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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Form\Extension\Core\EventListener;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Form\FormEvents;
use Symfony\Component\Form\FormEvent;
use Symfony\Component\Form\Exception\UnexpectedTypeException;
/**
* @author Bernhard Schussek <bschussek@gmail.com>
*/
class MergeCollectionListener implements EventSubscriberInterface
{
/**
* Whether elements may be added to the collection
* @var Boolean
*/
private $allowAdd;
/**
* Whether elements may be removed from the collection
* @var Boolean
*/
private $allowDelete;
/**
* Creates a new listener.
*
* @param Boolean $allowAdd Whether values might be added to the
* collection.
* @param Boolean $allowDelete Whether values might be removed from the
* collection.
*/
public function __construct($allowAdd = false, $allowDelete = false)
{
$this->allowAdd = $allowAdd;
$this->allowDelete = $allowDelete;
}
public static function getSubscribedEvents()
{
return array(
FormEvents::SUBMIT => 'onSubmit',
);
}
public function onSubmit(FormEvent $event)
{
$dataToMergeInto = $event->getForm()->getNormData();
$data = $event->getData();
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 !== $dataToMergeInto && !is_array($dataToMergeInto) && !($dataToMergeInto instanceof \Traversable && $dataToMergeInto instanceof \ArrayAccess)) {
throw new UnexpectedTypeException($dataToMergeInto, 'array or (\Traversable and \ArrayAccess)');
}
// If we are not allowed to change anything, return immediately
if ((!$this->allowAdd && !$this->allowDelete) || $data === $dataToMergeInto) {
$event->setData($dataToMergeInto);
return;
}
if (!$dataToMergeInto) {
// No original data was set. Set it if allowed
if ($this->allowAdd) {
$dataToMergeInto = $data;
}
} else {
// Calculate delta
$itemsToAdd = is_object($data) ? clone $data : $data;
$itemsToDelete = array();
foreach ($dataToMergeInto as $beforeKey => $beforeItem) {
foreach ($data as $afterKey => $afterItem) {
if ($afterItem === $beforeItem) {
// Item found, next original item
unset($itemsToAdd[$afterKey]);
continue 2;
}
}
// Item not found, remember for deletion
$itemsToDelete[] = $beforeKey;
}
// Remove deleted items before adding to free keys that are to be
// replaced
if ($this->allowDelete) {
foreach ($itemsToDelete as $key) {
unset($dataToMergeInto[$key]);
}
}
// Add remaining items
if ($this->allowAdd) {
foreach ($itemsToAdd as $key => $item) {
if (!isset($dataToMergeInto[$key])) {
$dataToMergeInto[$key] = $item;
} else {
$dataToMergeInto[] = $item;
}
}
}
}
$event->setData($dataToMergeInto);
}
/**
* Alias of {@link onSubmit()}.
*
* @deprecated Deprecated since version 2.3, to be removed in 3.0. Use
* {@link onSubmit()} instead.
*/
public function onBind(FormEvent $event)
{
$this->onSubmit($event);
}
}
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