Examples of javax.persistence.EntityManager.unwrap()

javax.persistence.EntityManager.unwrap()
Return an object of the specified type to allow access to the provider-specific API. If the provider's EntityManager 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 EntityManager implementation class or an interface that it implements. @return an instance of the specified class @throws PersistenceException if the provider does notsupport the call.

        try {
            EntityManager em;
            em = getEntityManager();
            em.getTransaction().begin();


            Connection connection = em.unwrap(java.sql.Connection.class); // unwraps the Connection class.
            CallableStatement cs;


            em.getTransaction().commit();


            cs = connection.prepareCall("{call GetSearchedCourses(?, ?)}");

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                    EntityManager eM = null;
                    eM = getEntityManager();
                    eM.getTransaction().begin();
                    
                    // we are getting the connection string. 
                    Connection connection = eM.unwrap(java.sql.Connection.class); // unwraps the Connection class.
                    CallableStatement cs = null;
                    
                    eM.getTransaction().commit();

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        try {
            EntityManager em;
            em = getEntityManager();
            em.getTransaction().begin();


            Connection connection = em.unwrap(java.sql.Connection.class); // unwraps the Connection class.
            CallableStatement cs;


            em.getTransaction().commit();


            cs = connection.prepareCall("{call GetSemanticCourses(?)}");

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            org.apache.openjpa.persistence.OpenJPAEntityManagerSPI.class,
            org.apache.openjpa.kernel.DelegatingBroker.class,
            org.apache.openjpa.kernel.Broker.class
        };
        for (Class c : validCasts) {
            Object unwrapped = em.unwrap(c);
            assertTrue(c.isInstance(unwrapped));
        }
    }
}

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                    extensionClass = pu.getClassLoader().loadClass(injectionTypeName);
                } catch (ClassNotFoundException e) {
                    throw MESSAGES.cannotLoadFromJpa(e, injectionTypeName);
                }
                // get example of target object
                Object targetValueToInject = entityManager.unwrap(extensionClass);


                // build array of classes that proxy will represent.
                Class[] targetInterfaces = targetValueToInject.getClass().getInterfaces();
                Class[] proxyInterfaces = new Class[targetInterfaces.length + 1];  // include extra element for extensionClass
                boolean alreadyHasInterfaceClass = false;

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            org.apache.openjpa.persistence.OpenJPAEntityManagerSPI.class,
            org.apache.openjpa.kernel.DelegatingBroker.class,
            org.apache.openjpa.kernel.Broker.class
        };
        for (Class<?> c : validCasts) {
            Object unwrapped = em.unwrap(c);
            assertTrue(c.isInstance(unwrapped));
        }
    }
    
    /**

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            Properties.class,
            null,
        };
        for (Class<?> c : invalidCasts) {
            try {
                em.unwrap(c);
                fail("Expected to fail to unwarp with " + c);
            } catch (Exception e) {
                EntityTransaction txn = em.getTransaction();
                assertFalse(txn.isActive());
            }

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  public <T> T unwrap(Class<T> arg0)
  {
    EntityManager em = getPersistenceContext(false);
    try {
      return em.unwrap(arg0);
    } finally {
      if(em == detachedManager)
        em.clear();
    }
  }

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     */
    protected final <T> NaturalIdQuery<T> createNaturalIdQuery(Class<T> entityType) {
        final EntityManager entityManager = this.getEntityManager();
        final Session session;
        try {
            session = entityManager.unwrap(Session.class);
        }
        catch (IllegalStateException e) {
            throw new IllegalStateException("The DAO Method that calls createNaturalIdQuery must be annotated with @OpenEntityManager or @Transactional", e);
        }
        final NaturalIdLoadAccess naturalIdLoadAccess = session.byNaturalId(entityType);

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            List<WeakReference<EntityManager>> xpcs = SFSBXPCMap.getINSTANCE().getXPC(handle);
            if (xpcs == null)
                continue;
            for (WeakReference<EntityManager> xpc_ref : xpcs) {
                EntityManager xpc = xpc_ref.get();
                if (xpc != null && xpc.unwrap(EntityManagerMetadata.class).getScopedPuName().equals(puScopedName)) {
                    return xpc;
                }
            }
        }
        return null;

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