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Side by Side Diff: lib/src/result/error.dart

Issue 1777453002: Modernize the package's style. (Closed) Base URL: git@github.com:dart-lang/async.git@master
Patch Set: Created 4 years, 9 months ago
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1 // Copyright (c) 2016, 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 import 'dart:async';
6
7 import '../result.dart';
8 import 'value.dart';
9
10 /// A result representing a thrown error.
11 class ErrorResult implements Result {
12 final error;
13 final StackTrace stackTrace;
14
15 bool get isValue => false;
16 bool get isError => true;
17 ValueResult get asValue => null;
18 ErrorResult get asError => this;
19
20 ErrorResult(this.error, this.stackTrace);
21
22 void complete(Completer completer) {
23 completer.completeError(error, stackTrace);
24 }
25
26 void addTo(EventSink sink) {
27 sink.addError(error, stackTrace);
28 }
29
30 Future get asFuture => new Future.error(error, stackTrace);
31
32 /// Calls an error handler with the error and stacktrace.
33 ///
34 /// An async error handler function is either a function expecting two
35 /// arguments, which will be called with the error and the stack trace, or it
36 /// has to be a function expecting only one argument, which will be called
37 /// with only the error.
38 void handle(Function errorHandler) {
39 if (errorHandler is ZoneBinaryCallback) {
40 errorHandler(error, stackTrace);
41 } else {
42 errorHandler(error);
43 }
44 }
45 }
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