package com.fantaibao.config;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringContext implements ApplicationContextAware {


    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContext.applicationContext = applicationContext;
    }

    public static ApplicationContext getApplicationContext() {
        assertApplicationContext();
        return applicationContext;
    }

    public static <T> T getBean(String beanName) {
        assertApplicationContext();
        try {
            return (T) applicationContext.getBean(beanName);
        } catch (Exception e) {
            return null;
        }
    }

    public static <T> T getBean(Class<T> beanName) {
        assertApplicationContext();
        return (T) applicationContext.getBean(beanName);
    }

    private static void assertApplicationContext() {
        if (SpringContext.applicationContext == null) {
            throw new RuntimeException("applicaitonContext属性为null,请检查是否注入了SpringContextHolder!");
        }
    }

}