code: public void addFields(List<ModelFieldBean> modelFields) {
  		Assert.notNull(modelFields, "modelFields must not be null");
  
  		for (ModelFieldBean bean : modelFields) {
  			this.fields.put(bean.getName(), bean);
  		}
  	}
docs: Add all provided fields to the collection of fields
  
  @param modelFields collection of {@link ModelFieldBean}