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| 1 // Copyright (c) 2015, 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 library crypto.digest_sink; |
| 6 |
| 7 import 'digest.dart'; |
| 8 |
| 9 /// A sink used to get a digest value out of [Hash.startChunkedConversion]. |
| 10 class DigestSink extends Sink<Digest> { |
| 11 /// The value added to the sink, if any. |
| 12 Digest get value { |
| 13 assert(_value != null); |
| 14 return _value; |
| 15 } |
| 16 Digest _value; |
| 17 |
| 18 /// Adds [value] to the sink. |
| 19 /// |
| 20 /// Unlike most sinks, this may only be called once. |
| 21 void add(Digest value) { |
| 22 assert(_value == null); |
| 23 _value = value; |
| 24 } |
| 25 |
| 26 void close() { |
| 27 assert(_value != null); |
| 28 } |
| 29 } |
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