Examples of javax.persistence.Query.unwrap()

javax.persistence.Query.unwrap()
Return an object of the specified type to allow access to the provider-specific API. If the provider's Query implementation does not support the specified class, the PersistenceException is thrown. @param cls the class of the object to be returned. This isnormally either the underlying Query implementation class or an interface that it implements. @return an instance of the specified class @throws PersistenceException if the provider does not supportthe call.

            org.apache.openjpa.kernel.DelegatingQuery.class,
            org.apache.openjpa.kernel.Query.class,
            org.apache.openjpa.kernel.QueryImpl.class
        };
        for (Class<?> c : validCasts) {
            Object unwrapped = query.unwrap(c);
            assertTrue(c.isInstance(unwrapped));
        }
        em.close();
    }

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        };
        for (Class<?> c : invalidCasts) {
            try {
                em.getTransaction().begin();
                Query query = em.createQuery(QueryLanguages.LANG_SQL,"");
                query.unwrap(c);
                fail("Expected to fail to unwarp with invalid " + c);
            } catch (PersistenceException e) {
                EntityTransaction txn = em.getTransaction();
                assertTrue(txn.getRollbackOnly());
                txn.rollback();

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            org.apache.openjpa.kernel.DelegatingQuery.class,
            org.apache.openjpa.kernel.Query.class,
            org.apache.openjpa.kernel.QueryImpl.class
        };
        for (Class c : validCasts) {
            Object unwrapped = query.unwrap(c);
            assertTrue(c.isInstance(unwrapped));
        }
        em.close();
    }

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        };
        for (Class<?> c : invalidCasts) {
            try {
                em.getTransaction().begin();
                Query query = em.createQuery(QueryLanguages.LANG_SQL,"");
                query.unwrap(c);
                fail("Expected to fail to unwarp with invalid " + c);
            } catch (PersistenceException e) {
                EntityTransaction txn = em.getTransaction();
                assertTrue(txn.getRollbackOnly());
                txn.rollback();

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            org.apache.openjpa.kernel.DelegatingQuery.class,
            org.apache.openjpa.kernel.Query.class,
            org.apache.openjpa.kernel.QueryImpl.class
        };
        for (Class c : validCasts) {
            Object unwrapped = query.unwrap(c);
            assertTrue(c.isInstance(unwrapped));
        }
    }


    /**

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        };
        for (Class<?> c : invalidCasts) {
            try {
                em.getTransaction().begin();
                Query query = em.createQuery(QueryLanguages.LANG_SQL,"");
                query.unwrap(c);
                fail("Expected to fail to unwarp with invalid " + c);
            } catch (PersistenceException e) {
                EntityTransaction txn = em.getTransaction();
                assertTrue(txn.getRollbackOnly());
                txn.rollback();

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            org.apache.openjpa.kernel.DelegatingQuery.class,
            org.apache.openjpa.kernel.Query.class,
            org.apache.openjpa.kernel.QueryImpl.class
        };
        for (Class c : validCasts) {
            Object unwrapped = query.unwrap(c);
            assertTrue(c.isInstance(unwrapped));
        }
    }


    /**

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    @Test
    public void testQueryWithLazyFetchType() {
        
        Query q = em.createQuery("select o from " + FetchTypeTestEntity.class.getSimpleName() + " o");
        ((QueryNotifier) q.unwrap(org.datanucleus.store.query.Query.class)).addListener("foobar", new QueryListener() {
            @Override
            public void listen(String soqlQuery) {
                assertFalse(soqlQuery.toLowerCase().contains("lazyfetchfield"),
                        "Lazy fetch colums should not be loaded.");
            }

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    // Test that you can override the fetch type in subclasses
    @Test
    public void testQueryWithFetchTypeOverride() {
        
        Query q = em.createQuery("select o from " + FetchTypeOverrideEntity.class.getSimpleName() + " o");
        ((QueryNotifier) q.unwrap(org.datanucleus.store.query.Query.class)).addListener("foobar", new QueryListener() {
            @Override
            public void listen(String soqlQuery) {
                assertTrue(soqlQuery.toLowerCase().contains("lazyfetchfieldwithoverride__c"),
                        "Lazy fetch colums with Eager overrides should be loaded.");
                assertFalse(soqlQuery.toLowerCase().contains("lazyfetchfield__c"),

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            org.apache.openjpa.kernel.DelegatingQuery.class,
            org.apache.openjpa.kernel.Query.class,
            org.apache.openjpa.kernel.QueryImpl.class
        };
        for (Class c : validCasts) {
            Object unwrapped = query.unwrap(c);
            assertTrue(c.isInstance(unwrapped));
        }
    }


    /**

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