HierarchicalBeanFactory 表示的是这些 Bean 是有继承关系的，也就是每个Bean 有可能有父 Bean。
/* * Copyright 2002-2012 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.springframework.beans.factory; /** * Sub-interface implemented by bean factories that can be part * of a hierarchy. * 可以被作为分层结构中的一个部分的bean工厂实现 * <p>The corresponding {@code setParentBeanFactory} method for bean * factories that allow setting the parent in a configurable * fashion can be found in the ConfigurableBeanFactory interface. *那些允许以配置的方式设置其父工厂的bean工厂对应的方法setParentBeanFactory可以在接口setParent中找到 * @author Rod Johnson * @author Juergen Hoeller * @since 07.07.2003 * @see org.springframework.beans.factory.config.ConfigurableBeanFactory#setParentBeanFactory */ public interface HierarchicalBeanFactory extends BeanFactory { /** * Return the parent bean factory, or {@code null} if there is none.
返回BeanFactory，如果没有则返回Null */ BeanFactory getParentBeanFactory(); /** * Return whether the local bean factory contains a bean of the given name, * ignoring beans defined in ancestor contexts.
返回当前bean工厂上下文是否存在给定bean名字的bean,忽略定义在其继承层次中的工厂上下文 * <p>This is an alternative to {@code containsBean}, ignoring a bean * of the given name from an ancestor bean factory.
containsBean方法于此方法是二选一的，都忽略其继承层中的bean定义，只在当前层次中查找 * @param name the name of the bean to query * @return whether a bean with the given name is defined in the local factory * @see BeanFactory#containsBean */ boolean containsLocalBean(String name); }