public void addMeta(List<T> metas){
  if (metas != null) {
    if (mMeta == null) {
      mMeta=new ArrayList<>();
    }
    mMeta.addAll(metas);
  }
}

public void addMeta ( List < T > metas ) { if ( metas != null ) { if ( mMeta == null ) { mMeta = new ArrayList < > ( ) ; } mMeta . addAll ( metas ) ; } }
add list of meta - data to range object .
