8000 [Form] add `CallbackChoiceLoader` · symfony/symfony@39e937f · GitHub
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[Form] add CallbackChoiceLoader 
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‎src/Symfony/Component/Form/ChoiceList/Loader/CallbackChoiceLoader.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\Loader;
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use Symfony\Component\Form\ChoiceList\ArrayChoiceList;
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/**
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* Loads a {@link ArrayChoiceList} interface from any callable.
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*
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* @author Jules Pietri <jules@heahprod.com>
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*/
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class CallbackChoiceLoader implements ChoiceLoaderInterface
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{
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/**
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* The callable used to load the choices.
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*
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* @var callable
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*/
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private $callback;
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/**
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* The loaded choice list.
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*
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* @var ArrayChoiceList
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*/
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private $choiceList;
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public function __construct(callable $callback)
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{
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$this->callback = $callback;
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}
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/**
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* {@inheritdoc}
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*/
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public function loadChoiceList($value = null)
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{
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if (null !== $this->choiceList) {
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return $this->choiceList;
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}
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return $this->choiceList = new ArrayChoiceList(call_user_func($this->callback), $value);
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}
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/**
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* {@inheritdoc}
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*/
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public function loadChoicesForValues(array $values, $value = null)
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{
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// Optimize
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if (empty($values)) {
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return array();
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}
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if (null === $this->choiceList) {
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$this->loadChoiceList($value);
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}
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return $this->choiceList->getChoicesForValues($values);
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}
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/**
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* {@inheritdoc}
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*/
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public function loadValuesForChoices(array $choices, $value = null)
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{
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// Optimize
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if (empty($choices)) {
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return array();
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}
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if (null === $this->choiceList) {
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$this->loadChoiceList($value);
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}
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return $this->choiceList->getValuesForChoices($choices);
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}
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}

‎src/Symfony/Component/Form/Tests/ChoiceList/Loader/AbstractChoiceLoaderTest.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\Tests\ChoiceList\Loader;
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use Symfony\Component\Form\ChoiceList\LazyChoiceList;
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/**
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* @author Jules Pietri <jules@heahprod.com>
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*/
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abstract class AbstractChoiceLoaderTest extends \PHPUnit_Framework_TestCase
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{
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/**
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* @var \Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface
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*/
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private $loader;
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/**
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* @var null|callable
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*/
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private $value;
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/**
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* @var array||Traversable
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*/
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private $choices;
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/**
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* @var string[]
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*/
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private $choiceValues;
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/**
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* @var \Symfony\Component\Form\ChoiceList\LazyChoiceList
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*/
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private $lazyChoiceList;
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protected function setUp()
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{
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parent::setUp();
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$this->loader = $this->createChoiceLoader();
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$this->value = $this->getValue();
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$this->choices = $this->getChoices();
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$this->choiceValues = $this->getChoiceValues();
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$this->lazyChoiceList = new LazyChoiceList($this->loader, $this->value);
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}
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public function testLoadChoiceList()
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{
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$this->assertInstanceOf('\Symfony\Component\Form\ChoiceList\ChoiceListInterface', $this->loader->loadChoiceList($this->value));
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}
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public function testLoadChoiceListOnlyOnce()
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{
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$loadedChoiceList = $this->loader->loadChoiceList($this->value);
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$this->assertSame($loadedChoiceList, $this->loader->loadChoiceList($this->value));
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}
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public function testLoadChoicesForValuesLoadsChoiceListOnFirstCall()
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{
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$this->assertSame(
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$this->loader->loadChoicesForValues($this->choiceValues, $this->value),
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$this->lazyChoiceList->getChoicesForValues($this->choiceValues),
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'Choice list should not be reloaded.'
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);
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}
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public function testLoadValuesForChoicesLoadsChoiceListOnFirstCall()
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{
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$this->assertSame(
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$this->loader->loadValuesForChoices($this->choices, $this->value),
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$this->lazyChoiceList->getValuesForChoices($this->choices),
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'Choice list should not be reloaded.'
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);
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}
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protected function tearDown()
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{
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parent::tearDown();
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$this->loader = null;
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$this->value = null;
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$this->choices = array();
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$this->choiceValues = array();
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$this->lazyChoiceList = null;
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}
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/**
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* @return \Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface
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*/
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abstract protected function createChoiceLoader();
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/**
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* @return null|callable
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*/
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abstract protected function getValue();
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/**
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* @return array|\Traversable
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*/
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abstract protected function getChoices();
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/**
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* @return string[]
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*/
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abstract protected function getChoiceValues();
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}

‎src/Symfony/Component/Form/Tests/ChoiceList/Loader/CallbackChoiceLoaderTest.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\Tests\ChoiceList\Loader;
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use Symfony\Component\Form\ChoiceList\Loader\CallbackChoiceLoader;
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/**
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* @author Jules Pietri <jules@heahprod.com>
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*/
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class CallbackChoiceLoaderTest extends AbstractChoiceLoaderTest
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{
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protected function setUp()
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{
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parent::setUp();
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}
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protected function tearDown()
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{
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parent::tearDown();
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}
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/**
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* @return \Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface
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*/
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protected function createChoiceLoader()
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{
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return new CallbackChoiceLoader(function() {
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return $this->getChoices();
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});
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}
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/**
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* @return null|callable
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*/
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protected function getValue() {
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return function ($choice) {
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return isset($choice->value) ? $choice->value : null;
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};
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}
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/**
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* @return array|\Traversable
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*/
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protected function getChoices()
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{
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return array(
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(object) array('value' => 'choice_one'),
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(object) array('value' => 'choice_two'),
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);
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}
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/**
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* @return string[]
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*/
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protected function getChoiceValues()
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{
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return array('choice_one', 'choice_two');
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}
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}

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