setEmpty method Null safety

void setEmpty()

Equivalent to setting an empty stream using setSourceStream.

Any one of setSourceStream, setEmpty, and setError may be called at most once. Trying to call any of them again will fail.

Implementation

void setEmpty() {
  if (_stream._isSourceStreamSet) {
    throw StateError('Source stream already set');
  }
  _stream._setEmpty();
}