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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> { |
| 15 /// Whether the future has fired and [result] is available. |
| 16 bool get isComplete => result != null; |
| 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._(Result.capture(future).then((result) { |
| 27 resultFuture._result = result; |
| 28 return result.asFuture; |
| 29 })); |
| 30 return resultFuture; |
| 31 } |
| 32 |
| 33 ResultFuture._(Future<T> future) |
| 34 : super(future); |
| 35 } |
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