Add some common interfaces

[John Cook]

Could you create a common interface for all the *QueryFactory implementations? Something like proposed in http://source.mysema.com/forum/mvnforum/viewthread_thread,2973.
It could make switching for example from HibernateQueryFactory to JPAQueryFactory smoother for people using dependency injection.

Also, what about adding method getMetadata() to Query interface? All top-level Query implementations have this method, and for SubQuery implementations, it could be implemented if there is no reason to keep it hidden.

[Timo Westkämper (timo-westkamper)]

Fix commited :

/**
 * Common interface for QueryFactory implementations
 *
 * @author tiwe
 *
 * @param <Q>
 * @param <SQ>
 */
public interface QueryFactory<Q extends Query<?>, SQ extends Detachable> {
    /**
     * Create a new Query
     *
     * @return
     */
    Q query();

    /**
     * Create a new Sub query
     *
     * @return
     */
    SQ subQuery();
}

[Timo Westkämper (timo-westkamper)]

Released in 2.2.2