private boolean addExtractorOrDynamicValueAsFieldWriter ( List < Object > list , FieldExtractor extractor , String header , boolean commaMightBeNeeded ) { if ( extractor != null ) { String head = header ; if ( commaMightBeNeeded ) { head = "," + head ; } list . add ( new FieldWriter ( head , extractor ) ) ; return true ; } return commaMightBeNeeded ; }
If extractor is present this will combine the header and extractor into a FieldWriter allowing the FieldWriter to determine when and if to write the header value based on the given document s data . If a comma is needed it is appended to the header string before being passed to the FieldWriter .