javax.validation.TraversableResolver#javax.validation.Path.Node源码实例Demo

private static Object getValue(final Node propertyNode) {
	// bean validation not sufficient for sets
	// not possible to access elements, reverting to
	// Hibernate implementation
	// TODO investigate other implementation next to
	// hibernate, JSR 303 v1.1 not sufficient

	checkNodeImpl(propertyNode);

	return ExceptionUtil.wrapCatchedExceptions(new Callable<Object>() {

		@Override
		public Object call() throws Exception {
			Method parentMethod = propertyNode.getClass().getMethod("getParent");
			Method valueMethod = propertyNode.getClass().getMethod("getValue");
			Object parentNode = parentMethod.invoke(propertyNode);
			if (parentNode != null) {
				return valueMethod.invoke(parentNode);
			} else {
				return valueMethod.invoke(propertyNode);
			}
		}
	});
}
 

private static Object getParameterValue(final Node propertyNode) {
	// bean validation not sufficient for sets
	// not possible to access elements, reverting to
	// Hibernate implementation
	// TODO investigate other implementation next to
	// hibernate, JSR 303 v1.1 not sufficient
	checkNodeImpl(propertyNode);

	return ExceptionUtil.wrapCatchedExceptions(new Callable<Object>() {

		@Override
		public Object call() throws Exception {
			Method valueMethod = propertyNode.getClass().getMethod("getValue");
			return valueMethod.invoke(propertyNode);
		}
	});
}
 

private String makePath ( final ConstraintViolation<Object> entry )
{
    final StringBuilder sb = new StringBuilder ();

    final Path p = entry.getPropertyPath ();
    for ( final Node n : p )
    {
        if ( sb.length () > 0 )
        {
            sb.append ( '.' );
        }
        sb.append ( n.getName () );
    }

    return sb.toString ();
}
 

@Override
public ValidationErrorMessage createBody(ConstraintViolationException ex, HttpServletRequest req) {

    ErrorMessage tmpl = super.createBody(ex, req);
    ValidationErrorMessage msg = new ValidationErrorMessage(tmpl);

    for (ConstraintViolation<?> violation : ex.getConstraintViolations()) {
        Node pathNode = findLastNonEmptyPathNode(violation.getPropertyPath());

        // path is probably useful only for properties (fields)
        if (pathNode != null && pathNode.getKind() == ElementKind.PROPERTY) {
            msg.addError(pathNode.getName(), convertToString(violation.getInvalidValue()), violation.getMessage());

        // type level constraints etc.
        } else {
            msg.addError(violation.getMessage());
        }
    }
    return msg;
}
 

/**
 * Take a stab at fixing validation problems ?
 * 
 * @param object
 */
private void validate(Object object) {
	Set<ConstraintViolation<Object>> viols = validator.validate(object);
	for (ConstraintViolation<Object> constraintViolation : viols) {
		if (Null.class.isAssignableFrom(constraintViolation.getConstraintDescriptor().getAnnotation().getClass())) {
			Object o = constraintViolation.getLeafBean();
			Iterator<Node> iterator = constraintViolation.getPropertyPath().iterator();
			String propertyName = null;
			while (iterator.hasNext()) {
				propertyName = iterator.next().getName();
			}
			if (propertyName != null) {
				try {
					PropertyDescriptor descriptor = BeanUtils.getPropertyDescriptor(o.getClass(), propertyName);
					descriptor.getWriteMethod().invoke(o, new Object[] { null });
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		}
	}
}
 

List<NamedNode<?>> build(ConstraintViolation<Object> violation) {
    Iterator<Node> violationNodes = violation.getPropertyPath().iterator();

    return asList(
            methodNode(violationNodes.next()),
            requestedArgument(violationNodes.next()));
    // we could try to locate all other request nodes from the violation path, too
}
 

private Argument requestedArgument(Node node) {
    String graphQLArgumentName = dfe.getFieldDefinition().getArguments().get(parameterIndex(node.getName()))
            .getName();

    Field requestedField = dfe.getMergedField().getSingleField();

    return requestedField.getArguments().stream()
            .filter(argument -> argument.getName().equals(graphQLArgumentName))
            .findFirst()
            .orElseThrow(() -> new AssertionError(
                    "expected field " + graphQLArgumentName + " in " + requestedField.getArguments()));
}
 

