Contents

module Voyager
  module Holdings
    class Collection
      attr_reader :records, :xml

      DEFAULT_OPAC_URL = "http://bearberry.cc.columbia.edu:7014/vxws/GetHoldingsService"

      # Invoke GetHoldingsService
      def self.new_from_opac(bibid, url = DEFAULT_OPAC_URL, httpclient = nil)
        conn = Voyager::Connection.new(:http_client => httpclient)
        Collection.new(conn.request(url, :bibId => bibid))
      end

      # Convert raw xml from GetHoldingsService to xml record object
      def initialize(raw_xml)
        @xml = load_and_namespace_xml(raw_xml)
        parse_xml
      end
      
      # Generate output hash from Record class instances
      def to_hash
        output = {}
        output[:records] = @records.collect do |rec|
          rec.to_hash
        end
        output
      end

      private

      # Create xml record object with searchable namespaces
      def load_and_namespace_xml(raw_xml)
        xml = Nokogiri::XML(raw_xml)
        xml.root.add_namespace_definition("hol", "http://www.endinfosys.com/Voyager/holdings")
        xml.root.add_namespace_definition("mfhd", "http://www.endinfosys.com/Voyager/mfhd")
        xml.root.add_namespace_definition("item", "http://www.endinfosys.com/Voyager/item")
        xml.root.add_namespace_definition("slim", "http://www.loc.gov/MARC21/slim")
        return xml
      end

      # Collect Record class instances for each mfhd:mfhdRecord node in xml record objext
      def parse_xml
        @records = @xml.css("hol|mfhdCollection>mfhd|mfhdRecord").collect do |record_node|
          Record.new(record_node)
        end
      end
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
voyager_api-0.1.1	lib/holdings/collection.rb