abstractbeanfactory.java

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			this.customEditors.putAll(otherAbstractFactory.customEditors);
			this.propertyEditorRegistrars.addAll(otherAbstractFactory.propertyEditorRegistrars);
			this.beanPostProcessors.addAll(otherAbstractFactory.beanPostProcessors);
			this.hasInstantiationAwareBeanPostProcessors = this.hasInstantiationAwareBeanPostProcessors ||
					otherAbstractFactory.hasInstantiationAwareBeanPostProcessors;
			this.hasDestructionAwareBeanPostProcessors = this.hasDestructionAwareBeanPostProcessors ||
					otherAbstractFactory.hasDestructionAwareBeanPostProcessors;
			this.scopes.putAll(otherAbstractFactory.scopes);
		}
	}

	/**
	 * Return a 'merged' BeanDefinition for the given bean name,
	 * merging a child bean definition with its parent if necessary.
	 * <p>This <code>getMergedBeanDefinition</code> considers bean definition
	 * in ancestors as well.
	 * @param name the name of the bean to retrieve the merged definition for
	 * (may be an alias)
	 * @return a (potentially merged) RootBeanDefinition for the given bean
	 * @throws NoSuchBeanDefinitionException if there is no bean with the given name
	 * @throws BeanDefinitionStoreException in case of an invalid bean definition
	 */
	public BeanDefinition getMergedBeanDefinition(String name) throws BeansException {
		String beanName = transformedBeanName(name);

		// Efficiently check whether bean definition exists in this factory.
		if (!containsBeanDefinition(beanName) && getParentBeanFactory() instanceof ConfigurableBeanFactory) {
			return ((ConfigurableBeanFactory) getParentBeanFactory()).getMergedBeanDefinition(beanName);
		}
		// Resolve merged bean definition locally.
		return getMergedLocalBeanDefinition(beanName);
	}

	public boolean isFactoryBean(String name) throws NoSuchBeanDefinitionException {
		String beanName = transformedBeanName(name);

		Object beanInstance = getSingleton(beanName, false);
		if (beanInstance != null) {
			return (beanInstance instanceof FactoryBean);
		}

		// No singleton instance found -> check bean definition.
		if (!containsBeanDefinition(beanName) && getParentBeanFactory() instanceof ConfigurableBeanFactory) {
			// No bean definition found in this factory -> delegate to parent.
			return ((ConfigurableBeanFactory) getParentBeanFactory()).isFactoryBean(name);
		}

		return isFactoryBean(beanName, getMergedLocalBeanDefinition(beanName));
	}

	/**
	 * Callback before prototype creation.
	 * <p>The default implementation register the prototype as currently in creation.
	 * @param beanName the name of the prototype about to be created
	 * @see #isPrototypeCurrentlyInCreation
	 */
	protected void beforePrototypeCreation(String beanName) {
		Object curVal = this.prototypesCurrentlyInCreation.get();
		if (curVal == null) {
			this.prototypesCurrentlyInCreation.set(beanName);
		}
		else if (curVal instanceof String) {
			Set beanNameSet = new HashSet(2);
			beanNameSet.add(curVal);
			beanNameSet.add(beanName);
			this.prototypesCurrentlyInCreation.set(beanNameSet);
		}
		else {
			Set beanNameSet = (Set) curVal;
			beanNameSet.add(beanName);
		}
	}

	/**
	 * Callback after prototype creation.
	 * <p>The default implementation marks the prototype as not in creation anymore.
	 * @param beanName the name of the prototype that has been created
	 * @see #isPrototypeCurrentlyInCreation
	 */
	protected void afterPrototypeCreation(String beanName) {
		Object curVal = this.prototypesCurrentlyInCreation.get();
		if (curVal instanceof String) {
			this.prototypesCurrentlyInCreation.set(null);
		}
		else if (curVal instanceof Set) {
			Set beanNameSet = (Set) curVal;
			beanNameSet.remove(beanName);
			if (beanNameSet.isEmpty()) {
				this.prototypesCurrentlyInCreation.set(null);
			}
		}
	}

	/**
	 * Return whether the specified prototype bean is currently in creation
	 * (within the current thread).
	 * @param beanName the name of the bean
	 */
	protected final boolean isPrototypeCurrentlyInCreation(String beanName) {
		Object curVal = this.prototypesCurrentlyInCreation.get();
		return (curVal != null &&
				(curVal.equals(beanName) || (curVal instanceof Set && ((Set) curVal).contains(beanName))));
	}

	public boolean isCurrentlyInCreation(String beanName) {
		return isSingletonCurrentlyInCreation(beanName) || isPrototypeCurrentlyInCreation(beanName);
	}

	public void destroyBean(String beanName, Object beanInstance) {
		destroyBean(beanName, beanInstance, getMergedLocalBeanDefinition(beanName));
	}

