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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 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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