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// 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_FILE_WRITE_HELPER_H_
#define CHROME_BROWSER_CHROMEOS_DRIVE_FILE_WRITE_HELPER_H_
#include "base/memory/weak_ptr.h"
#include "chrome/browser/chromeos/drive/drive_file_error.h"
#include "chrome/browser/chromeos/drive/drive_file_system_interface.h"
class FilePath;
namespace drive {
// This class provides higher level operations for writing to Drive files over
// DriveFileSystemInterface.
class FileWriteHelper {
public:
explicit FileWriteHelper(DriveFileSystemInterface* file_system);
~FileWriteHelper();
// 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.
//
// Must be called from UI thread.
void PrepareWritableFileAndRun(const FilePath& path,
const OpenFileCallback& callback);
private:
// Part of PrepareWritableFilePathAndRun(). It 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 PrepareWritableFileAndRunAfterCreateFile(
const FilePath& file_path,
const OpenFileCallback& callback,
DriveFileError result);
void PrepareWritableFileAndRunAfterOpenFile(
const FilePath& file_path,
const OpenFileCallback& callback,
DriveFileError result,
const FilePath& local_cache_path);
void PrepareWritableFileAndRunAfterCallback(const FilePath& file_path);
// File system owned by DriveSystemService.
DriveFileSystemInterface* file_system_;
// WeakPtrFactory bound to the UI thread.
// Note: This should remain the last member so it'll be destroyed and
// invalidate its weak pointers before any other members are destroyed.
base::WeakPtrFactory<FileWriteHelper> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(FileWriteHelper);
};
} // namespace drive
#endif // CHROME_BROWSER_CHROMEOS_DRIVE_FILE_WRITE_HELPER_H_
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