fromJson static method

Attributes fromJson(Map<String, dynamic> json)

Creates an Attributes instance from a JSON map. This is a utility method for deserialization from logs or exports.

Implementation

static Attributes fromJson(Map<String, dynamic> json) {
  final attributes = <Attribute<Object>>[];

  for (final entry in json.entries) {
    final key = entry.key;
    final value = entry.value;

    if (value is String) {
      attributes.add(AttributeCreate.create<String>(key, value));
    } else if (value is bool) {
      attributes.add(AttributeCreate.create<bool>(key, value));
    } else if (value is int) {
      attributes.add(AttributeCreate.create<int>(key, value));
    } else if (value is double) {
      attributes.add(AttributeCreate.create<double>(key, value));
    } else if (value is List<String>) {
      attributes.add(AttributeCreate.create<List<String>>(key, value));
    } else if (value is List<bool>) {
      attributes.add(AttributeCreate.create<List<bool>>(key, value));
    } else if (value is List<int>) {
      attributes.add(AttributeCreate.create<List<int>>(key, value));
    } else if (value is List<double>) {
      attributes.add(AttributeCreate.create<List<double>>(key, value));
    } else if (value is List) {
      // Try to convert the list to a supported type
      if (value.isNotEmpty) {
        if (value.every((e) => e is String)) {
          attributes.add(AttributeCreate.create<List<String>>(
              key, value.cast<String>()));
        } else if (value.every((e) => e is bool)) {
          attributes.add(
              AttributeCreate.create<List<bool>>(key, value.cast<bool>()));
        } else if (value.every((e) => e is int)) {
          attributes
              .add(AttributeCreate.create<List<int>>(key, value.cast<int>()));
        } else if (value.every((e) => e is double || e is int)) {
          // Convert all to double
          attributes.add(AttributeCreate.create<List<double>>(
              key,
              value
                  .map((e) => e is int ? e.toDouble() : e as double)
                  .toList()));
        } else {
          OTelErrorHandling.report(ArgumentError(
              'Ignoring attribute $key because the list contains unsupported types. Only String, bool, int, double lists are allowed by the OTel specification.'));
        }
      } else {
        OTelErrorHandling.report(ArgumentError(
            'Ignoring attribute $key because empty lists are not allowed by the OTel specification.'));
      }
    } else {
      OTelErrorHandling.report(ArgumentError(
          'Ignoring attribute $key because the value is not a valid attribute type. Only String, bool, int, double and Lists of those types are allowed by the OTel specification.'));
    }
  }

  return AttributesCreate.create(attributes);
}