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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 /// Simple delegating wrapper around a [StreamSink]. | 7 /// Simple delegating wrapper around a [StreamSink]. |
8 /// | 8 /// |
9 /// Subclasses can override individual methods, or use this to expose only the | 9 /// Subclasses can override individual methods, or use this to expose only the |
10 /// [StreamSink] methods of a subclass. | 10 /// [StreamSink] methods of a subclass. |
11 class DelegatingStreamSink<T> implements StreamSink<T> { | 11 class DelegatingStreamSink<T> implements StreamSink<T> { |
12 final StreamSink _sink; | 12 final StreamSink _sink; |
13 | 13 |
14 Future get done => _sink.done; | 14 Future get done => _sink.done; |
15 | 15 |
16 /// Create delegating sink forwarding calls to [sink]. | 16 /// Create delegating sink forwarding calls to [sink]. |
17 DelegatingStreamSink(StreamSink sink) | 17 DelegatingStreamSink(StreamSink<T> sink) : _sink = sink; |
18 : _sink = sink; | 18 |
| 19 DelegatingStreamSink._(this._sink); |
| 20 |
| 21 /// Creates a wrapper that coerces the type of [sink]. |
| 22 /// |
| 23 /// Unlike [new StreamSink], this only requires its argument to be an instance |
| 24 /// of `StreamSink`, not `StreamSink<T>`. This means that calls to [add] may |
| 25 /// throw a [CastError] if the argument type doesn't match the reified type of |
| 26 /// [sink]. |
| 27 static StreamSink/*<T>*/ typed/*<T>*/(StreamSink sink) => |
| 28 sink is StreamSink/*<T>*/ ? sink : new DelegatingStreamSink._(sink); |
19 | 29 |
20 void add(T data) { | 30 void add(T data) { |
21 _sink.add(data); | 31 _sink.add(data); |
22 } | 32 } |
23 | 33 |
24 void addError(error, [StackTrace stackTrace]) { | 34 void addError(error, [StackTrace stackTrace]) { |
25 _sink.addError(error, stackTrace); | 35 _sink.addError(error, stackTrace); |
26 } | 36 } |
27 | 37 |
28 Future addStream(Stream<T> stream) => _sink.addStream(stream); | 38 Future addStream(Stream<T> stream) => _sink.addStream(stream); |
29 | 39 |
30 Future close() => _sink.close(); | 40 Future close() => _sink.close(); |
31 } | 41 } |
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