CriteriaBuilder order by result of operations

Question

Suppose the following entity:

Entity {
    Integer id;
    Boolean imported;
    Integer status;
}

The task is: When selecting entities those with imported = true AND status != 1 should go to the bottom of search result. It is also necessary to use CriteriaBuilder .

I decided to compute the value which will indicate them to be pulled down by the following expression: imported = true AND status != 1

If writing direct SQL it works as intended having a look:

SELECT .. FROM .. ORDER BY (imported = true AND status != 1) ASC

However I cannot transcode it in context of CriteriaBuilder

I tried to do it like this:

Predicate eqTruePredicate = cb.equal(root.get(Entity_.imported), true);
Predicate neqStatusPredicate = cb.notEqual(root.get(Entity_.status)), 1);

Predicate andExp = cb.and(eqTruePredicate, neqStatusPredicate);
order.add(0, new OrderImpl(cb.isTrue(andExp)));

The generated query is the following:

order by ( generatedAlias0.imported=:param2 ) and ( generatedAlias0.status<>:param3 ) asc

But when execute the exception is thrown saying: "unexpected AST node" pointing at token and

Is there a way to perform ordering by computed value using CriteriaBuilder and what would be necessary to be done?

Addition: Hibernate ORM version: 4.3.5

Answer 1

I managed to do it using CASE statement:

Expression<Integer> caseExp = cb.<Integer>selectCase()
    .when(
        cb.and(
            cb.equal(root.get(Entity_.imported), true),
            cb.notEqual(root.get(Entity_.status), 1)
        ),
        1
    )
    .otherwise(0);

order.add(0, cb.asc(caseExp));

This results into an ORDER BY statement like this:

order by case when ( entity.imported=true ) and ( entity.status<>1 ) then 1 else 0 end asc