/**
* Called for each node of the graph that is being traversed.
*
* @param mixed $data the data depends on the direction, and type of visitor
* @param null|array $type array has the format ["name" => string, "params" => array]
* @param VisitorInterface $visitor
*
* @return mixed the return value depends on the direction, and type of visitor
*/
public function accept($data, array $type = null, VisitorInterface $visitor)
{
// If the type was not given, we infer the most specific type from the
// input data in serialization mode.
if (null === $type) {
if (!$this->context->isSerializing()) {
$msg = 'The type must be given for all properties when deserializing.';
if (null !== ($path = $this->context->getPath())) {
$msg .= ' Path: ' . $path;
}
throw new \RuntimeException($msg);
}
$typeName = gettype($data);
if ('object' === $typeName) {
$typeName = get_class($data);
}
$type = array('name' => $typeName, 'params' => array());
} else {
if ($this->context->isSerializing() && null === $data) {
$type = array('name' => 'NULL', 'params' => array());
}
}
switch ($type['name']) {
case 'NULL':
return $visitor->visitNull($data, $type);
case 'string':
return $visitor->visitString($data, $type);
case 'integer':
return $visitor->visitInteger($data, $type);
case 'boolean':
return $visitor->visitBoolean($data, $type);
case 'double':
case 'float':
return $visitor->visitDouble($data, $type);
case 'array':
return $visitor->visitArray($data, $type);
case 'resource':
$msg = 'Resources are not supported in serialized data.';
if (null !== ($path = $this->context->getPath())) {
$msg .= ' Path: ' . $path;
}
throw new \RuntimeException($msg);
default:
$isSerializing = $this->context->isSerializing();
if ($isSerializing && null !== $data) {
if ($this->context->isVisiting($data)) {
return null;
}
$this->context->startVisiting($data);
}
// First, try whether a custom handler exists for the given type. This is done
// before loading metadata because the type name might not be a class, but
// could also simply be an artifical type.
if (null !== ($handler = $this->handlerRegistry->getHandler($this->context->getDirection(), $type['name'], $this->context->getFormat()))) {
$rs = call_user_func($handler, $visitor, $data, $type);
$this->context->stopVisiting($data);
return $rs;
}
// Trigger pre-serialization callbacks, and listeners if they exist.
if ($isSerializing) {
if (null !== $this->dispatcher && $this->dispatcher->hasListeners('serializer.pre_serialize', $type['name'], $this->context->getFormat())) {
$this->dispatcher->dispatch('serializer.pre_serialize', $type['name'], $this->context->getFormat(), $event = new PreSerializeEvent($visitor, $data, $type));
$type = $event->getType();
}
}
// Load metadata, and check whether this class should be excluded.
$metadata = $this->metadataFactory->getMetadataForClass($type['name']);
if (null !== $this->exclusionStrategy && $this->exclusionStrategy->shouldSkipClass($metadata, $this->context)) {
$this->context->stopVisiting($data);
return null;
}
if ($isSerializing) {
foreach ($metadata->preSerializeMethods as $method) {
$method->invoke($data);
}
}
$object = $data;
if (!$isSerializing) {
$object = $this->objectConstructor->construct($visitor, $metadata, $data, $type);
}
if (isset($metadata->handlerCallbacks[$this->context->getDirection()][$this->context->getFormat()])) {
$rs = $object->{$metadata->handlerCallbacks[$this->context->getDirection()][$this->context->getFormat()]}($visitor, $isSerializing ? null : $data);
$this->afterVisitingObject($visitor, $metadata, $object, $type);
return $isSerializing ? $rs : $object;
}
$visitor->startVisitingObject($metadata, $object, $type);
foreach ($metadata->propertyMetadata as $propertyMetadata) {
if (null !== $this->exclusionStrategy && $this->exclusionStrategy->shouldSkipProperty($propertyMetadata, $this->context)) {
continue;
}
if (!$isSerializing && $propertyMetadata->readOnly) {
continue;
}
$visitor->visitProperty($propertyMetadata, $data);
}
if ($isSerializing) {
$this->afterVisitingObject($visitor, $metadata, $data, $type);
return $visitor->endVisitingObject($metadata, $data, $type);
}
$rs = $visitor->endVisitingObject($metadata, $data, $type);
$this->afterVisitingObject($visitor, $metadata, $rs, $type);
return $rs;
}
}