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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 WEBKIT_FILEAPI_MEDIA_MTP_DEVICE_DELEGATE_H_
#define WEBKIT_FILEAPI_MEDIA_MTP_DEVICE_DELEGATE_H_
#include "base/memory/scoped_ptr.h"
#include "base/platform_file.h"
#include "webkit/fileapi/file_system_file_util.h"
namespace base {
class FilePath;
class SequencedTaskRunner;
class Time;
}
namespace fileapi {
// Delegate for media transfer protocol (MTP) device to perform media device
// isolated file system operations. Class that implements this delegate does
// the actual communication with the MTP device. ScopedMTPDeviceMapEntry class
// manages the lifetime of the delegate via MTPDeviceMapService class.
class MTPDeviceDelegate {
public:
// Returns information about the given file path.
virtual base::PlatformFileError GetFileInfo(
const base::FilePath& file_path,
base::PlatformFileInfo* file_info) = 0;
// Returns a pointer to a new instance of AbstractFileEnumerator to enumerate
// the file entries of |root| path. The instance needs to be freed by the
// caller, and its lifetime should not extend past when the current call
// returns to the main media task runner thread.
virtual scoped_ptr<FileSystemFileUtil::AbstractFileEnumerator>
CreateFileEnumerator(const base::FilePath& root,
bool recursive) = 0;
// Updates the temporary snapshot file contents given by |local_path| with
// media file contents given by |device_file_path| and also returns the
// metadata of the temporary file.
virtual base::PlatformFileError CreateSnapshotFile(
const base::FilePath& device_file_path,
const base::FilePath& local_path,
base::PlatformFileInfo* file_info) = 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 |MTPDeviceDelegate| is handed off to the delegate
// implementation class by this call. This function should take care of
// deleting itself on the right thread. This function should cancel all the
// pending requests before posting any message to delete itself.
// Called on the UI thread.
virtual void CancelPendingTasksAndDeleteDelegate() = 0;
protected:
// Always destruct this object via CancelPendingTasksAndDeleteDelegate().
virtual ~MTPDeviceDelegate() {}
};
} // namespace fileapi
#endif // WEBKIT_FILEAPI_MEDIA_MTP_DEVICE_DELEGATE_H_
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