Symfony Form DataMapper that uses a command method to write data back on object

CommandMethodMapper.php

<?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\DataMapper;

use Symfony\Component\Form\Util\VirtualFormAwareIterator;
use Symfony\Component\Form\Exception\UnexpectedTypeException;
use Symfony\Component\Form\Exception\ErrorMappingException;

/**
 * DataMapper using a command method to set values on object.
 *
 * Behaves like PropertyPathMapper with regard to getting values from
 * an object through "get*" methods, but uses a single command method to
 * set all the values from a form. The argument names are inferred through
 * reflection and have to be named after the property path values.
 */
class CommandMethodMapper extends PropertyPathMapper
{
    /**
     * Method to call on data_class of the form to set all values.
     *
     * @var string
     */
    private $methodName;

    public function __construct($methodName)
    {
        $this->methodName = $methodName;
    }

    /**
     * {@inheritdoc}
     */
    public function mapFormsToData(array $forms, &$data)
    {
        if (null === $data) {
            return;
        }

        if (!is_object($data)) {
            throw new UnexpectedTypeException($data, 'object or empty');
        }

        $iterator = new VirtualFormAwareIterator($forms);
        $iterator = new \RecursiveIteratorIterator($iterator);

        $args = new \stdClass;

        foreach ($iterator as $form) {
            /* @var FormInterface $form */
            $propertyPath = $form->getPropertyPath();
            $config = $form->getConfig();

            $elements     = $propertyPath->getElements();
            $firstElement = array_shift($elements);

            if (!isset($args->$firstElement)) {
                $args->$firstElement = null;
            }

            // Write-back is disabled if the form is not synchronized (transformation failed)
            // and if the form is disabled (modification not allowed)
            if (null !== $propertyPath && $config->getMapped() && $form->isSynchronized() && !$form->isDisabled()) {
                // If the data is identical to the value in $data, we are
                // dealing with a reference
                if (!is_object($data) || !$config->getByReference()) {
                    $propertyPath->setValue($args, $form->getData());
                }
            }
        }

        $this->invokeCommand($data, get_object_vars($args));
    }

    protected function invokeCommand($data, array $args)
    {
        $reflObject = new \ReflectionObject($data);
        $reflMethod = $reflObject->getMethod($this->methodName);

        $sortedArgs = array();

        foreach ($reflMethod->getParameters() as $parameter) {
            $name = $parameter->getName();

            if (!isset($args[$name])) {
                throw new ErrorMappingException(
                    "No field " . $name . " exists on form for method ".
                    "'" . $this->methodName . "' argument."
                );
            }

            $sortedArgs[] = $args[$name];
            unset($args[$name]);
        }

        if ($args) {
            throw new ErrorMappingException(
                "Form still has arguments (" . implode(", ", array_keys($args)) . ") ".
                "that cannot be mapped onto arguments of method " . $this->methodName
            );
        }

        $reflMethod->invokeArgs($data, $sortedArgs);
    }
}

CommandMethodMapperTest.php

<?php

namespace Symfony\Component\Form\Tests\Extension\Core\DataMapper;

use Symfony\Component\Form\Form;
use Symfony\Component\Form\FormConfigBuilder;
use Symfony\Component\Form\FormConfigInterface;
use Symfony\Component\Form\Util\PropertyPath;
use Symfony\Component\Form\Extension\Core\DataMapper\CommandMethodMapper;

class CommandMethodMapperTest extends \PHPUnit_Framework_TestCase
{
    /**
     * @var PropertyPathMapper
     */
    private $mapper;

    /**
     * @var \PHPUnit_Framework_MockObject_MockObject
     */
    private $dispatcher;

    protected function setUp()
    {
        if (!class_exists('Symfony\Component\EventDispatcher\Event')) {
            $this->markTestSkipped('The "EventDispatcher" component is not available');
        }

        $this->dispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
    }

    /**
     * @param $path
     * @return \PHPUnit_Framework_MockObject_MockObject
     */
    private function getPropertyPath($path)
    {
        return new \Symfony\Component\Form\Util\PropertyPath($path);
    }

    /**
     * @param FormConfigInterface $config
     * @param Boolean $synchronized
     * @return \PHPUnit_Framework_MockObject_MockObject
     */
    private function getForm(FormConfigInterface $config, $synchronized = true)
    {
        $form = $this->getMockBuilder('Symfony\Component\Form\Form')
            ->setConstructorArgs(array($config))
            ->setMethods(array('isSynchronized'))
            ->getMock();

        $form->expects($this->any())
            ->method('isSynchronized')
            ->will($this->returnValue($synchronized));

        return $form;
    }

    /**
     * @return \PHPUnit_Framework_MockObject_MockObject
     */
    private function getDataMapper()
    {
        return $this->getMock('Symfony\Component\Form\DataMapperInterface');
    }

    public function testMapFormsToData()
    {
        $car = new CommandMapperCar;
        $engine = new \stdClass();
        $propertyPath = $this->getPropertyPath('engine');

        $config = new FormConfigBuilder('name', '\stdClass', $this->dispatcher);
        $config->setByReference(false);
        $config->setPropertyPath($propertyPath);
        $config->setData($engine);
        $form = $this->getForm($config);

        $this->mapper = new CommandMethodMapper("setEngine");
        $this->mapper->mapFormsToData(array($form), $car);

        $this->assertEquals($engine, $car->engine);
    }

    public function testMapFormsToDataWritesBackIfNotByReference()
    {
        $car = new CommandMapperCar;

        $config = new FormConfigBuilder('name', null, $this->dispatcher);
        $config->setByReference(false);
        $config->setPropertyPath($this->getPropertyPath('foo'));
        $config->setData("1");
        $fooForm = $this->getForm($config);

        $config = new FormConfigBuilder('name', null, $this->dispatcher);
        $config->setByReference(false);
        $config->setPropertyPath($this->getPropertyPath('bar'));
        $config->setData("2");
        $barForm = $this->getForm($config);

        $config = new FormConfigBuilder('name', null, $this->dispatcher);
        $config->setByReference(false);
        $config->setPropertyPath($this->getPropertyPath('engine'));
        $config->setData("3");
        $engineForm = $this->getForm($config);

        $this->mapper = new CommandMethodMapper("command");
        $this->mapper->mapFormsToData(array($fooForm, $barForm, $engineForm), $car);

        $this->assertEquals(1, $car->foo);
        $this->assertEquals(2, $car->bar);
        $this->assertEquals(3, $car->engine);
    }
}

class CommandMapperCar
{
    public $foo;
    public $bar;
    public $engine;

    public function setEngine($engine)
    {
        $this->engine = $engine;
    }

    public function command($foo, $bar, $engine)
    {
        $this->foo = $foo;
        $this->bar = $bar;
        $this->engine = $engine;
    }
}