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| 1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a | 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. | 3 // BSD-style license that can be found in the LICENSE file. |
| 4 | 4 |
| 5 import 'dart:async'; | 5 import 'dart:async'; |
| 6 | 6 |
| 7 import '../typed/stream_subscription.dart'; | 7 import '../typed/stream_subscription.dart'; |
| 8 | 8 |
| 9 /// Simple delegating wrapper around a [StreamSubscription]. | 9 /// Simple delegating wrapper around a [StreamSubscription]. |
| 10 /// | 10 /// |
| 11 /// Subclasses can override individual methods. | 11 /// Subclasses can override individual methods. |
| 12 class DelegatingStreamSubscription<T> implements StreamSubscription<T> { | 12 class DelegatingStreamSubscription<T> implements StreamSubscription<T> { |
| 13 final StreamSubscription _source; | 13 final StreamSubscription _source; |
| 14 | 14 |
| 15 /// Create delegating subscription forwarding calls to [sourceSubscription]. | 15 /// Create delegating subscription forwarding calls to [sourceSubscription]. |
| 16 DelegatingStreamSubscription(StreamSubscription<T> sourceSubscription) | 16 DelegatingStreamSubscription(StreamSubscription<T> sourceSubscription) |
| 17 : _source = sourceSubscription; | 17 : _source = sourceSubscription; |
| 18 | 18 |
| 19 /// Creates a wrapper which throws if [subscription]'s events aren't instances | 19 /// Creates a wrapper which throws if [subscription]'s events aren't instances |
| 20 /// of `T`. | 20 /// of `T`. |
| 21 /// | 21 /// |
| 22 /// This soundly converts a [StreamSubscription] to a `StreamSubscription<T>`, | 22 /// This soundly converts a [StreamSubscription] to a `StreamSubscription<T>`, |
| 23 /// regardless of its original generic type, by asserting that its events are | 23 /// regardless of its original generic type, by asserting that its events are |
| 24 /// instances of `T` whenever they're provided. If they're not, the | 24 /// instances of `T` whenever they're provided. If they're not, the |
| 25 /// subscription throws a [CastError]. | 25 /// subscription throws a [CastError]. |
| 26 static StreamSubscription/*<T>*/ typed/*<T>*/( | 26 static StreamSubscription<T> typed<T>(StreamSubscription subscription) => |
| 27 StreamSubscription subscription) => | 27 subscription is StreamSubscription<T> |
| 28 subscription is StreamSubscription/*<T>*/ | |
| 29 ? subscription | 28 ? subscription |
| 30 : new TypeSafeStreamSubscription/*<T>*/(subscription); | 29 : new TypeSafeStreamSubscription<T>(subscription); |
| 31 | 30 |
| 32 void onData(void handleData(T data)) { | 31 void onData(void handleData(T data)) { |
| 33 _source.onData(handleData); | 32 _source.onData(handleData); |
| 34 } | 33 } |
| 35 | 34 |
| 36 void onError(Function handleError) { | 35 void onError(Function handleError) { |
| 37 _source.onError(handleError); | 36 _source.onError(handleError); |
| 38 } | 37 } |
| 39 | 38 |
| 40 void onDone(void handleDone()) { | 39 void onDone(void handleDone()) { |
| 41 _source.onDone(handleDone); | 40 _source.onDone(handleDone); |
| 42 } | 41 } |
| 43 | 42 |
| 44 void pause([Future resumeFuture]) { | 43 void pause([Future resumeFuture]) { |
| 45 _source.pause(resumeFuture); | 44 _source.pause(resumeFuture); |
| 46 } | 45 } |
| 47 | 46 |
| 48 void resume() { | 47 void resume() { |
| 49 _source.resume(); | 48 _source.resume(); |
| 50 } | 49 } |
| 51 | 50 |
| 52 Future cancel() => _source.cancel(); | 51 Future cancel() => _source.cancel(); |
| 53 | 52 |
| 54 Future/*<E>*/ asFuture/*<E>*/([/*=E*/ futureValue]) => | 53 Future<E> asFuture<E>([E futureValue]) => _source.asFuture(futureValue); |
| 55 _source.asFuture(futureValue); | |
| 56 | 54 |
| 57 bool get isPaused => _source.isPaused; | 55 bool get isPaused => _source.isPaused; |
| 58 } | 56 } |
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