JPA Criteria: Safe JPA Criteria for Enum

enum FooType:

public enum FooType {
  //...
}

Entity Foo (containing attribute FooType):

@Entity
public class Foo {

    protected FooType type;
    @Enumerated(EnumType.STRING)
    public FooType getType() { return type; }
    public void setType(FooType type) { this.type = type; }
}

DAO method to find all Foos by FooType:

public List findAllFooByType(FooType type) {
     CriteriaBuilder cb = getEntityManager().getCriteriaBuilder();
     CriteriaQuery cq = cb.createQuery(Foo.class);
     Root invitation = cq.from(Foo.class);
        cq.where( 
          cb.equal(invitation.get(Foo_.type), type));
        cq.select(invitation);
     TypedQuery typedQuery = getEntityManager().createQuery(cq);
     return typedQuery.getResultList();
}

References

http://blogs.oracle.com/Lance/entry/generating_the_jpa_2_0