pulibrary / orangelight / 0e37073d-109c-440c-949f-49d2aa86311b

require 'builder'

module Blacklight

  module Document

    module DublinCore

      def self.extended(document)

        Blacklight::Document::DublinCore.register_export_formats(document)

      end

      def self.register_export_formats(document)

        document.will_export_as(:xml)

        document.will_export_as(:dc_xml, 'text/xml')

        document.will_export_as(:oai_dc_xml, 'text/xml')

        document.will_export_as(:rdf_dc, 'text/xml')

      end

      def dublin_core_field_names

        %i[contributor coverage creator date description format

           identifier language publisher relation rights source

           subject title type]

      end

      def export_as_oai_dc_xml

        xml = Builder::XmlMarkup.new

        xml.tag!('oai_dc:dc',

                 'xmlns:oai_dc' => 'http://www.openarchives.org/OAI/2.0/oai_dc/',

                 'xmlns:dc' => 'http://purl.org/dc/elements/1.1/',

                 'xmlns:xsi' => 'http://www.w3.org/2001/XMLSchema-instance',

                 'xsi:schemaLocation' => %(http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd)) do

          to_semantic_values.select { |field, _values| dublin_core_field_name? field }.each do |field, values|

            Array.wrap(values).each do |v|

              xml.tag! "dc:#{field}", v

            end

          end

        end

        xml.target!

      end

      def export_as_rdf_dc

        xml = Builder::XmlMarkup.new

        xml.tag!('rdf:RDF',

                 'xmlns:rdf' => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#',

                 'xmlns:dc' => 'http://purl.org/dc/elements/1.1/',

                 'xmlns:xsi' => 'http://www.w3.org/2001/XMLSchema-instance') do

          xml.tag!('rdf:Description', 'rdf:about' => "https://catalog.princeton.edu/catalog/#{id}") do

            to_semantic_values.select { |field, _values| dublin_core_field_name? field }.each do |field, values|

              Array.wrap(values).each do |v|

                xml.tag! "dc:#{field}", v

              end

            end

          end

        end

        xml.target!

      end

      alias export_as_xml export_as_oai_dc_xml

      alias export_as_dc_xml export_as_oai_dc_xml

      private

        def dublin_core_field_name?(field)

          dublin_core_field_names.include? field.to_sym

        end

    end

  end

end