build the expression . concode_field_sep FilterFactory ff concode_elem_sep boolean unset concode_elem_sep Builder<? extends Expression> delegate concode_field_sep AddBuilder add concode_elem_sep boolean isUnset concode_elem_sep SubtractBuilder subtract concode_elem_sep FunctionBuilder function concode_elem_sep FunctionBuilder function concode_elem_sep PropertyNameBuilder property concode_elem_sep Builder<?> property concode_elem_sep ExpressionBuilder reset concode_elem_sep ExpressionBuilder reset concode_elem_sep DivideBuilder divide concode_elem_sep MultiplyBuilder multiply concode_elem_sep ExpressionBuilder unset concode_elem_sep LiteralBuilder literal concode_elem_sep Builder<?> literal
Expression function ( ) { if ( unset ) { return null ; } return delegate . build ( ) ; }