Add FileException.path and clean up file exceptions.

sdk/lib/io/link.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.
 
 part of dart.io;
 
 /**
  * [Link] objects are references to filesystem links.
  *
  */
@@ skipping 136 matching lines @@
     _ensureFileService();
     if (Platform.operatingSystem == 'windows') {
       target = _makeWindowsLinkTarget(target);
     }
     List request = new List(3);
     request[0] = _CREATE_LINK_REQUEST;
     request[1] = path;
     request[2] = target;
     return _fileService.call(request).then((response) {
       if (_isErrorResponse(response)) {
-        throw _exceptionFromResponse(response,
-            "Cannot create link '$path' to target '$target'");
+        throw _exceptionFromResponse(
+            response, "Cannot create link to target '$target'", path);
       }
       return this;
     });
   }
 
   void createSync(String target) {
     if (Platform.operatingSystem == 'windows') {
       target = _makeWindowsLinkTarget(target);
     }
     var result = _File._createLink(path, target);
@@ skipping 28 matching lines @@
     createSync(target);
   }
 
   Future<Link> delete() {
     _ensureFileService();
     List request = new List(2);
     request[0] = _DELETE_LINK_REQUEST;
     request[1] = path;
     return _fileService.call(request).then((response) {
       if (_isErrorResponse(response)) {
-        throw _exceptionFromResponse(response, "Cannot delete link '$path'");
+        throw _exceptionFromResponse(response, "Cannot delete link", path);
       }
       return this;
     });
   }
 
   void deleteSync() {
     var result = _File._deleteLink(path);
     throwIfError(result, "Cannot delete link", path);
   }
 
   Future<Link> rename(String newPath) {
     _ensureFileService();
     List request = new List(3);
     request[0] = _RENAME_LINK_REQUEST;
     request[1] = path;
     request[2] = newPath;
     return _fileService.call(request).then((response) {
       if (_isErrorResponse(response)) {
         throw _exceptionFromResponse(
-            response, "Cannot rename link '$path' to '$newPath'");
+            response, "Cannot rename link to '$newPath'", path);
       }
       return new Link(newPath);
     });
   }
 
   Link renameSync(String newPath) {
     var result = _File._renameLink(path, newPath);
     throwIfError(result, "Cannot rename link '$path' to '$newPath'");
     return new Link(newPath);
   }
 
   Future<String> target() {
     _ensureFileService();
     List request = new List(2);
     request[0] = _LINK_TARGET_REQUEST;
     request[1] = path;
     return _fileService.call(request).then((response) {
       if (_isErrorResponse(response)) {
-        throw _exceptionFromResponse(response,
-            "Cannot get target of link '$path'");
+        throw _exceptionFromResponse(
+            response, "Cannot get target of link", path);
       }
       return response;
     });
   }
 
   String targetSync() {
     var result = _File._linkTarget(path);
     throwIfError(result, "Cannot read link", path);
     return result;
   }
 
   static throwIfError(Object result, String msg, [String path = ""]) {
     if (result is OSError) {
       throw new LinkException(msg, path, result);
     }
   }
 
   bool _isErrorResponse(response) {
     return response is List && response[0] != _SUCCESS_RESPONSE;
   }
 
   void _ensureFileService() {
     if (_fileService == null) {
       _fileService = _FileUtils._newServicePort();
     }
   }
 
-  _exceptionFromResponse(response, String message) {
+  _exceptionFromResponse(response, String message, String path) {
     assert(_isErrorResponse(response));
     switch (response[_ERROR_RESPONSE_ERROR_TYPE]) {
       case _ILLEGAL_ARGUMENT_RESPONSE:
         return new ArgumentError();
       case _OSERROR_RESPONSE:
         var err = new OSError(response[_OSERROR_RESPONSE_MESSAGE],
                               response[_OSERROR_RESPONSE_ERROR_CODE]);
-        return new LinkException(message, err);
+        return new LinkException(message, path, err);
       default:
         return new Exception("Unknown error");
     }
   }
 }
 
 
 class LinkException implements IOException {
   const LinkException([String this.message = "",
                        String this.path = "",
@@ skipping 14 matching lines @@
       if (path != null) {
         sb.write(", path = $path");
       }
     }
     return sb.toString();
   }
   final String message;
   final String path;
   final OSError osError;
 }