@Override
public ConstraintType.Type getConstraintType(Object o) {
    if (!(o instanceof ConstraintViolation)) {
        throw new RuntimeException(Messages.MESSAGES.unknownObjectPassedAsConstraintViolation(o));
    }
    ConstraintViolation<?> v = ConstraintViolation.class.cast(o);

    Iterator<Node> nodes = v.getPropertyPath().iterator();
    Node firstNode = nodes.next();

    switch (firstNode.getKind()) {
        case BEAN:
            return ConstraintType.Type.CLASS;
        case CONSTRUCTOR:
        case METHOD:
            Node secondNode = nodes.next();

            if (secondNode.getKind() == ElementKind.PARAMETER || secondNode.getKind() == ElementKind.CROSS_PARAMETER) {
                return ConstraintType.Type.PARAMETER;
            } else if (secondNode.getKind() == ElementKind.RETURN_VALUE) {
                return ConstraintType.Type.RETURN_VALUE;
            } else {
                throw new RuntimeException(Messages.MESSAGES.unexpectedPathNodeViolation(secondNode.getKind()));
            }
        case PROPERTY:
            return ConstraintType.Type.PROPERTY;
        case CROSS_PARAMETER:
        case PARAMETER:
        case RETURN_VALUE:
        case CONTAINER_ELEMENT: // we shouldn't encounter these element types at the root
        default:
            throw new RuntimeException(Messages.MESSAGES.unexpectedPathNode(firstNode.getKind()));
    }
}
 

private static void checkNodeImpl(Node propertyNode) {
	boolean hibernateNodeImpl =
			propertyNode.getClass().getName().equals(HIBERNATE_PROPERTY_NODE_IMPL); // NOSONAR class / may not be available
	boolean hiberanteNodeImpl2 = propertyNode.getClass().getName().equals(HIBERNATE_PROPERTY_NODE_ENGINE_IMPL); // NOSONAR;

	PreconditionUtil.assertTrue("cannot convert violations for java.util.Set elements, consider using Hibernate validator",
			hibernateNodeImpl || hiberanteNodeImpl2);
}
 

/**
 * Translate validated bean and root path into validated resource and
 * resource path. For example, embeddables belonging to an entity document
 * are mapped back to an entity violation and a proper path to the
 * embeddable attribute.
 *
 * @param violation to compute the reference
 * @return computaed reference
 */
private ResourceRef resolvePath(ConstraintViolation<?> violation) {
	Object resource = violation.getRootBean();

	Object nodeObject = resource;
	ResourceRef ref = new ResourceRef(resource);

	Iterator<Node> iterator = violation.getPropertyPath().iterator();
	while (iterator.hasNext()) {
		Node node = iterator.next();

		// ignore methods/parameters
		if (node.getKind() == ElementKind.METHOD) {
			continue;
		}
		if (node.getKind() == ElementKind.PARAMETER) {
			resource = getParameterValue(node);
			nodeObject = resource;
			ref = new ResourceRef(resource);
			assertResource(resource);
			continue;
		}

		// visit list, set, map references
		nodeObject = ref.getNodeReference(nodeObject, node);
		ref.visitNode(nodeObject);

		// visit property
		nodeObject = ref.visitProperty(nodeObject, node);
	}

	return ref;
}
 

private Object getNodeReference(Object element, Node node) {
	Integer index = node.getIndex();
	Object key = node.getKey();
	if (index != null) {
		appendSeparator();
		appendSourcePointer(index);
		return ((List<?>) element).get(index);
	} else if (key != null) {
		appendSeparator();
		appendSourcePointer(key);
		return ((Map<?, ?>) element).get(key);
	} else if (element instanceof Set && getValue(node) != null) {
		Object elementEntry = getValue(node);

		// since sets get translated to arrays, we do the same here
		// crnk-client allocates sets that preserver the order
		// of arrays
		List<Object> list = new ArrayList<>();
		list.addAll((Set<?>) element);
		index = list.indexOf(elementEntry);

		appendSeparator();
		appendSourcePointer(index);

		return getValue(node);
	}
	return element;
}
 

@Override
public String toString() {
	Iterator<Node> iterator = iterator();
	StringBuilder builder = new StringBuilder();
	while (iterator.hasNext()) {
		Node node = iterator.next();
		String name = node.getName();
		if (name != null && builder.length() > 0) {
			builder.append(".");
		}
		builder.append(node);
	}
	return builder.toString();
}
 

