ArrowSchema.fromJson constructor

Implementation

factory ArrowSchema.fromJson(Map<String, Object?> json) {
  try {
    final fields = json['fields'];
    if (fields is! List) {
      throw const FormatException('schema.fields must be a list');
    }
    return ArrowSchema(
      fields.indexed
          .map(
            (entry) => ArrowField.fromJson(
              _stringObjectMap(entry.$2, 'schema.fields[${entry.$1}]'),
            ),
          )
          .toList(),
      allowDuplicateNames: true,
      metadata: _metadataFromJson(
        json['metadata'],
        'schema.metadata',
        present: json.containsKey('metadata'),
      ),
    );
  } on FormatException {
    rethrow;
  } on ArgumentError catch (error) {
    throw FormatException('Invalid Arrow schema: $error');
  } on TypeError catch (error) {
    throw FormatException('Invalid Arrow schema shape: $error');
  }
}