fromJson static method

TimeSeries? fromJson(dynamic value)

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

Implementation

// ignore: prefer_constructors_over_static_methods
static TimeSeries? 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 "TimeSeries[$key]" is missing from JSON.');
        assert(json[key] != null, 'Required key "TimeSeries[$key]" has a null value in JSON.');
      });
      return true;
    }());

    return TimeSeries(
      fields: json[r'fields'] is List ? (json[r'fields'] as List).cast<String>() : const [],
      samples: json[r'samples'] is List
          ? (json[r'samples'] as List).map((e) => e == null ? const <num>[] : (e as List).cast<num>()).toList()
          : const <List<num>>[],
      min: json[r'min'] is List ? (json[r'min'] as List).cast<num>() : const [],
      max: json[r'max'] is List ? (json[r'max'] as List).cast<num>() : const [],
      mean: json[r'mean'] is List ? (json[r'mean'] as List).cast<num>() : const [],
      median: json[r'median'] is List ? (json[r'median'] as List).cast<num>() : const [],
      variance: json[r'variance'] is List ? (json[r'variance'] as List).cast<num>() : const [],
    );
  }
  return null;
}