Attachment.fromJson constructor

Attachment.fromJson(Map<String, dynamic> json)

Returns an Attachment with a filename and the corresponding data from json.

Throws a JsonMissingKeyException if there is missing one of the needed keys (BrokerKeys.filename, BrokerKeys.data) in the json. Throws a InvalidJsonSchemaException if some values doesn't match the expected value type string.

Implementation

factory Attachment.fromJson(Map<String, dynamic> json) {
  try {
    final Attachment attachment = Attachment()
      ..filename = json.containsKey(BrokerKeys.filename)
          ? json[BrokerKeys.filename] as String
          : throw JsonMissingKeyException(
              BrokerKeys.filename, json.toString())
      ..data = json.containsKey(BrokerKeys.data)
          ? json[BrokerKeys.data] as String
          : throw JsonMissingKeyException(BrokerKeys.data, json.toString());
    return attachment;
  } on TypeError catch (e) {
    throw InvalidJsonSchemaException(
        e.stackTrace.toString(), json.toString());
  }
}