BeanFactoryAnnotationUtils.java 文件源码

/**
 * Check whether the named bean declares a qualifier of the given name.
 * @param qualifier the qualifier to match
 * @param beanName the name of the candidate bean
 * @param bf the {@code BeanFactory} from which to retrieve the named bean
 * @return {@code true} if either the bean definition (in the XML case)
 * or the bean's factory method (in the {@code @Bean} case) defines a matching
 * qualifier value (through {@code <qualifier>} or {@code @Qualifier})
 */
private static boolean isQualifierMatch(String qualifier, String beanName, ConfigurableListableBeanFactory bf) {
    if (bf.containsBean(beanName)) {
        try {
            BeanDefinition bd = bf.getMergedBeanDefinition(beanName);
            if (bd instanceof AbstractBeanDefinition) {
                AbstractBeanDefinition abd = (AbstractBeanDefinition) bd;
                AutowireCandidateQualifier candidate = abd.getQualifier(Qualifier.class.getName());
                if ((candidate != null && qualifier.equals(candidate.getAttribute(AutowireCandidateQualifier.VALUE_KEY))) ||
                        qualifier.equals(beanName) || ObjectUtils.containsElement(bf.getAliases(beanName), qualifier)) {
                    return true;
                }
            }
            if (bd instanceof RootBeanDefinition) {
                Method factoryMethod = ((RootBeanDefinition) bd).getResolvedFactoryMethod();
                if (factoryMethod != null) {
                    Qualifier targetAnnotation = factoryMethod.getAnnotation(Qualifier.class);
                    if (targetAnnotation != null && qualifier.equals(targetAnnotation.value())) {
                        return true;
                    }
                }
            }
        }
        catch (NoSuchBeanDefinitionException ex) {
            // Ignore - can't compare qualifiers for a manually registered singleton object
        }
    }
    return false;
}