.LD.NodeIdentifierMap do
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@moduledoc nil
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use GenServer
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# Client API
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@spec start_link(keyword) :: GenServer.on_start()
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def start_link(opts \\ []) do
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GenServer.start_link(__MODULE__, :ok, opts)
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end
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@spec stop(GenServer.server(), atom, timeout) :: :ok
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def stop(pid, reason \\ :normal, timeout \\ :infinity) do
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:ok = GenServer.stop(pid, reason, timeout)
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end
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@doc """
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Generate Blank Node Identifier
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Details at <https://www.w3.org/TR/json-ld-api/#generate-blank-node-identifier>
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"""
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@spec generate_blank_node_id(GenServer.server(), String.t() | nil) :: String.t()
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def generate_blank_node_id(pid, identifier \\ nil) do
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GenServer.call(pid, {:generate_id, identifier})
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end
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# Server Callbacks
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@spec init(:ok) :: {:ok, map}
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def init(:ok) do
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{:ok, %{map: %{}, counter: 0}}
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end
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@spec handle_call({:generate_id, String.t() | nil}, GenServer.from(), map) ::
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{:reply, String.t(), map}
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def handle_call({:generate_id, identifier}, _, %{map: map, counter: counter} = state) do
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if identifier && map[identifier] do
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{:reply, map[identifier], state}
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else
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blank_node_id = "_:b#{counter}"
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map = if identifier, do: Map.put(map, identifier, blank_node_id), else: map
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{:reply, blank_node_id, %{counter: counter + 1, map: map}}
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end
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end
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end
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