AddLabels.php

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<?php
/* Copyright (c) 2017 Stefan Hecken <stefan.hecken@concepts-and-training.de> Extended GPL, see docs/LICENSE */

namespace ILIAS\Refinery\Container;

use ILIAS\Data\Factory;
use ILIAS\Data\Result;
use ILIAS\Refinery\Transformation;
use ILIAS\Refinery\DeriveInvokeFromTransform;

class AddLabels implements Transformation
{
    use DeriveInvokeFromTransform;

    protected $labels;

    private $factory;

    public function __construct(array $labels, Factory $factory)
    {
        $this->labels = $labels;
        $this->factory = $factory;
    }

    public function transform($from)
    {
        if (!is_array($from)) {
            throw new \InvalidArgumentException(__METHOD__ . " argument is not an array.");
        }

        if (count($from) != count($this->labels)) {
            throw new \InvalidArgumentException(__METHOD__ . " number of items in arrays are not equal.");
        }

        return array_combine($this->labels, $from);
    }

    public function applyTo(Result $data) : Result
    {
        $dataValue = $data->value();
        if (false === is_array($dataValue)) {
            $exception = new \InvalidArgumentException(__METHOD__ . " argument is not an array.");
            return $this->factory->error($exception);
        }

        if (count($dataValue) != count($this->labels)) {
            $exception = new \InvalidArgumentException(__METHOD__ . " number of items in arrays are not equal.");
            return $this->factory->error($exception);
        }

        $value = array_combine($this->labels, $dataValue);
        $result = $this->factory->ok($value);

        return $result;
    }
}