/**
* constructor
* order rights object to set roles ,resources, allow, deny
*
* $identity must have $identity->id and $identity->role
*
* $rights must have methods:
* set_roles
* set_allow
* set_deny
*
* @param Identity $identity
* @param Rights $rights
*/
public function __construct($identity, $rights)
{
// store identity
$this->_identity = $identity;
// let the rights set the vars on this
$rights->set_roles($this);
$rights->set_allow($this);
$rights->set_deny($this);
}