question: private void addToMap ( HashMap < OperatorPair , AffinityRule > affinitiesMap , AffinityRule rule , OperatorPair operators ) { OperatorMeta operator1 = getOperatorMeta ( operators . first ) ; OperatorMeta operator2 = getOperatorMeta ( operators . second ) ; if ( operator1 == null || operator2 == null ) { if ( operator1 == null && operator2 == null ) { throw new ValidationException ( String . format ( "Operators %s & %s specified in affinity rule are not part of the dag" , operators . first , operators . second ) ) ; } throw new ValidationException ( String . format ( "Operator %s specified in affinity rule is not part of the dag" , operator1 == null ? operators . first : operators . second ) ) ; } affinitiesMap . put ( operators , rule ) ; }
target:  Validates that operators in Affinity Rule are valid: Checks that operator names are part of the dag and adds them to map of rules