} catch (IOException e) {
        throw new IllegalStateException("Failed to create directory", e);
      }
    }

    @Override
    File createTempFile(String prefix) throws IOException {
      return java.nio.file.Files.createTempFile(
              Paths.get(JAVA_IO_TMPDIR.value()),
              /* prefix= */ prefix,
              /* suffix= */ null,
              filePermissions.get())