public Collection<String> getFacesContextFactoryIterator()
    {
        if (umfacesContextFactories == null)
        {
            umfacesContextFactories = Collections.unmodifiableList(facesContextFactories);
        }
        return umfacesContextFactories;
    }
public Collection < String > getFacesContextFactoryIterator ( ) { if ( umfacesContextFactories == null ) { umfacesContextFactories = Collections . unmodifiableList ( facesContextFactories ) ; } return umfacesContextFactories ; }
@return Collection over FacesContextFactory class names