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1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file | 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 | 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.dart'; | 7 import '../typed/stream.dart'; |
8 | 8 |
9 /// Simple delegating wrapper around a [Stream]. | 9 /// Simple delegating wrapper around a [Stream]. |
10 /// | 10 /// |
11 /// Subclasses can override individual methods, or use this to expose only the | 11 /// Subclasses can override individual methods, or use this to expose only the |
12 /// [Stream] methods of a subclass. | 12 /// [Stream] methods of a subclass. |
13 /// | 13 /// |
14 /// Note that this is identical to [StreamView] in `dart:async`. It's provided | 14 /// Note that this is identical to [StreamView] in `dart:async`. It's provided |
15 /// under this name for consistency with other `Delegating*` classes. | 15 /// under this name for consistency with other `Delegating*` classes. |
16 class DelegatingStream<T> extends StreamView<T> { | 16 class DelegatingStream<T> extends StreamView<T> { |
17 DelegatingStream(Stream<T> stream) : super(stream); | 17 DelegatingStream(Stream<T> stream) : super(stream); |
18 | 18 |
19 /// Creates a wrapper which throws if [stream]'s events aren't instances of | 19 /// Creates a wrapper which throws if [stream]'s events aren't instances of |
20 /// `T`. | 20 /// `T`. |
21 /// | 21 /// |
22 /// This soundly converts a [Stream] to a `Stream<T>`, regardless of its | 22 /// This soundly converts a [Stream] to a `Stream<T>`, regardless of its |
23 /// original generic type, by asserting that its events are instances of `T` | 23 /// original generic type, by asserting that its events are instances of `T` |
24 /// whenever they're provided. If they're not, the stream throws a | 24 /// whenever they're provided. If they're not, the stream throws a |
25 /// [CastError]. | 25 /// [CastError]. |
26 static Stream/*<T>*/ typed/*<T>*/(Stream stream) => | 26 static Stream<T> typed<T>(Stream stream) => |
27 stream is Stream/*<T>*/ ? stream : new TypeSafeStream/*<T>*/(stream); | 27 stream is Stream<T> ? stream : new TypeSafeStream<T>(stream); |
28 } | 28 } |
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