DisposableBeanAdapter.java 文件源码

/**
 * Search for all DestructionAwareBeanPostProcessors in the List.
 * @param postProcessors the List to search
 * @return the filtered List of DestructionAwareBeanPostProcessors
 */
private List<DestructionAwareBeanPostProcessor> filterPostProcessors(List<BeanPostProcessor> postProcessors) {
    List<DestructionAwareBeanPostProcessor> filteredPostProcessors = null;
    if (!CollectionUtils.isEmpty(postProcessors)) {
        filteredPostProcessors = new ArrayList<DestructionAwareBeanPostProcessor>(postProcessors.size());
        for (BeanPostProcessor postProcessor : postProcessors) {
            if (postProcessor instanceof DestructionAwareBeanPostProcessor) {
                filteredPostProcessors.add((DestructionAwareBeanPostProcessor) postProcessor);
            }
        }
    }
    return filteredPostProcessors;
}