presto-parser/src/main/java/io/prestosql/sql/tree/PrincipalSpecification.java/PrincipalSpecification/PrincipalSpecification
class PrincipalSpecification:    public PrincipalSpecification(Type type, Identifier name)
    {
        this.type = requireNonNull(type, "type is null");
        this.name = requireNonNull(name, "name is null");
    }