565 lines
18 KiB
Elixir
565 lines
18 KiB
Elixir
defmodule RDF.Dataset do
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@moduledoc """
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Defines a RDF Dataset.
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A `RDF.Dataset` represents a set of `RDF.Dataset`s.
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"""
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defstruct name: nil, graphs: %{}
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@behaviour Access
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alias RDF.{Graph, Description}
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import RDF.Statement
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@type t :: module
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@doc """
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Creates an empty unnamed `RDF.Dataset`.
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"""
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def new,
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do: %RDF.Dataset{}
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@doc """
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Creates an unnamed `RDF.Dataset` with an initial statement.
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"""
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def new(statement) when is_tuple(statement),
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do: new() |> add(statement)
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@doc """
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Creates an unnamed `RDF.Dataset` with initial statements.
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"""
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def new(statements) when is_list(statements),
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do: new() |> add(statements)
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@doc """
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Creates an unnamed `RDF.Dataset` with a `RDF.Description`.
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"""
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def new(%RDF.Description{} = description),
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do: new() |> add(description)
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@doc """
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Creates an unnamed `RDF.Dataset` with a `RDF.Graph`.
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"""
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def new(%RDF.Graph{} = graph),
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do: new() |> add(graph, graph.name)
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@doc """
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Creates an empty named `RDF.Dataset`.
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"""
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def new(name),
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do: %RDF.Dataset{name: RDF.uri(name)}
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@doc """
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Creates a named `RDF.Dataset` with an initial statement.
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"""
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def new(name, statement) when is_tuple(statement),
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do: new(name) |> add(statement)
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@doc """
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Creates a named `RDF.Dataset` with initial statements.
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"""
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def new(name, statements) when is_list(statements),
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do: new(name) |> add(statements)
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@doc """
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Creates a named `RDF.Dataset` with a `RDF.Description`.
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"""
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def new(name, %RDF.Description{} = description),
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do: new(name) |> add(description)
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@doc """
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Creates a named `RDF.Dataset` with a `RDF.Graph`.
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"""
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def new(name, %RDF.Graph{} = graph),
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do: new(name) |> add(graph, graph.name)
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@doc """
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Adds triples and quads to a `RDF.Dataset`.
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The optional third argument `graph_context` defaulting to `nil` for the default
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graph, specifies the graph to which the statements are added.
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Note: This also applies when adding a named graph. Its name is ignored over
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`graph_context` and its default value.
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"""
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def add(dataset, statements, graph_context \\ nil)
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def add(dataset, statements, graph_context) when is_list(statements) do
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with graph_context = convert_graph_name(graph_context) do
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Enum.reduce statements, dataset, fn (statement, dataset) ->
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add(dataset, statement, graph_context)
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end
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end
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end
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def add(dataset, {subject, predicate, objects}, graph_context),
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do: add(dataset, {subject, predicate, objects, graph_context})
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def add(%RDF.Dataset{name: name, graphs: graphs},
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{subject, predicate, objects, graph_context}, _) do
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with graph_context = convert_graph_name(graph_context) do
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updated_graphs =
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Map.update(graphs, graph_context,
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Graph.new(graph_context, {subject, predicate, objects}),
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fn graph -> Graph.add(graph, {subject, predicate, objects}) end)
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%RDF.Dataset{name: name, graphs: updated_graphs}
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end
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end
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def add(%RDF.Dataset{name: name, graphs: graphs},
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%Description{} = description, graph_context) do
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with graph_context = convert_graph_name(graph_context) do
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updated_graph =
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Map.get(graphs, graph_context, Graph.new(graph_context))
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|> Graph.add(description)
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%RDF.Dataset{
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name: name,
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graphs: Map.put(graphs, graph_context, updated_graph)
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}
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end
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end
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def add(%RDF.Dataset{name: name, graphs: graphs}, %Graph{} = graph,
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graph_context) do
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with graph_context = convert_graph_name(graph_context) do
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%RDF.Dataset{name: name,
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graphs:
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Map.update(graphs, graph_context, Graph.new(graph_context, graph), fn current ->
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current |> Graph.add(graph)
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end)
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}
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end
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end
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@doc """
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Adds statements to a `RDF.Dataset` and overwrites all existing statements with the same subjects and predicates in the specified graph context.
