@Override
 public UrlRewriteFilterDescriptor addFilter(String name) {
   UrlRewriteFilterDescriptor filter = newFilter();
   filter.name(name);
   addFilter(filter);
   return filter;
 }
 @Override
 public void addFilter(UrlRewriteFilterDescriptor descriptor) {
   filterList.add(descriptor);
   filterMap.put(descriptor.name(), descriptor);
 }