public static String cssClassFaFor(final ObjectAction action) {
return facetValueIfAnyFor(action, CssClassFaFacet.class);
}
private static String facetValueIfAnyFor(ObjectAction action, Class<? extends SingleStringValueFacet> x) {
final SingleStringValueFacet singleStringValueFacet = action.getFacet(x);
return singleStringValueFacet != null ? singleStringValueFacet.value() : null;
}