code: public void addNestedDTO(JavaClass<?> entity, JavaClassSource nestedDTO)
     {
        DTOPair dtoPair = dtos.containsKey(entity) ? dtos.get(entity) : new DTOPair();
        dtoPair.nestedDTO = nestedDTO;
        dtos.put(entity, dtoPair);
     }
docs: Registers the nested DTO created for a JPA entity
  
  @param entity The JPA entity
  @param nestedDTO The nested DTO created for the JPA entity