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/*
 *
 *      Copyright (c) 2018-2025, lengleng All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice,
 *  this list of conditions and the following disclaimer.
 *  Redistributions in binary form must reproduce the above copyright
 *  notice, this list of conditions and the following disclaimer in the
 *  documentation and/or other materials provided with the distribution.
 *  Neither the name of the pig4cloud.com developer nor the names of its
 *  contributors may be used to endorse or promote products derived from
 *  this software without specific prior written permission.
 *  Author: lengleng ([email protected])
 *
 */

package com.pig4cloud.plugin.excel.kit;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.annotation.Lazy;

import java.util.Map;

/**
 * @author lengleng
 * @date 2018/6/27 Spring 工具类
 */
@Slf4j
@Lazy(false)
public class SpringContextKit implements BeanFactoryPostProcessor, ApplicationContextAware, DisposableBean {

	private static ConfigurableListableBeanFactory beanFactory;

	private static ApplicationContext applicationContext = null;

	/**
	 * 取得存储在静态变量中的ApplicationContext.
	 */
	public static ApplicationContext getApplicationContext() {
		return applicationContext;
	}

	/**
	 * BeanFactoryPostProcessor, 注入Context到静态变量中.
	 */
	@Override
	public void postProcessBeanFactory(ConfigurableListableBeanFactory factory) throws BeansException {
		SpringContextKit.beanFactory = factory;
	}

	/**
	 * 实现ApplicationContextAware接口, 注入Context到静态变量中.
	 */
	@Override
	public void setApplicationContext(ApplicationContext applicationContext) {
		SpringContextKit.applicationContext = applicationContext;
	}

	public static ListableBeanFactory getBeanFactory() {
		return null == beanFactory ? applicationContext : beanFactory;
	}

	/**
	 * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
	 */
	@SuppressWarnings("unchecked")
	public static  T getBean(String name) {
		return (T) getBeanFactory().getBean(name);
	}

	/**
	 * 从静态变量applicationContext中取得Bean, Map
	 */
	public static  Map getBeansOfType(Class type) {
		return getBeanFactory().getBeansOfType(type);
	}

	/**
	 * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
	 */
	public static  T getBean(Class requiredType) {
		return getBeanFactory().getBean(requiredType);
	}

	/**
	 * 清除SpringContextKit中的ApplicationContext为Null.
	 */
	public static void clearHolder() {
		if (log.isDebugEnabled()) {
			log.debug("清除SpringContextKit中的ApplicationContext:" + applicationContext);
		}
		applicationContext = null;
	}

	/**
	 * 发布事件
	 * @param event
	 */
	public static void publishEvent(ApplicationEvent event) {
		if (applicationContext == null) {
			return;
		}
		applicationContext.publishEvent(event);
	}

	/**
	 * 实现DisposableBean接口, 在Context关闭时清理静态变量.
	 */
	@Override
	public void destroy() {
		SpringContextKit.clearHolder();
	}

}