code: protected static String getFooterClass(UIComponent component)
      {
          if (component instanceof HtmlDataTable)
          {
              return ((HtmlDataTable) component).getFooterClass();
          }
          else
          {
              return (String) component.getAttributes().get(
                      org.apache.myfaces.shared.renderkit.JSFAttr.FOOTER_CLASS_ATTR);
          }
      }
docs: Gets the footerClass attribute of the given <code>UIComponent</code>.
  @param component the <code>UIComponent</code>.
  @return the footerClass attribute of the given <code>UIComponent</code>.