Index.fromJson constructor

Index.fromJson(Map<String, dynamic> map)

Implementation

factory Index.fromJson(Map<String, dynamic> map) {
  Map<FieldRef, Vector> fieldVectors = {};
  List serializedVectors = map['fieldVectors'];
  InvertedIndex invertedIndex = InvertedIndex();
  List serializedInvertedIndex = map['invertedIndex'];
  TokenSetBuilder tokenSetBuilder = TokenSetBuilder();
  Pipeline pipeline = Pipeline.load(map['pipeline'].cast<String>());

  if (map['version'] != Lunr.version) {
    Utils.warn("Version mismatch when loading serialised index. Current"
        "version of lunr '${Lunr.version}' does not match serialized "
        "index '${map['version']}'");
  }

  for (List tuple in serializedVectors) {
    String ref = tuple[0] as String;
    List<num> elements = tuple[1].cast<num>();
    fieldVectors[FieldRef.fromString(ref)] = Vector(elements);
  }

  for (List tuple in serializedInvertedIndex) {
    String term = tuple[0];
    Posting posting = Posting.fromJson(tuple[1]);

    tokenSetBuilder.insert(term);
    invertedIndex[Token(term)] = posting;
  }
  tokenSetBuilder.finish();

  return Index(
    fields: map['fields'].cast<String>(),
    fieldVectors: fieldVectors,
    invertedIndex: invertedIndex,
    tokenSet: tokenSetBuilder.root,
    pipeline: pipeline,
  );
}