org.springframework.beans.factory.config
Class SetFactoryBean

java.lang.Object
  extended by org.springframework.beans.factory.config.AbstractFactoryBean
      extended by org.springframework.beans.factory.config.SetFactoryBean
All Implemented Interfaces:
FactoryBean, InitializingBean

public class SetFactoryBean
extends AbstractFactoryBean

Simple factory for shared Set instances. Allows for central setup of Sets via the "set" element in XML bean definitions.

Since:
21.01.2003
Author:
Juergen Hoeller
See Also:
ListFactoryBean, MapFactoryBean

Field Summary
 
Fields inherited from class org.springframework.beans.factory.config.AbstractFactoryBean
logger
 
Constructor Summary
SetFactoryBean()
           
 
Method Summary
protected  Object createInstance()
          Template method that subclasses must override to construct the object returned by this factory.
 Class getObjectType()
          Return the type of object that this FactoryBean creates, or null if not known in advance.
 void setSourceSet(Set sourceSet)
          Set the source Set, typically populated via XML "set" elements.
 void setTargetSetClass(Class targetSetClass)
          Set the class to use for the target Set.
 
Methods inherited from class org.springframework.beans.factory.config.AbstractFactoryBean
afterPropertiesSet, getObject, isSingleton, setSingleton
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SetFactoryBean

public SetFactoryBean()
Method Detail

setSourceSet

public void setSourceSet(Set sourceSet)
Set the source Set, typically populated via XML "set" elements.


setTargetSetClass

public void setTargetSetClass(Class targetSetClass)
Set the class to use for the target Set. Can be populated with a fully qualified class name when defined in a Spring application context.

Default is a linked HashSet, keeping the registration order. If no linked Set implementation is available, a plain HashSet will be used as fallback (not keeping the registration order).

See Also:
CollectionFactory.createLinkedSetIfPossible(int)

getObjectType

public Class getObjectType()
Description copied from interface: FactoryBean
Return the type of object that this FactoryBean creates, or 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.

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)

createInstance

protected Object createInstance()
Description copied from class: AbstractFactoryBean
Template method that subclasses must override to construct the object returned by this factory.

Invoked on initialization of this FactoryBean in case of a singleton; else, on each getObject() call.

Specified by:
createInstance in class AbstractFactoryBean
Returns:
the object returned by this factory
See Also:
AbstractFactoryBean.getObject()


Copyright (c) 2002-2005 The Spring Framework Project.