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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_WEBKIT_FILE_STREAM_READER_IMPL_H_
#define CHROME_BROWSER_CHROMEOS_DRIVE_WEBKIT_FILE_STREAM_READER_IMPL_H_
#include "base/basictypes.h"
#include "base/files/file_path.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "chrome/browser/chromeos/drive/drive_file_stream_reader.h"
#include "net/base/completion_callback.h"
#include "webkit/browser/blob/file_stream_reader.h"
namespace base {
class SequencedTaskRunner;
} // namespace base
namespace drive {
class ResourceEntry;
namespace internal {
// The implementation of webkit_blob::FileStreamReader for drive file system.
// webkit_blob::FileStreamReader does not provide a way for explicit
// initialization, hence the initialization of this class will be done lazily.
// Note that when crbug.com/225339 is resolved, this class will be also
// initialized explicitly.
class WebkitFileStreamReaderImpl : public webkit_blob::FileStreamReader {
public:
WebkitFileStreamReaderImpl(
const DriveFileStreamReader::FileSystemGetter& file_system_getter,
base::SequencedTaskRunner* file_task_runner,
const base::FilePath& drive_file_path,
int64 offset,
const base::Time& expected_modification_time);
virtual ~WebkitFileStreamReaderImpl();
// webkit_blob::FileStreamReader override.
virtual int Read(net::IOBuffer* buffer,
int buffer_length,
const net::CompletionCallback& callback) OVERRIDE;
virtual int64 GetLength(const net::Int64CompletionCallback& callback)
OVERRIDE;
private:
// Called upon the initialization completion of |stream_reader_|.
// Processes the result of the initialization with checking last
// modified time, and calls |callback| with net::Error code as its result.
void OnStreamReaderInitialized(
const net::CompletionCallback& callback,
int error,
scoped_ptr<ResourceEntry> entry);
// Part of Read(). Called after all the initialization process is completed.
void ReadAfterStreamReaderInitialized(
scoped_refptr<net::IOBuffer> buffer,
int buffer_length,
const net::CompletionCallback& callback,
int initialization_result);
// Part of GetLength(). Called after all the initialization process is
// completed.
void GetLengthAfterStreamReaderInitialized(
const net::Int64CompletionCallback& callback,
int initialization_result);
scoped_ptr<DriveFileStreamReader> stream_reader_;
const base::FilePath drive_file_path_;
const int64 offset_;
const base::Time expected_modification_time_;
// This is available only after initialize is done.
int64 file_size_;
// This should remain the last member so it'll be destroyed first and
// invalidate its weak pointers before other members are destroyed.
base::WeakPtrFactory<WebkitFileStreamReaderImpl> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(WebkitFileStreamReaderImpl);
};
} // namespace internal
} // namespace drive
#endif // CHROME_BROWSER_CHROMEOS_DRIVE_WEBKIT_FILE_STREAM_READER_IMPL_H_
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