102 lines
2.6 KiB
PHP
102 lines
2.6 KiB
PHP
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Form\ChoiceList;
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use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface;
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/**
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* A choice list that loads its choices lazily.
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*
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* The choices are fetched using a {@link ChoiceLoaderInterface} instance.
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* If only {@link getChoicesForValues()} or {@link getValuesForChoices()} is
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* called, the choice list is only loaded partially for improved performance.
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*
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* Once {@link getChoices()} or {@link getValues()} is called, the list is
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* loaded fully.
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*
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* @author Bernhard Schussek <bschussek@gmail.com>
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*/
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class LazyChoiceList implements ChoiceListInterface
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{
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private $loader;
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/**
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* The callable creating string values for each choice.
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*
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* If null, choices are cast to strings.
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*/
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private ?\Closure $value;
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/**
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* Creates a lazily-loaded list using the given loader.
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*
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* Optionally, a callable can be passed for generating the choice values.
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* The callable receives the choice as first and the array key as the second
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* argument.
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*
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* @param callable|null $value The callable generating the choice values
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*/
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public function __construct(ChoiceLoaderInterface $loader, callable $value = null)
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{
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$this->loader = $loader;
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$this->value = null === $value || $value instanceof \Closure ? $value : \Closure::fromCallable($value);
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}
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/**
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* {@inheritdoc}
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*/
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public function getChoices(): array
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{
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return $this->loader->loadChoiceList($this->value)->getChoices();
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}
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/**
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* {@inheritdoc}
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*/
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public function getValues(): array
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{
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return $this->loader->loadChoiceList($this->value)->getValues();
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}
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/**
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* {@inheritdoc}
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*/
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public function getStructuredValues(): array
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{
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return $this->loader->loadChoiceList($this->value)->getStructuredValues();
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}
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/**
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* {@inheritdoc}
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*/
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public function getOriginalKeys(): array
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{
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return $this->loader->loadChoiceList($this->value)->getOriginalKeys();
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}
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/**
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* {@inheritdoc}
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*/
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public function getChoicesForValues(array $values): array
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{
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return $this->loader->loadChoicesForValues($values, $this->value);
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}
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/**
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* {@inheritdoc}
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*/
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public function getValuesForChoices(array $choices): array
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{
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return $this->loader->loadValuesForChoices($choices, $this->value);
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}
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}
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