fromJson static method

Implementation

static LshIndex fromJson(Map<String, Object?> j) {
  final dim = (j['dim'] as num).toInt();
  final nbits = (j['nbits'] as num?)?.toInt() ?? 64;
  final seed = (j['seed'] as num?)?.toInt() ?? 1234;
  final idx = LshIndex(dim, nbits: nbits, seed: seed);
  final ids = (j['ids'] as List).cast<Object?>();
  final codes = base64.decode(j['codes'] as String);
  if (codes.length != ids.length * idx.codeSize) {
    throw FormatException(
      'LshIndex.fromJson: codes length ${codes.length} '
      '!= ids ${ids.length} * codeSize ${idx.codeSize}',
    );
  }
  idx._codes = Uint8List.fromList(codes);
  idx._ids.addAll(ids);
  return idx;
}