protected void processFacets(FacesContext context, PhaseId phaseId) {
        if (getFacetCount() > 0) {
            for (UIComponent facet : getFacets().values()) {
                process(context, facet, phaseId);
            }
        }
    }
Enhanced version of the Faces UIData.
primefaces/src/main/java/org/primefaces/component/api/PrimeUIData.java