Putting the Criterions into List for 'OR' condition

Question

I have the requirement where I need to use Criterion for or condition. This Criterion will be created in loop. So I am adding the Criterion into a List. And outside of the loop I am adding these Criterion's into Criteria and typecasting the list(which contains the Criterion) into Criterion[] array.

List<Criterion> criterions = new ArrayList<Criterion>();
        for (XYZ xyz : xyzs) {

            Integer[] age = findMinAndMaxAgeXYZ(xyz);

            Date minAge = prepareDateByAge(age[0]);
            Date maxAge = prepareDateByAge(age[1]);
            // Ordering has been changed to fetch the records for 
            // between condition.
            criterions.add(Restrictions.between("dob", maxAge, minAge));
        }
        criteria.add(Restrictions.or((Criterion[]) criterions.toArray()));  

But it gives me exception

java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Lorg.hibernate.criterion.Criterion;  

Any other solution to add the Criterion as or instead of putting into the list.

Answer 1

toArray() returns an array of Object. What you need is an array of Criterion. So the correct method is:

Criterion[] array = criterions.toArray(new Criterion[criterions.size()]);

See the different return type between toArray() and toArray(T[])

Note that, in this case, it would be much easier to simply use a disjunction:

Disjunction disjunction = Restrictions.disjunction();
for (XYZ xyz : xyzs) {
    ...
    disjunction.add(Restrictions.between("dob", maxAge, minAge));
}
criteria.add(disjunction);