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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;
}
}