RendererRegistry.php

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<?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;
    }
}