gdata: Fix "save as pdf" to work on Google Drive.

chrome/browser/chromeos/gdata/gdata_file_writing.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_GDATA_GDATA_FILE_WRITING_H_
+#define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILE_WRITING_H_
+
+#include "base/bind.h"
+#include "base/file_path.h"
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/chromeos/gdata/gdata_errorcode.h"
+#include "chrome/browser/chromeos/gdata/gdata_file_system_interface.h"
+
+namespace gdata {
+
+// This class provides higher level operations for writing to GData files over
+// GDataFileSystemInterface.
+class GDataFileWriting {

[satorux1, 2012/08/02 01:08:09]

The class name looks rather unusual. Maybe something like FileWriteHelper?

[kinaba, 2012/08/02 04:57:31]

Done.

+ public:
+  explicit GDataFileWriting(GDataFileSystemInterface* file_system);
+  ~GDataFileWriting();
+
+  // Prepares a local temporary file path and passes it to |callback| on the
+  // blocking thread pool that allows file operations. The modification to
+  // the file is reflected to GData |path|. If |path| does not exist, a new
+  // file is created.
+  //
+  // Can be called from UI/IO thread.
+  void PrepareWritableFileAndRun(const FilePath& path,
+                                 const OpenFileCallback& callback);
+
+ private:
+  // Part of PrepareWritableFilePathAndRun(). It forwards the task to the UI
+  // thread, tries CreateFile for the case file does not exist yet, does
+  // OpenFile to download and mark the file as dirty, runs |callback|, and
+  // finally calls CloseFile.
+  void PrepareWritableFileAndRunOnUIThread(
+      const FilePath& file_path,
+      const OpenFileCallback& callback);
+  void PrepareWritableFileAndRunAfterCreateFile(
+      const FilePath& file_path,
+      const OpenFileCallback& callback,
+      GDataFileError result);
+  void PrepareWritableFileAndRunAfterOpenFile(
+      const FilePath& file_path,
+      const OpenFileCallback& callback,
+      GDataFileError result,
+      const FilePath& local_cache_path);
+  void PrepareWritableFileAndRunAfterCallback(const FilePath& file_path);
+
+  // File system owned by GDataSystemService.
+  GDataFileSystemInterface* file_system_;
+
+  // WeakPtrFactory and WeakPtr bound to the UI thread.
+  base::WeakPtrFactory<GDataFileWriting> ui_weak_ptr_factory_;

[satorux1, 2012/08/02 01:08:09]

weak_ptr_factory_

[kinaba, 2012/08/02 04:57:31]

Done.

+  base::WeakPtr<GDataFileWriting> ui_weak_ptr_;

[satorux1, 2012/08/02 01:08:09]

Please remove this. Please use GetWeakPtr()

[kinaba, 2012/08/02 04:57:31]

Done.

+};
+
+}  // namespace gdata
+
+#endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILE_WRITING_H_