NullElementHelper.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\MetaData\Vocabularies\Slots;
 
use ILIAS\MetaData\Elements\ElementInterface;
 
class NullElementHelper implements ElementHelperInterface
{
    public function slotForElement(ElementInterface $element): Identifier
    {
        return Identifier::NULL;
    }
 
    public function slotsForElementWithoutCondition(ElementInterface $element): \Generator
    {
        yield from [];
    }
 
    public function potentialSlotForElementByCondition(
        ElementInterface $element,
        ElementInterface $element_in_condition,
        string $value
    ): Identifier {
        return Identifier::NULL;
    }
 
    public function findElementOfCondition(
        Identifier $slot,
        ElementInterface $element,
        ElementInterface ...$all_elements
    ): ?ElementInterface {
        return null;
    }
}