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# Examples
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iex> dataset = RDF.Dataset.new({EX.S, EX.P1, EX.O1})
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...> RDF.Dataset.put(dataset, {EX.S, EX.P1, EX.O2})
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RDF.Dataset.new({EX.S, EX.P1, EX.O2})
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iex> RDF.Dataset.put(dataset, {EX.S, EX.P2, EX.O2})
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RDF.Dataset.new([{EX.S, EX.P1, EX.O1}, {EX.S, EX.P2, EX.O2}])
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iex> RDF.Dataset.new([{EX.S1, EX.P1, EX.O1}, {EX.S2, EX.P2, EX.O2}]) |>
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...> RDF.Dataset.put([{EX.S1, EX.P2, EX.O3}, {EX.S2, EX.P2, EX.O3}])
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RDF.Dataset.new([{EX.S1, EX.P1, EX.O1}, {EX.S1, EX.P2, EX.O3}, {EX.S2, EX.P2, EX.O3}])
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Note: When using a map to pass the statements you'll have to take care for yourselve to
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avoid using subject key clashes due to using inconsistent, semantically equivalent forms.
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iex> RDF.Dataset.put(RDF.Dataset.new, %{
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...> EX.S => [{EX.P, EX.O1}],
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...> {EX.S, nil} => [{EX.P, EX.O2}]})
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RDF.Dataset.new({EX.S, EX.P, EX.O2})
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The last always always wins in these cases. This decision was made to mitigate
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performance drawbacks. The list form will always take care of this for you:
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iex> RDF.Dataset.put(RDF.Dataset.new, [
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...> {EX.S, EX.P, EX.O1},
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...> {EX.S, EX.P, EX.O2, nil}])
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RDF.Dataset.new({EX.S, EX.P, EX.O1}, {EX.S, EX.P, EX.O2})
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"""
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def put(dataset, statements, graph_context \\ nil)
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def put(%RDF.Dataset{} = dataset, {subject, predicate, objects}, graph_context),
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do: put(dataset, {subject, predicate, objects, graph_context})
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def put(%RDF.Dataset{name: name, graphs: graphs},
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{subject, predicate, objects, graph_context}, _) do
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with graph_context = convert_graph_name(graph_context) do
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new_graph =
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case graphs[graph_context] do
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graph = %Graph{} ->
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Graph.put(graph, {subject, predicate, objects})
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nil ->
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Graph.new(graph_context, {subject, predicate, objects})
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end
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%RDF.Dataset{name: name,
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graphs: Map.put(graphs, graph_context, new_graph)}
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end
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end
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def put(%RDF.Dataset{} = dataset, statements, graph_context)
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when is_list(statements) do
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with graph_context = convert_graph_name(graph_context) do
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put dataset, Enum.group_by(statements,
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fn
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{s, _, _, nil} -> s
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{s, _, _, c} -> {s, c}
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{s, _, _} when is_nil(graph_context) -> s
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{s, _, _} -> {s, graph_context}
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end,
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fn
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{_, p, o, _} -> {p, o}
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{_, p, o} -> {p, o}
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end)
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end
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end
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def put(%RDF.Dataset{name: name, graphs: graphs},
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%Description{} = description, graph_context) do
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with graph_context = convert_graph_name(graph_context) do
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updated_graph =
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Map.get(graphs, graph_context, Graph.new(graph_context))
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|> Graph.put(description)
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%RDF.Dataset{
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name: name,
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graphs: Map.put(graphs, graph_context, updated_graph)
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}
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end
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end
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def put(%RDF.Dataset{name: name, graphs: graphs}, %Graph{} = graph,
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graph_context) do
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with graph_context = convert_graph_name(graph_context) do
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%RDF.Dataset{name: name,
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graphs:
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Map.update(graphs, graph_context, Graph.new(graph_context, graph), fn current ->
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current |> Graph.put(graph)
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end)
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}
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end
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end
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def put(%RDF.Dataset{} = dataset, statements, graph_context)
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when is_map(statements) do
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with graph_context = convert_graph_name(graph_context) do
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Enum.reduce statements, dataset,
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fn ({subject_with_context, predications}, dataset) ->
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put(dataset, subject_with_context, predications, graph_context)
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end
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end
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end
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def put(%RDF.Dataset{name: name, graphs: graphs},
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{subject, graph_context}, predications, default_graph_context)
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when is_list(predications) do
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with graph_context = graph_context || default_graph_context,
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graph_context = convert_graph_name(graph_context) do
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graph = Map.get(graphs, graph_context, Graph.new(graph_context))
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new_graphs = graphs
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|> Map.put(graph_context, Graph.put(graph, subject, predications))
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%RDF.Dataset{name: name, graphs: new_graphs}
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end
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end
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def put(%RDF.Dataset{} = dataset, subject, predications, graph_context)
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when is_list(predications),
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do: put(dataset, {subject, graph_context}, predications, graph_context)
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@doc """
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Fetches the `RDF.Graph` with the given name.
