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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/future.dart'; | 7 import '../typed/future.dart'; |
8 | 8 |
9 /// A wrapper that forwards calls to a [Future]. | 9 /// A wrapper that forwards calls to a [Future]. |
10 class DelegatingFuture<T> implements Future<T> { | 10 class DelegatingFuture<T> implements Future<T> { |
11 /// The wrapped [Future]. | 11 /// The wrapped [Future]. |
12 final Future<T> _future; | 12 final Future<T> _future; |
13 | 13 |
14 DelegatingFuture(this._future); | 14 DelegatingFuture(this._future); |
15 | 15 |
16 /// Creates a wrapper which throws if [future]'s value isn't an instance of | 16 /// Creates a wrapper which throws if [future]'s value isn't an instance of |
17 /// `T`. | 17 /// `T`. |
18 /// | 18 /// |
19 /// This soundly converts a [Future] to a `Future<T>`, regardless of its | 19 /// This soundly converts a [Future] to a `Future<T>`, regardless of its |
20 /// original generic type, by asserting that its value is an instance of `T` | 20 /// original generic type, by asserting that its value is an instance of `T` |
21 /// whenever it's provided. If it's not, the future throws a [CastError]. | 21 /// whenever it's provided. If it's not, the future throws a [CastError]. |
22 static Future/*<T>*/ typed/*<T>*/(Future future) => | 22 static Future<T> typed<T>(Future future) => future is Future<T> |
23 future is Future/*<T>*/ ? future : new TypeSafeFuture/*<T>*/(future); | 23 ? future |
24 : new TypeSafeFuture<T>(future); | |
24 | 25 |
25 Stream<T> asStream() => _future.asStream(); | 26 Stream<T> asStream() => _future.asStream(); |
26 | 27 |
27 Future<T> catchError(Function onError, {bool test(Object error)}) => | 28 Future<T> catchError(Function onError, {bool test(Object error)}) => |
28 _future.catchError(onError, test: test); | 29 _future.catchError(onError, test: test); |
29 | 30 |
30 Future/*<S>*/ then/*<S>*/(dynamic onValue(T value), {Function onError}) => | 31 Future<S> then<S>(dynamic onValue(T value), {Function onError}) => _future |
nweiz
2017/01/31 22:28:58
Putting [_future] way out on the right seems less
Lasse Reichstein Nielsen
2017/02/01 06:51:37
I just ran dartfmt on all changed files, I didn't
nweiz
2017/02/01 20:41:29
Unless we're going to adopt a policy of always aut
| |
31 _future.then(onValue, onError: onError); | 32 .then(onValue, onError: onError); |
32 | 33 |
33 Future<T> whenComplete(action()) => _future.whenComplete(action); | 34 Future<T> whenComplete(action()) => _future.whenComplete(action); |
34 | 35 |
35 Future<T> timeout(Duration timeLimit, {onTimeout()}) => | 36 Future<T> timeout(Duration timeLimit, {onTimeout()}) => |
36 _future.timeout(timeLimit, onTimeout: onTimeout); | 37 _future.timeout(timeLimit, onTimeout: onTimeout); |
37 } | 38 } |
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