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1 // Copyright (c) 2012, 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 part of dart.async; | |
6 | |
7 typedef void _CollectionSinkCallback<T>(Collection<T> collection); | |
8 typedef void _CollectionSinkErrorCallback(AsyncError error); | |
9 | |
10 /** | |
11 * EventSink that stores incoming data in a collection. | |
12 * | |
13 * *Deprecated*. | |
14 */ | |
15 class CollectionSink<T> extends StreamSink<T> { | |
16 // TODO(8997): Implement EventSink instead. | |
17 final Collection<T> collection; | |
18 final _CollectionSinkCallback<T> _callback; | |
19 final _CollectionSinkErrorCallback _errorCallback; | |
20 bool _isClosed = false; | |
21 | |
22 /** | |
23 * Create a sink that stores incoming values in a collection. | |
24 * | |
25 * The [collection] is the collection to add the values to. | |
26 * | |
27 * If [callback] is provided, then it's called with the collection as arugment | |
28 * when the sink's [close] method is called. | |
29 */ | |
30 CollectionSink(this.collection, | |
31 { void onClose(Collection<T> collection), | |
32 void onError(AsyncError error) }) | |
33 : this._callback = onClose, | |
34 this._errorCallback = onError; | |
35 | |
36 add(T value) { | |
37 if (_isClosed) throw new StateError("Adding to closed sink"); | |
38 collection.add(value); | |
39 } | |
40 | |
41 void addError(AsyncError error) { | |
42 if (_isClosed) throw new StateError("Adding error to closed sink"); | |
43 if (_errorCallback != null) _errorCallback(error); | |
44 } | |
45 | |
46 void close() { | |
47 if (_isClosed) throw new StateError("Closing closed sink"); | |
48 _isClosed = true; | |
49 if (_callback != null) _callback(collection); | |
50 } | |
51 } | |
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