code: public boolean exists(final String resourceName) {
          final Loader myLoader = this.loader;
          final String normalizedName = myLoader.normalize(resourceName);
          if (normalizedName == null) {
              return false;
          }
          return myLoader.get(normalizedName).exists();
      }
docs: if exists this resource.
  
  @param resourceName resource name
  @return if exists
  @since 1.4.1