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 /*
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  * Copyright 2002-2010 the original author or authors.
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  *
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  * Licensed under the Apache License, Version 2.0 (the "License");
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  * you may not use this file except in compliance with the License.
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  * You may obtain a copy of the License at
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  *
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  *      http://www.apache.org/licenses/LICENSE-2.0
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  *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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package org.springframework.beans.factory.config;
Factory hook that allows for custom modification of new bean instances, e.g. checking for marker interfaces or wrapping them with proxies.

ApplicationContexts can autodetect BeanPostProcessor beans in their bean definitions and apply them to any beans subsequently created. Plain bean factories allow for programmatic registration of post-processors, applying to all beans created through this factory.

Typically, post-processors that populate beans via marker interfaces or the like will implement postProcessBeforeInitialization(java.lang.Object,java.lang.String), while post-processors that wrap beans with proxies will normally implement postProcessAfterInitialization(java.lang.Object,java.lang.String).

Author(s):
Juergen Hoeller
Since:
10.10.2003
See also:
InstantiationAwareBeanPostProcessor
DestructionAwareBeanPostProcessor
ConfigurableBeanFactory.addBeanPostProcessor(org.springframework.beans.factory.config.BeanPostProcessor)
BeanFactoryPostProcessor
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public interface BeanPostProcessor {
Apply this BeanPostProcessor to the given new bean instance before any bean initialization callbacks (like InitializingBean's afterPropertiesSet or a custom init-method). The bean will already be populated with property values. The returned bean instance may be a wrapper around the original.

Parameters:
bean the new bean instance
beanName the name of the bean
Returns:
the bean instance to use, either the original or a wrapped one; if null, no subsequent BeanPostProcessors will be invoked
Throws:
org.springframework.beans.BeansException in case of errors
See also:
org.springframework.beans.factory.InitializingBean.afterPropertiesSet()
Apply this BeanPostProcessor to the given new bean instance after any bean initialization callbacks (like InitializingBean's afterPropertiesSet or a custom init-method). The bean will already be populated with property values. The returned bean instance may be a wrapper around the original.

In case of a FactoryBean, this callback will be invoked for both the FactoryBean instance and the objects created by the FactoryBean (as of Spring 2.0). The post-processor can decide whether to apply to either the FactoryBean or created objects or both through corresponding bean instanceof FactoryBean checks.

This callback will also be invoked after a short-circuiting triggered by a InstantiationAwareBeanPostProcessor.postProcessBeforeInstantiation(java.lang.Class,java.lang.String) method, in contrast to all other BeanPostProcessor callbacks.

Parameters:
bean the new bean instance
beanName the name of the bean
Returns:
the bean instance to use, either the original or a wrapped one; if null, no subsequent BeanPostProcessors will be invoked
Throws:
org.springframework.beans.BeansException in case of errors
See also:
org.springframework.beans.factory.InitializingBean.afterPropertiesSet()
org.springframework.beans.factory.FactoryBean
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