StringTransformation.php

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<?php

declare(strict_types=1);

namespace ILIAS\Refinery\To\Transformation;

use ILIAS\Refinery\DeriveApplyToFromTransform;
use ILIAS\Refinery\DeriveInvokeFromTransform;
use ILIAS\Refinery\Constraint;
use ILIAS\Refinery\ProblemBuilder;
use UnexpectedValueException;

class StringTransformation implements Constraint
{
    use DeriveApplyToFromTransform;
    use DeriveInvokeFromTransform;
    use ProblemBuilder;

    public function transform($from): string
    {
        $this->check($from);
        return (string) $from;
    }

    public function getError(): string
    {
        return 'The value MUST be of type string.';
    }

    public function check($value)
    {
        if (!$this->accepts($value)) {
            throw new UnexpectedValueException($this->getErrorMessage($value));
        }

        return null;
    }

    public function accepts($value): bool
    {
        return is_string($value);
    }

    public function problemWith($value): ?string
    {
        if (!$this->accepts($value)) {
            return $this->getErrorMessage($value);
        }

        return null;
    }
}