org.springframework.context.support

Class ConversionServiceFactoryBean

java.lang.Object

org.springframework.context.support.ConversionServiceFactoryBean

All Implemented Interfaces:

FactoryBean<ConversionService>, InitializingBean

public class ConversionServiceFactoryBean
extends java.lang.Object
implements FactoryBean<ConversionService>, InitializingBean

A factory providing convenient access to a ConversionService configured with converters appropriate for most environments. Set the "converters" property to supplement the default converters.

This implementation creates a DefaultConversionService. Subclasses may override createConversionService() in order to return a GenericConversionService instance of their choosing.

Like all FactoryBean implementations, this class is suitable for use when configuring a Spring application context using Spring <beans> XML. When configuring the container with @Configuration classes, simply instantiate, configure and return the appropriate ConversionService object from a @Bean method.

Since:

3.0

Author:

Keith Donald, Juergen Hoeller, Chris Beams

Constructor Summary

Constructors

Constructor and Description
ConversionServiceFactoryBean()

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet() Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
protected GenericConversionService	createConversionService() Create the ConversionService instance returned by this factory bean.
ConversionService	getObject() Return an instance (possibly shared or independent) of the object managed by this factory.
java.lang.Class<? extends ConversionService>	getObjectType() Return the type of object that this FactoryBean creates, or null if not known in advance.
boolean	isSingleton() Is the object managed by this factory a singleton? That is, will FactoryBean.getObject() always return the same object (a reference that can be cached)?
void	setConverters(java.util.Set<?> converters) Configure the set of custom converter objects that should be added: implementing Converter, ConverterFactory, or GenericConverter.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ConversionServiceFactoryBean

public ConversionServiceFactoryBean()

Method Detail

setConverters

public void setConverters(java.util.Set<?> converters)

Configure the set of custom converter objects that should be added: implementing Converter, ConverterFactory, or GenericConverter.

afterPropertiesSet

public void afterPropertiesSet()

Description copied from interface: InitializingBean

Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).

This method allows the bean instance to perform initialization only possible when all bean properties have been set and to throw an exception in the event of misconfiguration.

Specified by:

afterPropertiesSet in interface InitializingBean

createConversionService

protected GenericConversionService createConversionService()

Create the ConversionService instance returned by this factory bean.

Creates a simple GenericConversionService instance by default. Subclasses may override to customize the ConversionService instance that gets created.

getObject

@Nullable
public ConversionService getObject()

Description copied from interface: FactoryBean

Return an instance (possibly shared or independent) of the object managed by this factory.

As with a BeanFactory, this allows support for both the Singleton and Prototype design pattern.

If this FactoryBean is not fully initialized yet at the time of the call (for example because it is involved in a circular reference), throw a corresponding FactoryBeanNotInitializedException.

As of Spring 2.0, FactoryBeans are allowed to return null objects. The factory will consider this as normal value to be used; it will not throw a FactoryBeanNotInitializedException in this case anymore. FactoryBean implementations are encouraged to throw FactoryBeanNotInitializedException themselves now, as appropriate.

Specified by:

getObject in interface FactoryBean<ConversionService>

Returns:

an instance of the bean (can be null)

See Also:

FactoryBeanNotInitializedException

getObjectType

public java.lang.Class<? extends ConversionService> getObjectType()

Description copied from interface: FactoryBean

Return the type of object that this FactoryBean creates, or null if not known in advance.

This allows one to check for specific types of beans without instantiating objects, for example on autowiring.

In the case of implementations that are creating a singleton object, this method 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.

Specified by:

getObjectType in interface FactoryBean<ConversionService>

Returns:

the type of object that this FactoryBean creates, or null if not known at the time of the call

See Also:

ListableBeanFactory.getBeansOfType(java.lang.Class<T>)

isSingleton

public boolean isSingleton()

Description copied from interface: FactoryBean

Is the object managed by this factory a singleton? That is, will FactoryBean.getObject() always return the same object (a reference that can be cached)?

NOTE: If a FactoryBean indicates to hold a singleton object, the object returned from getObject() might get cached by the owning BeanFactory. Hence, do not return true unless the FactoryBean always exposes the same reference.

The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.

NOTE: This method returning false does not necessarily indicate that returned objects are independent instances. An implementation of the extended SmartFactoryBean interface may explicitly indicate independent instances through its SmartFactoryBean.isPrototype() method. Plain FactoryBean implementations which do not implement this extended interface are simply assumed to always return independent instances if the isSingleton() implementation returns false.

The default implementation returns true, since a FactoryBean typically manages a singleton instance.

Specified by:

isSingleton in interface FactoryBean<ConversionService>

Returns:

whether the exposed object is a singleton

See Also:

FactoryBean.getObject(), SmartFactoryBean.isPrototype()