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When a graph with the given name can not be found can not be found `:error` is returned.
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# Examples
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iex> dataset = RDF.Dataset.new([{EX.S1, EX.P1, EX.O1, EX.Graph}, {EX.S2, EX.P2, EX.O2}])
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...> RDF.Dataset.fetch(dataset, EX.Graph)
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{:ok, RDF.Graph.new(EX.Graph, {EX.S1, EX.P1, EX.O1})}
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iex> RDF.Dataset.fetch(dataset, nil)
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{:ok, RDF.Graph.new({EX.S2, EX.P2, EX.O2})}
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iex> RDF.Dataset.fetch(dataset, EX.Foo)
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:error
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"""
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def fetch(%RDF.Dataset{graphs: graphs}, graph_name) do
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Access.fetch(graphs, convert_graph_name(graph_name))
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end
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@doc """
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Fetches the `RDF.Graph` with the given name.
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When a graph with the given name can not be found can not be found the optionally
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given default value or `nil` is returned
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# Examples
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iex> dataset = RDF.Dataset.new([{EX.S1, EX.P1, EX.O1, EX.Graph}, {EX.S2, EX.P2, EX.O2}])
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...> RDF.Dataset.get(dataset, EX.Graph)
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RDF.Graph.new(EX.Graph, {EX.S1, EX.P1, EX.O1})
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iex> RDF.Dataset.get(dataset, nil)
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RDF.Graph.new({EX.S2, EX.P2, EX.O2})
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iex> RDF.Dataset.get(dataset, EX.Foo)
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nil
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iex> RDF.Dataset.get(dataset, EX.Foo, :bar)
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:bar
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"""
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def get(%RDF.Dataset{} = dataset, graph_name, default \\ nil) do
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case fetch(dataset, graph_name) do
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{:ok, value} -> value
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:error -> default
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end
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end
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@doc """
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The graph with given name.
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"""
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def graph(%RDF.Dataset{graphs: graphs}, graph_name),
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do: Map.get(graphs, convert_graph_name(graph_name))
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@doc """
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The default graph of a `RDF.Dataset`.
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"""
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def default_graph(%RDF.Dataset{graphs: graphs}),
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do: Map.get(graphs, nil, Graph.new)
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@doc """
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Gets and updates the graph with the given name, in a single pass.
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Invokes the passed function on the `RDF.Graph` with the given name;
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this function should return either `{graph_to_return, new_graph}` or `:pop`.
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If the passed function returns `{graph_to_return, new_graph}`, the
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return value of `get_and_update` is `{graph_to_return, new_dataset}` where
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`new_dataset` is the input `Dataset` updated with `new_graph` for
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the given name.
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If the passed function returns `:pop` the graph with the given name is
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removed and a `{removed_graph, new_dataset}` tuple gets returned.
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# Examples
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iex> dataset = RDF.Dataset.new({EX.S, EX.P, EX.O, EX.Graph})
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...> RDF.Dataset.get_and_update(dataset, EX.Graph, fn current_graph ->
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...> {current_graph, {EX.S, EX.P, EX.NEW}}
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...> end)
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{RDF.Graph.new(EX.Graph, {EX.S, EX.P, EX.O}), RDF.Dataset.new({EX.S, EX.P, EX.NEW, EX.Graph})}
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"""
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def get_and_update(%RDF.Dataset{} = dataset, graph_name, fun) do
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with graph_context = convert_graph_name(graph_name) do
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case fun.(get(dataset, graph_context)) do
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{old_graph, new_graph} ->
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{old_graph, put(dataset, new_graph, graph_context)}
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:pop ->
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pop(dataset, graph_context)
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other ->
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raise "the given function must return a two-element tuple or :pop, got: #{inspect(other)}"
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end
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end
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end
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@doc """
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Pops the graph with the given name.
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When a graph with given name can not be found the optionally given default value
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or `nil` is returned.
