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1 // Copyright (c) 2014, 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 pub.asset.serialize.get_input_transform; | |
6 | |
7 import 'dart:async'; | |
8 import 'dart:convert'; | |
9 | |
10 import 'package:barback/barback.dart'; | |
11 | |
12 import '../utils.dart'; | |
13 | |
14 /// A mixin for transforms that support [getInput] and the associated suite of | |
15 /// methods. | |
16 abstract class GetInputTransform { | |
17 Future<Asset> getInput(AssetId id); | |
18 | |
19 Future<String> readInputAsString(AssetId id, {Encoding encoding}) { | |
20 if (encoding == null) encoding = UTF8; | |
21 return getInput(id).then((input) => | |
22 input.readAsString(encoding: encoding)); | |
23 } | |
24 | |
25 Stream<List<int>> readInput(AssetId id) => | |
26 futureStream(getInput(id).then((input) => input.read())); | |
27 | |
28 Future<bool> hasInput(AssetId id) { | |
29 return getInput(id).then((_) => true).catchError((error) { | |
30 if (error is AssetNotFoundException && error.id == id) return false; | |
31 throw error; | |
32 }); | |
33 } | |
34 } | |
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