DictionaryTransformation.php

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<?php
declare(strict_types=1);
/* Copyright (c) 1998-2019 ILIAS open source, Extended GPL, see docs/LICENSE */

namespace ILIAS\Refinery\To\Transformation;

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

class DictionaryTransformation implements Transformation
{
    use DeriveApplyToFromTransform;
    use DeriveInvokeFromTransform;

    private $transformation;

    public function __construct(Transformation $transformation)
    {
        $this->transformation = $transformation;
    }

    public function transform($from)
    {
        if (false === is_array($from)) {
            throw new ConstraintViolationException(
                'The value MUST be an array',
                'not_array'
            );
        }

        $result = array();
        foreach ($from as $key => $value) {
            if (false === is_string($key)) {
                throw new ConstraintViolationException(
                    'The key "%s" is NOT a string',
                    'key_is_not_a_string'
                );
            }

            $transformedValue = $this->transformation->transform($value);
            $result[$key] = $transformedValue;
        }

        return $result;
    }
}