org.springframework.beans.BeanWrapper#getPropertyDescriptor ( )源码实例Demo

@Override
public List getChildren(Object parent) {
	List<Object> children = new ArrayList<>();

	for (CrudRepository repo : repositories) {
		String parentProp = null;
		Iterable candidates = repo.findAll();
		for (Object candidate : candidates) {
			if (parentProp == null) {
				parentProp = CmisServiceBridge.findParentProperty(candidate);
			}
			if (parentProp != null) {
				BeanWrapper wrapper = new BeanWrapperImpl(candidate);
				PropertyDescriptor descriptor = wrapper.getPropertyDescriptor(parentProp);
				if (descriptor != null && descriptor.getReadMethod() != null) {
					Object actualParent = ReflectionUtils.invokeMethod(descriptor.getReadMethod(), candidate);
					if (Objects.equals(parent, actualParent)) {
						children.add(candidate);
					}
				}
			}
		}
	}

	return children;
}
 

/**
 * Abstract method defining "autowire by type" (bean properties by type) behavior.
 * <p>This is like PicoContainer default, in which there must be exactly one bean
 * of the property type in the bean factory. This makes bean factories simple to
 * configure for small namespaces, but doesn't work as well as standard Spring
 * behavior for bigger applications.
 * @param beanName the name of the bean to autowire by type
 * @param mbd the merged bean definition to update through autowiring
 * @param bw the BeanWrapper from which we can obtain information about the bean
 * @param pvs the PropertyValues to register wired objects with
 */
protected void autowireByType(
		String beanName, AbstractBeanDefinition mbd, BeanWrapper bw, MutablePropertyValues pvs) {

	TypeConverter converter = getCustomTypeConverter();
	if (converter == null) {
		converter = bw;
	}

	Set<String> autowiredBeanNames = new LinkedHashSet<>(4);
	String[] propertyNames = unsatisfiedNonSimpleProperties(mbd, bw);
	for (String propertyName : propertyNames) {
		try {
			PropertyDescriptor pd = bw.getPropertyDescriptor(propertyName);
			// Don't try autowiring by type for type Object: never makes sense,
			// even if it technically is a unsatisfied, non-simple property.
			if (Object.class != pd.getPropertyType()) {
				MethodParameter methodParam = BeanUtils.getWriteMethodParameter(pd);
				// Do not allow eager init for type matching in case of a prioritized post-processor.
				boolean eager = !PriorityOrdered.class.isInstance(bw.getWrappedInstance());
				DependencyDescriptor desc = new AutowireByTypeDependencyDescriptor(methodParam, eager);
				Object autowiredArgument = resolveDependency(desc, beanName, autowiredBeanNames, converter);
				if (autowiredArgument != null) {
					pvs.add(propertyName, autowiredArgument);
				}
				for (String autowiredBeanName : autowiredBeanNames) {
					registerDependentBean(autowiredBeanName, beanName);
					if (logger.isTraceEnabled()) {
						logger.trace("Autowiring by type from bean name '" + beanName + "' via property '" +
								propertyName + "' to bean named '" + autowiredBeanName + "'");
					}
				}
				autowiredBeanNames.clear();
			}
		}
		catch (BeansException ex) {
			throw new UnsatisfiedDependencyException(mbd.getResourceDescription(), beanName, propertyName, ex);
		}
	}
}
 

/**
 * Convert the given value for the specified target property.
 */
@Nullable
private Object convertForProperty(
		@Nullable Object value, String propertyName, BeanWrapper bw, TypeConverter converter) {

	if (converter instanceof BeanWrapperImpl) {
		return ((BeanWrapperImpl) converter).convertForProperty(value, propertyName);
	}
	else {
		PropertyDescriptor pd = bw.getPropertyDescriptor(propertyName);
		MethodParameter methodParam = BeanUtils.getWriteMethodParameter(pd);
		return converter.convertIfNecessary(value, pd.getPropertyType(), methodParam);
	}
}
 

/**
 * Abstract method defining "autowire by type" (bean properties by type) behavior.
 * <p>This is like PicoContainer default, in which there must be exactly one bean
 * of the property type in the bean factory. This makes bean factories simple to
 * configure for small namespaces, but doesn't work as well as standard Spring
 * behavior for bigger applications.
 * @param beanName the name of the bean to autowire by type
 * @param mbd the merged bean definition to update through autowiring
 * @param bw the BeanWrapper from which we can obtain information about the bean
 * @param pvs the PropertyValues to register wired objects with
 */
protected void autowireByType(
		String beanName, AbstractBeanDefinition mbd, BeanWrapper bw, MutablePropertyValues pvs) {

