dart:io | Add asynchronous versions of the methods of FileSystemEntity and Link.

tests/standalone/io/file_system_async_links_test.dart

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import "dart:async";
+import "package:expect/expect.dart";
+import "dart:io";
+import "dart:isolate";
+
+
+class FutureExpect {
+  static Future isTrue(Future<bool> result) =>
+      result.then((value) => Expect.isTrue(value));
+  static Future isFalse(Future<bool> result) =>
+      result.then((value) => Expect.isFalse(value));
+  static Future equals(expected, Future result) =>
+      result.then((value) => Expect.equals(expected, value));
+  static Future listEquals(expected, Future result) =>
+      result.then((value) => Expect.listEquals(expected, value));
+  static Future throws(Future result) =>
+      result.then((value) {
+        throw new ExpectException(
+            "FutureExpect.throws received $value instead of an exception");
+        }, onError: (_) => null);
+}
+
+
+Future testFileExistsCreate() {
+  return new Directory('').createTemp().then((temp) {
+    var x = '${temp.path}${Platform.pathSeparator}x';
+    var y = '${temp.path}${Platform.pathSeparator}y';
+    return new Link(y).create(x)
+    .then((link) => Expect.equals(y, link.path))
+    .then((_) => FutureExpect.isFalse(new File(y).exists()))
+    .then((_) => FutureExpect.isFalse(new File(x).exists()))
+    .then((_) => FutureExpect.isTrue(FileSystemEntity.isLink(y)))
+    .then((_) => FutureExpect.isFalse(FileSystemEntity.isLink(x)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.NOT_FOUND,
+                                     FileSystemEntity.type(y)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.NOT_FOUND,
+                                     FileSystemEntity.type(x)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.LINK,
+                                     FileSystemEntity.type(y,
+                                                           followLinks: false)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.NOT_FOUND,
+                                     FileSystemEntity.type(x,
+                                                           followLinks: false)))
+    .then((_) => FutureExpect.equals(x, new Link(y).target()))
+    .then((_) => new File(y).create())
+    .then((yFile) => Expect.equals(y, yFile.path))
+    .then((_) => FutureExpect.isTrue(new File(y).exists()))
+    .then((_) => FutureExpect.isTrue(new File(x).exists()))
+    .then((_) => FutureExpect.isTrue(FileSystemEntity.isLink(y)))
+    .then((_) => FutureExpect.isFalse(FileSystemEntity.isLink(x)))
+    .then((_) => FutureExpect.isTrue(FileSystemEntity.isFile(y)))
+    .then((_) => FutureExpect.isTrue(FileSystemEntity.isFile(x)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.FILE,
+                                     FileSystemEntity.type(y)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.FILE,
+                                     FileSystemEntity.type(x)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.LINK,
+                                     FileSystemEntity.type(y,
+                                                           followLinks: false)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.FILE,
+                                     FileSystemEntity.type(x,
+                                                           followLinks: false)))
+    .then((_) => FutureExpect.equals(x, new Link(y).target()))
+    .then((_) => new File(x).delete())
+    .then((xDeletedFile) => Expect.equals(x, xDeletedFile.path))
+    .then((_) => new Directory(x).create())
+    .then((xCreatedDirectory) => Expect.equals(x, xCreatedDirectory.path))
+    .then((_) => FutureExpect.isTrue(FileSystemEntity.isLink(y)))
+    .then((_) => FutureExpect.isFalse(FileSystemEntity.isLink(x)))
+    .then((_) => FutureExpect.isTrue(FileSystemEntity.isDirectory(y)))
+    .then((_) => FutureExpect.isTrue(FileSystemEntity.isDirectory(x)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.DIRECTORY,
+                                     FileSystemEntity.type(y)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.DIRECTORY,
+                                     FileSystemEntity.type(x)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.LINK,
+                                     FileSystemEntity.type(y,
+                                                           followLinks: false)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.DIRECTORY,
+                                     FileSystemEntity.type(x,
+                                                           followLinks: false)))
+    .then((_) => FutureExpect.equals(x, new Link(y).target()))
+    .then((_) => new Link(y).delete())
+    .then((_) => FutureExpect.isFalse(FileSystemEntity.isLink(y)))
+    .then((_) => FutureExpect.isFalse(FileSystemEntity.isLink(x)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.NOT_FOUND,
+                                     FileSystemEntity.type(y)))
+    .then((_) => FutureExpect.equals(FileSystemEntityType.DIRECTORY,
+                                     FileSystemEntity.type(x)))
+    .then((_) => FutureExpect.throws(new Link(y).target()))
+    .then((_) => temp.delete(recursive: true));
+  });
+}
+
+
+Future testFileDelete() {
