code: public void addFile(
          String loaderPath,
          URL file
      ) {
          List list = (List) filesMap.get(loaderPath);
  
          if (list == null) {
              list = new ArrayList();
              filesMap.put(
                  loaderPath,
                  list
              );
          }
  
          list.add(file);
      }
docs: add a file to the given loader
  
  @param loaderPath the path of the loader
  @param file the jar file to add