dart:io | Add Directory.CreateSystemTemp(template) and change Directory.CreateTemp(template).

sdk/lib/io/directory_impl.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;
 
 class _Directory extends FileSystemEntity implements Directory {
   final String path;
 
   _Directory(String this.path) {
     if (path is! String) {
       throw new ArgumentError('${Error.safeToString(path)} '
                               'is not a String');
     }
   }
 
   external static _current();
   external static _setCurrent(path);
-  external static _createTemp(String template);
+  external static _createTemp(String template, bool system);
   external static int _exists(String path);
   external static _create(String path);
   external static _deleteNative(String path, bool recursive);
   external static _rename(String path, String newPath);
   external static List _list(String path, bool recursive, bool followLinks);
 
   static Directory get current {
     var result = _current();
     if (result is OSError) {
       throw new DirectoryException(
@@ skipping 112 matching lines @@
   }
 
   void createSync({bool recursive: false}) {
     if (recursive) return createRecursivelySync();
     var result = _create(path);
     if (result is OSError) {
       throw new DirectoryException("Creation failed", path, result);
     }
   }
 
-  Future<Directory> createTemp() {
-    return _IOService.dispatch(_DIRECTORY_CREATE_TEMP, [path]).then((response) {
+  // TODO(13720): Make template argument mandatory on Oct 18, 2013.
+  Future<Directory> createTemp([String template]) {
+    if (path == '') {
+      if (template == null) template = '';
+      return createSystemTemp(template);
+      // TODO(13720): On Oct 18, 2013, replace this with
+      // an error.  createTemp cannot be called on a Directory with empty path.
+    }
+    String fullTemplate = "$path${Platform.pathSeparator}";
+    if (template != null) fullTemplate = "$fullTemplate$template";
+    return _IOService.dispatch(_DIRECTORY_CREATE_TEMP, [fullTemplate])
+        .then((response) {
       if (_isErrorResponse(response)) {
         throw _exceptionOrErrorFromResponse(
             response, "Creation of temporary directory failed");
       }
       return new Directory(response);
     });
   }
 
-  Directory createTempSync() {
-    var result = _createTemp(path);
+  // TODO(13720): Make template argument mandatory on Oct 18, 2013.
+  Directory createTempSync([String template]) {
+    if (path == '') {
+      if (template == null) template = '';
+      return createSystemTempSync(template);
+      // TODO(13720): On Oct 18, 2013, replace this with
+      // an error.  createTemp cannot be called on a Directory with empty path.
+    }
+    String fullTemplate = "$path${Platform.pathSeparator}";
+    if (template != null) fullTemplate = "$fullTemplate$template";
+    var result = _createTemp(fullTemplate, false);
     if (result is OSError) {
       throw new DirectoryException("Creation of temporary directory failed",
-                                   path,
+                                   fullTemplate,
                                    result);
     }
     return new Directory(result);
+  }
+
+  static Future<Directory> createSystemTemp(String template) {
+    return _IOService.dispatch(_DIRECTORY_CREATE_SYSTEM_TEMP,
+                               [template]).then((response) {
+      if (response is List && response[0] != _SUCCESS_RESPONSE) {
+        throw new Directory(template)._exceptionOrErrorFromResponse(
+            response, "Creation of temporary directory failed");
+      }
+      return new Directory(response);
+    });
+  }
+
+  static Directory createSystemTempSync(String template) {
+    var result = _createTemp(template, true);
+    if (result is OSError) {
+      throw new DirectoryException("Creation of temporary directory failed",
+                                   template,
+                                   result);
+    }
+    return new Directory(result);
   }
 
   Future<Directory> _delete({bool recursive: false}) {
     return _IOService.dispatch(_DIRECTORY_DELETE, [path, recursive])
         .then((response) {
           if (_isErrorResponse(response)) {
             throw _exceptionOrErrorFromResponse(response, "Deletion failed");
           }
           return this;
         });
@@ skipping 188 matching lines @@
       controller.addError(
           new DirectoryException("Directory listing failed",
                                  errorPath,
                                  err));
     } else {
       controller.addError(
           new DirectoryException("Internal error"));
     }
   }
 }