@Nullable
  private Pair<Set<String>, Set<String>> getAllRoots(boolean includeSourceRoots) {
    if (myProject.isDefault()) return null;

    final Set<String> recursive = new HashSet<String>();
    final Set<String> flat = new HashSet<String>();

    final String projectFilePath = myProject.getProjectFilePath();
    final File projectDirFile = new File(projectFilePath).getParentFile();
    if (projectDirFile != null && projectDirFile.getName().equals(Project.DIRECTORY_STORE_FOLDER)) {
      recursive.add(projectDirFile.getAbsolutePath());
    } else {
      flat.add(projectFilePath);
      final VirtualFile workspaceFile = myProject.getWorkspaceFile();
      if (workspaceFile != null) {
        flat.add(workspaceFile.getPath());
      }
    }

    for (WatchedRootsProvider extension :
        Extensions.getExtensions(WatchedRootsProvider.EP_NAME, myProject)) {
      recursive.addAll(extension.getRootsToWatch());
    }

    final Module[] modules = ModuleManager.getInstance(myProject).getModules();
    for (Module module : modules) {
      flat.add(module.getModuleFilePath());

      final ModuleRootManager moduleRootManager = ModuleRootManager.getInstance(module);

      addRootsToTrack(moduleRootManager.getContentRootUrls(), recursive, flat);

      if (includeSourceRoots) {
        addRootsToTrack(moduleRootManager.getSourceRootUrls(), recursive, flat);
      }

      final OrderEntry[] orderEntries = moduleRootManager.getOrderEntries();
      for (OrderEntry entry : orderEntries) {
        if (entry instanceof LibraryOrSdkOrderEntry) {
          final LibraryOrSdkOrderEntry libSdkEntry = (LibraryOrSdkOrderEntry) entry;
          for (OrderRootType orderRootType : OrderRootType.getAllTypes()) {
            addRootsToTrack(libSdkEntry.getRootUrls(orderRootType), recursive, flat);
          }
        }
      }
    }

    return Pair.create(recursive, flat);
  }