LazyLoadingMetadataFactory.php in Plug 7

Namespace

Symfony\Component\Validator\Mapping\Factory

File

lib/Symfony/validator/Symfony/Component/Validator/Mapping/Factory/LazyLoadingMetadataFactory.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <[e-mail]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Symfony\Component\Validator\Mapping\Factory;

use Symfony\Component\Validator\Exception\NoSuchMetadataException;
use Symfony\Component\Validator\Mapping\Cache\CacheInterface;
use Symfony\Component\Validator\Mapping\ClassMetadata;
use Symfony\Component\Validator\Mapping\ClassMetadataInterface;
use Symfony\Component\Validator\Mapping\Loader\LoaderChain;
use Symfony\Component\Validator\Mapping\Loader\LoaderInterface;

/**
 * Creates new {@link ClassMetadataInterface} instances.
 *
 * Whenever {@link getMetadataFor()} is called for the first time with a given
 * class name or object of that class, a new metadata instance is created and
 * returned. On subsequent requests for the same class, the same metadata
 * instance will be returned.
 *
 * You can optionally pass a {@link LoaderInterface} instance to the constructor.
 * Whenever a new metadata instance is created, it is passed to the loader,
 * which can configure the metadata based on configuration loaded from the
 * filesystem or a database. If you want to use multiple loaders, wrap them in a
 * {@link LoaderChain}.
 *
 * You can also optionally pass a {@link CacheInterface} instance to the
 * constructor. This cache will be used for persisting the generated metadata
 * between multiple PHP requests.
 *
 * @author Bernhard Schussek <[e-mail]>
 */
class LazyLoadingMetadataFactory implements MetadataFactoryInterface {

  /**
   * The loader for loading the class metadata
   *
   * @var LoaderInterface|null
   */
  protected $loader;

  /**
   * The cache for caching class metadata
   *
   * @var CacheInterface|null
   */
  protected $cache;

  /**
   * The loaded metadata, indexed by class name
   *
   * @var ClassMetadata[]
   */
  protected $loadedClasses = array();

  /**
   * Creates a new metadata factory.
   *
   * @param LoaderInterface|null $loader The loader for configuring new metadata
   * @param CacheInterface|null  $cache  The cache for persisting metadata
   *                                     between multiple PHP requests
   */
  public function __construct(LoaderInterface $loader = null, CacheInterface $cache = null) {
    $this->loader = $loader;
    $this->cache = $cache;
  }

  /**
   * {@inheritdoc}
   *
   * If the method was called with the same class name (or an object of that
   * class) before, the same metadata instance is returned.
   *
   * If the factory was configured with a cache, this method will first look
   * for an existing metadata instance in the cache. If an existing instance
   * is found, it will be returned without further ado.
   *
   * Otherwise, a new metadata instance is created. If the factory was
   * configured with a loader, the metadata is passed to the
   * {@link LoaderInterface::loadClassMetadata()} method for further
   * configuration. At last, the new object is returned.
   */
  public function getMetadataFor($value) {
    if (!is_object($value) && !is_string($value)) {
      throw new NoSuchMetadataException(sprintf('Cannot create metadata for non-objects. Got: %s', gettype($value)));
    }
    $class = ltrim(is_object($value) ? get_class($value) : $value, '\\');
    if (isset($this->loadedClasses[$class])) {
      return $this->loadedClasses[$class];
    }
    if (null !== $this->cache && false !== ($this->loadedClasses[$class] = $this->cache
      ->read($class))) {
      return $this->loadedClasses[$class];
    }
    if (!class_exists($class) && !interface_exists($class)) {
      throw new NoSuchMetadataException(sprintf('The class or interface "%s" does not exist.', $class));
    }
    $metadata = new ClassMetadata($class);

    // Include constraints from the parent class
    if ($parent = $metadata
      ->getReflectionClass()
      ->getParentClass()) {
      $metadata
        ->mergeConstraints($this
        ->getMetadataFor($parent->name));
    }

    // Include constraints from all implemented interfaces
    foreach ($metadata
      ->getReflectionClass()
      ->getInterfaces() as $interface) {
      if ('Symfony\\Component\\Validator\\GroupSequenceProviderInterface' === $interface->name) {
        continue;
      }
      $metadata
        ->mergeConstraints($this
        ->getMetadataFor($interface->name));
    }
    if (null !== $this->loader) {
      $this->loader
        ->loadClassMetadata($metadata);
    }
    if (null !== $this->cache) {
      $this->cache
        ->write($metadata);
    }
    return $this->loadedClasses[$class] = $metadata;
  }

  /**
   * {@inheritdoc}
   */
  public function hasMetadataFor($value) {
    if (!is_object($value) && !is_string($value)) {
      return false;
    }
    $class = ltrim(is_object($value) ? get_class($value) : $value, '\\');
    if (class_exists($class) || interface_exists($class)) {
      return true;
    }
    return false;
  }

}

Classes

Name	Description
LazyLoadingMetadataFactory	Creates new {@link ClassMetadataInterface} instances.