[Heat] Reg Creation of resource based on another resource attribute value

Hi Team , I want to create the openstack subnet resource based on the openstack network resource's attribute STATUS value. i.e Create neutron subnet only when the neutron network status is ACTIVE . I can see currently the support of get_Attr function is not there in conditions section .Also the depends_on function accepts input as resource ids only .I cant pass a condition there . Is there any other way to implement the same .Please suggest . Thanks, A.Nanthini