Error reporting on File in dart:io

runtime/bin/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.
 
 
-// Used for holding error code and error message for failed OS system calls.
-class _OSStatus {
-  int _errorCode;
-  String _errorMessage;
-}
-
-
 class _Directory implements Directory {
   static final kCreateRequest = 0;
   static final kDeleteRequest = 1;
   static final kExistsRequest = 2;
   static final kCreateTempRequest = 3;
   static final kListRequest = 4;
 
   _Directory(String this._path);
   _Directory.current() : _path = _current();
 
   static String _current() native "Directory_Current";
-  static String _createTemp(String template,
-                            _OSStatus status) native "Directory_CreateTemp";
+  static _createTemp(String template) native "Directory_CreateTemp";
   static int _exists(String path) native "Directory_Exists";
   static bool _create(String path) native "Directory_Create";
   static bool _delete(String path, bool recursive) native "Directory_Delete";
   static SendPort _newServicePort() native "Directory_NewServicePort";
 
   void exists(void callback(bool exists)) {
     _ensureDirectoryService();
     List request = new List(2);
     request[0] = kExistsRequest;
     request[1] = _path;
     _directoryService.call(request).then((result) {
       if (result < 0) {
         if (_onError != null) {
           _onError("Diretory exists test failed: $_path");
         }
       } else {
         callback(result == 1);
       }
     });
   }
 
   bool existsSync() {
     int exists = _exists(_path);
     if (exists < 0) {
-      throw new DirectoryException("Diretory exists test failed: $_path");
+      throw new DirectoryIOException("Diretory exists test failed: $_path");
     }
     return (exists == 1);
   }
 
   void create(void callback()) {
     _ensureDirectoryService();
     List request = new List(2);
     request[0] = kCreateRequest;
     request[1] = _path;
     _directoryService.call(request).then((result) {
       if (result) {
         callback();
       } else if (_onError != null) {
         _onError("Directory creation failed: $_path");
       }
     });
   }
 
   void createSync() {
     if (!_create(_path)) {
-      throw new DirectoryException("Directory creation failed: $_path");
+      throw new DirectoryIOException("Directory creation failed: $_path");
     }
   }
 
   void createTemp(void callback()) {
     _ensureDirectoryService();
     List request = new List(2);
     request[0] = kCreateTempRequest;
     request[1] = _path;
     _directoryService.call(request).then((result) {
       if (result is !List) {
         _path = result;
         callback();
       } else if (_onError != null) {
         _onError("Could not create temporary directory [$_path]: " +
                  "${result[1]}");
       }
     });
   }
 
   void createTempSync() {
-    var status = new _OSStatus();
-    var result = _createTemp(path, status);
-    if (result != null) {
-      _path = result;
-    } else {
-      throw new DirectoryException(
-          "Could not create temporary directory [$_path]: " +
-          "${status._errorMessage}",
-          status._errorCode);
+    if (_path is !String) {
+      throw new IllegalArgumentException();
     }
+    var result = _createTemp(path);
+    if (result is OSError) {
+      throw new DirectoryIOException("Could not create temporary directory",
+                                     result);
+    }
+    _path = result;
   }
 
   void _deleteHelper(bool recursive, String errorMsg, void callback()) {
     _ensureDirectoryService();
     List request = new List(3);
     request[0] = kDeleteRequest;
     request[1] = _path;
     request[2] = recursive;
     _directoryService.call(request).then((result) {
       if (result) {
         callback();
       } else if (_onError != null) {
         _onError("${errorMsg}: $_path");
       }
     });
   }
 
   void delete(void callback()) {
     _deleteHelper(false, "Directory deletion failed", callback);
   }
 
   void deleteRecursively(void callback()) {
     _deleteHelper(true, "Recursive directory deletion failed", callback);
   }
 
   void deleteSync() {
     bool recursive = false;
     if (!_delete(_path, recursive)) {
-      throw new DirectoryException("Directory deletion failed: $_path");
+      throw new DirectoryIOException("Directory deletion failed: $_path");
     }
   }
 
   void deleteRecursivelySync() {
     bool recursive = true;
     if (!_delete(_path, recursive)) {
-      throw new DirectoryException(
+      throw new DirectoryIOException(
           "Recursive directory deletion failed: $_path");
     }
   }
 
   void list([bool recursive = false]) {
     final int kListDirectory = 0;
     final int kListFile = 1;
     final int kListError = 2;
     final int kListDone = 3;
 
@@ skipping 54 matching lines @@
   }
 
   var _onDir;
   var _onFile;
   var _onDone;
   var _onError;
 
   String _path;
   SendPort _directoryService;
 }