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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 | |
3 // BSD-style license that can be found in the LICENSE file. | |
4 | |
5 library async.result_future; | |
6 | |
7 import 'dart:async'; | |
8 | |
9 import '../result.dart'; | |
10 import 'delegate/future.dart'; | |
11 | |
12 /// A [Future] wrapper that provides synchronous access to the result of the | |
13 /// wrapped [Future] once it's completed. | |
14 class ResultFuture<T> extends DelegatingFuture<T> { | |
Lasse Reichstein Nielsen
2015/07/08 11:01:56
I think I'd prefer if this was not a Future itself
nweiz
2015/07/09 01:18:38
This is designed for the use-case of a class that
Lasse Reichstein Nielsen
2015/07/09 11:18:20
I can see the argument - whether a future is compl
nweiz
2015/07/13 20:05:52
I'd be okay with changing this to just have an [is
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15 /// The wrapped [Future]. | |
16 Future<T> _future; | |
Lasse Reichstein Nielsen
2015/07/09 11:18:20
I don't think this field is used at all.
nweiz
2015/07/13 20:05:52
Done.
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17 | |
18 /// The result of the wrapped [Future], if it's completed. | |
19 /// | |
20 /// If it hasn't completed yet, this will be `null`. | |
21 Result<T> get result => _result; | |
22 Result<T> _result; | |
23 | |
24 factory ResultFuture(Future<T> future) { | |
25 var resultFuture; | |
26 resultFuture = new ResultFuture._(future.then((value) { | |
27 resultFuture._result = new Result.value(value); | |
28 return value; | |
29 }).catchError((error, stackTrace) { | |
30 resultFuture._result = new Result.error(error, stackTrace); | |
31 throw error; | |
32 })); | |
Lasse Reichstein Nielsen
2015/07/08 11:01:57
The `Result.capture(Future future)` can handle thi
nweiz
2015/07/09 01:18:38
Done.
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33 return resultFuture; | |
34 } | |
35 | |
36 ResultFuture._(Future<T> future) | |
37 : super(future); | |
38 } | |
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