DefaultValueResolver.php

<?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\HttpKernel\Controller\ArgumentResolver;

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\Controller\ValueResolverInterface;
use Symfony\Component\HttpKernel\ControllerMetadata\ArgumentMetadata;

/**
 * Yields the default value defined in the action signature when no value has been given.
 *
 * @author Iltar van der Berg <kjarli@gmail.com>
 */
final class DefaultValueResolver implements ValueResolverInterface {
    public function resolve(Request $request, ArgumentMetadata $argument) : array {
        if ($argument->hasDefaultValue()) {
            return [
                $argument->getDefaultValue(),
            ];
        }
        if (null !== $argument->getType() && $argument->isNullable() && !$argument->isVariadic()) {
            return [
                null,
            ];
        }
        return [];
    }

}