How To Improve Conditional Logic With Java 8

I'm in the process of learning Java 8 and I wanted to know if there was a clean way to re-write the below code more efficiently in Java 8:

public static Map<String, Character> parseOrg(String org) {
    Map<String, Character> map = new HashMap<String, Character>();
    if (org != null && !org.isEmpty()) {
        String modifiedString = trimOrg(org); //private method to substring
        if (org.length() == 4) {
            doX(); //private method to populate map
        } else if (org.length == 3) {
            doX(); //private method to populate map
        } else if (org.length == 2) {
            doX(); //private method to populate map
        } else if (org.length == 1) {
            doX(); //private method to populate map
        }
    } else {
        LOG.error("Null org provided");
    }
    return map;
}