public M removeNullValueAttrs ( ) { for ( Iterator < Entry < String , Object > > it = attrs . entrySet ( ) . iterator ( ) ; it . hasNext ( ) ; ) { Entry < String , Object > e = it . next ( ) ; if ( e . getValue ( ) == null ) { it . remove ( ) ; _getModifyFlag ( ) . remove ( e . getKey ( ) ) ; } } return ( M ) this ; }
Remove attributes if it is null .