BooleanTransformation.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\Refinery\To\Transformation;
 
use ILIAS\Refinery\DeriveApplyToFromTransform;
use ILIAS\Refinery\Constraint;
use ILIAS\Refinery\DeriveInvokeFromTransform;
use ILIAS\Refinery\ProblemBuilder;
use UnexpectedValueException;
 
class BooleanTransformation implements Constraint
{
    use DeriveApplyToFromTransform;
    use DeriveInvokeFromTransform;
    use ProblemBuilder;
 
    public function transform($from): bool
    {
        $this->check($from);
        return (bool) $from;
    }
 
    public function getError(): string
    {
        return 'The value MUST be of type boolean.';
    }
 
    public function check($value)
    {
        if (!$this->accepts($value)) {
            throw new UnexpectedValueException($this->getErrorMessage($value));
        }
 
        return null;
    }
 
    public function accepts($value): bool
    {
        return is_bool($value);
    }
 
    public function problemWith($value): ?string
    {
        if (!$this->accepts($value)) {
            return $this->getErrorMessage($value);
        }
 
        return null;
    }
}