checks whether a dualinputoperator is correctly connected . in case that the contract is incorrectly connected a runtimeexception is thrown . concode_field_sep Set<Operator<?>> visitedNodes concode_field_sep void checkBulkIteration concode_elem_sep void postVisit concode_elem_sep void checkFileDataSink concode_elem_sep boolean preVisit concode_elem_sep void checkDataSink concode_elem_sep void checkFileDataSource concode_elem_sep void check concode_elem_sep void checkSingleInputContract
void function ( DualInputOperator < ? , ? , ? , ? > arg0 ) { Operator < ? > loc0 = arg0 . getFirstInput ( ) ; Operator < ? > loc1 = arg0 . getSecondInput ( ) ; if ( loc0 == null || loc1 == null ) { throw new MissingChildException ( ) ; } }