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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) => |
23 future is Future/*<T>*/ ? future : new TypeSafeFuture/*<T>*/(future); | 23 future is Future/*<T>*/ ? future : new TypeSafeFuture/*<T>*/(future); |
24 | 24 |
25 Stream<T> asStream() => _future.asStream(); | 25 Stream<T> asStream() => _future.asStream(); |
26 | 26 |
27 Future catchError(Function onError, {bool test(Object error)}) => | 27 Future<T> catchError(Function onError, {bool test(Object error)}) => |
28 _future.catchError(onError, test: test); | 28 _future.catchError(onError, test: test); |
29 | 29 |
30 Future/*<S>*/ then/*<S>*/(/*=S*/ onValue(T value), {Function onError}) => | 30 Future/*<S>*/ then/*<S>*/(/*=S*/ onValue(T value), {Function onError}) => |
31 _future.then(onValue, onError: onError); | 31 _future.then(onValue, onError: onError); |
32 | 32 |
33 Future<T> whenComplete(action()) => _future.whenComplete(action); | 33 Future<T> whenComplete(action()) => _future.whenComplete(action); |
34 | 34 |
35 Future<T> timeout(Duration timeLimit, {onTimeout()}) => | 35 Future<T> timeout(Duration timeLimit, {onTimeout()}) => |
36 _future.timeout(timeLimit, onTimeout: onTimeout); | 36 _future.timeout(timeLimit, onTimeout: onTimeout); |
37 } | 37 } |
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