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# Examples
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iex> dataset = RDF.Dataset.new([
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...> {EX.S1, EX.P1, EX.O1, EX.Graph},
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...> {EX.S2, EX.P2, EX.O2}])
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...> RDF.Dataset.pop(dataset, EX.Graph)
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{RDF.Graph.new(EX.Graph, {EX.S1, EX.P1, EX.O1}), RDF.Dataset.new({EX.S2, EX.P2, EX.O2})}
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iex> RDF.Dataset.pop(dataset, EX.Foo)
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{nil, dataset}
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"""
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def pop(%RDF.Dataset{name: name, graphs: graphs} = dataset, graph_name) do
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case Access.pop(graphs, convert_graph_name(graph_name)) do
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{nil, _} ->
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{nil, dataset}
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{graph, new_graphs} ->
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{graph, %RDF.Dataset{name: name, graphs: new_graphs}}
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end
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end
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@doc """
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The number of statements within a `RDF.Dataset`.
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# Examples
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iex> RDF.Dataset.new([
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...> {EX.S1, EX.p1, EX.O1, EX.Graph},
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...> {EX.S2, EX.p2, EX.O2},
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...> {EX.S1, EX.p2, EX.O3}]) |>
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...> RDF.Dataset.statement_count
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3
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"""
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def statement_count(%RDF.Dataset{graphs: graphs}) do
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Enum.reduce graphs, 0, fn ({_, graph}, count) ->
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count + Graph.triple_count(graph)
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end
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end
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@doc """
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The set of all subjects used in the statement within all graphs of a `RDF.Dataset`.
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# Examples
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iex> RDF.Dataset.new([
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...> {EX.S1, EX.p1, EX.O1, EX.Graph},
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...> {EX.S2, EX.p2, EX.O2},
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...> {EX.S1, EX.p2, EX.O3}]) |>
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...> RDF.Dataset.subjects
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MapSet.new([RDF.uri(EX.S1), RDF.uri(EX.S2)])
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"""
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def subjects(%RDF.Dataset{graphs: graphs}) do
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Enum.reduce graphs, MapSet.new, fn ({_, graph}, subjects) ->
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MapSet.union(subjects, Graph.subjects(graph))
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end
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end
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@doc """
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The set of all properties used in the predicates within all graphs of a `RDF.Dataset`.
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# Examples
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iex> RDF.Dataset.new([
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...> {EX.S1, EX.p1, EX.O1, EX.Graph},
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...> {EX.S2, EX.p2, EX.O2},
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...> {EX.S1, EX.p2, EX.O3}]) |>
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...> RDF.Dataset.predicates
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MapSet.new([EX.p1, EX.p2])
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"""
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def predicates(%RDF.Dataset{graphs: graphs}) do
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Enum.reduce graphs, MapSet.new, fn ({_, graph}, predicates) ->
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MapSet.union(predicates, Graph.predicates(graph))
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end
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end
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@doc """
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The set of all resources used in the objects within a `RDF.Dataset`.
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Note: This function does collect only URIs and BlankNodes, not Literals.
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# Examples
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iex> RDF.Dataset.new([
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...> {EX.S1, EX.p1, EX.O1, EX.Graph},
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...> {EX.S2, EX.p2, EX.O2, EX.Graph},
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...> {EX.S3, EX.p1, EX.O2},
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...> {EX.S4, EX.p2, RDF.bnode(:bnode)},
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...> {EX.S5, EX.p3, "foo"}
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...> ]) |> RDF.Dataset.objects
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MapSet.new([RDF.uri(EX.O1), RDF.uri(EX.O2), RDF.bnode(:bnode)])
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"""
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def objects(%RDF.Dataset{graphs: graphs}) do
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Enum.reduce graphs, MapSet.new, fn ({_, graph}, objects) ->
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MapSet.union(objects, Graph.objects(graph))
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end
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end
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@doc """
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The set of all resources used within a `RDF.Dataset`.
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# Examples
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iex> RDF.Dataset.new([
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...> {EX.S1, EX.p1, EX.O1, EX.Graph},
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...> {EX.S2, EX.p1, EX.O2, EX.Graph},
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...> {EX.S2, EX.p2, RDF.bnode(:bnode)},
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...> {EX.S3, EX.p1, "foo"}
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...> ]) |> RDF.Dataset.resources
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MapSet.new([RDF.uri(EX.S1), RDF.uri(EX.S2), RDF.uri(EX.S3),
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RDF.uri(EX.O1), RDF.uri(EX.O2), RDF.bnode(:bnode), EX.p1, EX.p2])
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"""
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def resources(%RDF.Dataset{graphs: graphs}) do
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Enum.reduce graphs, MapSet.new, fn ({_, graph}, resources) ->
|
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MapSet.union(resources, Graph.resources(graph))
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|
end
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|
end
|
|
|
|
@doc """
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|
All statements within all graphs of a `RDF.Dataset`.
