<?php

/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\HTML;

/**
 * Defines the trait for a HTML Registry aware class.
 *
 * @since  4.0.0
 */
trait HTMLRegistryAwareTrait
{
    /**
     * The registry
     *
     * @var    Registry
     * @since  4.0.0
     */
    private $registry;

    /**
     * Get the registry.
     *
     * @return  Registry
     *
     * @since   4.0.0
     * @throws  \UnexpectedValueException May be thrown if the registry has not been set.
     */
    public function getRegistry()
    {
        if ($this->registry) {
            return $this->registry;
        }

        throw new \UnexpectedValueException('HTML registry not set in ' . __CLASS__);
    }

    /**
     * Set the registry to use.
     *
     * @param   Registry  $registry  The registry
     *
     * @return  void
     *
     * @since   4.0.0
     */
    public function setRegistry(Registry $registry = null)
    {
        $this->registry = $registry;
    }
}
