Write custom FaceletFactory

It can be done via following steps:

1.  Create class, that dirived from DefaultFaceletFactory
2.  Overwrite logic
3.  Configure jsf to use created class.
   

   <context-param>
           <param-name>com.sun.faces.faceletFactory</param-name>
           <param-value>org.yes.cart.web.application.view.MultiStoreFaceletFactory</param-value>
   </context-param>