spring源码 HierarchicalBeanFactory接口

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。

　　

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 * 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
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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);

}