public Permission getCollectivePermission(User user) { Permission permissions = new Permission(); Permission perm = userPermissionMap.get(user.getUserId()); if (perm != null) { permissions.addPermissions(perm); } for (String group : user.getGroups()) { perm = groupPermissionMap.get(group); if (perm != null) { permissions.addPermissions(perm); } } return permissions; }