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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Form\Extension\Core\DataTransformer;
use Symfony\Component\Form\Extension\Core\ChoiceList\ChoiceListInterface;
use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\TransformationFailedException;
/**
* @author Bernhard Schussek <bschussek@gmail.com>
*/
class ChoiceToBooleanArrayTransformer implements DataTransformerInterface
{
private $choiceList;
private $placeholderPresent;
/**
* Constructor.
*
* @param ChoiceListInterface $choiceList
* @param Boolean $placeholderPresent
*/
public function __construct(ChoiceListInterface $choiceList, $placeholderPresent)
{
$this->choiceList = $choiceList;
$this->placeholderPresent = $placeholderPresent;
}
/**
* Transforms a single choice to a format appropriate for the nested
* checkboxes/radio buttons.
*
* The result is an array with the options as keys and true/false as values,
* depending on whether a given option is selected. If this field is rendered
* as select tag, the value is not modified.
*
* @param mixed $choice An array if "multiple" is set to true, a scalar
* value otherwise.
*
* @return mixed An array
*
* @throws TransformationFailedException If the given value is not scalar or
* if the choices can not be retrieved.
*/
public function transform($choice)
{
try {
$values = $this->choiceList->getValues();
} catch (\Exception $e) {
throw new TransformationFailedException('Can not get the choice list', $e->getCode(), $e);
}
$index = current($this->choiceList->getIndicesForChoices(array($choice)));
foreach ($values as $i => $value) {
$values[$i] = $i === $index;
}
if ($this->placeholderPresent) {
$values['placeholder'] = false === $index;
}
return $values;
}
/**
* Transforms a checkbox/radio button array to a single choice.
*
* The input value is an array with the choices as keys and true/false as
* values, depending on whether a given choice is selected. The output
* is the selected choice.
*
* @param array $values An array of values
*
* @return mixed A scalar value
*
* @throws TransformationFailedException If the given value is not an array,
* if the recuperation of the choices
* fails or if some choice can't be
* found.
*/
public function reverseTransform($values)
{
if (!is_array($values)) {
throw new TransformationFailedException('Expected an array.');
}
try {
$choices = $this->choiceList->getChoices();
} catch (\Exception $e) {
throw new TransformationFailedException('Can not get the choice list', $e->getCode(), $e);
}
foreach ($values as $i => $selected) {
if ($selected) {
if (isset($choices[$i])) {
return $choices[$i] === '' ? null : $choices[$i];
} elseif ($this->placeholderPresent && 'placeholder' === $i) {
return null;
} else {
throw new TransformationFailedException(sprintf('The choice "%s" does not exist', $i));
}
}
}
return null;
}
}
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