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Edit File: StaticMethodLoader.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\Validator\Mapping\Loader;

use Symfony\Component\Validator\Exception\MappingException;
use Symfony\Component\Validator\Mapping\ClassMetadata;

class StaticMethodLoader implements LoaderInterface
{
    protected $methodName;

public function __construct($methodName = 'loadValidatorMetadata')
    {
        $this->methodName = $methodName;
    }

/**
     * {@inheritDoc}
     */
    public function loadClassMetadata(ClassMetadata $metadata)
    {
        /** @var \ReflectionClass $reflClass */
        $reflClass = $metadata->getReflectionClass();

if (!$reflClass->isInterface() && $reflClass->hasMethod($this->methodName)) {
            $reflMethod = $reflClass->getMethod($this->methodName);

if ($reflMethod->isAbstract()) {
                return false;
            }

if (!$reflMethod->isStatic()) {
                throw new MappingException(sprintf('The method %s::%s should be static', $reflClass->name, $this->methodName));
            }

if ($reflMethod->getDeclaringClass()->name != $reflClass->name) {
                return false;
            }

$reflMethod->invoke(null, $metadata);

return true;
        }

return false;
    }
}