+  return new Directory('').createTemp().then((temp) {
+    var x = '${temp.path}${Platform.pathSeparator}x';
+    var y = '${temp.path}${Platform.pathSeparator}y';
+    return new File(x).create()
+    .then((_) => new Link(y).create(x))
+    .then((_) => FutureExpect.isTrue(new File(x).exists()))
+    .then((_) => FutureExpect.isTrue(new File(y).exists()))
+    .then((_) => new File(y).delete())
+    .then((_) => FutureExpect.isTrue(new File(x).exists()))
+    .then((_) => FutureExpect.isFalse(new File(y).exists()))
+    .then((_) => new Link(y).create(x))
+    .then((_) => FutureExpect.isTrue(new File(x).exists()))
+    .then((_) => FutureExpect.isTrue(new File(y).exists()))
+    .then((_) => new File(y).delete())
+    .then((_) => FutureExpect.isTrue(new File(x).exists()))
+    .then((_) => FutureExpect.isFalse(new File(y).exists()))
+    .then((_) => temp.delete(recursive: true));
+  });
+}
+
+
+Future testFileWriteRead() {
+  return new Directory('').createTemp().then((temp) {
+    var x = '${temp.path}${Platform.pathSeparator}x';
+    var y = '${temp.path}${Platform.pathSeparator}y';
+    var data = "asdf".codeUnits;
+    return new File(x).create()
+    .then((_) => new Link(y).create(x))
+    .then((_) =>
+          (new File(y).openWrite(mode: FileMode.WRITE)..add(data)).close())
+    .then((_) => FutureExpect.listEquals(data, new File(y).readAsBytes()))
+    .then((_) => FutureExpect.listEquals(data, new File(x).readAsBytes()))
+    .then((_) => temp.delete(recursive: true));
+  });
+}
+
+
+Future testDirectoryExistsCreate() {
+  return new Directory('').createTemp().then((temp) {
+    var x = '${temp.path}${Platform.pathSeparator}x';
+    var y = '${temp.path}${Platform.pathSeparator}y';
+    return new Link(y).create(x)
+    .then((_) => FutureExpect.isFalse(new Directory(x).exists()))
+    .then((_) => FutureExpect.isFalse(new Directory(y).exists()))
+    .then((_) => FutureExpect.throws(new Directory(y).create()))
+    .then((_) => temp.delete(recursive: true));
+  });
+}
+
+
+Future testDirectoryDelete() {
+  return new Directory('').createTemp().then((temp) =>
+  new Directory('').createTemp().then((temp2) {
+    var y = '${temp.path}${Platform.pathSeparator}y';
+    var x = '${temp2.path}${Platform.pathSeparator}x';
+    var link = new Directory(y);
+    return new File(x).create()
+    .then((_) => new Link(y).create(temp2.path))
+    .then((_) => FutureExpect.isTrue(link.exists()))
+    .then((_) => FutureExpect.isTrue(temp2.exists()))
+    .then((_) => link.delete())
+    .then((_) => FutureExpect.isFalse(link.exists()))
+    .then((_) => FutureExpect.isTrue(temp2.exists()))
+    .then((_) => new Link(y).create(temp2.path))
+    .then((_) => FutureExpect.isTrue(link.exists()))
+    .then((_) => temp.delete(recursive: true))
+    .then((_) => FutureExpect.isFalse(link.exists()))
+    .then((_) => FutureExpect.isFalse(temp.exists()))
+    .then((_) => FutureExpect.isTrue(temp2.exists()))
+    .then((_) => FutureExpect.isTrue(new File(x).exists()))
+    .then((_) => temp2.delete(recursive: true));
+  }));
+}
+
+
+Future testDirectoryListing() {
+  return new Directory('').createTemp().then((temp) =>
+  new Directory('').createTemp().then((temp2) {
+    var sep = Platform.pathSeparator;
+    var y = '${temp.path}${sep}y';
+    var x = '${temp2.path}${sep}x';
+    return new File(x).create()
+    .then((_) => new Link(y).create(temp2.path))
+    .then((_) => temp.list(recursive: true).singleWhere(
+        (entry) => entry is File))
+    .then((file) => Expect.isTrue(file.path.endsWith('$y${sep}x')))
+    .then((_) => temp.list(recursive: true).singleWhere(
+        (entry) => entry is Directory))
+    .then((dir) => Expect.isTrue(dir.path.endsWith('y')))
+    .then((_) => temp.delete(recursive: true))
+    .then((_) => temp2.delete(recursive: true));
+  }));
+}
+
+
+Future testDirectoryListingBrokenLink() {
+  return new Directory('').createTemp().then((temp) {
+    var x = '${temp.path}${Platform.pathSeparator}x';
+    var link = '${temp.path}${Platform.pathSeparator}link';
+    var doesNotExist = 'this_thing_does_not_exist';
+    bool sawFile = false;
+    bool sawLink = false;
+    return new File(x).create()
+    .then((_) => new Link(link).create(doesNotExist))
+    .then((_) => temp.list(recursive: true).forEach(
+      (entity) {
+        if (entity is File) {
+          Expect.isFalse(sawFile);
+          sawFile = true;
+          Expect.isTrue(entity.path.endsWith(x));
+        } else {
+          Expect.isTrue(entity is Link);
+          Expect.isFalse(sawLink);
+          sawLink = true;
+          Expect.isTrue(entity.path.endsWith(link));
+        }
+        return true;
+      }))
+    .then((_) => temp.delete(recursive: true));
+  });
+}
+
+
+main() {
+  // Links on Windows are tested by windows_file_system_[async_]links_test.
+  if (Platform.operatingSystem != 'windows') {
+    ReceivePort keepAlive = new ReceivePort();
+    testFileExistsCreate()
+    .then((_) => testFileDelete())
+    .then((_) => testFileWriteRead())
+    .then((_) => testDirectoryExistsCreate())
+    .then((_) => testDirectoryDelete())
+    .then((_) => testDirectoryListing())
+    .then((_) => testDirectoryListingBrokenLink())
+    .then((_) => keepAlive.close());
+  }
+}