public Iterator<PsiFile> getFiles(PackageElement packageElement) {
    ArrayList<PsiFile> psiFileList = new ArrayList<>();
    GlobalSearchScope scope = packageElement.getModule() != null ? GlobalSearchScope.moduleScope(packageElement.getModule()) :
                              GlobalSearchScope.projectScope(myProject);
    final PsiDirectory[] directories = packageElement.getPackage().getDirectories(scope);
    for (PsiDirectory directory : directories) {
      Iterator<PsiFile> files = myBuilder.getFiles(directory, false);
      while (files.hasNext()) {
        psiFileList.add(files.next());
      }
    }
    return psiFileList.iterator();
  }
public Iterator<PsiFile> getFiles(PackageElement packageElement)