findFirst method
Implementation
BodyPart? findFirst(MediaSubtype subtype) {
if (contentType?.mediaType.sub == subtype) {
return this;
}
if (parts?.isNotEmpty ?? false) {
for (final part in parts!) {
final first = part.findFirst(subtype);
if (first != null) {
return first;
}
}
}
return null;
}