public ValidationResponse(final ConstraintViolationException cause) {
  super(false, new ArrayList<>());
  //noinspection ThrowableResultOfMethodCallIgnored
  checkNotNull(cause);
  Set<ConstraintViolation<?>> violations = cause.getConstraintViolations();
  if (violations != null && !violations.isEmpty()) {
    for (ConstraintViolation<?> violation : violations) {
      List<String> entries = new ArrayList<>();
      // iterate path to get the full path
      Iterator<Node> it = violation.getPropertyPath().iterator();
      while (it.hasNext()) {
        Node node = it.next();
        if (ElementKind.PROPERTY == node.getKind() || (ElementKind.PARAMETER == node.getKind() && !it.hasNext())) {
          if (node.getKey() != null) {
            entries.add(node.getKey().toString());
          }
          entries.add(node.getName());
        }
      }
      if (entries.isEmpty()) {
        if (messages == null) {
          messages = new ArrayList<>();
        }
        messages.add(violation.getMessage());
      }
      else {
        if (errors == null) {
          errors = new HashMap<>();
        }
        errors.put(Joiner.on('.').join(entries), violation.getMessage());
      }
    }
  }
  else if (cause.getMessage() != null) {
    messages = new ArrayList<>();
    messages.add(cause.getMessage());
  }
}
 

/**
 * return {@code true}
 */
public boolean isCascadable(final Object traversableObject,
                            final Node traversableProperty,
                            final Class<?> rootBeanType,
                            final Path pathToTraversableObject,
                            final ElementType elementType)
{
  return true;
}
 

/**
 * return {@code true}
 */
public boolean isReachable(final Object traversableObject,
                           final Node traversableProperty,
                           final Class<?> rootBeanType,
                           final Path pathToTraversableObject,
                           final ElementType elementType)
{
  return true;
}
 

private Node findLastNonEmptyPathNode(Path path) {

        List<Node> list = new ArrayList<>();
        for (Iterator<Node> it = path.iterator(); it.hasNext(); ) {
            list.add(it.next());
        }
        Collections.reverse(list);
        for (Node node : list) {
            if (!isEmpty(node.getName())) {
                return node;
            }
        }
        return null;
    }
 

@Override
protected String extractCategory(ValuedParameter[] params, ConstraintViolation<Object> violation) {
	Iterator<Node> node = violation.getPropertyPath().iterator();
	int index =  getFirstParameterIndex( node );  
	node = violation.getPropertyPath().iterator();// Reset the interator
	StringBuilder joinedCategoryBuilder = new StringBuilder( mountCategory( node ).replace( "arg" + index , params[index].getName() ) );
	return appendPropertyNameIfDefined( joinedCategoryBuilder , violation ) ;
}
 

@Test
public void shouldUseCustomValueExtractoe() {
	Customer bean = new Customer();
	bean.emailsByType.put( "work", "[email protected]" );
	bean.emailsByType.put( "work", "not-an-email" );

	Validator validator = Validation.buildDefaultValidatorFactory().getValidator();

	Set<ConstraintViolation<Customer>> violations = validator.validate (bean );
	assertEquals( 1, violations.size() );

	ConstraintViolation<Customer> violation = violations.iterator().next();
	assertEquals( "not-an-email", violation.getInvalidValue() );
	assertEquals( Email.class, violation.getConstraintDescriptor().getAnnotation().annotationType() );

	Iterator<Node> pathNodes = violation.getPropertyPath().iterator();
	assertTrue( pathNodes.hasNext() );

	Node node = pathNodes.next();
	assertEquals( "emailsByType", node.getName() );
	assertEquals( ElementKind.PROPERTY, node.getKind() );

	assertTrue( pathNodes.hasNext() );
	node = pathNodes.next();
	assertEquals( "<multimap value>", node.getName() );
	assertEquals( ElementKind.CONTAINER_ELEMENT, node.getKind() );
	assertEquals( "work", node.getKey() );

	assertFalse( pathNodes.hasNext() );
}
 

/**
 * Returns the category for this constraint violation. By default, the category returned
 * is the full path for property. You can override this method if you prefer another strategy.
 */
protected String extractCategory(ValuedParameter[] params, ConstraintViolation<Object> violation) {
	Iterator<Node> path = violation.getPropertyPath().iterator();
	Node method = path.next();
	logger.debug("Constraint violation on method {}: {}", method, violation);

