Class: Ldp::Resource::RdfSource

Inherits:
Ldp::Resource show all
Defined in:
lib/ldp/resource/rdf_source.rb

Direct Known Subclasses

Container

Instance Attribute Summary

Attributes inherited from Ldp::Resource

#client, #subject

Instance Method Summary collapse

Methods inherited from Ldp::Resource

#current?, #delete, for, #get, #head, #new?, #reload, #retrieved_content?, #save, #subject_uri, #update, #update_cached_get

Constructor Details

#initialize(client, subject, graph_or_response = nil, base_path = '') ⇒ RdfSource

Returns a new instance of RdfSource.



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# File 'lib/ldp/resource/rdf_source.rb', line 4

def initialize client, subject, graph_or_response = nil, base_path = ''
  super

  case graph_or_response
  when RDF::Enumerable
    @graph = graph_or_response
  when Ldp::Response
    # no-op
    nil
  when NilClass
    # no-op
    nil
  else
    raise ArgumentError, "Third argument to #{self.class}.new should be a RDF::Enumerable or a Ldp::Response. You provided #{graph_or_response.class}"
  end
end

Instance Method Details

#build_empty_graph ⇒ Object 



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# File 'lib/ldp/resource/rdf_source.rb', line 45

def build_empty_graph
  graph_class.new
end

#content ⇒ Object 



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# File 'lib/ldp/resource/rdf_source.rb', line 27

def content
  graph.dump(:ttl) if graph
end

#create ⇒ Object 



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# File 'lib/ldp/resource/rdf_source.rb', line 21

def create
  super do |req|
    req.headers["Content-Type"] = "text/turtle"
  end
end

#graph ⇒ Object 



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# File 'lib/ldp/resource/rdf_source.rb', line 31

def graph
  @graph ||= begin
               if subject.nil?
                 build_empty_graph
               else
                 filtered_graph(response_graph)
               end
             rescue Ldp::NotFound
               # This is an optimization that lets us avoid doing HEAD + GET
               # when the object exists. We just need to handle the 404 case
               build_empty_graph
             end
end

#graph_class ⇒ Class

graph_class may be overridden so that a subclass of RDF::Graph is returned (e.g. an ActiveTriples resource)

Returns:

  • (Class) —

    a class that is an descendant of RDF::Graph



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# File 'lib/ldp/resource/rdf_source.rb', line 53

def graph_class
  RDF::Graph
end

#response_graph ⇒ RDF::Graph

Parse the graph returned by the LDP server into an RDF::Graph

Returns:

  • (RDF::Graph) 


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# File 'lib/ldp/resource/rdf_source.rb', line 60

def response_graph
  @response_graph ||= response_as_graph(get)
end