DeriveTransformFromApplyTo.php

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<?php
/* Copyright (c) 1998-2019 ILIAS open source, Extended GPL, see docs/LICENSE */

namespace ILIAS\Refinery;

use ILIAS\Data\Result;

trait DeriveTransformFromApplyTo
{
    abstract public function applyTo(Result $result) : Result;

    public function transform($from)
    {
        $result = $this->applyTo(new Result\Ok($from));
        if (true === $result->isError()) {
            $error = $result->error();

            if ($error instanceof \Exception) {
                throw $error;
            }

            throw new \Exception($error);
        }
        return $result->value();
    }
}