LCOV - code coverage report
Current view: top level - async-1.13.3/lib/src - single_subscription_transformer.dart (source / functions) Hit Total Coverage
Test: coverage.lcov Lines: 0 9 0.0 %
Date: 2017-10-10 20:17:03 Functions: 0 0 -

          Line data    Source code
       1             : // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
       2             : // for details. All rights reserved. Use of this source code is governed by a
       3             : // BSD-style license that can be found in the LICENSE file.
       4             : 
       5             : import 'dart:async';
       6             : 
       7             : /// A transformer that converts a broadcast stream into a single-subscription
       8             : /// stream.
       9             : ///
      10             : /// This buffers the broadcast stream's events, which means that it starts
      11             : /// listening to a stream as soon as it's bound.
      12             : ///
      13             : /// This also casts the source stream's events to type `T`. If the cast fails,
      14             : /// the result stream will emit a [CastError]. This behavior is deprecated, and
      15             : /// should not be relied upon.
      16             : class SingleSubscriptionTransformer<S, T> implements StreamTransformer<S, T> {
      17           0 :   const SingleSubscriptionTransformer();
      18             : 
      19             :   Stream<T> bind(Stream<S> stream) {
      20             :     var subscription;
      21           0 :     var controller = new StreamController<T>(
      22           0 :         sync: true, onCancel: () => subscription.cancel());
      23           0 :     subscription = stream.listen((value) {
      24             :       // TODO(nweiz): When we release a new major version, get rid of the second
      25             :       // type parameter and avoid this conversion.
      26             :       try {
      27           0 :         controller.add(value as T);
      28           0 :       } on CastError catch (error, stackTrace) {
      29           0 :         controller.addError(error, stackTrace);
      30             :       }
      31           0 :     }, onError: controller.addError, onDone: controller.close);
      32           0 :     return controller.stream;
      33             :   }
      34             : }

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