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// Copyright (c) 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_MEDIA_GALLERIES_FILEAPI_MTP_DEVICE_ASYNC_DELEGATE_H_
#define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MTP_DEVICE_ASYNC_DELEGATE_H_
#include "base/callback.h"
#include "base/files/file.h"
#include "base/memory/ref_counted.h"
#include "webkit/browser/fileapi/async_file_util.h"
namespace base {
class FilePath;
}
namespace net {
class IOBuffer;
}
// Asynchronous delegate for media transfer protocol (MTP) device to perform
// media device file system operations. Class that implements this
// delegate does the actual communication with the MTP device.
// The lifetime of the delegate is managed by the MTPDeviceMapService class.
// Member functions and callbacks run on the IO thread.
class MTPDeviceAsyncDelegate {
public:
// A callback to be called when GetFileInfo method call succeeds.
typedef base::Callback<
void(const base::File::Info& file_info)> GetFileInfoSuccessCallback;
// A callback to be called when ReadDirectory method call succeeds.
typedef base::Callback<
void(const fileapi::AsyncFileUtil::EntryList& file_list,
bool has_more)> ReadDirectorySuccessCallback;
// A callback to be called when GetFileInfo/ReadDirectory/CreateSnapshot
// method call fails.
typedef base::Callback<void(base::File::Error error)> ErrorCallback;
// A callback to be called when CreateSnapshotFile method call succeeds.
typedef base::Callback<
void(const base::File::Info& file_info,
const base::FilePath& local_path)> CreateSnapshotFileSuccessCallback;
// A callback to be called when ReadBytes method call succeeds.
typedef base::Callback<
void(const base::File::Info& file_info,
int bytes_read)> ReadBytesSuccessCallback;
struct ReadBytesRequest {
ReadBytesRequest(const std::string& device_file_relative_path,
net::IOBuffer* buf, int64 offset, int buf_len,
const ReadBytesSuccessCallback& success_callback,
const ErrorCallback& error_callback);
~ReadBytesRequest();
std::string device_file_relative_path;
scoped_refptr<net::IOBuffer> buf;
int64 offset;
int buf_len;
ReadBytesSuccessCallback success_callback;
ErrorCallback error_callback;
};
// Gets information about the given |file_path| and invokes the appropriate
// callback asynchronously when complete.
virtual void GetFileInfo(
const base::FilePath& file_path,
const GetFileInfoSuccessCallback& success_callback,
const ErrorCallback& error_callback) = 0;
// Enumerates the |root| directory contents and invokes the appropriate
// callback asynchronously when complete.
virtual void ReadDirectory(
const base::FilePath& root,
const ReadDirectorySuccessCallback& success_callback,
const ErrorCallback& error_callback) = 0;
// Copy the contents of |device_file_path| to |local_path|. Invokes the
// appropriate callback asynchronously when complete.
virtual void CreateSnapshotFile(
const base::FilePath& device_file_path,
const base::FilePath& local_path,
const CreateSnapshotFileSuccessCallback& success_callback,
const ErrorCallback& error_callback) = 0;
// Platform-specific implementations that are streaming don't create a local
// snapshot file. Blobs are instead FileSystemURL backed and read in a stream.
virtual bool IsStreaming() = 0;
// Reads up to |buf_len| bytes from |device_file_path| into |buf|. Invokes the
// appropriate callback asynchronously when complete. Only valid when
// IsStreaming() is true.
virtual void ReadBytes(
const base::FilePath& device_file_path,
net::IOBuffer* buf, int64 offset, int buf_len,
const ReadBytesSuccessCallback& success_callback,
const ErrorCallback& error_callback) = 0;
// Called when the
// (1) Browser application is in shutdown mode (or)
// (2) Last extension using this MTP device is destroyed (or)
// (3) Attached MTP device is removed (or)
// (4) User revoked the MTP device gallery permission.
// Ownership of |MTPDeviceAsyncDelegate| is handed off to the delegate
// implementation class by this call. This function should take care of
// cancelling all the pending tasks before deleting itself.
virtual void CancelPendingTasksAndDeleteDelegate() = 0;
protected:
// Always destruct this object via CancelPendingTasksAndDeleteDelegate().
virtual ~MTPDeviceAsyncDelegate() {}
};
typedef base::Callback<void(MTPDeviceAsyncDelegate*)>
CreateMTPDeviceAsyncDelegateCallback;
void CreateMTPDeviceAsyncDelegate(
const base::FilePath::StringType& device_location,
const CreateMTPDeviceAsyncDelegateCallback& callback);
#endif // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MTP_DEVICE_ASYNC_DELEGATE_H_
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