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/**
 *
 */
package xin.xihc.jba;

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

import java.lang.annotation.Annotation;
import java.util.Map;

/**
 * @author Leo.Xi
 * @date 2018年1月24日
 * @since 0.0.1
 */
@Order(0)
@Component
public class SpringContextUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext; // Spring应用上下文环境

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 实现了ApplicationContextAware 接口，必须实现该方法；
     * 通过传递applicationContext参数初始化成员变量applicationContext
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextUtil.applicationContext = applicationContext;
    }

    /**
     * 根据名称获取Bean
     *
     * @param name bean的名称
     * @return
     */
    public static Object getBean(String name) {
        return applicationContext.getBean(name);
    }

    /**
     * 根据类型获取Bean
     *
     * @param clazz bean的类型
     * @return bean的实例
     */
    public static  T getBean(Class clazz) {
        return applicationContext.getBean(clazz);
    }

    /**
     * 获取Bean，根据名称&类型
     *
     * @param name  bean名称
     * @param clazz bean的类型
     * @return bean的实例
     */
    public static  T getBean(String name, Class clazz) {
        return applicationContext.getBean(name, clazz);
    }

    /**
     * 获取带有注解的Bean
     *
     * @param annotationType 注解类型
     * @return
     */
    public static Map getBeansWithAnnotation(Class annotationType) {
        return applicationContext.getBeansWithAnnotation(annotationType);
    }

}