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jrouter是一个围绕对象方法基于责任链（拦截器）模式设计的开源轻量级Java容器。它专注于方法的映射、调用、拦截和结果处理，采用基于配置和注解的方式来抽取和收集程序中对象的方法（method）以用于路由映射，HTTP控制器，RPC，各种应用等。

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/*
 * Copyright (C) 2010-2111 [email protected]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package net.jrouter.spring;

import net.jrouter.ObjectFactory;
import org.springframework.aop.framework.AopProxyUtils;
import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ConfigurableApplicationContext;

/**
 * 借由 springframework 的工厂对象创建新的对象实例。
 */
public class SpringObjectFactory implements ObjectFactory, ApplicationContextAware {

    /**
     * {@link AutowireCapableBeanFactory}对象。
     */
    protected AutowireCapableBeanFactory autowireCapableBeanFactory;

    /**
     * springframework 属性注入的策略；默认{@code byName}.
     *
     * @see AutowireCapableBeanFactory#AUTOWIRE_BY_NAME
     * @see AutowireCapableBeanFactory#AUTOWIRE_BY_TYPE
     * @see AutowireCapableBeanFactory#AUTOWIRE_CONSTRUCTOR
     * @see AutowireCapableBeanFactory#AUTOWIRE_NO
     */
    @lombok.Getter
    @lombok.Setter
    private int autowireMode = AutowireCapableBeanFactory.AUTOWIRE_BY_NAME;

    /**
     * Empty Constructor.
     */
    public SpringObjectFactory() {
        super();
    }

    /**
     * Constructor.
     *
     * @param autowireCapableBeanFactory {@link AutowireCapableBeanFactory}。
     */
    public SpringObjectFactory(AutowireCapableBeanFactory autowireCapableBeanFactory) {
        this.autowireCapableBeanFactory = autowireCapableBeanFactory;
    }

    /**
     * Constructor.
     *
     * @param applicationContext ApplicationContext对象。
     */
    public SpringObjectFactory(ApplicationContext applicationContext) {
        setApplicationContext(applicationContext);
    }

    @Override
    public  T newInstance(Class clazz) {
        if (AutowireCapableBeanFactory.AUTOWIRE_NO == autowireMode) {
            return autowireCapableBeanFactory.createBean(clazz);
        }
        return (T) autowireCapableBeanFactory.createBean(clazz, autowireMode, false);
    }

    @Override
    public final void setApplicationContext(ApplicationContext applicationContext) {
        autowireCapableBeanFactory = findAutoWiringBeanFactory(applicationContext);
    }

    /**
     * If the given context is assignable to AutowireCapableBeanFactory or contains a parent or a factory that is, then
     * set the autoWiringFactory appropriately.
     *
     * @param context the application context
     *
     * @return the bean factory
     */
    protected AutowireCapableBeanFactory findAutoWiringBeanFactory(ApplicationContext context) {
        if (context instanceof AutowireCapableBeanFactory) {
            // Check the context
            return (AutowireCapableBeanFactory) context;
        } else if (context instanceof ConfigurableApplicationContext) {
            // Try and grab the beanFactory
            return ((ConfigurableApplicationContext) context).getBeanFactory();
        } else if (context.getParent() != null) {
            // And if all else fails, try again with the parent context
            return findAutoWiringBeanFactory(context.getParent());
        }
        return null;
    }

    @Override
    public Class getClass(Object obj) {
        return AopProxyUtils.ultimateTargetClass(obj);
    }
}