Implement TouchFile on drive::FileSystem.

chrome/browser/chromeos/drive/file_system/touch_operation.h

Index: chrome/browser/chromeos/drive/file_system/touch_operation.h
diff --git a/chrome/browser/chromeos/drive/file_system/touch_operation.h b/chrome/browser/chromeos/drive/file_system/touch_operation.h
new file mode 100644
index 0000000000000000000000000000000000000000..48a3590fd46e057b0f87adffe4bd6247af456367
--- /dev/null
+++ b/chrome/browser/chromeos/drive/file_system/touch_operation.h
@@ -0,0 +1,89 @@
+// Copyright 2013 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_FILE_SYSTEM_TOUCH_OPERATION_H_
+#define CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_TOUCH_OPERATION_H_
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/chromeos/drive/file_errors.h"
+#include "chrome/browser/google_apis/gdata_errorcode.h"
+
+namespace base {
+class FilePath;
+class SequencedTaskRunner;
+class Time;
+}  // namespace base
+
+namespace google_apis {
+class ResourceEntry;
+}  // namespace google_apis
+
+namespace drive {
+namespace internal {
+class ResourceMetadata;
+}  // namespace internal
+
+class JobScheduler;
+class ResourceEntry;
+
+namespace file_system {
+
+class OperationObserver;
+
+class TouchOperation {
+ public:
+  TouchOperation(base::SequencedTaskRunner* blocking_task_runner,
+                 OperationObserver* observer,
+                 JobScheduler* scheduler,
+                 internal::ResourceMetadata* metadata);
+  ~TouchOperation();
+
+  // Touches the file by updating last access time and last modified time.
+  // Upon completion, invokes |callback|.
+  // |last_access_time|, |last_modified_time| and |callback| must not be null.
+  void TouchFile(const base::FilePath& file_path,
+                 const base::Time& last_access_time,
+                 const base::Time& last_modified_time,
+                 const FileOperationCallback& callback);
+
+ private:
+  // Part of TouchFile(). Runs after GetResourceEntry is completed.
+  void TouchFileAfterGetResourceEntry(const base::FilePath& file_path,
+                                      const base::Time& last_access_time,
+                                      const base::Time& last_modified_time,
+                                      const FileOperationCallback& callback,
+                                      ResourceEntry* entry,
+                                      FileError error);
+
+  // Part of TouchFile(). Runs after the server side update for last access time
+  // and last modified time is completed.
+  void TouchFileAfterServerTimeStampUpdated(
+      const base::FilePath& file_path,
+      const FileOperationCallback& callback,
+      google_apis::GDataErrorCode gdata_error,
+      scoped_ptr<google_apis::ResourceEntry> resource_entry);
+
+  // Part of TouchFile(). Runs after refreshing the local metadata is completed.
+  void TouchFileAfterRefreshMetadata(const base::FilePath& file_path,
+                                     const FileOperationCallback& callback,
+                                     FileError error);
+
+  scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
+  OperationObserver* observer_;
+  JobScheduler* scheduler_;
+  internal::ResourceMetadata* metadata_;
+
+  // Note: This should remain the last member so it'll be destroyed and
+  // invalidate the weak pointers before any other members are destroyed.
+  base::WeakPtrFactory<TouchOperation> weak_ptr_factory_;
+  DISALLOW_COPY_AND_ASSIGN(TouchOperation);
+};
+
+}  // namespace file_system
+}  // namespace drive
+
+#endif  // CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_TOUCH_OPERATION_H_