9.5/_renderer_registry_8php_source.html

<?php

namespace ‪TYPO3\CMS\Core\Resource\Rendering;


/*

 * This file is part of the TYPO3 CMS project.

 *

 * It is free software; you can redistribute it and/or modify it under

 * the terms of the GNU General Public License, either version 2

 * of the License, or any later version.

 *

 * For the full copyright and license information, please read the

 * LICENSE.txt file that was distributed with this source code.

 *

 * The TYPO3 project - inspiring people to share!

 */


use ‪TYPO3\CMS\Core\Resource\FileInterface;

use ‪TYPO3\CMS\Core\Utility\GeneralUtility;


class ‪RendererRegistry implements ‪\TYPO3\CMS\Core\SingletonInterface

{

    protected ‪$classNames = [];


    protected ‪$instances;


    public static function ‪getInstance()

    {

        return GeneralUtility::makeInstance(self::class);

    }


    public function ‪registerRendererClass($className)

    {

        if (!class_exists($className)) {

            throw new \InvalidArgumentException('The class "' . $className . '" you are trying to register is not available', 1411840171);

        }

        if (!in_array(FileRendererInterface::class, class_implements($className), true)) {

            throw new \InvalidArgumentException('The renderer needs to implement the FileRendererInterface', 1411840172);

        }

        $this->classNames[] = $className;

    }


    public function ‪getRendererInstances()

    {

        if ($this->instances === null) {

            $this->instances = [];


            // As the result is in reverse order we need to reverse

            // the array before processing to keep the items with same

            // priority in the same order as they were added to the registry.

            ‪$classNames = array_reverse($this->classNames);

            foreach (‪$classNames as $className) {

                $object = $this->‪createRendererInstance($className);

                $this->instances[] = $object;

            }


            if (count($this->instances) > 1) {

                usort($this->instances, [$this, 'compareRendererPriority']);

            }

        }

        return ‪$this->instances;

    }


    protected function ‪createRendererInstance($className)

    {

        return GeneralUtility::makeInstance($className);

    }


    protected function ‪compareRendererPriority(‪FileRendererInterface $rendererA, ‪FileRendererInterface $rendererB)

    {

        return $rendererB->‪getPriority() - $rendererA->‪getPriority();

    }


    public function ‪getRenderer(‪FileInterface $file)

    {

        $matchingFileRenderer = null;


        foreach ($this->‪getRendererInstances() as $fileRenderer) {

            if ($fileRenderer->canRender($file)) {

                $matchingFileRenderer = $fileRenderer;

                break;

            }

        }

        return $matchingFileRenderer;

    }

}