code: protected Object handleColumnValue(final Object oldValue, final Database database) {
        final Object newValue = WktConversionUtils.handleColumnValue(oldValue, database, this);
        return newValue;
     }
docs: If the old value is a geometry or a Well-Known Text, convert it to the appropriate new value.
  Otherwise, this method returns the old value.
  
  @param oldValue
  the old value.
  @param database
  the database instance.
  
  @return the new value.