<?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);
}}