public  void afterPropertiesSet() throws Exception 
{
		if (isSingleton()) {
			this.initialized = true;
			this.singletonInstance = createInstance();
			this.earlySingletonInstance = null;
		}
}

Eagerly create the singleton instance, if necessary.

 abstract protected Object createInstance() throws Exception
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.

 public  void destroy() throws Exception 
{
		if (isSingleton()) {
			destroyInstance(this.singletonInstance);
		}
}

Destroy the singleton instance, if any.

 protected  void destroyInstance(Object instance) throws Exception 
{

}

Callback for destroying a singleton instance. Subclasses may override this to destroy the previously created instance.

The default implementation is empty.

 protected BeanFactory getBeanFactory() 
{
		return this.beanFactory;
}

Return the BeanFactory that this bean runs in.

 protected TypeConverter getBeanTypeConverter() 
{
		BeanFactory beanFactory = getBeanFactory();
		if (beanFactory instanceof ConfigurableBeanFactory) {
			return ((ConfigurableBeanFactory) beanFactory).getTypeConverter();
		}
		else {
			return new SimpleTypeConverter();
		}
}

Obtain a bean type converter from the BeanFactory that this bean runs in. This is typically a fresh instance for each call, since TypeConverters are usually not thread-safe.

Falls back to a SimpleTypeConverter when not running in a BeanFactory.

 protected Class[] getEarlySingletonInterfaces() 
{
		Class type = getObjectType();
		return (type != null && type.isInterface() ? new Class[] {type} : null);
}

Return an array of interfaces that a singleton object exposed by this FactoryBean is supposed to implement, for use with an 'early singleton proxy' that will be exposed in case of a circular reference.

The default implementation returns this FactoryBean's object type, provided that it is an interface, or null else. The latter indicates that early singleton access is not supported by this FactoryBean. This will lead to a FactoryBeanNotInitializedException getting thrown.

 public final Object getObject() throws Exception 
{
		if (isSingleton()) {
			return (this.initialized ? this.singletonInstance : getEarlySingletonInstance());
		}
		else {
			return createInstance();
		}
}

Expose the singleton instance or create a new prototype instance.

 abstract public Class getObjectType()
This abstract method declaration mirrors the method in the FactoryBean
interface, for a consistent offering of abstract template methods.

 public boolean isSingleton() 
{
		return this.singleton;
}

 public  void setBeanClassLoader(ClassLoader classLoader) 
{
		this.beanClassLoader = classLoader;
}

 public  void setBeanFactory(BeanFactory beanFactory) 
{
		this.beanFactory = beanFactory;
}

 public  void setSingleton(boolean singleton) 
{
	                     	 
		this.singleton = singleton;
}

Set if a singleton should be created, or a new object on each request else. Default is true (a singleton).