ContainerElementView.php

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<?php
namespace TYPO3\CMS\Form\View\Form\Element;

class ContainerElementView extends \TYPO3\CMS\Form\View\Form\Element\AbstractElementView {

    protected $containerWrap = '
        <ol>
            <elements />
        </ol>
    ';

    public function getChildElements(\DOMDocument $dom) {
        $modelChildren = $this->model->getElements();
        $documentFragment = $dom->createDocumentFragment();
        foreach ($modelChildren as $key => $modelChild) {
            $child = $this->createChildElementFromModel($modelChild);
            if ($child->noWrap() === TRUE) {
                $childNode = $child->render();
            } else {
                $childNode = $child->render('elementWrap');
                $class = '';
                if (strlen($childNode->getAttribute('class')) > 0) {
                    $class = $childNode->getAttribute('class') . ' ';
                }
                $class .= $child->getElementWraps();
                $childNode->setAttribute('class', $class);
            }
            $importedNode = $dom->importNode($childNode, TRUE);
            $documentFragment->appendChild($importedNode);
        }
        return $documentFragment;
    }

    public function createChildElementFromModel($modelChild) {
        $childElement = NULL;
        $class = \TYPO3\CMS\Form\Utility\FormUtility::getInstance()->getLastPartOfClassName($modelChild);
        $className = 'TYPO3\\CMS\\Form\\View\\Form\\Element\\' . ucfirst($class) . 'ElementView';
        if (class_exists($className)) {
            $childElement = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance($className, $modelChild);
        }
        return $childElement;
    }

}