	TypeConverter converter = getCustomTypeConverter();
	if (converter == null) {
		converter = bw;
	}

	Set<String> autowiredBeanNames = new LinkedHashSet<>(4);
	String[] propertyNames = unsatisfiedNonSimpleProperties(mbd, bw);
	for (String propertyName : propertyNames) {
		try {
			PropertyDescriptor pd = bw.getPropertyDescriptor(propertyName);
			// Don't try autowiring by type for type Object: never makes sense,
			// even if it technically is a unsatisfied, non-simple property.
			if (Object.class != pd.getPropertyType()) {
				MethodParameter methodParam = BeanUtils.getWriteMethodParameter(pd);
				// Do not allow eager init for type matching in case of a prioritized post-processor.
				boolean eager = !PriorityOrdered.class.isInstance(bw.getWrappedInstance());
				DependencyDescriptor desc = new AutowireByTypeDependencyDescriptor(methodParam, eager);
				Object autowiredArgument = resolveDependency(desc, beanName, autowiredBeanNames, converter);
				if (autowiredArgument != null) {
					pvs.add(propertyName, autowiredArgument);
				}
				for (String autowiredBeanName : autowiredBeanNames) {
					registerDependentBean(autowiredBeanName, beanName);
					if (logger.isTraceEnabled()) {
						logger.trace("Autowiring by type from bean name '" + beanName + "' via property '" +
								propertyName + "' to bean named '" + autowiredBeanName + "'");
					}
				}
				autowiredBeanNames.clear();
			}
		}
		catch (BeansException ex) {
			throw new UnsatisfiedDependencyException(mbd.getResourceDescription(), beanName, propertyName, ex);
		}
	}
}
 

/**
 * Convert the given value for the specified target property.
 */
@Nullable
private Object convertForProperty(
		@Nullable Object value, String propertyName, BeanWrapper bw, TypeConverter converter) {

	if (converter instanceof BeanWrapperImpl) {
		return ((BeanWrapperImpl) converter).convertForProperty(value, propertyName);
	}
	else {
		PropertyDescriptor pd = bw.getPropertyDescriptor(propertyName);
		MethodParameter methodParam = BeanUtils.getWriteMethodParameter(pd);
		return converter.convertIfNecessary(value, pd.getPropertyType(), methodParam);
	}
}
 

/**
 * Abstract method defining "autowire by type" (bean properties by type) behavior.
 * <p>This is like PicoContainer default, in which there must be exactly one bean
 * of the property type in the bean factory. This makes bean factories simple to
 * configure for small namespaces, but doesn't work as well as standard Spring
 * behavior for bigger applications.
 * @param beanName the name of the bean to autowire by type
 * @param mbd the merged bean definition to update through autowiring
 * @param bw BeanWrapper from which we can obtain information about the bean
 * @param pvs the PropertyValues to register wired objects with
 */
protected void autowireByType(
		String beanName, AbstractBeanDefinition mbd, BeanWrapper bw, MutablePropertyValues pvs) {

	TypeConverter converter = getCustomTypeConverter();
	if (converter == null) {
		converter = bw;
	}

	Set<String> autowiredBeanNames = new LinkedHashSet<String>(4);
	String[] propertyNames = unsatisfiedNonSimpleProperties(mbd, bw);
	for (String propertyName : propertyNames) {
		try {
			PropertyDescriptor pd = bw.getPropertyDescriptor(propertyName);
			// Don't try autowiring by type for type Object: never makes sense,
			// even if it technically is a unsatisfied, non-simple property.
			if (Object.class != pd.getPropertyType()) {
				MethodParameter methodParam = BeanUtils.getWriteMethodParameter(pd);
				// Do not allow eager init for type matching in case of a prioritized post-processor.
				boolean eager = !PriorityOrdered.class.isAssignableFrom(bw.getWrappedClass());
				DependencyDescriptor desc = new AutowireByTypeDependencyDescriptor(methodParam, eager);
				Object autowiredArgument = resolveDependency(desc, beanName, autowiredBeanNames, converter);
				if (autowiredArgument != null) {
					pvs.add(propertyName, autowiredArgument);
				}
				for (String autowiredBeanName : autowiredBeanNames) {
					registerDependentBean(autowiredBeanName, beanName);
					if (logger.isDebugEnabled()) {
						logger.debug("Autowiring by type from bean name '" + beanName + "' via property '" +
								propertyName + "' to bean named '" + autowiredBeanName + "'");
					}
				}
				autowiredBeanNames.clear();
			}
		}
		catch (BeansException ex) {
			throw new UnsatisfiedDependencyException(mbd.getResourceDescription(), beanName, propertyName, ex);
		}
	}
}
 

