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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\ChoiceList;
use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface;
/**
* A choice list that loads its choices lazily.
*
* The choices are fetched using a {@link ChoiceLoaderInterface} instance.
* If only {@link getChoicesForValues()} or {@link getValuesForChoices()} is
* called, the choice list is only loaded partially for improved performance.
*
* Once {@link getChoices()} or {@link getValues()} is called, the list is
* loaded fully.
*
* @author Bernhard Schussek <bschussek@gmail.com>
*/
class LazyChoiceList implements ChoiceListInterface
{
private $loader;
/**
* The callable creating string values for each choice.
*
* If null, choices are cast to strings.
*
* @var callable|null
*/
private $value;
/**
* Creates a lazily-loaded list using the given loader.
*
* Optionally, a callable can be passed for generating the choice values.
* The callable receives the choice as first and the array key as the second
* argument.
*
* @param ChoiceLoaderInterface $loader The choice loader
* @param callable|null $value The callable generating the choice values
*/
public function __construct(ChoiceLoaderInterface $loader, callable $value = null)
{
$this->loader = $loader;
$this->value = $value;
}
/**
* {@inheritdoc}
*/
public function getChoices()
{
return $this->loader->loadChoiceList($this->value)->getChoices();
}
/**
* {@inheritdoc}
*/
public function getValues()
{
return $this->loader->loadChoiceList($this->value)->getValues();
}
/**
* {@inheritdoc}
*/
public function getStructuredValues()
{
return $this->loader->loadChoiceList($this->value)->getStructuredValues();
}
/**
* {@inheritdoc}
*/
public function getOriginalKeys()
{
return $this->loader->loadChoiceList($this->value)->getOriginalKeys();
}
/**
* {@inheritdoc}
*/
public function getChoicesForValues(array $values)
{
return $this->loader->loadChoicesForValues($values, $this->value);
}
/**
* {@inheritdoc}
*/
public function getValuesForChoices(array $choices)
{
return $this->loader->loadValuesForChoices($choices, $this->value);
}
}
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