Nested Collections

[Damian O' Neill]

Hi I was hoping you could help with the following.  I have a method that filters on a collection type, the collection contains multiple nested collections.  See below for an example of an instance expansion.

// networkServiceList.get(0).getServiceNetworkElements().get(0).getSwitchList().get(0).getServicePortList().get(0).getType().equals(L2PortType.UNI);

Can you clarify what is wrong with the method below.  

Thanks,

Damian.

    private List<NetworkService> getServicesWithUNIs(List<NetworkService> networkServiceList) {

        return select(networkServiceList,

                having(on(NetworkService.class).getServiceNetworkElements(),

                        having(on(ServiceNetworkElement.class).getSwitchList(),

                                having(on(ServiceSwitch.class).getServicePortList(),

                                        hasItem(having(on(ServicePort.class).getType(), equalTo(L2PortType.UNI)))))));

    }