I looked into my examples. Here some code. Please be aware it is client side code and you might need to use slightly different services. But I would assume you can do similar things in the server api. If you need the team repository, you can get to it from elements using .getOrigin(). I haven't tried to gt deeper into the process e.g. to find permissions etc.


    private static void dumpContributor(ITeamRepository teamRepository,
            IProcessArea processArea, IContributorHandle handle)
            throws TeamRepositoryException {
        IContributor contributor = (IContributor) teamRepository.itemManager()
                .fetchCompleteItem(handle, IItemManager.DEFAULT, null);
        System.out.print(": " + contributor.getUserId() + "\t"
                + contributor.getName() + "\t" + contributor.getEmailAddress()+ "\t");
        IProcessItemService processService = (IProcessItemService) teamRepository
                .getClientLibrary(IProcessItemService.class);
        IClientProcess process = processService.getClientProcess(processArea,
                null);
        IRole[] contributorRoles = process.getContributorRoles(contributor,
                processArea, null);
        for (int j = 0; j < contributorRoles.length; j++) {
            IRole role = (IRole) contributorRoles[j];
            System.out.print(role.getId() + " ");
        }
        System.out.println();
    }