/**
* Eliminate the given type from the union type. (Performs a set complement operation.) Note that
* this operation is not robust and only works if this is a union of the given type with some
* other types that don't involve the given type.
*/
public ProducedType minus(ClassOrInterface ci) {
if (getDeclaration().equals(ci)) {
return new BottomType(getDeclaration().getUnit()).getType();
} else if (getDeclaration() instanceof UnionType) {
List<ProducedType> types = new ArrayList<ProducedType>();
for (ProducedType ct : getCaseTypes()) {
if (ct.getSupertype(ci) == null) {
addToUnion(types, ct.minus(ci));
}
}
UnionType ut = new UnionType(getDeclaration().getUnit());
ut.setCaseTypes(types);
return ut.getType();
} else {
return this;
}
}
public ProducedType getNonemptySequenceType(ProducedType pt) {
return pt.minus(getEmptyDeclaration()).getSupertype(getSequenceDeclaration());
}
public ProducedType getNonemptyIterableType(ProducedType pt) {
return pt.minus(getEmptyDeclaration()).getSupertype(getIterableDeclaration());
}
public ProducedType getNonemptyDefiniteType(ProducedType pt) {
return pt.minus(getNothingDeclaration()).minus(getEmptyDeclaration());
}