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package com.github.xiaoyuge5201.prop;

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

import java.util.Map;

/**
 * @author xiaoyuge
 */
public class SpringContextUtil implements ApplicationContextAware {

    /**
     *
     */
    private static ApplicationContext applicationContext;
  
    /** 
     * 实现ApplicationContextAware接口的回调方法，设置上下文环境 
     *  
     * @param applicationContext 上下文
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) {
        SpringContextUtil.applicationContext = applicationContext;  
    }  
  
    /** 
     * @return ApplicationContext 
     */  
    public static ApplicationContext getApplicationContext() {
        return applicationContext;  
    }  
  
    /** 
     * 获取对象 
     * 这里重写了bean方法，起主要作用 
     * @param name 
     * @return Object 一个以所给名字注册的bean的实例 
     * @throws BeansException
     */  
    public static Object getBean(String name) throws BeansException {
        return applicationContext.getBean(name);
    }

    /**
     * 根据类型获取bean
     *
     * @param clazz bean类型
     * @return 指定类型的bean
     */
    public static  T getBean(Class clazz) {
        T t = null;
        Map map = applicationContext.getBeansOfType(clazz);
        for (Map.Entry entry : map.entrySet()) {
            t = entry.getValue();
        }
        return t;
    }

    /**
     * 是否包含bean
     *
     * @param beanName bean名字
     * @return boolean，是否包含指定名字的bean
     */
    public static boolean containsBean(String beanName) {
        return applicationContext.containsBean(beanName);
    }

    /**
     * 是否是单例
     *
     * @param beanName bean名字
     * @return boolean， 是否是单例
     */
    public static boolean isSingleton(String beanName) {
        return applicationContext.isSingleton(beanName);
    }

    /**
     * bean的类型
     *
     * @param beanName bean名字
     * @return bean的类型
     */
    public static Class getType(String beanName) {
        return applicationContext.getType(beanName);
    }
}