file_manager: Move non-binding code to c/b/chromeos/file_manager

chrome/browser/chromeos/extensions/file_manager/file_watcher.h

-// Copyright 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_CHROMEOS_EXTENSIONS_FILE_MANAGER_FILE_WATCHER_H_
-#define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_FILE_WATCHER_H_
-
-#include <map>
-#include <string>
-
-#include "base/callback_forward.h"
-#include "base/files/file_path.h"
-#include "base/files/file_path_watcher.h"
-#include "base/memory/weak_ptr.h"
-
-namespace file_manager {
-
-// This class is used to watch changes in the given virtual path, remember
-// what extensions are watching the path.
-//
-// For local files, the class maintains a FilePathWatcher instance and
-// remembers what extensions are watching the path.
-//
-// For remote files (ex. files on Drive), the class just remembers what
-// extensions are watching the path. The actual file watching for remote
-// files is handled differently in EventRouter.
-class FileWatcher {
- public:
-  typedef base::Callback<void(bool success)> BoolCallback;
-
-  // Creates a FileWatcher associated with the virtual path.
-  explicit FileWatcher(const base::FilePath& virtual_path);
-
-  ~FileWatcher();
-
-  // Remembers that the extension of |extension_id| is watching the virtual
-  // path.
-  //
-  // If this function is called more than once with the same extension ID,
-  // the class increments the counter internally, and RemoveExtension()
-  // decrements the counter, and forgets the extension when the counter
-  // becomes zero.
-  void AddExtension(const std::string& extension_id);
-
-  // Forgets that the extension of |extension_id| is watching the virtual path,
-  // or just decrements the internal counter for the extension ID. See the
-  // comment at AddExtension() for details.
-  void RemoveExtension(const std::string& extension_id);
-
-  // Returns IDs of the extensions watching virtual_path. The returned list
-  // is sorted in the alphabetical order and contains no duplicates.
-  std::vector<std::string> GetExtensionIds() const;
-
-  // Returns the virtual path associated with the FileWatcher.
-  const base::FilePath& virtual_path() const { return virtual_path_; }
-
-  // Starts watching a local file at |local_path|. |file_watcher_callback|
-  // will be called when changes are notified.
-  //
-  // |callback| will be called with true, if the file watch is started
-  // successfully, or false if failed. |callback| must not be null.
-  void WatchLocalFile(
-      const base::FilePath& local_path,
-      const base::FilePathWatcher::Callback& file_watcher_callback,
-      const BoolCallback& callback);
-
- private:
-  // Called when a FilePathWatcher is created and started.
-  // |file_path_watcher| is NULL, if the watcher wasn't started successfully.
-  void OnWatcherStarted(const BoolCallback& callback,
-                        base::FilePathWatcher* file_path_watcher);
-
-  base::FilePathWatcher* local_file_watcher_;
-  base::FilePath virtual_path_;
-  // Map of extension-id to counter. See the comment at AddExtension() for
-  // why we need to count.
-  typedef std::map<std::string, int> ExtensionCountMap;
-  ExtensionCountMap extensions_;
-
-  // Note: This should remain the last member so it'll be destroyed and
-  // invalidate the weak pointers before any other members are destroyed.
-  base::WeakPtrFactory<FileWatcher> weak_ptr_factory_;
-};
-
-}  // namespace file_manager
-
-#endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_FILE_WATCHER_H_