SelectElement.php

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<?php
namespace TYPO3\CMS\Form\Domain\Model\Element;

class SelectElement extends \TYPO3\CMS\Form\Domain\Model\Element\ContainerElement {

    protected $allowedAttributes = array(
        'class' => '',
        'disabled' => '',
        'id' => '',
        'lang' => '',
        'multiple' => '',
        'name' => '',
        'size' => '',
        'style' => '',
        'tabindex' => '',
        'title' => ''
    );

    protected $mandatoryAttributes = array(
        'name',
        'id'
    );

    public function addElement(\TYPO3\CMS\Form\Domain\Model\Element\AbstractElement $element) {
        if (
            !($element instanceof \TYPO3\CMS\Form\Domain\Model\Element\OptionElement)
            && !($element instanceof \TYPO3\CMS\Form\Domain\Model\Element\OptgroupElement)
        ) {
            throw new \InvalidArgumentException('Element type "' . get_class($element) . '" is not supported.', 1442928537);
        }
        $element->setParentName($this->getName());
        $this->elements[] = $element;
        return $this;
    }

    public function setAttribute($attribute, $value) {
        if (array_key_exists($attribute, $this->allowedAttributes)) {
            $this->attributes->addAttribute($attribute, $value);
        }
        if (
            $attribute === 'name' && $this->attributes->hasAttribute('multiple') &&
            $this->attributes->getValue('multiple') === 'multiple' ||
            $attribute === 'multiple' && $this->attributes->hasAttribute('name')
        ) {
            $nameAttribute = $this->attributes->getAttributeObjectByKey('name');
            $nameAttribute->setAddition('[]');
        }
        return $this;
    }

}