vendor/symfony/form/Symfony/Component/Form/Extension/Core/DataTransformer/ChoiceToValueTransformer.php

   1 <?php
   2
   3 /*
   4  * This file is part of the Symfony package.
   5  *
   6  * (c) Fabien Potencier <fabien@symfony.com>
   7  *
   8  * For the full copyright and license information, please view the LICENSE
   9  * file that was distributed with this source code.
  10  */
  11
  12 namespace Symfony\Component\Form\Extension\Core\DataTransformer;
  13
  14 use Symfony\Component\Form\DataTransformerInterface;
  15 use Symfony\Component\Form\Exception\TransformationFailedException;
  16 use Symfony\Component\Form\Extension\Core\ChoiceList\ChoiceListInterface;
  17
  18 /**
  19  * @author Bernhard Schussek <bschussek@gmail.com>
  20  */
  21 class ChoiceToValueTransformer implements DataTransformerInterface
  22 {
  23     private $choiceList;
  24
  25     /**
  26      * Constructor.
  27      *
  28      * @param ChoiceListInterface $choiceList
  29      */
  30     public function __construct(ChoiceListInterface $choiceList)
  31     {
  32         $this->choiceList = $choiceList;
  33     }
  34
  35     public function transform($choice)
  36     {
  37         return (string) current($this->choiceList->getValuesForChoices(array($choice)));
  38     }
  39
  40     public function reverseTransform($value)
  41     {
  42         if (null !== $value && !is_scalar($value)) {
  43             throw new TransformationFailedException('Expected a scalar.');
  44         }
  45
  46         // These are now valid ChoiceList values, so we can return null
  47         // right away
  48         if ('' === $value || null === $value) {
  49             return null;
  50         }
  51
  52         $choices = $this->choiceList->getChoicesForValues(array($value));
  53
  54         if (1 !== count($choices)) {
  55             throw new TransformationFailedException(sprintf('The choice "%s" does not exist or is not unique', $value));
  56         }
  57
  58         $choice = current($choices);
  59
  60         return '' === $choice ? null : $choice;
  61     }
  62 }