@Override
public IDomain computeImageDomain(List<IDomain> imageDomains) {
IDomain rawDomain = computeRawImageDomain(imageDomains);
for (IDomain domain : imageDomains) {
// Cannot cast ANY to META
if (domain.isInstanceOf(IDomain.ANY)) {
return IDomain.DATE;
}
if (domain.isInstanceOf(DomainMetaDomain.META)) {
return ((IDomainMetaDomain) domain).createMetaDomain(rawDomain);
}
}
//
return rawDomain;
}
@Override
public OperatorDiagnostic validateParameters(List<IDomain> imageDomains) {
if (imageDomains.isEmpty() || imageDomains.size() <= 1) {
return new OperatorDiagnostic("invalid NULLIF expression", HINT);
}
IDomain domain = imageDomains.get(0);
for (int i = 1; i < imageDomains.size(); i++) {
if (imageDomains.get(i).isInstanceOf(domain)) {
domain = imageDomains.get(i);
} else if (domain.isInstanceOf(imageDomains.get(i))) {
// ok
} else {
return new OperatorDiagnostic("mismatching NULLIF arguments", HINT);
}
}
return OperatorDiagnostic.IS_VALID;
}