smartinstantiationawarebeanpostprocessor.java

spring api 源代码

/*
 * Copyright 2002-2007 the original author or authors.
 *
 * 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 org.springframework.beans.factory.config;

import java.lang.reflect.Constructor;

import org.springframework.beans.BeansException;

/**
 * Extension of the {@link InstantiationAwareBeanPostProcessor} interface,
 * adding a callback for predicting the eventual type of a processed bean.
 *
 * <p><b>NOTE:</b> This interface is a special purpose interface, mainly for
 * internal use within the framework. In general, application-provided
 * post-processors should simply implement the plain {@link BeanPostProcessor}
 * interface or derive from the {@link InstantiationAwareBeanPostProcessorAdapter}
 * class. New methods might be added to this interface even in point releases.
 *
 * @author Juergen Hoeller
 * @since 2.0.3
 * @see InstantiationAwareBeanPostProcessorAdapter
 */
public interface SmartInstantiationAwareBeanPostProcessor extends InstantiationAwareBeanPostProcessor {

	/**
	 * Predict the type of the bean to be eventually returned from this
	 * processor's {@link #postProcessBeforeInstantiation} callback.
	 * @param beanClass the raw class of the bean
	 * @param beanName the name of the bean
	 * @return the type of the bean, or <code>null</code> if not predictable
	 * @throws org.springframework.beans.BeansException in case of errors
	 */
	Class predictBeanType(Class beanClass, String beanName) throws BeansException;

	/**
	 * Determine the constructor to use for the given bean.
	 * @param beanClass the raw class of the bean
	 * @param beanName the name of the bean
	 * @return the constructor to use, or <code>null</code> if none specified
	 * @throws org.springframework.beans.BeansException in case of errors
	 */
	Constructor determineConstructor(Class beanClass, String beanName) throws BeansException;

}