public T visitNaryExpression ( NaryExpression elm , C context ) { if ( elm instanceof Coalesce ) return visitCoalesce ( ( Coalesce ) elm , context ) ; else if ( elm instanceof Concatenate ) return visitConcatenate ( ( Concatenate ) elm , context ) ; else if ( elm instanceof Except ) return visitExcept ( ( Except ) elm , context ) ; else if ( elm instanceof Intersect ) return visitIntersect ( ( Intersect ) elm , context ) ; else if ( elm instanceof Union ) return visitUnion ( ( Union ) elm , context ) ; else return null ; }
Visit a NaryExpression . This method will be called for every node in the tree that is a NaryExpression .