rdf-ex/lib/rdf/quad.ex

47 lines
1.4 KiB
Elixir

defmodule RDF.Quad do
@moduledoc """
Defines a RDF Quad.
A Quad is a plain Elixir tuple consisting of four valid RDF values for
subject, predicate, object and a graph context.
"""
alias RDF.{BlankNode, Statement}
@doc """
Creates a `RDF.Quad` with proper RDF values.
An error is raised when the given elements are not convertible 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>}
"""
def new(subject, predicate, object, graph_context) do
{
Statement.convert_subject(subject),
Statement.convert_predicate(predicate),
Statement.convert_object(object),
Statement.convert_graph_name(graph_context)
}
end
@doc """
Creates a `RDF.Quad` with proper RDF values.
An error is raised when the given elements are not convertible 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>}
"""
def new({subject, predicate, object, graph_context}),
do: new(subject, predicate, object, graph_context)
end