Contents

module Ldp
  class Resource::RdfSource < Ldp::Resource

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

      case graph_or_response
        when RDF::Graph
          @graph = graph_or_response
        when Ldp::Response
        when NilClass
          #nop
        else
          raise ArgumentError, "Third argument to #{self.class}.new should be a RDF::Graph or a Ldp::Response. You provided #{graph_or_response.class}"
      end
    end

    def create
      super do |req|
        req.headers = { "Content-Type" => "text/turtle" }
      end
    end

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

    def graph
      @graph ||= new? ? build_empty_graph : build_graph(get.graph)
    end

    def build_empty_graph
      graph_class.new
    end

    ##
    # 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
    def graph_class
      RDF::Graph
    end



    private

      ##
      # @param [RDF::Graph] original_graph The graph returned by the LDP server
      # @return [RDF::Graph] A graph striped of any inlined resources present in the original
      def build_graph(original_graph)
        inlined_resources = get.graph.query(predicate: Ldp.contains).map { |x| x.object }

        # we want to scope this graph to just statements about this model, not contained relations
        if inlined_resources.empty?
          original_graph
        else
          graph_without_inlined_resources(original_graph, inlined_resources)
        end
      end

      def graph_without_inlined_resources(original_graph, inlined_resources)
        new_graph = build_empty_graph

        original_graph.each_statement do |s|
          unless inlined_resources.include? s.subject
            new_graph << s
          end
        end

        new_graph
      end
  end
end

Version data entries

7 entries across 7 versions & 1 rubygems

Version	Path
ldp-0.2.2	lib/ldp/resource/rdf_source.rb
ldp-0.2.1	lib/ldp/resource/rdf_source.rb
ldp-0.2.0	lib/ldp/resource/rdf_source.rb
ldp-0.1.0	lib/ldp/resource/rdf_source.rb
ldp-0.0.10	lib/ldp/resource/rdf_source.rb
ldp-0.0.9	lib/ldp/resource/rdf_source.rb
ldp-0.0.8	lib/ldp/resource/rdf_source.rb