51 lines
1.8 KiB
Elixir
51 lines
1.8 KiB
Elixir
defmodule RDF.Quad do
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@moduledoc """
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Helper functions for RDF quads.
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A RDF Quad is represented as a plain Elixir tuple consisting of four valid
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RDF values for subject, predicate, object and a graph context.
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"""
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alias RDF.Statement
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@doc """
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Creates a `RDF.Quad` with proper RDF values.
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An error is raised when the given elements are not coercible to RDF values.
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Note: The `RDF.quad` function is a shortcut to this function.
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## Examples
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iex> RDF.Quad.new("http://example.com/S", "http://example.com/p", 42, "http://example.com/Graph")
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{~I<http://example.com/S>, ~I<http://example.com/p>, RDF.literal(42), ~I<http://example.com/Graph>}
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iex> RDF.Quad.new(EX.S, EX.p, 42, EX.Graph)
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{RDF.iri("http://example.com/S"), RDF.iri("http://example.com/p"), RDF.literal(42), RDF.iri("http://example.com/Graph")}
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"""
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def new(subject, predicate, object, graph_context) do
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{
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Statement.coerce_subject(subject),
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Statement.coerce_predicate(predicate),
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Statement.coerce_object(object),
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Statement.coerce_graph_name(graph_context)
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}
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end
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@doc """
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Creates a `RDF.Quad` with proper RDF values.
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An error is raised when the given elements are not coercible to RDF values.
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Note: The `RDF.quad` function is a shortcut to this function.
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## Examples
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iex> RDF.Quad.new {"http://example.com/S", "http://example.com/p", 42, "http://example.com/Graph"}
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{~I<http://example.com/S>, ~I<http://example.com/p>, RDF.literal(42), ~I<http://example.com/Graph>}
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iex> RDF.Quad.new {EX.S, EX.p, 42, EX.Graph}
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{RDF.iri("http://example.com/S"), RDF.iri("http://example.com/p"), RDF.literal(42), RDF.iri("http://example.com/Graph")}
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"""
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def new({subject, predicate, object, graph_context}),
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do: new(subject, predicate, object, graph_context)
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end
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