PersistenceAnnotationBeanPostProcessor.java 文件源码

private InjectionMetadata buildPersistenceMetadata(final Class<?> clazz) {
    LinkedList<InjectionMetadata.InjectedElement> elements = new LinkedList<InjectionMetadata.InjectedElement>();
    Class<?> targetClass = clazz;

    do {
        final LinkedList<InjectionMetadata.InjectedElement> currElements =
                new LinkedList<InjectionMetadata.InjectedElement>();

        ReflectionUtils.doWithLocalFields(targetClass, new ReflectionUtils.FieldCallback() {
            @Override
            public void doWith(Field field) throws IllegalArgumentException, IllegalAccessException {
                if (field.isAnnotationPresent(PersistenceContext.class) ||
                        field.isAnnotationPresent(PersistenceUnit.class)) {
                    if (Modifier.isStatic(field.getModifiers())) {
                        throw new IllegalStateException("Persistence annotations are not supported on static fields");
                    }
                    currElements.add(new PersistenceElement(field, field, null));
                }
            }
        });

        ReflectionUtils.doWithLocalMethods(targetClass, new ReflectionUtils.MethodCallback() {
            @Override
            public void doWith(Method method) throws IllegalArgumentException, IllegalAccessException {
                Method bridgedMethod = BridgeMethodResolver.findBridgedMethod(method);
                if (!BridgeMethodResolver.isVisibilityBridgeMethodPair(method, bridgedMethod)) {
                    return;
                }
                if ((bridgedMethod.isAnnotationPresent(PersistenceContext.class) ||
                        bridgedMethod.isAnnotationPresent(PersistenceUnit.class)) &&
                        method.equals(ClassUtils.getMostSpecificMethod(method, clazz))) {
                    if (Modifier.isStatic(method.getModifiers())) {
                        throw new IllegalStateException("Persistence annotations are not supported on static methods");
                    }
                    if (method.getParameterTypes().length != 1) {
                        throw new IllegalStateException("Persistence annotation requires a single-arg method: " + method);
                    }
                    PropertyDescriptor pd = BeanUtils.findPropertyForMethod(bridgedMethod, clazz);
                    currElements.add(new PersistenceElement(method, bridgedMethod, pd));
                }
            }
        });

        elements.addAll(0, currElements);
        targetClass = targetClass.getSuperclass();
    }
    while (targetClass != null && targetClass != Object.class);

    return new InjectionMetadata(clazz, elements);
}