package com.njcn.utils;

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

/**
 * 静态获取Bean
 */
public class SpringContextUtil implements ApplicationContextAware {

	private static ApplicationContext applicationContext; 

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

	public static ApplicationContext getApplicationContext() {
		return applicationContext;
	}

    /**
     * 获取对象
     * @param name 对象名
     * @throws BeansException
     */
	public static Object getBean(String name) throws BeansException {
		try {
			return applicationContext.getBean(name);
		} catch (Exception e) {
			throw new RuntimeException("获取的Bean不存在！");
		}
	}

    /**
     *按对象类型获取对象
     * @param name 对象名
     * @param requiredType 对象类型
     * @throws BeansException
     */
	public static <T> T getBean(String name, Class<T> requiredType)  throws BeansException {
		return applicationContext.getBean(name, requiredType);
	}

    /**
     * 判断是否包含某对象
     * @param name 对象名
     */
	public static boolean containsBean(String name) {
		return applicationContext.containsBean(name);
	}

    /**
     *判断是否为单例对象
     * @param name 对象名
     */
	public static boolean isSingleton(String name)
			throws NoSuchBeanDefinitionException {
		return applicationContext.isSingleton(name);
	}

    /**
     *获取对象类型
     * @param name 对象名
     */
	public static Class<? extends Object> getType(String name)
			throws NoSuchBeanDefinitionException {
		return applicationContext.getType(name);
	}

    /**
     * 获取别名
     * @param name 对象名
     */
	public static String[] getAliases(String name)
			throws NoSuchBeanDefinitionException {
		return applicationContext.getAliases(name);
	}


}