public function onBindNormData(FilterDataEvent $event)
{
$originalData = $event->getForm()->getNormData();
// If we are not allowed to change anything, return immediately
if (!$this->allowAdd && !$this->allowDelete) {
// Don't set to the snapshot as then we are switching from the
// original object to its copy, which might break things
$event->setData($originalData);
return;
}
$form = $event->getForm();
$data = $event->getData();
$childPropertyPath = null;
$parentData = null;
$addMethod = null;
$removeMethod = null;
$propertyPath = null;
$plural = null;
if ($form->hasParent() && $form->getAttribute('property_path')) {
$propertyPath = new PropertyPath($form->getAttribute('property_path'));
$childPropertyPath = $propertyPath;
$parentData = $form->getParent()->getClientData();
$lastElement = $propertyPath->getElement($propertyPath->getLength() - 1);
// If the property path contains more than one element, the parent
// data is the object at the parent property path
if ($propertyPath->getLength() > 1) {
$parentData = $propertyPath->getParent()->getValue($parentData);
// Property path relative to $parentData
$childPropertyPath = new PropertyPath($lastElement);
}
// The plural form is the last element of the property path
$plural = ucfirst($lastElement);
}
if (null === $data) {
$data = array();
}
if (!is_array($data) && !($data instanceof \Traversable && $data instanceof \ArrayAccess)) {
throw new UnexpectedTypeException($data, 'array or (\\Traversable and \\ArrayAccess)');
}
if (null !== $originalData && !is_array($originalData) && !($originalData instanceof \Traversable && $originalData instanceof \ArrayAccess)) {
throw new UnexpectedTypeException($originalData, 'array or (\\Traversable and \\ArrayAccess)');
}
// Check if the parent has matching methods to add/remove items
if ($this->mergeStrategy & self::MERGE_INTO_PARENT && is_object($parentData)) {
$reflClass = new \ReflectionClass($parentData);
$addMethodNeeded = $this->allowAdd && !$this->addMethod;
$removeMethodNeeded = $this->allowDelete && !$this->removeMethod;
// Any of the two methods is required, but not yet known
if ($addMethodNeeded || $removeMethodNeeded) {
$singulars = (array) FormUtil::singularify($plural);
foreach ($singulars as $singular) {
// Try to find adder, but don't override preconfigured one
if ($addMethodNeeded) {
$addMethod = 'add' . $singular;
// False alert
if (!$this->isAccessible($reflClass, $addMethod, 1)) {
$addMethod = null;
}
}
// Try to find remover, but don't override preconfigured one
if ($removeMethodNeeded) {
$removeMethod = 'remove' . $singular;
// False alert
if (!$this->isAccessible($reflClass, $removeMethod, 1)) {
$removeMethod = null;
}
}
// Found all that we need. Abort search.
if ((!$addMethodNeeded || $addMethod) && (!$removeMethodNeeded || $removeMethod)) {
break;
}
// False alert
$addMethod = null;
$removeMethod = null;
}
}
// Set preconfigured adder
if ($this->allowAdd && $this->addMethod) {
$addMethod = $this->addMethod;
if (!$this->isAccessible($reflClass, $addMethod, 1)) {
throw new FormException(sprintf('The public method "%s" could not be found on class %s', $addMethod, $reflClass->getName()));
}
}
// Set preconfigured remover
if ($this->allowDelete && $this->removeMethod) {
$removeMethod = $this->removeMethod;
if (!$this->isAccessible($reflClass, $removeMethod, 1)) {
throw new FormException(sprintf('The public method "%s" could not be found on class %s', $removeMethod, $reflClass->getName()));
}
}
}
// Calculate delta between $data and the snapshot created in PRE_BIND
$itemsToDelete = array();
$itemsToAdd = is_object($data) ? clone $data : $data;
if ($this->dataSnapshot) {
foreach ($this->dataSnapshot as $originalItem) {
foreach ($data as $key => $item) {
if ($item === $originalItem) {
// Item found, next original item
unset($itemsToAdd[$key]);
continue 2;
}
}
// Item not found, remember for deletion
foreach ($originalData as $key => $item) {
if ($item === $originalItem) {
$itemsToDelete[$key] = $item;
continue 2;
}
}
}
}
if ($addMethod || $removeMethod) {
// If methods to add and to remove exist, call them now, if allowed
if ($removeMethod) {
foreach ($itemsToDelete as $item) {
$parentData->{$removeMethod}($item);
}
}
if ($addMethod) {
foreach ($itemsToAdd as $item) {
$parentData->{$addMethod}($item);
}
}
$event->setData($childPropertyPath->getValue($parentData));
} elseif ($this->mergeStrategy & self::MERGE_NORMAL) {
if (!$originalData) {
// No original data was set. Set it if allowed
if ($this->allowAdd) {
$originalData = $data;
}
} else {
// Original data is an array-like structure
// Add and remove items in the original variable
if ($this->allowDelete) {
foreach ($itemsToDelete as $key => $item) {
unset($originalData[$key]);
}
}
if ($this->allowAdd) {
foreach ($itemsToAdd as $key => $item) {
if (!isset($originalData[$key])) {
$originalData[$key] = $item;
} else {
$originalData[] = $item;
}
}
}
}
$event->setData($originalData);
}
}
