AbstractBeanFactory.java 文件源码

@Override
public boolean isFactoryBean(String name) throws NoSuchBeanDefinitionException {
    String beanName = transformedBeanName(name);

    Object beanInstance = getSingleton(beanName, false);
    if (beanInstance != null) {
        return (beanInstance instanceof FactoryBean);
    }
    else if (containsSingleton(beanName)) {
        // null instance registered
        return false;
    }

    // No singleton instance found -> check bean definition.
    if (!containsBeanDefinition(beanName) && getParentBeanFactory() instanceof ConfigurableBeanFactory) {
        // No bean definition found in this factory -> delegate to parent.
        return ((ConfigurableBeanFactory) getParentBeanFactory()).isFactoryBean(name);
    }

    return isFactoryBean(beanName, getMergedLocalBeanDefinition(beanName));
}