code: private byte[] getClassDigest(File directory, String name) {
      String baseName = getBaseFileName(name);
      File digestFile = new File(directory, baseName + DIGEST_EXTENSION);
      return getFileContents(digestFile);
    }
docs: Gets the MD5 digest of a class definition.
  @param directory The root of the directory tree containing the class.
  @param name The fully qualified name of the class.
  @return The MD5 digest of the class definition.