Recursive get the menu bar

@Override 
<?> Public BaseResponse listChildSort () { 
    // Find all the top-level menu 
    List <SysPermission> sysPermissionList = sysPermissionMapper.selectByParentId (0); 
    List <Children> childrenList = Lists.newArrayList (); 
    for (SysPermission sysPermission: sysPermissionList) { 
        // add the next menu and the lower menu recursion set 
        childrenList.add (listChild (sysPermission)); 
    } 
    IF (childrenList.size () == 0) { 
        return BaseResponse.createByError ( "no data"); 
    } 
    BaseResponse.createBySuccess return (childrenList); 
} 
Private Children listChild (sysPermission sysPermission) { 
    // recursive new objects 
    Children Children Children new new = (); 
    // Name Id and the current menu stored into the object
    children.setId (sysPermission.getId () + ""); 
    children.setName (sysPermission.getName ()); 
    menu // Find the previous menu as the current menu ID 
    List <SysPermission> sysPermissionList = sysPermissionMapper.selectByParentId ( sysPermission.getId ( ) .intValue ()); 
    List <Children> childrenList Lists.newArrayList = (); 
    // traverse the lower menu 
    for (SysPermission sysPermissionChild: sysPermissionList) { 
        // recursive sub-menu, the menu set and stored in the lower 
        childrenList.add (listChild ( sysPermissionChild)); 
    } 
    // set the lower menus stored into recursive objects 
    children.setChildren (childrenList.size ()> 0 childrenList:? null); 
    return Children; 
}