code: protected static Integer getOriginalPosition(String[] ori) {
  
          if (ori != null && ori.length == 4) {
              return Integer.parseInt(ori[0]);
          }
  
          return null;
      }
docs: Assumes that ori is in the form "POS:REF:ALT_0(,ALT_N)*:ALT_IDX".
  
  @param ori
  @return