Class: Lutaml::Turtle::Transform

Inherits:
Rdf::Transform show all
Defined in:
lib/lutaml/turtle/transform.rb

Constant Summary

Constants inherited from Model::Transform

Model::Transform::MAX_CACHE_SIZE

Instance Attribute Summary

Attributes inherited from Model::Transform

#context, #lutaml_register

Instance Method Summary collapse

Methods inherited from Model::Transform

#attributes, cache_size, cached_transform, clear_cache!, data_to_model, #initialize, #model_class, model_to_data

Constructor Details

This class inherits a constructor from Lutaml::Model::Transform

Instance Method Details

#data_to_model(data, _format, options = {}) ⇒ Object 



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# File 'lib/lutaml/turtle/transform.rb', line 27

def data_to_model(data, _format, options = {})
  require "rdf/turtle"
  mapping = extract_turtle_mapping(options)
  unless mapping&.rdf_subject
    raise MissingSubjectError,
          "Turtle mapping requires a subject block"
  end

  graph = data.is_a?(RDF::Graph) ? data : Lutaml::Turtle::Adapter.parse(data)
  attrs = extract_attributes(graph, mapping)
  build_instance(attrs, options)
end

#model_to_data(instance, _format, options = {}) ⇒ Object 



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# File 'lib/lutaml/turtle/transform.rb', line 8

def model_to_data(instance, _format, options = {})
  require "rdf/turtle"
  mapping = extract_turtle_mapping(options)
  return "" unless mapping

  if !mapping.rdf_subject && mapping.rdf_predicates.any? && mapping.rdf_members.empty?
    raise MissingSubjectError,
          "Turtle mapping requires a subject block"
  end

  graph = build_graph(mapping, instance)
  return "" if graph.empty?

  prefixes = build_prefixes(mapping, instance)
  RDF::Turtle::Writer.buffer(prefixes: prefixes) do |writer|
    graph.each_statement { |stmt| writer << stmt }
  end.strip
end