base/files/file_path_watcher_mac.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/files/file_path_watcher.h"
   6 #include "base/files/file_path_watcher_kqueue.h"
   7
   8 #if !defined(OS_IOS)
   9 #include "base/files/file_path_watcher_fsevents.h"
  10 #endif
  11
  12 namespace base {
  13
  14 namespace {
  15
  16 class FilePathWatcherImpl : public FilePathWatcher::PlatformDelegate {
  17  public:
  18   bool Watch(const FilePath& path,
  19              bool recursive,
  20              const FilePathWatcher::Callback& callback) override {
  21     // Use kqueue for non-recursive watches and FSEvents for recursive ones.
  22     DCHECK(!impl_.get());
  23     if (recursive) {
  24       if (!FilePathWatcher::RecursiveWatchAvailable())
  25         return false;
  26 #if !defined(OS_IOS)
  27       impl_ = new FilePathWatcherFSEvents();
  28 #endif  // OS_IOS
  29     } else {
  30       impl_ = new FilePathWatcherKQueue();
  31     }
  32     DCHECK(impl_.get());
  33     return impl_->Watch(path, recursive, callback);
  34   }
  35
  36   void Cancel() override {
  37     if (impl_.get())
  38       impl_->Cancel();
  39     set_cancelled();
  40   }
  41
  42   void CancelOnMessageLoopThread() override {
  43     if (impl_.get())
  44       impl_->Cancel();
  45     set_cancelled();
  46   }
  47
  48  protected:
  49   ~FilePathWatcherImpl() override {}
  50
  51   scoped_refptr<PlatformDelegate> impl_;
  52 };
  53
  54 }  // namespace
  55
  56 FilePathWatcher::FilePathWatcher() {
  57   impl_ = new FilePathWatcherImpl();
  58 }
  59
  60 }  // namespace base