private static VirtualFile[] getFiles(ContentFolder[] sourceFolders) {
    ArrayList<VirtualFile> result = new ArrayList<>(sourceFolders.length);
    for (ContentFolder sourceFolder : sourceFolders) {
      final VirtualFile file = sourceFolder.getFile();
      if (file != null) {
        result.add(file);
      }
    }
    return VfsUtilCore.toVirtualFileArray(result);
  }
private static VirtualFile[] getFiles(ContentFolder[] sourceFolders)