ExtractorRegistry.php

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<?php
namespace TYPO3\CMS\Core\Resource\Index;

use TYPO3\CMS\Core\SingletonInterface;
use TYPO3\CMS\Core\Utility\GeneralUtility;

class ExtractorRegistry implements SingletonInterface {

    protected $extractors = array();

    protected $instances = NULL;

    public static function getInstance() {
        return \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Resource\\Index\\ExtractorRegistry');
    }

    public function registerExtractionService($className) {
        if (!class_exists($className)) {
            throw new \InvalidArgumentException('The class "' . $className . '" you are registering is not available', 1422705270);
        } elseif (!in_array('TYPO3\\CMS\\Core\\Resource\\Index\\ExtractorInterface', class_implements($className))) {
            throw new \InvalidArgumentException('The extractor needs to implement the ExtractorInterface', 1422705271);
        } else {
            $this->extractors[] = $className;
        }
    }

    public function getExtractors() {
        if ($this->instances === NULL) {
            $this->instances = array();

            $extractors = array_reverse($this->extractors);
            foreach ($extractors as $className) {
                $object = $this->createExtractorInstance($className);
                $this->instances[] = $object;
            }

            if (count($this->instances) > 1) {
                usort($this->instances, array($this, 'compareExtractorPriority'));
            }
        }
        return $this->instances;
    }

    public function getExtractorsWithDriverSupport($driverType) {
        $allExtractors = $this->getExtractors();

        $filteredExtractors = array();
        foreach ($allExtractors as $priority => $extractorObject) {
            if (count($extractorObject->getDriverRestrictions()) == 0) {
                $filteredExtractors[$priority] = $extractorObject;
            } elseif (in_array($driverType, $extractorObject->getDriverRestrictions())) {
                $filteredExtractors[$priority] = $extractorObject;
            }
        }
        return $filteredExtractors;
    }

    protected function compareExtractorPriority(ExtractorInterface $extractorA, ExtractorInterface $extractorB) {
        return $extractorB->getPriority() - $extractorA->getPriority();
    }

    protected function createExtractorInstance($className) {
        return GeneralUtility::makeInstance($className);
    }


}