Add uri getter on file system entity.

sdk/lib/io/directory.dart

 // Copyright (c) 2012, 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.
 
 part of dart.io;
 
 /**
  * A reference to a directory (or _folder_) on the file system.
  *
  * A Directory instance is an object holding a [path] on which operations can
@@ skipping 26 matching lines @@
  *     import 'dart:io';
  *
  *     void main() {
  *       // Creates dir/ and dir/subdir/.
  *       new Directory('dir/subdir').create(recursive: true)
  *         // The created directory is returned as a Future.
  *         .then((Directory directory) {
  *           print(directory.path);
  *       });
  *     }
- * 
+ *
  * ## List a directory
  *
  * Use the [list] or [listSync] methods to get the files and directories
  * contained by a directory.
  * Set `recursive` to true to recursively list all subdirectories.
  * Set `followLinks` to true to follow symbolic links.
  * The list method returns a [Stream] that provides FileSystemEntity
  * objects. Use the listen callback function to process each object
  * as it become available.
  *
@@ skipping 35 matching lines @@
  *       });
  *     }
  *
  *
  * In addition to exists, the [stat], [rename], and
  * other methods, return Futures.
  *
  * ## Other resources
  *
  * * [Dart by Example](https://www.dartlang.org/dart-by-example/#files-directories-and-symlinks)
- * provides additional task-oriented code samples that show how to use 
+ * provides additional task-oriented code samples that show how to use
  * various API from the Directory class and the related [File] class.
  *
  * * [I/O for Command-Line Apps](https://www.dartlang.org/docs/dart-up-and-running/contents/ch03.html#ch03-dartio---file-and-socket-io-for-command-line-apps)
  * a section from _A Tour of the Dart Libraries_
  * covers files and directories.
  *
  * * [Write Command-Line Apps](https://www.dartlang.org/docs/tutorials/cmdline/),
  * a tutorial about writing command-line apps, includes information
  * about files and directories.
  */
-abstract class Directory extends FileSystemEntity {
+abstract class Directory implements FileSystemEntity {
   /**
    * Gets the path of this directory.
    */
   final String path;
 
   /**
    * Creates a [Directory] object.
    *
    * If [path] is a relative path, it will be interpreted relative to the
    * current working directory (see [Directory.current]), when used.
@@ skipping 10 matching lines @@
    */
   factory Directory.fromUri(Uri uri) => new Directory(uri.toFilePath());
 
   /**
    * Creates a directory object pointing to the current working
    * directory.
    */
   static Directory get current => _Directory.current;
 
   /**
+   * Returns a [Uri] representing the directory's location.
+   *
+   * The returned URI's scheme is always "file" if the entity's [path] is
+   * absolute, otherwise the scheme will be empty.
+   * The returned URI's path always ends in a slash ('/').
+   */
+  Uri get uri;
+
+  /**
    * Sets the current working directory of the Dart process including
    * all running isolates. The new value set can be either a [Directory]
    * or a [String].
    *
    * The new value is passed to the OS's system call unchanged, so a
    * relative path passed as the new working directory will be
    * resolved by the OS.
    *
    * Note that setting the current working directory is a synchronous
    * operation and that it changes the the working directory of *all*
@@ skipping 140 matching lines @@
    * directories, files, and links.
    */
   List<FileSystemEntity> listSync({bool recursive: false,
                                    bool followLinks: true});
 
   /**
    * Returns a human readable string for this Directory instance.
    */
   String toString();
 }