/usr/share/php/Symfony/Component/Form/ChoiceList/Factory/CachingFactoryDecorator.php is in php-symfony-form 3.4.6+dfsg-1.
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/*
* 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\ChoiceList\Factory;
use Symfony\Component\Form\ChoiceList\ChoiceListInterface;
use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface;
use Symfony\Component\Form\ChoiceList\View\ChoiceListView;
/**
* Caches the choice lists created by the decorated factory.
*
* @author Bernhard Schussek <bschussek@gmail.com>
*/
class CachingFactoryDecorator implements ChoiceListFactoryInterface
{
private $decoratedFactory;
/**
* @var ChoiceListInterface[]
*/
private $lists = array();
/**
* @var ChoiceListView[]
*/
private $views = array();
/**
* Generates a SHA-256 hash for the given value.
*
* Optionally, a namespace string can be passed. Calling this method will
* the same values, but different namespaces, will return different hashes.
*
* @param mixed $value The value to hash
* @param string $namespace Optional. The namespace
*
* @return string The SHA-256 hash
*
* @internal
*/
public static function generateHash($value, $namespace = '')
{
if (is_object($value)) {
$value = spl_object_hash($value);
} elseif (is_array($value)) {
array_walk_recursive($value, function (&$v) {
if (is_object($v)) {
$v = spl_object_hash($v);
}
});
}
return hash('sha256', $namespace.':'.serialize($value));
}
/**
* Flattens an array into the given output variable.
*
* @param array $array The array to flatten
* @param array $output The flattened output
*
* @internal
*/
private static function flatten(array $array, &$output)
{
if (null === $output) {
$output = array();
}
foreach ($array as $key => $value) {
if (is_array($value)) {
self::flatten($value, $output);
continue;
}
$output[$key] = $value;
}
}
public function __construct(ChoiceListFactoryInterface $decoratedFactory)
{
$this->decoratedFactory = $decoratedFactory;
}
/**
* Returns the decorated factory.
*
* @return ChoiceListFactoryInterface The decorated factory
*/
public function getDecoratedFactory()
{
return $this->decoratedFactory;
}
/**
* {@inheritdoc}
*/
public function createListFromChoices($choices, $value = null)
{
if ($choices instanceof \Traversable) {
$choices = iterator_to_array($choices);
}
// The value is not validated on purpose. The decorated factory may
// decide which values to accept and which not.
// We ignore the choice groups for caching. If two choice lists are
// requested with the same choices, but a different grouping, the same
// choice list is returned.
self::flatten($choices, $flatChoices);
$hash = self::generateHash(array($flatChoices, $value), 'fromChoices');
if (!isset($this->lists[$hash])) {
$this->lists[$hash] = $this->decoratedFactory->createListFromChoices($choices, $value);
}
return $this->lists[$hash];
}
/**
* {@inheritdoc}
*/
public function createListFromLoader(ChoiceLoaderInterface $loader, $value = null)
{
$hash = self::generateHash(array($loader, $value), 'fromLoader');
if (!isset($this->lists[$hash])) {
$this->lists[$hash] = $this->decoratedFactory->createListFromLoader($loader, $value);
}
return $this->lists[$hash];
}
/**
* {@inheritdoc}
*/
public function createView(ChoiceListInterface $list, $preferredChoices = null, $label = null, $index = null, $groupBy = null, $attr = null)
{
// The input is not validated on purpose. This way, the decorated
// factory may decide which input to accept and which not.
$hash = self::generateHash(array($list, $preferredChoices, $label, $index, $groupBy, $attr));
if (!isset($this->views[$hash])) {
$this->views[$hash] = $this->decoratedFactory->createView(
$list,
$preferredChoices,
$label,
$index,
$groupBy,
$attr
);
}
return $this->views[$hash];
}
}
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