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name : ValidationVisitor.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\Validator;

use Symfony\Component\Validator\Exception\NoSuchMetadataException;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;
use Symfony\Component\Translation\TranslatorInterface;

/**
 * Default implementation of {@link ValidationVisitorInterface} and
 * {@link GlobalExecutionContextInterface}.
 *
 * @author Bernhard Schussek <bschussek@gmail.com>
 */
class ValidationVisitor implements ValidationVisitorInterface, GlobalExecutionContextInterface
{
    /**
     * @var mixed
     */
    private $root;

    /**
     * @var MetadataFactoryInterface
     */
    private $metadataFactory;

    /**
     * @var ConstraintValidatorFactoryInterface
     */
    private $validatorFactory;

    /**
     * @var TranslatorInterface
     */
    private $translator;

    /**
     * @var null|string
     */
    private $translationDomain;

    /**
     * @var array
     */
    private $objectInitializers;

    /**
     * @var ConstraintViolationList
     */
    private $violations;

    /**
     * @var array
     */
    private $validatedObjects = array();

    /**
     * Creates a new validation visitor.
     *
     * @param mixed                               $root               The value passed to the validator.
     * @param MetadataFactoryInterface            $metadataFactory    The factory for obtaining metadata instances.
     * @param ConstraintValidatorFactoryInterface $validatorFactory   The factory for creating constraint validators.
     * @param TranslatorInterface                 $translator         The translator for translating violation messages.
     * @param string|null                         $translationDomain  The domain of the translation messages.
     * @param ObjectInitializerInterface[]        $objectInitializers The initializers for preparing objects before validation.
     *
     * @throws UnexpectedTypeException If any of the object initializers is not an instance of ObjectInitializerInterface
     */
    public function __construct($root, MetadataFactoryInterface $metadataFactory, ConstraintValidatorFactoryInterface $validatorFactory, TranslatorInterface $translator, $translationDomain = null, array $objectInitializers = array())
    {
        foreach ($objectInitializers as $initializer) {
            if (!$initializer instanceof ObjectInitializerInterface) {
                throw new UnexpectedTypeException($initializer, 'Symfony\Component\Validator\ObjectInitializerInterface');
            }
        }

        $this->root = $root;
        $this->metadataFactory = $metadataFactory;
        $this->validatorFactory = $validatorFactory;
        $this->translator = $translator;
        $this->translationDomain = $translationDomain;
        $this->objectInitializers = $objectInitializers;
        $this->violations = new ConstraintViolationList();
    }

    /**
     * {@inheritdoc}
     */
    public function visit(MetadataInterface $metadata, $value, $group, $propertyPath)
    {
        $context = new ExecutionContext(
            $this,
            $this->translator,
            $this->translationDomain,
            $metadata,
            $value,
            $group,
            $propertyPath
        );

        $context->validateValue($value, $metadata->findConstraints($group));
    }

    /**
     * {@inheritdoc}
     */
    public function validate($value, $group, $propertyPath, $traverse = false, $deep = false)
    {
        if (null === $value) {
            return;
        }

        if (is_object($value)) {
            $hash = spl_object_hash($value);

            // Exit, if the object is already validated for the current group
            if (isset($this->validatedObjects[$hash][$group])) {
                return;
            }

            // Remember validating this object before starting and possibly
            // traversing the object graph
            $this->validatedObjects[$hash][$group] = true;

            foreach ($this->objectInitializers as $initializer) {
                if (!$initializer instanceof ObjectInitializerInterface) {
                    throw new \LogicException('Validator initializers must implement ObjectInitializerInterface.');
                }
                $initializer->initialize($value);
            }
        }

        // Validate arrays recursively by default, otherwise every driver needs
        // to implement special handling for arrays.
        // https://github.com/symfony/symfony/issues/6246
        if (is_array($value) || ($traverse && $value instanceof \Traversable)) {
            foreach ($value as $key => $element) {
                // Ignore any scalar values in the collection
                if (is_object($element) || is_array($element)) {
                    // Only repeat the traversal if $deep is set
                    $this->validate($element, $group, $propertyPath.'['.$key.']', $deep, $deep);
                }
            }

            try {
                $this->metadataFactory->getMetadataFor($value)->accept($this, $value, $group, $propertyPath);
            } catch (NoSuchMetadataException $e) {
                // Metadata doesn't necessarily have to exist for
                // traversable objects, because we know how to validate
                // them anyway. Optionally, additional metadata is supported.
            }
        } else {
            $this->metadataFactory->getMetadataFor($value)->accept($this, $value, $group, $propertyPath);
        }
    }

    /**
     * {@inheritdoc}
     */
    public function getViolations()
    {
        return $this->violations;
    }

    /**
     * {@inheritdoc}
     */
    public function getRoot()
    {
        return $this->root;
    }

    /**
     * {@inheritdoc}
     */
    public function getVisitor()
    {
        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function getValidatorFactory()
    {
        return $this->validatorFactory;
    }

    /**
     * {@inheritdoc}
     */
    public function getMetadataFactory()
    {
        return $this->metadataFactory;
    }
}
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