Module: BBC::Programmes

Defined in:
lib/bbc/programmes.rb,
lib/bbc/programmes/base.rb,
lib/bbc/programmes/brand.rb,
lib/bbc/programmes/series.rb,
lib/bbc/programmes/episode.rb,
lib/bbc/programmes/segment.rb,
lib/bbc/programmes/service.rb,
lib/bbc/programmes/version.rb,
lib/bbc/programmes/broadcast.rb,
lib/bbc/programmes/programme.rb,
lib/bbc/programmes/time_line.rb,
lib/bbc/programmes/time_interval.rb

Defined Under Namespace

Classes: Base, Brand, Broadcast, Episode, Programme, Segment, Series, Service, TimeInterval, TimeLine, Version

Constant Summary collapse

BASE_URI = 
'http://www.bbc.co.uk/programmes'
USER_AGENT = 
"bbc-programmes-ruby/0.1"

Class Method Summary collapse

Class Method Details

.fetch(identifier) ⇒ Object

Load a subject into the local repository



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# File 'lib/bbc/programmes.rb', line 75

def self.fetch(identifier)
  unless identifier.is_a?(RDF::URI)
    identifier = RDF::URI("#{BASE_URI}/#{identifier}")
  end

  graph = self.http_get_graph(identifier)

  type = graph.first_object([identifier, RDF.type, nil])
  raise "No type found for #{identifier}" if type.nil?

  klass = BBC::Programmes::Base.subclasses.find { |k| k.type == type }
  raise "No class found for #{identifier} of type #{type}" if klass.nil?

  # Add the graph to the repository of the type
  graph.each_statement do |s|
    klass.repository << s
  end

  klass.for(identifier)
end

.http_get_graph(uri) ⇒ Object

Fetches and returns a Graph for an identifier



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# File 'lib/bbc/programmes.rb', line 46

def self.http_get_graph(uri)
  uri = RDF::URI(uri) unless uri.is_a?(RDF::URI)

  # FIXME: support other HTTP libraries too
  res = Net::HTTP.start(uri.host, uri.port) do |http|
    http.get(uri.request_uri, {
      'User-Agent' => USER_AGENT,
      'Accept' => 'application/rdf+xml'
    })
  end

  # Throw an exception if it failed
  res.value

  # Find a reader for the content type returned
  reader_class = RDF::Reader.for(:content_type => res.content_type)
  raise "No reader found for parsing: #{res.content_type}" if reader_class.nil?

  # Parse the RDF
  RDF::Graph.new(uri) do |graph|
    reader_class.new(res.body, :base_uri => uri) do |reader|
      reader.each_statement do |statement|
        graph << statement
      end
    end
  end
end

.search(keywords) ⇒ Object 



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# File 'lib/bbc/programmes.rb', line 30

def self.search(keywords)
  encoded = Addressable::URI.encode(keywords)
  graph = http_get_graph("#{BASE_URI}/a-z/by/#{encoded}/all.rdf")

  # FIXME: push graph into the repository?

  programmes = []
  graph.query([nil, RDF.type, RDF::PO.Programme]) do |s|
    programme = Programme.for(s.subject)
    programme.title = graph.first_literal([s.subject, RDF::DC11.title, nil])
    programmes << programme
  end
  programmes
end