drive: Change the return type of ResourceMetadata's methods to FileError

chrome/browser/chromeos/drive/resource_metadata.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_DRIVE_RESOURCE_METADATA_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_RESOURCE_METADATA_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 30 matching lines @@
 
   // Destroys this object.  This method posts a task to |blocking_task_runner_|
   // to safely delete this object.
   // Must be called on the UI thread.
   void Destroy();
 
   // Resets this object.
   FileError Reset();
 
   // Returns the largest changestamp.
-  int64 GetLargestChangestamp();
+  FileError GetLargestChangestamp(int64* out_value);
 
   // Sets the largest changestamp.
   FileError SetLargestChangestamp(int64 value);
 
   // Adds |entry| to the metadata tree based on its parent_local_id.
   FileError AddEntry(const ResourceEntry& entry, std::string* out_id);
 
   // Removes entry with |id| from its parent.
   FileError RemoveEntry(const std::string& id);
 
@@ skipping 10 matching lines @@
                                 ResourceEntryVector* out_entries);
 
   // Finds and reads a directory by |id|.
   FileError ReadDirectoryById(const std::string& id,
                               ResourceEntryVector* out_entries);
 
   // Replaces an existing entry with the same local ID as |entry|.
   FileError RefreshEntry(const ResourceEntry& entry);
 
   // Recursively gets directories under the entry pointed to by |id|.
-  void GetSubDirectoriesRecursively(const std::string& id,
-                                    std::set<base::FilePath>* sub_directories);
+  FileError GetSubDirectoriesRecursively(
+      const std::string& id,
+      std::set<base::FilePath>* sub_directories);
 
   // Returns the id of the resource named |base_name| directly under
   // the directory with |parent_local_id|.
   // If not found, empty string will be returned.
-  std::string GetChildId(const std::string& parent_local_id,
-                         const std::string& base_name);
+  FileError GetChildId(const std::string& parent_local_id,
+                       const std::string& base_name,
+                       std::string* out_child_id);
 
   // Returns an object to iterate over entries.
   scoped_ptr<Iterator> GetIterator();
 
   // Returns virtual file path of the entry.
-  base::FilePath GetFilePath(const std::string& id);
+  FileError GetFilePath(const std::string& id, base::FilePath* out_file_path);
 
   // Returns ID of the entry at the given path.
   FileError GetIdByPath(const base::FilePath& file_path, std::string* out_id);
 
   // Returns the local ID associated with the given resource ID.
   FileError GetIdByResourceId(const std::string& resource_id,
                               std::string* out_local_id);
 
  private:
   // Note: Use Destroy() to delete this object.
@@ skipping 22 matching lines @@
 
   ResourceMetadataStorage* storage_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceMetadata);
 };
 
 }  // namespace internal
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_RESOURCE_METADATA_H_