package com.moral.util;

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

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


public class SpringContextUtils {

    private static ApplicationContext applicationContext;

    public SpringContextUtils() {
    }

    /**
     * 获取applicationContext对象
     *
     * @return
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }


    public static void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextUtils.applicationContext = applicationContext;
    }


    /**
     * 根据 bean 的 name 来查找对象
     *
     * @param beanName bean name
     * @param <T>
     * @return
     */
    @SuppressWarnings("unchecked")
	public static <T> T getBeanByName(String beanName) {
        return (T) applicationContext.getBean(beanName);
    }


    /**
     * 根据 bean 的 类型 来查找对象
     *
     * @param requiredType
     * @param <T>
     * @return
     */
    @SuppressWarnings("unchecked")
	public static <T> T getBeanByClass(Class<?> requiredType) {
        return (T) applicationContext.getBean(requiredType);
    }

    public static <T> Map<String, T> getBeansByClass(Class<T> cls) {
        return applicationContext.getBeansOfType(cls);
    }

    public static Map<String, Object> getBeansByAnnotation(Class<? extends Annotation> annotationCls) {
        return applicationContext.getBeansWithAnnotation(annotationCls);
    }

}