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