fromJson static method

BusMessage? fromJson(dynamic value)

Returns a new BusMessage instance and imports its values from value if it's a Map, null otherwise.

Implementation

// ignore: prefer_constructors_over_static_methods
static BusMessage? fromJson(dynamic value) {
  if (value is Map) {
    final json = value.cast<String, dynamic>();

    // Ensure that the map contains the required keys.
    // Note 1: the values aren't checked for validity beyond being non-null.
    // Note 2: this code is stripped in release mode!
    assert(() {
      requiredKeys.forEach((key) {
        assert(json.containsKey(key), 'Required key "BusMessage[$key]" is missing from JSON.');
        assert(json[key] != null, 'Required key "BusMessage[$key]" has a null value in JSON.');
      });
      return true;
    }());

    return BusMessage(
      data: mapValueOfType<String>(json, r'data'),
      headers: json[r'headers'] == null
        ? const {}
          : (json[r'headers'] as Map).map((k, v) => MapEntry(k as String, v == null ? const <String>[] : (v as List).cast<String>().toList(growable: false))),
      seq: mapValueOfType<int>(json, r'seq'),
      subject: mapValueOfType<String>(json, r'subject'),
      time: mapValueOfType<String>(json, r'time'),
    );
  }
  return null;
}