private BlockMirror queryMirror(URI id){
  ArgValidator.checkUri(id);
  BlockMirror mirror=_permissionsHelper.getObjectById(id,BlockMirror.class);
  ArgValidator.checkEntityNotNull(mirror,id,isIdEmbeddedInURL(id));
  return mirror;
}

private BlockMirror queryMirror ( URI id ) { ArgValidator . checkUri ( id ) ; BlockMirror mirror = _permissionsHelper . getObjectById ( id , BlockMirror . class ) ; ArgValidator . checkEntityNotNull ( mirror , id , isIdEmbeddedInURL ( id ) ) ; return mirror ; }
helper method for querying a mirror