	/**
	 * Destroy the given bean instance (usually a prototype instance
	 * obtained from this factory) according to the given bean definition.
	 * @param beanName the name of the bean definition
	 * @param beanInstance the bean instance to destroy
	 * @param mbd the merged bean definition
	 */
	protected void destroyBean(String beanName, Object beanInstance, RootBeanDefinition mbd) {
		new DisposableBeanAdapter(beanInstance, beanName, mbd, getBeanPostProcessors()).destroy();
	}

	public void destroyScopedBean(String beanName) {
		RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);
		if (mbd.isSingleton() || mbd.isPrototype()) {
			throw new IllegalArgumentException(
					"Bean name '" + beanName + "' does not correspond to an object in a Scope");
		}
		String scopeName = mbd.getScope();
		Scope scope = (Scope) this.scopes.get(scopeName);
		if (scope == null) {
			throw new IllegalStateException("No Scope registered for scope '" + scopeName + "'");
		}
		Object bean = scope.remove(beanName);
		if (bean != null) {
			destroyBean(beanName, bean, mbd);
		}
	}


	//---------------------------------------------------------------------
	// Implementation methods
	//---------------------------------------------------------------------

	/**
	 * Return the bean name, stripping out the factory dereference prefix if necessary,
	 * and resolving aliases to canonical names.
	 * @param name the user-specified name
	 * @return the transformed bean name
	 */
	protected String transformedBeanName(String name) {
		return canonicalName(BeanFactoryUtils.transformedBeanName(name));
	}

	/**
	 * Determine the original bean name, resolving locally defined aliases to canonical names.
	 * @param name the user-specified name
	 * @return the original bean name
	 */
	protected String originalBeanName(String name) {
		String beanName = transformedBeanName(name);
		if (name.startsWith(FACTORY_BEAN_PREFIX)) {
			beanName = FACTORY_BEAN_PREFIX + beanName;
		}
		return beanName;
	}

	/**
	 * Initialize the given BeanWrapper with the custom editors registered
	 * with this factory. To be called for BeanWrappers that will create
	 * and populate bean instances.
	 * <p>The default implementation delegates to <code>registerCustomEditors</code>.
	 * Can be overridden in subclasses.
	 * @param bw the BeanWrapper to initialize
	 * @see #registerCustomEditors
	 */
	protected void initBeanWrapper(BeanWrapper bw) {
		registerCustomEditors(bw);
	}

	/**
	 * Initialize the given PropertyEditorRegistry with the custom editors
	 * registered with this BeanFactory.
	 * <p>To be called for BeanWrappers that will create and populate bean
	 * instances, and for SimpleTypeConverter used for constructor argument
	 * and factory method type conversion.
	 * @param registry the PropertyEditorRegistry to initialize
	 */
	protected void registerCustomEditors(PropertyEditorRegistry registry) {
		PropertyEditorRegistrySupport registrySupport =
				(registry instanceof PropertyEditorRegistrySupport ? (PropertyEditorRegistrySupport) registry : null);
		if (registrySupport != null) {
			registrySupport.useConfigValueEditors();
		}
		if (!this.propertyEditorRegistrars.isEmpty()) {
			for (Iterator it = this.propertyEditorRegistrars.iterator(); it.hasNext();) {
				PropertyEditorRegistrar registrar = (PropertyEditorRegistrar) it.next();
				try {
					registrar.registerCustomEditors(registry);
				}
				catch (BeanCreationException ex) {
					Throwable rootCause = ex.getMostSpecificCause();
					if (rootCause instanceof BeanCurrentlyInCreationException) {
						BeanCreationException bce = (BeanCreationException) rootCause;
						if (isCurrentlyInCreation(bce.getBeanName())) {
							if (logger.isDebugEnabled()) {
								logger.debug("PropertyEditorRegistrar [" + registrar.getClass().getName() +
										"] failed because it tried to obtain currently created bean '" + ex.getBeanName() +
										"': " + ex.getMessage());
							}
							onSuppressedException(ex);
							continue;
						}
					}
					throw ex;
				}
			}
		}
		if (!this.customEditors.isEmpty()) {
			for (Iterator it = this.customEditors.entrySet().iterator(); it.hasNext();) {
				Map.Entry entry = (Map.Entry) it.next();
				Class requiredType = (Class) entry.getKey();
				Object value = entry.getValue();
				if (value instanceof PropertyEditor) {
					PropertyEditor editor = (PropertyEditor) value;
					// Register the editor as shared instance, if possible,
					// to make it clear that it might be used concurrently.
					if (registrySupport != null) {
						registrySupport.registerSharedEditor(requiredType, editor);
					}
					else {
						registry.registerCustomEditor(requiredType, editor);
					}
				}
				else if (value instanceof Class) {
					Class editorClass = (Class) value;
					registry.registerCustomEditor(requiredType, (PropertyEditor) BeanUtils.instantiateClass(editorClass));
				}
				else {
					throw new IllegalStateException("Illegal custom editor value type: " + value.getClass().getName());
				}
			}
		}
	}


