code: public boolean isReferencedByRoot() {
          if(rootBean) {
              return true;
          }
          for(Reference reference : references) {
              Instance parent = reference.getParent();
              if(parent.isReferencedByRoot()) {
                  return true;
              }
          }
          return false;
      }
docs: Return true if the dolphin bean instance is a root bean or is referenced by a root bean
  @return true if the dolphin bean instance is a root bean or is referenced by a root bean