code: public static String convert(final Object _value) throws EFapsException {
          String ret = null;
          if (_value instanceof String) {
              ret = (String) _value;
          } else if (_value instanceof Instance) {
              ret = ((Instance) _value).getOid();
          } else if (_value instanceof Number) {
              ret = ((Number) _value).toString();
          } else if (_value instanceof LocalDate) {
              ret = ((LocalDate) _value).toString();
          } else {
              LOG.warn("No specific converter defined for: {}", _value);
              ret = String.valueOf(_value);
          }
          return ret;
      }
docs: Convert.
  
  @param _value the value
  @return the string
  @throws EFapsException