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1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file | 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 | 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 '../stream_sink_transformer.dart'; | 7 import '../stream_sink_transformer.dart'; |
8 import '../delegate/stream_sink.dart'; | 8 import '../delegate/stream_sink.dart'; |
9 | 9 |
10 /// The type of the callback for handling data events. | 10 /// The type of the callback for handling data events. |
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47 final StreamSink<T> _safeCloseInner; | 47 final StreamSink<T> _safeCloseInner; |
48 | 48 |
49 Future get done => _inner.done; | 49 Future get done => _inner.done; |
50 | 50 |
51 _HandlerSink(this._transformer, StreamSink<T> inner) | 51 _HandlerSink(this._transformer, StreamSink<T> inner) |
52 : _inner = inner, | 52 : _inner = inner, |
53 _safeCloseInner = new _SafeCloseSink<T>(inner); | 53 _safeCloseInner = new _SafeCloseSink<T>(inner); |
54 | 54 |
55 void add(S event) { | 55 void add(S event) { |
56 if (_transformer._handleData == null) { | 56 if (_transformer._handleData == null) { |
57 // [event] is an S and [_inner.add] takes a T. This style of conversion | 57 _inner.add(event as T); |
58 // will throw an error in checked mode if [_inner] is actually a | |
59 // [StreamSink<T>], but will work if [_inner] isn't reified and won't add | |
60 // an extra check in unchecked mode. | |
61 _inner.add(event as dynamic); | |
62 } else { | 58 } else { |
63 _transformer._handleData(event, _safeCloseInner); | 59 _transformer._handleData(event, _safeCloseInner); |
64 } | 60 } |
65 } | 61 } |
66 | 62 |
67 void addError(error, [StackTrace stackTrace]) { | 63 void addError(error, [StackTrace stackTrace]) { |
68 if (_transformer._handleError == null) { | 64 if (_transformer._handleError == null) { |
69 _inner.addError(error, stackTrace); | 65 _inner.addError(error, stackTrace); |
70 } else { | 66 } else { |
71 _transformer._handleError(error, stackTrace, _safeCloseInner); | 67 _transformer._handleError(error, stackTrace, _safeCloseInner); |
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96 class _SafeCloseSink<T> extends DelegatingStreamSink<T> { | 92 class _SafeCloseSink<T> extends DelegatingStreamSink<T> { |
97 _SafeCloseSink(StreamSink<T> inner) : super(inner); | 93 _SafeCloseSink(StreamSink<T> inner) : super(inner); |
98 | 94 |
99 Future close() => super.close().catchError((_) {}); | 95 Future close() => super.close().catchError((_) {}); |
100 } | 96 } |
101 | 97 |
102 /// A function to pass as a [StreamTransformer]'s `handleDone` callback. | 98 /// A function to pass as a [StreamTransformer]'s `handleDone` callback. |
103 void _closeSink(EventSink sink) { | 99 void _closeSink(EventSink sink) { |
104 sink.close(); | 100 sink.close(); |
105 } | 101 } |
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