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// 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_TRUNCATE_OPERATION_H_
#define CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_TRUNCATE_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"
namespace base {
class FilePath;
class SequencedTaskRunner;
} // namespace base
namespace drive {
class JobScheduler;
class ResourceEntry;
namespace internal {
class FileCache;
class ResourceMetadata;
} // namespace internal
namespace file_system {
class OperationObserver;
class DownloadOperation;
// This class encapsulates the drive Truncate function. It is responsible for
// fetching the content from the Drive server if necessary, truncating the
// file content actually, and then notifying the file is locally modified and
// that it is necessary to upload the file to the server.
class TruncateOperation {
public:
TruncateOperation(base::SequencedTaskRunner* blocking_task_runner,
OperationObserver* observer,
JobScheduler* scheduler,
internal::ResourceMetadata* metadata,
internal::FileCache* cache,
const base::FilePath& temporary_file_directory);
~TruncateOperation();
// Performs the truncate operation on the file at drive path |file_path| to
// |length| bytes. Invokes |callback| when finished with the result of the
// operation. |callback| must not be null.
void Truncate(const base::FilePath& file_path,
int64 length,
const FileOperationCallback& callback);
private:
// Part of Truncate(). Called after EnsureFileDownloadedByPath() is complete.
void TruncateAfterEnsureFileDownloadedByPath(
int64 length,
const FileOperationCallback& callback,
FileError error,
const base::FilePath& local_file_path,
scoped_ptr<ResourceEntry> resource_entry);
// Part of Truncate(). Called after TruncateOnBlockingPool() is complete.
void TruncateAfterTruncateOnBlockingPool(
const std::string& local_id,
const FileOperationCallback& callback,
FileError error);
scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
OperationObserver* observer_;
internal::ResourceMetadata* metadata_;
internal::FileCache* cache_;
scoped_ptr<DownloadOperation> download_operation_;
// 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<TruncateOperation> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(TruncateOperation);
};
} // namespace file_system
} // namespace drive
#endif // CHROME_BROWSER_CHROMEOS_DRIVE_FILE_SYSTEM_TRUNCATE_OPERATION_H_
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