Spring源码-applyPropertyValues

applyPropertyValues

  protected void applyPropertyValues(String beanName, BeanDefinition mbd, BeanWrapper bw, PropertyValues pvs) {
	if (pvs.isEmpty()) {
		return;
	}

	if (System.getSecurityManager() != null && bw instanceof BeanWrapperImpl) {
		((BeanWrapperImpl) bw).setSecurityContext(getAccessControlContext());
	}

	MutablePropertyValues mpvs = null;
	List<PropertyValue> original;

	if (pvs instanceof MutablePropertyValues) {
		mpvs = (MutablePropertyValues) pvs;
		if (mpvs.isConverted()) {
			// Shortcut: use the pre-converted values as-is.
			try {
				bw.setPropertyValues(mpvs);
				return;
			}
			catch (BeansException ex) {
				throw new BeanCreationException(
						mbd.getResourceDescription(), beanName, "Error setting property values", ex);
			}
		}
		original = mpvs.getPropertyValueList();
	}
	else {
		original = Arrays.asList(pvs.getPropertyValues());
	}

	TypeConverter converter = getCustomTypeConverter();
	if (converter == null) {
		converter = bw;
	}
	BeanDefinitionValueResolver valueResolver = new BeanDefinitionValueResolver(this, beanName, mbd, converter);

	// Create a deep copy, resolving any references for values.
	List<PropertyValue> deepCopy = new ArrayList<>(original.size());
	boolean resolveNecessary = false;
	for (PropertyValue pv : original) {
		if (pv.isConverted()) {
			deepCopy.add(pv);
		}
		else {
			String propertyName = pv.getName();
			Object originalValue = pv.getValue();
			if (originalValue == AutowiredPropertyMarker.INSTANCE) {
				Method writeMethod = bw.getPropertyDescriptor(propertyName).getWriteMethod();
				if (writeMethod == null) {
					throw new IllegalArgumentException("Autowire marker for property without write method: " + pv);
				}
				originalValue = new DependencyDescriptor(new MethodParameter(writeMethod, 0), true);
			}
			Object resolvedValue = valueResolver.resolveValueIfNecessary(pv, originalValue);
			Object convertedValue = resolvedValue;
			boolean convertible = bw.isWritableProperty(propertyName) &&
					!PropertyAccessorUtils.isNestedOrIndexedProperty(propertyName);
			if (convertible) {
				convertedValue = convertForProperty(resolvedValue, propertyName, bw, converter);
			}
			// Possibly store converted value in merged bean definition,
			// in order to avoid re-conversion for every created bean instance.
			if (resolvedValue == originalValue) {
				if (convertible) {
					pv.setConvertedValue(convertedValue);
				}
				deepCopy.add(pv);
			}
			else if (convertible && originalValue instanceof TypedStringValue &&
					!((TypedStringValue) originalValue).isDynamic() &&
					!(convertedValue instanceof Collection || ObjectUtils.isArray(convertedValue))) {
				pv.setConvertedValue(convertedValue);
				deepCopy.add(pv);
			}
			else {
				resolveNecessary = true;
				deepCopy.add(new PropertyValue(pv, convertedValue));
			}
		}
	}
	if (mpvs != null && !resolveNecessary) {
		mpvs.setConverted();
	}

	// Set our (possibly massaged) deep copy.
	try {
		bw.setPropertyValues(new MutablePropertyValues(deepCopy));
	}
	catch (BeansException ex) {
		throw new BeanCreationException(
				mbd.getResourceDescription(), beanName, "Error setting property values", ex);
	}
}

applyPropertyValues将属性应用到bean对象。遍历所有属性并解析加到深拷贝列表，解析完所有属性后应用到bean。为了不影响到BeanDefinition的属性集合才使用深拷贝。由BeanDefinitionValueResolver的resolveValueIfNecessary方法解析属性值并作适当类型转换。