	/**
	 * Return a merged RootBeanDefinition, traversing the parent bean definition
	 * if the specified bean corresponds to a child bean definition.
	 * @param beanName the name of the bean to retrieve the merged definition for
	 * @return a (potentially merged) RootBeanDefinition for the given bean
	 * @throws NoSuchBeanDefinitionException if there is no bean with the given name
	 * @throws BeanDefinitionStoreException in case of an invalid bean definition
	 */
	protected RootBeanDefinition getMergedLocalBeanDefinition(String beanName) throws BeansException {
		// Quick check on the concurrent map first, with minimal locking.
		RootBeanDefinition mbd = (RootBeanDefinition) this.mergedBeanDefinitions.get(beanName);
		if (mbd != null) {
			return mbd;
		}
		return getMergedBeanDefinition(beanName, getBeanDefinition(beanName));
	}

	/**
	 * Return a RootBeanDefinition for the given top-level bean, by merging with
	 * the parent if the given bean's definition is a child bean definition.
	 * @param beanName the name of the bean definition
	 * @param bd the original bean definition (Root/ChildBeanDefinition)
	 * @return a (potentially merged) RootBeanDefinition for the given bean
	 * @throws BeanDefinitionStoreException in case of an invalid bean definition
	 */
	protected RootBeanDefinition getMergedBeanDefinition(String beanName, BeanDefinition bd)
			throws BeanDefinitionStoreException {

		return getMergedBeanDefinition(beanName, bd, null);
	}

	/**
	 * Return a RootBeanDefinition for the given bean, by merging with the
	 * parent if the given bean's definition is a child bean definition.
	 * @param beanName the name of the bean definition
	 * @param bd the original bean definition (Root/ChildBeanDefinition)
	 * @param containingBd the containing bean definition in case of inner bean,
	 * or <code>null</code> in case of a top-level bean
	 * @return a (potentially merged) RootBeanDefinition for the given bean
	 * @throws BeanDefinitionStoreException in case of an invalid bean definition
	 */
	protected RootBeanDefinition getMergedBeanDefinition(
			String beanName, BeanDefinition bd, BeanDefinition containingBd)
			throws BeanDefinitionStoreException {

		synchronized (this.mergedBeanDefinitions) {
			RootBeanDefinition mbd = null;

			// Check with full lock now in order to enforce the same merged instance.
			if (containingBd == null) {
				mbd = (RootBeanDefinition) this.mergedBeanDefinitions.get(beanName);
			}

			if (mbd == null) {
				if (bd.getParentName() == null) {
					// Use copy of given root bean definition.
					mbd = new RootBeanDefinition(bd);
				}
				else {
					// Child bean definition: needs to be merged with parent.
					BeanDefinition pbd = null;
					try {
						String parentBeanName = transformedBeanName(bd.getParentName());
						if (!beanName.equals(parentBeanName)) {
							pbd = getMergedBeanDefinition(parentBeanName);
						}
						else {
							if (getParentBeanFactory() instanceof ConfigurableBeanFactory) {
								pbd = ((ConfigurableBeanFactory) getParentBeanFactory()).getMergedBeanDefinition(parentBeanName);
							}
							else {
								throw new NoSuchBeanDefinitionException(bd.getParentName(),
										"Parent name '" + bd.getParentName() + "' is equal to bean name '" + beanName +
										"': cannot be resolved without an AbstractBeanFactory parent");
							}
						}
					}
					catch (NoSuchBeanDefinitionException ex) {
						throw new BeanDefinitionStoreException(bd.getResourceDescription(), beanName,
								"Could not resolve parent bean definition '" + bd.getParentName() + "'", ex);
					}
					// Deep copy with overridden values.
					mbd = new RootBeanDefinition(pbd);
					mbd.overrideFrom(bd);
				}

				// A bean contained in a non-singleton bean cannot be a singleton itself.
				// Let's correct this on the fly here, since this might be the result of
				// parent-child merging for the outer bean, in which case the original inner bean
				// definition will not have inherited the merged outer bean's singleton status.
				if (containingBd != null && !containingBd.isSingleton() && mbd.isSingleton()) {
					mbd.setScope(containingBd.getScope());
				}

				// Only cache the merged bean definition if we're already about to create an
				// instance of the bean, or at least have already created an instance before.
				if (containingBd == null && isCacheBeanMetadata() && isBeanEligibleForMetadataCaching(beanName)) {
					this.mergedBeanDefinitions.put(beanName, mbd);
				}
			}

			return mbd;
		}
	}

	/**