OLD | NEW |
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<T> sink) : _sink = sink; | 17 DelegatingStreamSink(StreamSink<T> sink) : _sink = sink; |
18 | 18 |
19 DelegatingStreamSink._(this._sink); | 19 DelegatingStreamSink._(this._sink); |
20 | 20 |
21 /// Creates a wrapper that coerces the type of [sink]. | 21 /// Creates a wrapper that coerces the type of [sink]. |
22 /// | 22 /// |
23 /// Unlike [new StreamSink], this only requires its argument to be an instance | 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 | 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 | 25 /// throw a [CastError] if the argument type doesn't match the reified type of |
26 /// [sink]. | 26 /// [sink]. |
27 static StreamSink/*<T>*/ typed/*<T>*/(StreamSink sink) => | 27 static StreamSink<T> typed<T>(StreamSink sink) => sink is StreamSink<T> |
28 sink is StreamSink/*<T>*/ ? sink : new DelegatingStreamSink._(sink); | 28 ? sink |
| 29 : new DelegatingStreamSink._(sink); |
29 | 30 |
30 void add(T data) { | 31 void add(T data) { |
31 _sink.add(data); | 32 _sink.add(data); |
32 } | 33 } |
33 | 34 |
34 void addError(error, [StackTrace stackTrace]) { | 35 void addError(error, [StackTrace stackTrace]) { |
35 _sink.addError(error, stackTrace); | 36 _sink.addError(error, stackTrace); |
36 } | 37 } |
37 | 38 |
38 Future addStream(Stream<T> stream) => _sink.addStream(stream); | 39 Future addStream(Stream<T> stream) => _sink.addStream(stream); |
39 | 40 |
40 Future close() => _sink.close(); | 41 Future close() => _sink.close(); |
41 } | 42 } |
OLD | NEW |