code: @SuppressWarnings("unchecked")
      protected final void addExtractors(Object[][] pAttrExtractors) {
          for (Object[] pAttrExtractor : pAttrExtractors) {
              extractorMap.put((String) pAttrExtractor[0],
                               (AttributeExtractor<T>) pAttrExtractor[1]);
          }
      }
docs: Add given extractors to the map. Should be called by a subclass from within init()
  
  @param pAttrExtractors extractors