/**
 * Convert the given value for the specified target property.
 */
private Object convertForProperty(Object value, String propertyName, BeanWrapper bw, TypeConverter converter) {
	if (converter instanceof BeanWrapperImpl) {
		return ((BeanWrapperImpl) converter).convertForProperty(value, propertyName);
	}
	else {
		PropertyDescriptor pd = bw.getPropertyDescriptor(propertyName);
		MethodParameter methodParam = BeanUtils.getWriteMethodParameter(pd);
		return converter.convertIfNecessary(value, pd.getPropertyType(), methodParam);
	}
}
 

/**
 * Abstract method defining "autowire by type" (bean properties by type) behavior.
 * <p>This is like PicoContainer default, in which there must be exactly one bean
 * of the property type in the bean factory. This makes bean factories simple to
 * configure for small namespaces, but doesn't work as well as standard Spring
 * behavior for bigger applications.
 * @param beanName the name of the bean to autowire by type
 * @param mbd the merged bean definition to update through autowiring
 * @param bw BeanWrapper from which we can obtain information about the bean
 * @param pvs the PropertyValues to register wired objects with
 */
protected void autowireByType(
		String beanName, AbstractBeanDefinition mbd, BeanWrapper bw, MutablePropertyValues pvs) {

	TypeConverter converter = getCustomTypeConverter();
	if (converter == null) {
		converter = bw;
	}

	Set<String> autowiredBeanNames = new LinkedHashSet<String>(4);
	String[] propertyNames = unsatisfiedNonSimpleProperties(mbd, bw);
	for (String propertyName : propertyNames) {
		try {
			PropertyDescriptor pd = bw.getPropertyDescriptor(propertyName);
			// Don't try autowiring by type for type Object: never makes sense,
			// even if it technically is a unsatisfied, non-simple property.
			if (!Object.class.equals(pd.getPropertyType())) {
				MethodParameter methodParam = BeanUtils.getWriteMethodParameter(pd);
				// Do not allow eager init for type matching in case of a prioritized post-processor.
				boolean eager = !PriorityOrdered.class.isAssignableFrom(bw.getWrappedClass());
				DependencyDescriptor desc = new AutowireByTypeDependencyDescriptor(methodParam, eager);
				Object autowiredArgument = resolveDependency(desc, beanName, autowiredBeanNames, converter);
				if (autowiredArgument != null) {
					pvs.add(propertyName, autowiredArgument);
				}
				for (String autowiredBeanName : autowiredBeanNames) {
					registerDependentBean(autowiredBeanName, beanName);
					if (logger.isDebugEnabled()) {
						logger.debug("Autowiring by type from bean name '" + beanName + "' via property '" +
								propertyName + "' to bean named '" + autowiredBeanName + "'");
					}
				}
				autowiredBeanNames.clear();
			}
		}
		catch (BeansException ex) {
			throw new UnsatisfiedDependencyException(mbd.getResourceDescription(), beanName, propertyName, ex);
		}
	}
}
 

/**
 * Convert the given value for the specified target property.
 */
private Object convertForProperty(Object value, String propertyName, BeanWrapper bw, TypeConverter converter) {
	if (converter instanceof BeanWrapperImpl) {
		return ((BeanWrapperImpl) converter).convertForProperty(value, propertyName);
	}
	else {
		PropertyDescriptor pd = bw.getPropertyDescriptor(propertyName);
		MethodParameter methodParam = BeanUtils.getWriteMethodParameter(pd);
		return converter.convertIfNecessary(value, pd.getPropertyType(), methodParam);
	}
}
 

/**
 * Abstract method defining "autowire by type" (bean properties by type) behavior.
 * <p>This is like PicoContainer default, in which there must be exactly one bean
 * of the property type in the bean factory. This makes bean factories simple to
 * configure for small namespaces, but doesn't work as well as standard Spring
 * behavior for bigger applications.
 * @param beanName the name of the bean to autowire by type
 * @param mbd the merged bean definition to update through autowiring
 * @param bw BeanWrapper from which we can obtain information about the bean
 * @param pvs the PropertyValues to register wired objects with
 */
protected void autowireByType(
		String beanName, AbstractBeanDefinition mbd, BeanWrapper bw, MutablePropertyValues pvs) {

