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import 'dart:async';

class Cake {}

class Order {
  String type;
  Order(this.type);
}

void main() {
  final controller = new StreamController();
  
  final order = new Order('chocolate');
  
  final baker = new StreamTransformer.fromHandlers(
    handleData: (cakeType, sink) {
      if(cakeType == 'chocolate'){
        sink.add(new Cake());
      }
      else {
        sink.addError('I cant take that type');
      }
    }
  );
  
  controller.sink.add(order);
  
  controller.stream
    .map((order) => order.type)
    .transform(baker)
    .listen(
  		(cake) => print('heres your cake: $cake'),
    	onError: (err) => print(err);
  	)
}