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Issue 14070010: Refactor Future constructors. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Added co19 issue number. Created 7 years, 8 months ago
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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2013, 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 library descriptor.nothing; 5 library descriptor.nothing;
6 6
7 import 'dart:async'; 7 import 'dart:async';
8 import 'dart:io'; 8 import 'dart:io';
9 9
10 import 'package:pathos/path.dart' as path; 10 import 'package:pathos/path.dart' as path;
11 11
12 import '../../descriptor.dart'; 12 import '../../descriptor.dart';
13 import '../../scheduled_test.dart'; 13 import '../../scheduled_test.dart';
14 import '../utils.dart'; 14 import '../utils.dart';
15 15
16 /// A descriptor that validates that no file exists with the given name. 16 /// A descriptor that validates that no file exists with the given name.
17 /// Creating this descriptor is a no-op and loading from it is invalid. 17 /// Creating this descriptor is a no-op and loading from it is invalid.
18 class NothingDescriptor extends Descriptor { 18 class NothingDescriptor extends Descriptor {
19 NothingDescriptor(String name) 19 NothingDescriptor(String name)
20 : super(name); 20 : super(name);
21 21
22 Future create([String parent]) => new Future.immediate(null); 22 Future create([String parent]) => new Future.value();
23 23
24 Future validate([String parent]) => schedule(() => validateNow(parent), 24 Future validate([String parent]) => schedule(() => validateNow(parent),
25 "validating '$name' doesn't exist"); 25 "validating '$name' doesn't exist");
26 26
27 Future validateNow([String parent]) => new Future.of(() { 27 Future validateNow([String parent]) => new Future.sync(() {
28 if (parent == null) parent = defaultRoot; 28 if (parent == null) parent = defaultRoot;
29 var fullPath = path.join(parent, name); 29 var fullPath = path.join(parent, name);
30 if (new File(fullPath).existsSync()) { 30 if (new File(fullPath).existsSync()) {
31 throw "Expected nothing to exist at '$fullPath', but found a file."; 31 throw "Expected nothing to exist at '$fullPath', but found a file.";
32 } else if (new Directory(fullPath).existsSync()) { 32 } else if (new Directory(fullPath).existsSync()) {
33 throw "Expected nothing to exist at '$fullPath', but found a " 33 throw "Expected nothing to exist at '$fullPath', but found a "
34 "directory."; 34 "directory.";
35 } else { 35 } else {
36 return; 36 return;
37 } 37 }
38 }); 38 });
39 39
40 Stream<List<int>> load(String pathToLoad) => errorStream("Nothing " 40 Stream<List<int>> load(String pathToLoad) => errorStream("Nothing "
41 "descriptors don't support load()."); 41 "descriptors don't support load().");
42 42
43 Stream<List<int>> read() => errorStream("Nothing descriptors don't support " 43 Stream<List<int>> read() => errorStream("Nothing descriptors don't support "
44 "read()."); 44 "read().");
45 45
46 String describe() => "nothing at '$name'"; 46 String describe() => "nothing at '$name'";
47 } 47 }
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