vendor/symfony/symfony/src/Symfony/Component/Config/Definition/BaseNode.php

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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\Config\Definition;

use Symfony\Component\Config\Definition\Exception\Exception;
use Symfony\Component\Config\Definition\Exception\ForbiddenOverwriteException;
use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
use Symfony\Component\Config\Definition\Exception\InvalidTypeException;

/**
 * The base node class.
 *
 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
 */
abstract class BaseNode implements NodeInterface
{
    protected $name;
    protected $parent;
    protected $normalizationClosures = array();
    protected $finalValidationClosures = array();
    protected $allowOverwrite = true;
    protected $required = false;
    protected $equivalentValues = array();
    protected $attributes = array();

    /**
     * Constructor.
     *
     * @param string        $name   The name of the node
     * @param NodeInterface $parent The parent of this node
     *
     * @throws \InvalidArgumentException if the name contains a period.
     */
    public function __construct($name, NodeInterface $parent = null)
    {
        if (false !== strpos($name, '.')) {
            throw new \InvalidArgumentException('The name must not contain ".".');
        }

        $this->name = $name;
        $this->parent = $parent;
    }

    public function setAttribute($key, $value)
    {
        $this->attributes[$key] = $value;
    }

    public function getAttribute($key, $default = null)
    {
        return isset($this->attributes[$key]) ? $this->attributes[$key] : $default;