	TypeConverter converter = getCustomTypeConverter();
	if (converter == null) {
		converter = bw;
	}

	Set<String> autowiredBeanNames = new LinkedHashSet<String>(4);
	String[] propertyNames = unsatisfiedNonSimpleProperties(mbd, bw);
	for (String propertyName : propertyNames) {
		try {
			PropertyDescriptor pd = bw.getPropertyDescriptor(propertyName);
			// Don't try autowiring by type for type Object: never makes sense,
			// even if it technically is a unsatisfied, non-simple property.
			if (Object.class != pd.getPropertyType()) {
				MethodParameter methodParam = BeanUtils.getWriteMethodParameter(pd);
				// Do not allow eager init for type matching in case of a prioritized post-processor.
				boolean eager = !PriorityOrdered.class.isAssignableFrom(bw.getWrappedClass());
				DependencyDescriptor desc = new AutowireByTypeDependencyDescriptor(methodParam, eager);
				Object autowiredArgument = resolveDependency(desc, beanName, autowiredBeanNames, converter);
				if (autowiredArgument != null) {
					pvs.add(propertyName, autowiredArgument);
				}
				for (String autowiredBeanName : autowiredBeanNames) {
					registerDependentBean(autowiredBeanName, beanName);
					if (logger.isDebugEnabled()) {
						logger.debug("Autowiring by type from bean name '" + beanName + "' via property '" +
								propertyName + "' to bean named '" + autowiredBeanName + "'");
					}
				}
				autowiredBeanNames.clear();
			}
		}
		catch (BeansException ex) {
			throw new UnsatisfiedDependencyException(mbd.getResourceDescription(), beanName, propertyName, ex);
		}
	}
}
 

/**
 * Convert the given value for the specified target property.
 */
private Object convertForProperty(Object value, String propertyName, BeanWrapper bw, TypeConverter converter) {
	if (converter instanceof BeanWrapperImpl) {
		return ((BeanWrapperImpl) converter).convertForProperty(value, propertyName);
	}
	else {
		PropertyDescriptor pd = bw.getPropertyDescriptor(propertyName);
		MethodParameter methodParam = BeanUtils.getWriteMethodParameter(pd);
		return converter.convertIfNecessary(value, pd.getPropertyType(), methodParam);
	}
}
 

private static List<String> getDiscardedProperties(Object source, Object converted) {
    final String cacheKey = source.getClass().getName() + " to " + converted.getClass().getName();
    if (discardedPropertiesCache.containsKey(cacheKey)) {
        return discardedPropertiesCache.get(cacheKey);
    }

    final List<String> discardedProperties = new LinkedList<>();
    final BeanWrapper sourceBean = new BeanWrapperImpl(source);
    final BeanWrapper targetBean = new BeanWrapperImpl(converted);
    final PropertyDescriptor[] sourceProperties = sourceBean.getPropertyDescriptors();
    for (PropertyDescriptor sourceProperty : sourceProperties) {
        if (targetBean.isWritableProperty(sourceProperty.getName())) {
            final PropertyDescriptor targetProperty = targetBean.getPropertyDescriptor(sourceProperty.getName());
            final Class<?> sourcePropertyType = sourceProperty.getPropertyType();
            final Class<?> targetPropertyType = targetProperty.getPropertyType();
            final Method readMethod = sourceProperty.getReadMethod();
            if (readMethod != null) {
                final Type sourceReturnType = readMethod.getGenericReturnType();
                final Method targetPropertyWriteMethod = targetProperty.getWriteMethod();
                if (targetPropertyWriteMethod != null) {
                    final Type targetReturnType =
                            targetPropertyWriteMethod.getParameters()[0].getParameterizedType();
                    boolean valid =
                            Object.class.equals(targetPropertyType) || sourcePropertyType.equals(targetPropertyType)
                                    && sourceReturnType.equals(targetReturnType);
                    if (!valid) {
                        discardedProperties.add(sourceProperty.getName());
                    }
                }
            } else {
                discardedProperties.add(sourceProperty.getName());
            }
        }
    }
    discardedPropertiesCache.put(cacheKey, unmodifiableList(discardedProperties));

    return discardedProperties;
}