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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/file_path.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/platform_file.h"
#include "base/sequenced_task_runner_helpers.h"
#include "webkit/fileapi/file_system_file_util.h"
namespace base {
struct PlatformFileInfo;
class SequencedTaskRunner;
class Time;
}
namespace fileapi {
struct MTPDeviceDelegateDeleter;
// 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.
class MTPDeviceDelegate
: public base::RefCountedThreadSafe<MTPDeviceDelegate,
MTPDeviceDelegateDeleter> {
public:
// Returns information about the given file path.
virtual base::PlatformFileError GetFileInfo(
const 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 FileSystemFileUtil::AbstractFileEnumerator* CreateFileEnumerator(
const 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 PlatformFileError CreateSnapshotFile(
const FilePath& device_file_path,
const FilePath& local_path,
base::PlatformFileInfo* file_info) = 0;
// Returns TaskRunner on which the operation is performed.
virtual base::SequencedTaskRunner* GetMediaTaskRunner() = 0;
// Helper function to destruct the delegate object on UI thread.
virtual void DeleteOnCorrectThread() const = 0;
protected:
virtual ~MTPDeviceDelegate() {}
private:
friend struct MTPDeviceDelegateDeleter;
friend class base::DeleteHelper<MTPDeviceDelegate>;
friend class base::RefCountedThreadSafe<MTPDeviceDelegate,
MTPDeviceDelegateDeleter>;
};
struct MTPDeviceDelegateDeleter {
static void Destruct(const MTPDeviceDelegate* delegate) {
delegate->DeleteOnCorrectThread();
}
};
} // namespace fileapi
#endif // WEBKIT_FILEAPI_MEDIA_MTP_DEVICE_DELEGATE_H_
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