Contents

require 'rchardet'

module FedoraMigrate
  class RDFDatastreamMover < Mover
    def migrate
      before_rdf_datastream_migration
      migrate_rdf_triples
      after_rdf_datastream_migration
      save
      super
    end

    def migrate_rdf_triples
      target.resource << updated_graph
    end

    private

      def updated_graph
        reader.new(updated_datastream_content)
      end

      def updated_datastream_content
        correct_encoding(datastream_content).gsub(/<.+#{source.pid}>/, "<#{target.uri}>")
      end

      def datastream_content
        source.content
      end

      # Scholarsphere has some ISO-8859 encoded data, which violates the NTriples spec.
      # Here we correct that.
      def correct_encoding(input)
        input.encode!(Encoding::UTF_8)
      rescue Encoding::UndefinedConversionError
        cd = ::CharDet.detect(input)
        input.force_encoding(Encoding.find(cd["encoding"].upcase)).encode!(Encoding::UTF_8)
      end

      def reader
        RDF::Reader.for(:ntriples)
      end
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
fedora-migrate-0.5.0	lib/fedora_migrate/rdf_datastream_mover.rb
fedora-migrate-0.4.0	lib/fedora_migrate/rdf_datastream_mover.rb