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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:collection'; |
| 6 |
| 7 /// A sink that provides access to all the [events] that have been passed to it. |
| 8 /// |
| 9 /// See also [ChunkedConversionSink.withCallback]. |
| 10 class AccumulatorSink<T> implements Sink<T> { |
| 11 /// An unmodifiable list of events passed to this sink so far. |
| 12 List<T> get events => new UnmodifiableListView(_events); |
| 13 final _events = <T>[]; |
| 14 |
| 15 /// Whether [close] has been called. |
| 16 bool get isClosed => _isClosed; |
| 17 var _isClosed = false; |
| 18 |
| 19 /// Removes all events from [events]. |
| 20 /// |
| 21 /// This can be used to avoid double-processing events. |
| 22 void clear() { |
| 23 _events.clear(); |
| 24 } |
| 25 |
| 26 void add(T event) { |
| 27 if (_isClosed) { |
| 28 throw new StateError("Can't add to a closed sink."); |
| 29 } |
| 30 |
| 31 _events.add(event); |
| 32 } |
| 33 |
| 34 void close() { |
| 35 _isClosed = true; |
| 36 } |
| 37 } |
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