AbstractAutowireCapableBeanFactory.java 文件源码

@Override
protected Class<?> predictBeanType(String beanName, RootBeanDefinition mbd, Class<?>... typesToMatch) {
    Class<?> targetType = mbd.getTargetType();
    if (targetType == null) {
        targetType = (mbd.getFactoryMethodName() != null ? getTypeForFactoryMethod(beanName, mbd, typesToMatch) :
                resolveBeanClass(mbd, beanName, typesToMatch));
        if (ObjectUtils.isEmpty(typesToMatch) || getTempClassLoader() == null) {
            mbd.setTargetType(targetType);
        }
    }
    // Apply SmartInstantiationAwareBeanPostProcessors to predict the
    // eventual type after a before-instantiation shortcut.
    if (targetType != null && !mbd.isSynthetic() && hasInstantiationAwareBeanPostProcessors()) {
        for (BeanPostProcessor bp : getBeanPostProcessors()) {
            if (bp instanceof SmartInstantiationAwareBeanPostProcessor) {
                SmartInstantiationAwareBeanPostProcessor ibp = (SmartInstantiationAwareBeanPostProcessor) bp;
                Class<?> predicted = ibp.predictBeanType(targetType, beanName);
                if (predicted != null && (typesToMatch.length != 1 || !FactoryBean.class.equals(typesToMatch[0]) ||
                        FactoryBean.class.isAssignableFrom(predicted))) {
                    return predicted;
                }
            }
        }
    }
    return targetType;
}