Media Gallery: Move MediaDeviceNotificationsLinux from content to chrome.

content/browser/media_device_notifications_linux.h

-// 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 CONTENT_BROWSER_MEDIA_DEVICE_NOTIFICATIONS_LINUX_H_
-#define CONTENT_BROWSER_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"
-#include "content/common/content_export.h"
-
-class FilePath;
-
-namespace content {
-
-class CONTENT_EXPORT 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 content
-
-#endif  // CONTENT_BROWSER_MEDIA_DEVICE_NOTIFICATIONS_LINUX_H_