blob: 76e02751a832a7b6bc029740747aaa3372ba6108 [file] [log] [blame]
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'dart:async';
import 'result.dart';
import 'value.dart';
/// A result representing a thrown error.
class ErrorResult implements Result<Null> {
/// The error object that was thrown.
final Object error;
/// The stack trace corresponding to where [error] was thrown.
final StackTrace stackTrace;
bool get isValue => false;
bool get isError => true;
ValueResult<Null> get asValue => null;
ErrorResult get asError => this;
ErrorResult(this.error, this.stackTrace);
void complete(Completer completer) {
completer.completeError(error, stackTrace);
void addTo(EventSink sink) {
sink.addError(error, stackTrace);
Future<Null> get asFuture => Future<Null>.error(error, stackTrace);
/// Calls an error handler with the error and stacktrace.
/// An async error handler function is either a function expecting two
/// arguments, which will be called with the error and the stack trace, or it
/// has to be a function expecting only one argument, which will be called
/// with only the error.
void handle(Function errorHandler) {
if (errorHandler is ZoneBinaryCallback) {
errorHandler(error, stackTrace);
} else {
int get hashCode => error.hashCode ^ stackTrace.hashCode ^ 0x1d61823f;
/// This is equal only to an error result with equal [error] and [stackTrace].
bool operator ==(Object other) =>
other is ErrorResult &&
error == other.error &&
stackTrace == other.stackTrace;