RTC: How I capture visibility component of Streams using Advisor operation?

I am creating an Advisor to control and manage the access the components of Streams in RTC. In Streams, how I capture the visibility of components? See part of code:

public void run(AdvisableOperation operation, IProcessConfigurationElement advisorConfiguration, IAdvisorInfoCollector collector,
            IProgressMonitor monitor)
        throws TeamRepositoryException
    {
IRepositoryItemService repo = getService(IRepositoryItemService.class);
        IAccessGroupService groupService = getService(IAccessGroupService.class);
        IComponentService ics = getService(IComponentService.class);
        Class<?> classe = operation.getOperationData().getClass();
        Object data = operation.getOperationData();
        if (data instanceof IComponentModificationData)
            {
            IComponentModificationData modificationData = (IComponentModificationData) data;
            .......


            }

}