79 lines
2.4 KiB
Elixir
79 lines
2.4 KiB
Elixir
defprotocol RDF.Data do
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@moduledoc """
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An abstraction over the different data structures for collections of RDF statements.
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"""
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@doc """
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Deletes statements from a RDF data structure.
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"""
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def delete(data, statements)
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@doc """
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Deletes one statement from a RDF data structure and returns a tuple with deleted statement and the changed data structure.
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"""
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def pop(data)
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@doc """
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Checks if the given statement exists within a RDF data structure.
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"""
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def include?(data, statements)
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@doc """
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Returns the list of all statements of a RDF data structure.
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"""
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def statements(data)
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@doc """
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Returns the set of all resources which are subject of the statements of a RDF data structure.
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"""
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def subjects(data)
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@doc """
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Returns the set of all properties used within the statements of RDF data structure.
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"""
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def predicates(data)
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@doc """
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Returns the set of all resources used in the objects within the statements of a RDF data structure.
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"""
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def objects(data)
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@doc """
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Returns the set of all resources used within the statements of a RDF data structure
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"""
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def resources(data)
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@doc """
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Returns the count of all resources which are subject of the statements of a RDF data structure.
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"""
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def subject_count(data)
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@doc """
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Returns the count of all statements of a RDF data structure.
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"""
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def statement_count(data)
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end
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defimpl RDF.Data, for: RDF.Description do
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def delete(%RDF.Description{subject: subject} = description,
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%RDF.Description{subject: other_subject})
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when subject != other_subject,
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do: description
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def delete(description, statements), do: RDF.Description.delete(description, statements)
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def pop(description), do: RDF.Description.pop(description)
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def include?(description, statements),
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do: RDF.Description.include?(description, statements)
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def statements(description), do: RDF.Description.statements(description)
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def predicates(description), do: RDF.Description.predicates(description)
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def objects(description), do: RDF.Description.objects(description)
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def subjects(%RDF.Description{subject: subject}), do: MapSet.new([subject])
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def resources(%RDF.Description{subject: subject} = description),
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do: RDF.Description.resources(description) |> MapSet.put(subject)
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def subject_count(_), do: 1
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def statement_count(description), do: RDF.Description.count(description)
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end
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