code: public Stream<T> asStream() {
          if (modelType == null) {
              throw new IllegalArgumentException("modelType can be not null");
          }
  
          if (fromFile == null && fromStream == null) {
              throw new IllegalArgumentException("Excel source not is null");
          }
  
          if (fromFile != null) {
              return ReaderFactory.readByFile(this);
          } else {
              return ReaderFactory.readByStream(this);
          }
      }
docs: Return the read result as a Stream
  
  @return Stream
  @throws ReaderException Thrown when an exception occurs during reading