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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\ChoiceList; use Symfony\Component\Form\Exception\InvalidArgumentException; /** * A choice list that is loaded lazily * * This list loads itself as soon as any of the getters is accessed for the * first time. You should implement loadChoiceList() in your child classes, * which should return a ChoiceListInterface instance. * * @author Bernhard Schussek <bschussek@gmail.com> */ abstract class LazyChoiceList implements ChoiceListInterface { /** * The loaded choice list * * @var ChoiceListInterface */ private $choiceList; /** * {@inheritdoc} */ public function getChoices() { if (!$this->choiceList) { $this->load(); } return $this->choiceList->getChoices(); } /** * {@inheritdoc} */ public function getValues() { if (!$this->choiceList) { $this->load(); } return $this->choiceList->getValues(); } /** * {@inheritdoc} */ public function getPreferredViews() { if (!$this->choiceList) { $this->load(); } return $this->choiceList->getPreferredViews(); } /** * {@inheritdoc} */ public function getRemainingViews() { if (!$this->choiceList) { $this->load(); } return $this->choiceList->getRemainingViews(); } /** * {@inheritdoc} */ public function getChoicesForValues(array $values) { if (!$this->choiceList) { $this->load(); } return $this->choiceList->getChoicesForValues($values); } /** * {@inheritdoc} */ public function getValuesForChoices(array $choices) { if (!$this->choiceList) { $this->load(); } return $this->choiceList->getValuesForChoices($choices); } /** * {@inheritdoc} * * @deprecated Deprecated since version 2.4, to be removed in 3.0. */ public function getIndicesForChoices(array $choices) { if (!$this->choiceList) { $this->load(); } return $this->choiceList->getIndicesForChoices($choices); } /** * {@inheritdoc} * * @deprecated Deprecated since version 2.4, to be removed in 3.0. */ public function getIndicesForValues(array $values) { if (!$this->choiceList) { $this->load(); } return $this->choiceList->getIndicesForValues($values); } /** * Loads the choice list * * Should be implemented by child classes. * * @return ChoiceListInterface The loaded choice list */ abstract protected function loadChoiceList(); private function load() { $choiceList = $this->loadChoiceList(); if (!$choiceList instanceof ChoiceListInterface) { throw new InvalidArgumentException(sprintf('loadChoiceList() should return a ChoiceListInterface instance. Got %s', gettype($choiceList))); } $this->choiceList = $choiceList; } }