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/**
 * Copyright (c) 2005-2012
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 */
package com.github.javahao.util;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;

public final class SpringUtils implements BeanFactoryPostProcessor {

    private static ConfigurableListableBeanFactory beanFactory; // Spring应用上下文环境

    
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        SpringUtils.beanFactory = beanFactory;
    }

    /**
     * 获取对象
     * @param name bean名称
     * @param  返回类型
     * @return 结果
     * @throws BeansException 异常
     */
    public static  T getBean(String name) throws BeansException {
        return (T) beanFactory.getBean(name);
    }

    /**
     * 获取类型为requiredType的对象
     * @param clz 类
     * @param  泛型
     * @return 结果
     * @throws BeansException 异常
     */
    public static  T getBean(Class clz) throws BeansException {
        T result = (T) beanFactory.getBean(clz);
        return result;
    }

    /**
     * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
     * @param name 名称
     * @return boolean 结果
     */
    public static boolean containsBean(String name) {
        return beanFactory.containsBean(name);
    }

    /**
     * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
     *
     * @param name 名称
     * @return boolean 结果
     * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException 异常
     *
     */
    public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
        return beanFactory.isSingleton(name);
    }

    /**
     * @param name 名称
     * @return Class 注册对象的类型
     * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException 异常
     *
     */
    public static Class getType(String name) throws NoSuchBeanDefinitionException {
        return beanFactory.getType(name);
    }

    /**
     * 如果给定的bean名字在bean定义中有别名，则返回这些别名
     *
     * @param name 名称
     * @return 结果
     * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException 异常
     *
     */
    public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
        return beanFactory.getAliases(name);
    }

}