code: public static ArrayList<File> getFilesInDirectoryTree(File file, String includeMask) {
  		return getContentsInDirectoryTree(file, includeMask, true, false);
  	}
docs: Retrieves all files from a directory and its subdirectories
  matching the given mask.
  
  @param file directory
  @param includeMask mask to match
  @return a list containing the found files