vendor/symfony/symfony/src/Symfony/Component/DomCrawler/Link.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\DomCrawler;

/**
 * Link represents an HTML link (an HTML a, area or link tag).
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class Link
{
    /**
     * @var \DOMElement
     */
    protected $node;

    /**
     * @var string The method to use for the link
     */
    protected $method;

    /**
     * @var string The URI of the page where the link is embedded (or the base href)
     */
    protected $currentUri;

    /**
     * Constructor.
     *
     * @param \DOMElement $node       A \DOMElement instance
     * @param string      $currentUri The URI of the page where the link is embedded (or the base href)
     * @param string      $method     The method to use for the link (get by default)
     *
     * @throws \InvalidArgumentException if the node is not a link
     */
    public function __construct(\DOMElement $node, $currentUri, $method = 'GET')
    {
        if (!in_array(strtolower(substr($currentUri, 0, 4)), array('http', 'file'))) {
            throw new \InvalidArgumentException(sprintf('Current URI must be an absolute URL ("%s").', $currentUri));
        }

        $this->setNode($node);
        $this->method = $method ? strtoupper($method) : null;
        $this->currentUri = $currentUri;
    }

    /**
     * Gets the node associated with this link.
     *
     * @return \DOMElement A \DOMElement instance
     */