	StringBuilder cat = new StringBuilder();
	cat.append(params[path.next().as(ParameterNode.class).getParameterIndex()].getName());// parameter name

	while (path.hasNext()) {
		cat.append(".").append(path.next());
	}

	return cat.toString();
}
 

private Stream<String> items(Node node) {
    if (node.getIndex() == null)
        return Stream.of(node.getName());
    return Stream.of(node.getIndex().toString(), node.getName());
}
 

/**
 * 获取错误信息源
 * @author Frodez
 * @date 2019-06-11
 */
private static String getErrorSource(ConstraintViolation<Object> violation) {
	Stream<Node> stream = StreamSupport.stream(violation.getPropertyPath().spliterator(), false);
	List<String> nodes = stream.filter(isErrorSouce).map(Path.Node::toString).collect(Collectors.toList());
	return nodes.isEmpty() ? null : String.join(DefStr.POINT_SEPERATOR, nodes);
}
 

@Override
public boolean isReachable(Object traversableObject, Node traversableProperty, Class<?> rootBeanType,
        Path pathToTraversableObject, ElementType elementType) {
    return false;
}
 

@Override
public boolean isCascadable(Object traversableObject, Node traversableProperty, Class<?> rootBeanType,
        Path pathToTraversableObject, ElementType elementType) {
    return false;
}
 

@Override
public boolean isReachable(Object traversableObject, Node traversableProperty, Class<?> rootBeanType,
        Path pathToTraversableObject,
        ElementType elementType) {
    return true;
}
 

@Override
public boolean isCascadable(Object traversableObject, Node traversableProperty, Class<?> rootBeanType,
        Path pathToTraversableObject,
        ElementType elementType) {
    return true;
}
 

public Object visitProperty(Object nodeObject, Node node) {
	ResourceRegistry resourceRegistry = context.getResourceRegistry();
	Class nodeClass = nodeObject.getClass();
	ResourceInformation resourceInformation = null;
	if (resourceRegistry.hasEntry(nodeClass)) {
		RegistryEntry entry = resourceRegistry.getEntry(nodeClass);
		resourceInformation = entry.getResourceInformation();
	}

	String name = node.getName();

	Object next;
	if (node.getKind() == ElementKind.PROPERTY) {
		if (resourceRegistry.hasEntry(nodeClass)) {
			ResourceFieldAccessor accessor = resourceInformation.getAccessor(name);
			if (accessor != null) {
				next = accessor.getValue(nodeObject);
			} else {
				next = PropertyUtils.getProperty(nodeObject, name);
			}
		} else {
			next = PropertyUtils.getProperty(nodeObject, name);
		}
	} else if (node.getKind() == ElementKind.BEAN) {
		next = nodeObject;
	} else {
		throw new UnsupportedOperationException("unknown node: " + node);
	}

	if (name != null) {
		ResourceField resourceField =
				resourceInformation != null ? resourceInformation.findFieldByUnderlyingName(name) : null;

		String mappedName = name;
		if (resourceField != null) {
			// in case of @JsonApiRelationId it will be mapped to original name
			resourceField = resourceInformation.findFieldByUnderlyingName(resourceField.getUnderlyingName());
			mappedName = resourceField.getJsonName();
		}

		appendSeparator();
		if (resourceField == null || resourceField.getResourceFieldType() == ResourceFieldType.ID) {
			// continue along attributes path or primary key on root
			appendSourcePointer(mappedName);
		} else if (resourceField != null && resourceField.getResourceFieldType() == ResourceFieldType.RELATIONSHIP) {
			appendSourcePointer("/data/relationships/");
			appendSourcePointer(mappedName);
		} else {

			appendSourcePointer("/data/attributes/");
			appendSourcePointer(mappedName);
		}
	}
	return next;
}
 

public PathImpl(List<? extends Node> nodes) {
	this.nodes = nodes;
}
 

@SuppressWarnings("unchecked")
@Override
public Iterator<Node> iterator() {
	return (Iterator<Node>) nodes.iterator();
}
 

@Override
public <T extends Node> T as(Class<T> nodeType) {
	throw new UnsupportedOperationException();
}
 

private String mountCategory( Iterator<Node> node ){
	ignoreMethodName( node );
	String joined = Joiner.on(".").join( node );
	return removeLastDotIndexIfAny(joined);
}