Specs

map(t(), RDF.Statement.term_mapping()) :: t_values() | nil

Returns a tuple where each element from a RDF.Quad is mapped with the given function.

Returns nil if one of the components of the given tuple is not convertible via RDF.Term.value/1.

The function fun will receive a tuple {statement_position, rdf_term} where statement_position is one of the atoms :subject, :predicate, :object or :graph_name while rdf_term is the RDF term to be mapped. When the given function returns nil this will be interpreted as an error and will become the overhaul result of the map/2 call.

Examples

iex> {~I<http://example.com/S>, ~I<http://example.com/p>, RDF.literal(42), ~I<http://example.com/Graph>}
...> |> RDF.Quad.map(fn
...>      {:object, object} ->
...>        RDF.Term.value(object)
...>      {:graph_name, graph_name} ->
...>        graph_name
...>      {_, resource} ->
...>        resource |> to_string() |> String.last() |> String.to_atom()
...>    end)
{:S, :p, 42, ~I<http://example.com/Graph>}

Specs

new(RDF.Statement.coercible_t(), RDF.PropertyMap.t() | nil) :: t()

Creates a RDF.Quad with proper RDF values.

An error is raised when the given elements are not coercible to RDF values.

Note: The RDF.quad function is a shortcut to this function.

Examples

iex> RDF.Quad.new {"http://example.com/S", "http://example.com/p", 42, "http://example.com/Graph"}
{~I<http://example.com/S>, ~I<http://example.com/p>, RDF.literal(42), ~I<http://example.com/Graph>}

iex> RDF.Quad.new {EX.S, EX.p, 42, EX.Graph}
{RDF.iri("http://example.com/S"), RDF.iri("http://example.com/p"), RDF.literal(42), RDF.iri("http://example.com/Graph")}

iex> RDF.Quad.new {EX.S, EX.p, 42}
{RDF.iri("http://example.com/S"), RDF.iri("http://example.com/p"), RDF.literal(42), nil}

iex> RDF.Quad.new {EX.S, :p, 42, EX.Graph}, RDF.PropertyMap.new(p: EX.p)
{RDF.iri("http://example.com/S"), RDF.iri("http://example.com/p"), RDF.literal(42), RDF.iri("http://example.com/Graph")}

Specs

new(
  RDF.Statement.coercible_subject(),
  RDF.Statement.coercible_predicate(),
  RDF.Statement.coercible_object(),
  RDF.Statement.coercible_graph_name(),
  RDF.PropertyMap.t() | nil
) :: t()

Creates a RDF.Quad with proper RDF values.

An error is raised when the given elements are not coercible to RDF values.

Note: The RDF.quad function is a shortcut to this function.

Examples

iex> RDF.Quad.new("http://example.com/S", "http://example.com/p", 42, "http://example.com/Graph")
{~I<http://example.com/S>, ~I<http://example.com/p>, RDF.literal(42), ~I<http://example.com/Graph>}

iex> RDF.Quad.new(EX.S, EX.p, 42, EX.Graph)
{RDF.iri("http://example.com/S"), RDF.iri("http://example.com/p"), RDF.literal(42), RDF.iri("http://example.com/Graph")}

iex> RDF.Quad.new(EX.S, :p, 42, EX.Graph, RDF.PropertyMap.new(p: EX.p))
{RDF.iri("http://example.com/S"), RDF.iri("http://example.com/p"), RDF.literal(42), RDF.iri("http://example.com/Graph")}

Specs

valid?(t() | any()) :: boolean()

Checks if the given tuple is a valid RDF quad.

The elements of a valid RDF quad must be RDF terms. On the subject position only IRIs and blank nodes allowed, while on the predicate and graph name position only IRIs allowed. The object position can be any RDF term.

Specs

values(t(), keyword()) :: t_values() | nil

Returns a tuple of native Elixir values from a RDF.Quad of RDF terms.

When a :context option is given with a RDF.PropertyMap, predicates will be mapped to the terms defined in the RDF.PropertyMap, if present.

Returns nil if one of the components of the given tuple is not convertible via RDF.Term.value/1.

Examples

iex> RDF.Quad.values {~I<http://example.com/S>, ~I<http://example.com/p>, RDF.literal(42), ~I<http://example.com/Graph>}
{"http://example.com/S", "http://example.com/p", 42, "http://example.com/Graph"}

iex> {~I<http://example.com/S>, ~I<http://example.com/p>, RDF.literal(42), ~I<http://example.com/Graph>}
...> |> RDF.Quad.values(context: %{p: ~I<http://example.com/p>})
{"http://example.com/S", :p, 42,  "http://example.com/Graph"}