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POExecuting an overriden method, triggers the un-overridden one
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2013-10-23T15:48:34.273
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With the change to <code>StreamEventTransformer</code>, I have to create a wrapper class that behave like <code>StreamEventTransformer</code>, so here's the code: <pre class="lang-dart prettyprint-override"><code>class Transformer implements EventSink, StreamTransformer { EventSink rootSink; Transformer(); Transformer._useSink(this.rootSink); void handleData(event, EventSink sink) { print('inside handleData'); sink.add(event); } void handleError(error, StackTrace stackTrace, EventSink sink) => sink.addError(error, stackTrace); void add(event) { print('inside add'); handleData(event, rootSink); } void addError(error, [StackTrace stackTrace]) => handleError(error, stackTrace, rootSink); void close() => rootSink.close(); Stream bind(Stream source) => new Stream.eventTransformed(source, (EventSink sink) { EventSink eventSink = new Transformer._useSink(sink); return eventSink; }); } </code></pre> with this class, I just have to extends from <code>Transformer</code> to adapt with the change. But when I extends it: <pre class="lang-dart prettyprint-override"><code>class PlusOneTransformer extends Transformer { void handleData(data, sink) { sink.add(data + 1); } } </code></pre> and test it: <pre class="lang-dart prettyprint-override"><code>void main() { StreamController controller = new StreamController(); Stream stream = controller.stream.transform(new PlusOneTransformer()); stream.listen(print); controller.add(10); } </code></pre> I'm expecting the output is: <pre><code>inside add 11 </code></pre> but instead: <pre><code>inside add inside handleData 10 </code></pre> So it's not running the overridden <code>handleData</code>, it's running the old one. From debugger I can see the executed class is <code>Transformer</code> not <code>PlusOneTransformer</code> while I'm using <code>PlusOneTransformer</code> to transform the stream. Am I missing something?
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Executing an overriden method, triggers the un-overridden one
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