| // Copyright (c) 2006-2008 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. |
| |
| // This module provides a way to monitor a directory for changes. |
| |
| #ifndef BASE_DIRECTORY_WATCHER_H_ |
| #define BASE_DIRECTORY_WATCHER_H_ |
| |
| #include "base/basictypes.h" |
| #include "base/ref_counted.h" |
| |
| class FilePath; |
| |
| // This class lets you register interest in changes on a directory. |
| // The delegate will get called whenever a file is added or changed in the |
| // directory. |
| class DirectoryWatcher { |
| public: |
| class Delegate { |
| public: |
| virtual void OnDirectoryChanged(const FilePath& path) = 0; |
| }; |
| |
| DirectoryWatcher(); |
| ~DirectoryWatcher() {} |
| |
| // Register interest in any changes in the directory |path|. |
| // OnDirectoryChanged will be called back for each change within the dir. |
| // If |recursive| is true, the delegate will be notified for each change |
| // within the directory tree starting at |path|. Returns false on error. |
| // |
| // Note: on Windows you may got more notifications for non-recursive watch |
| // than you expect, especially on versions earlier than Vista. The behavior |
| // is consistent on any particular version of Windows, but not across |
| // different versions. |
| bool Watch(const FilePath& path, Delegate* delegate, bool recursive) { |
| return impl_->Watch(path, delegate, recursive); |
| } |
| |
| // Used internally to encapsulate different members on different platforms. |
| class PlatformDelegate : public base::RefCounted<PlatformDelegate> { |
| public: |
| virtual ~PlatformDelegate() {} |
| virtual bool Watch(const FilePath& path, Delegate* delegate, |
| bool recursive) = 0; |
| }; |
| |
| private: |
| scoped_refptr<PlatformDelegate> impl_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DirectoryWatcher); |
| }; |
| |
| #endif // BASE_DIRECTORY_WATCHER_H_ |