OnTheFly.php

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<?php
namespace TYPO3\CMS\Backend\Form\FormDataGroup;

/*
 * 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\Backend\Form\FormDataGroupInterface;
use TYPO3\CMS\Backend\Form\FormDataProviderInterface;
use TYPO3\CMS\Core\Utility\GeneralUtility;

class OnTheFly implements FormDataGroupInterface
{
    protected $providerList = [];

    public function compile(array $result)
    {
        if (empty($this->providerList)) {
            throw new \UnexpectedValueException(
                'Data provider list is empty, call setProviderList first',
                1441108674
            );
        }

        foreach ($this->providerList as $providerClassName) {
            $provider = GeneralUtility::makeInstance($providerClassName);

            if (!$provider instanceof FormDataProviderInterface) {
                throw new \UnexpectedValueException(
                    'Data provider ' . $providerClassName . ' must implement FormDataProviderInterface',
                    1441108719
                );
            }

            $result = $provider->addData($result);
        }

        return $result;
    }

    public function setProviderList(array $list)
    {
        $this->providerList = $list;
    }
}