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java.lang.Object org.springframework.beans.factory.config.BeanReferenceFactoryBean
public class BeanReferenceFactoryBean
FactoryBean that exposes an arbitrary target bean under a different name.
Usually, the target bean will reside in a different bean definition file, using this FactoryBean to link it in and expose it under a different name. Effectively, this corresponds to an alias for the target bean.
NOTE: For XML bean definition files, a <alias>
tag is available that effectively achieves the same.
Constructor Summary | |
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BeanReferenceFactoryBean()
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Method Summary | |
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Object |
getObject()
Return an instance (possibly shared or independent) of the object managed by this factory. |
Class |
getObjectType()
Return the type of object that this FactoryBean creates, or null
if not known in advance. |
boolean |
isSingleton()
Is the bean managed by this factory a singleton or a prototype? |
void |
setBeanFactory(BeanFactory beanFactory)
Callback that supplies the owning factory to a bean instance. |
void |
setTargetBeanName(String targetBeanName)
Set the name of the target bean, potentially in a different bean definition file. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public BeanReferenceFactoryBean()
Method Detail |
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public void setTargetBeanName(String targetBeanName)
public void setBeanFactory(BeanFactory beanFactory)
BeanFactoryAware
Invoked after population of normal bean properties but before an init callback like InitializingBean's afterPropertiesSet or a custom init-method.
setBeanFactory
in interface BeanFactoryAware
beanFactory
- owning BeanFactory (may not be null
).
The bean can immediately call methods on the factory.BeanInitializationException
public Object getObject() throws BeansException
FactoryBean
If this method returns null, the factory will consider the FactoryBean as not fully initialized and throw a corresponding FactoryBeanNotInitializedException.
getObject
in interface FactoryBean
null
; a null value
will be considered as an indication of incomplete initialization)
BeansException
FactoryBeanNotInitializedException
public Class getObjectType()
FactoryBean
null
if not known in advance. This allows to check for specific types
of beans without instantiating objects, for example on autowiring.
For a singleton, this should try to avoid singleton creation as far as possible; it should rather estimate the type in advance. For prototypes, returning a meaningful type here is advisable too.
This method can be called before this FactoryBean has been fully initialized. It must not rely on state created during initialization; of course, it can still use such state if available.
NOTE: Autowiring will simply ignore FactoryBeans that return null here. Therefore it is highly recommended to implement this method properly, using the current state of the FactoryBean.
getObjectType
in interface FactoryBean
null
if not known at the time of the callListableBeanFactory.getBeansOfType(java.lang.Class)
public boolean isSingleton()
FactoryBean
The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.
isSingleton
in interface FactoryBean
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