public static boolean isObjectIdValid(String s) {
		if (s == null)
			return false;

		final int len = s.length();
		if (len != 24)
			return false;

		for (int i = 0; i < len; i++) {
			char c = s.charAt(i);
			if (c >= '0' && c <= '9')
				continue;
			if (c >= 'a' && c <= 'f')
				continue;
			if (c >= 'A' && c <= 'F')
				continue;

			return false;
		}

		return true;
	}