NullTransformation.php

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<?php declare(strict_types=1);

/* Copyright (c) 2020 Nils Haagen <nils.haagen@concepts-and-training.de>, Extended GPL, see docs/LICENSE */

namespace ILIAS\Refinery\KindlyTo\Transformation;

use ILIAS\Refinery\DeriveApplyToFromTransform;
use ILIAS\Refinery\DeriveInvokeFromTransform;
use ILIAS\Refinery\Transformation;
use ILIAS\Refinery\ConstraintViolationException;

class NullTransformation implements Transformation
{
    use DeriveApplyToFromTransform;
    use DeriveInvokeFromTransform;

    public function transform($from)
    {
        if (is_null($from)) {
            return null;
        }
        if (is_string($from) && trim($from) === '') {
            return null;
        }
        throw new ConstraintViolationException(
            sprintf('The value "%s" could not be transformed into null', var_export($from, true)),
            'not_null',
            $from
        );
    }
}