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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.
// MediaDeviceNotificationsLinux listens for mount point changes and notifies
// the SystemMonitor about the addition and deletion of media devices.
#ifndef CHROME_BROWSER_MEDIA_GALLERY_MEDIA_DEVICE_NOTIFICATIONS_LINUX_H_
#define CHROME_BROWSER_MEDIA_GALLERY_MEDIA_DEVICE_NOTIFICATIONS_LINUX_H_
#pragma once
#include <map>
#include <set>
#include <string>
#include <utility>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/files/file_path_watcher.h"
#include "base/memory/ref_counted.h"
#include "base/system_monitor/system_monitor.h"
class FilePath;
namespace chrome {
class MediaDeviceNotificationsLinux
: public base::RefCountedThreadSafe<MediaDeviceNotificationsLinux> {
public:
explicit MediaDeviceNotificationsLinux(const FilePath& path);
// Must be called for MediaDeviceNotificationsLinux to work.
void Init();
protected:
// Avoids code deleting the object while there are references to it.
// Aside from the base::RefCountedThreadSafe friend class, and derived
// classes, any attempts to call this dtor will result in a compile-time
// error.
virtual ~MediaDeviceNotificationsLinux();
virtual void OnFilePathChanged(const FilePath& path);
private:
friend class base::RefCountedThreadSafe<MediaDeviceNotificationsLinux>;
class WatcherDelegate;
// (mount device, device id)
typedef std::pair<std::string,
base::SystemMonitor::DeviceIdType> MountDeviceAndId;
// Mapping of mount points to MountDeviceAndId.
typedef std::map<std::string, MountDeviceAndId> MountMap;
void InitOnFileThread();
// Parse the mtab file and find all changes.
void UpdateMtab();
// Read the mtab file entries into |mtab|.
void ReadMtab(MountMap* mtab);
// For a new device mounted at |mount_point|, see if it is a media device by
// checking for the existence of a DCIM directory.
// If it is a media device, return true, otherwise return false.
// Mac OS X behaves similarly, but this is not the only heuristic it uses.
// TODO(vandebo) Try to figure out how Mac OS X decides this.
bool IsMediaDevice(const std::string& mount_point);
// Add a media device with a given device and mount device. Assign it a device
// id as well.
void AddNewDevice(const std::string& mount_device,
const std::string& mount_point,
base::SystemMonitor::DeviceIdType* device_id);
// Remove a media device with a given device id.
void RemoveOldDevice(const base::SystemMonitor::DeviceIdType& device_id);
// Whether Init() has been called or not.
bool initialized_;
// Mtab file that lists the mount points.
const FilePath mtab_path_;
// Watcher for |mtab_path_|.
base::files::FilePathWatcher file_watcher_;
// Delegate to receive watcher notifications.
scoped_refptr<WatcherDelegate> watcher_delegate_;
// Mapping of relevent mount points and their corresponding mount devices.
// Keep in mind on Linux, a device can be mounted at multiple mount points,
// and multiple devices can be mounted at a mount point.
MountMap mtab_;
// The lowest available device id number.
base::SystemMonitor::DeviceIdType current_device_id_;
// Set of known file systems that we care about.
std::set<std::string> known_file_systems_;
DISALLOW_COPY_AND_ASSIGN(MediaDeviceNotificationsLinux);
};
} // namespace chrome
#endif // CHROME_BROWSER_MEDIA_GALLERY_MEDIA_DEVICE_NOTIFICATIONS_LINUX_H_
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