MediaWizardProviderManager.php

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<?php
namespace TYPO3\CMS\Frontend\MediaWizard;

class MediaWizardProviderManager {

    static protected $providers = array();

    static public function registerMediaWizardProvider($className) {
        if (!isset(self::$providers[$className])) {
            $provider = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance($className);
            if (!$provider instanceof MediaWizardProviderInterface) {
                throw new \UnexpectedValueException($className . ' is registered as a mediaWizardProvider, so it must implement interface TYPO3\\CMS\\Frontend\\MediaWizard\\MediaWizardProviderInterface', 1285022360);
            }
            self::$providers[$className] = $provider;
        }
    }

    static public function getValidMediaWizardProvider($url) {
        // Go through registered providers in reverse order (last one registered wins)
        $providers = array_reverse(self::$providers, TRUE);
        foreach ($providers as $provider) {
            if ($provider->canHandle($url)) {
                return $provider;
            }
        }
        // No provider found
        return NULL;
    }

}