code: public List<WebAppFilterMapping> getFilterMappings(final String filterName) {
  		final Set<WebAppFilterMapping> webAppFilterMappings = filterMappings
  				.get(filterName);
  		if (webAppFilterMappings == null) {
  			return new ArrayList<>();
  		}
  		return new ArrayList<>(webAppFilterMappings);
  	}
docs: Returns filter mappings by filter name.
  
  @param filterName filter name
  @return array of filter mappings for requested filter name