movieWithUserDataToTurtleOntology static method

Implementation

static String movieWithUserDataToTurtleOntology(
    Movie movie, double? rating, String? comment) {
  final triples = <URIRef, Map<URIRef, dynamic>>{};

  // Create the movie resource with all movie metadata.

  final movieResource = moviestarDataNS.withAttr('movie-${movie.id}');
  triples[movieResource] = {
    rdfType: [owlNS.withAttr('NamedIndividual'), movieType],
    identifier:
        Literal('${movie.id}', datatype: xsdNS.withAttr('positiveInteger')),
    name: Literal(_escapeAndSanitizeString(movie.title)),
    description: Literal(_escapeAndSanitizeString(movie.overview)),
    image: Literal(_escapeAndSanitizeString(movie.posterUrl),
        datatype: xsdNS.withAttr('anyURI')),
    thumbnailUrl: Literal(_escapeAndSanitizeString(movie.backdropUrl),
        datatype: xsdNS.withAttr('anyURI')),
    aggregateRating:
        Literal('${movie.voteAverage}', datatype: xsdNS.withAttr('double')),
    datePublished: Literal(movie.releaseDate.toIso8601String(),
        datatype: xsdNS.withAttr('date')),
    genre: Literal(movie.genreIds.join(',')),
    rdfsLabel: Literal('|name=${_escapeAndSanitizeString(movie.title)}|'),
  };

  // Add user's personal rating if it exists.

  if (rating != null) {
    triples[movieResource]![contentRating] =
        Literal('$rating', datatype: xsdNS.withAttr('double'));
  }

  // Add user's personal comment if it exists.

  if (comment != null && comment.isNotEmpty) {
    triples[movieResource]![TurtleSerializer.comment] =
        Literal(_escapeAndSanitizeString(comment));
  }

  // Add JSON backup for compatibility.
  final movieJson = jsonEncode(movie.toJson());
  final userDataJson = jsonEncode({
    'rating': rating,
    'comment': comment,
  });

  // Use ontology-compliant namespace bindings.
  final ttlContent =
      tripleMapToTurtle(triples, bindNamespaces: _getOntologyNamespaces());
  final withJsonBackup =
      '$ttlContent\n\n# JSON_MOVIE_DATA: $movieJson\n# JSON_USER_DATA: $userDataJson';

  return withJsonBackup;
}