|
|
|
|
# Examples
|
|
|
|
iex> RDF.Dataset.new([
|
|
...> {EX.S1, EX.p1, EX.O1, EX.Graph},
|
|
...> {EX.S2, EX.p2, EX.O2},
|
|
...> {EX.S1, EX.p2, EX.O3}]) |>
|
|
...> RDF.Dataset.statements
|
|
[{RDF.uri(EX.S1), RDF.uri(EX.p1), RDF.uri(EX.O1), RDF.uri(EX.Graph)},
|
|
{RDF.uri(EX.S1), RDF.uri(EX.p2), RDF.uri(EX.O3)},
|
|
{RDF.uri(EX.S2), RDF.uri(EX.p2), RDF.uri(EX.O2)}]
|
|
"""
|
|
def statements(%RDF.Dataset{graphs: graphs}) do
|
|
Enum.reduce graphs, [], fn ({_, graph}, all_statements) ->
|
|
statements = Graph.triples(graph)
|
|
if graph.name do
|
|
Enum.map statements, fn {s, p, o} -> {s, p, o, graph.name} end
|
|
else
|
|
statements
|
|
end ++ all_statements
|
|
end
|
|
end
|
|
|
|
|
|
@doc """
|
|
Returns if a given statement is in a `RDF.Dataset`.
|
|
|
|
# Examples
|
|
|
|
iex> dataset = RDF.Dataset.new([
|
|
...> {EX.S1, EX.p1, EX.O1, EX.Graph},
|
|
...> {EX.S2, EX.p2, EX.O2},
|
|
...> {EX.S1, EX.p2, EX.O3}])
|
|
...> RDF.Dataset.include?(dataset, {EX.S1, EX.p1, EX.O1, EX.Graph})
|
|
true
|
|
"""
|
|
def include?(dataset, statement, graph_context \\ nil)
|
|
|
|
def include?(%RDF.Dataset{graphs: graphs}, triple = {_, _, _}, graph_context) do
|
|
with graph_context = convert_graph_name(graph_context) do
|
|
if graph = graphs[graph_context] do
|
|
Graph.include?(graph, triple)
|
|
else
|
|
false
|
|
end
|
|
end
|
|
end
|
|
|
|
def include?(%RDF.Dataset{} = description,
|
|
{subject, predicate, object, graph_context}, _),
|
|
do: include?(description, {subject, predicate, object}, graph_context)
|
|
|
|
|
|
# TODO: Can/should we isolate and move the Enumerable specific part to the Enumerable implementation?
|
|
|
|
def reduce(%RDF.Dataset{graphs: graphs}, {:cont, acc}, _fun)
|
|
when map_size(graphs) == 0, do: {:done, acc}
|
|
|
|
def reduce(%RDF.Dataset{} = dataset, {:cont, acc}, fun) do
|
|
{statement, rest} = RDF.Dataset.pop(dataset)
|
|
reduce(rest, fun.(statement, acc), fun)
|
|
end
|
|
|
|
def reduce(_, {:halt, acc}, _fun), do: {:halted, acc}
|
|
def reduce(dataset = %RDF.Dataset{}, {:suspend, acc}, fun) do
|
|
{:suspended, acc, &reduce(dataset, &1, fun)}
|
|
end
|
|
|
|
|
|
def pop(%RDF.Dataset{graphs: graphs} = dataset)
|
|
when graphs == %{}, do: {nil, dataset}
|
|
|
|
def pop(%RDF.Dataset{name: name, graphs: graphs}) do
|
|
# # TODO: Find a faster way ...
|
|
[{graph_name, graph}] = Enum.take(graphs, 1)
|
|
{{s, p, o}, popped_graph} = Graph.pop(graph)
|
|
popped = if Enum.empty?(popped_graph),
|
|
do: graphs |> Map.delete(graph_name),
|
|
else: graphs |> Map.put(graph_name, popped_graph)
|
|
|
|
{{s, p, o, graph_name}, %RDF.Dataset{name: name, graphs: popped}}
|
|
end
|
|
|
|
end
|
|
|
|
defimpl Enumerable, for: RDF.Dataset do
|
|
def reduce(graph, acc, fun), do: RDF.Dataset.reduce(graph, acc, fun)
|
|
def member?(graph, statement), do: {:ok, RDF.Dataset.include?(graph, statement)}
|
|
def count(graph), do: {:ok, RDF.Dataset.statement_count(graph)}
|
|
end
|