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EDIT :: AbstractDoctrineExtension.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\Bridge\Doctrine\DependencyInjection;

use Symfony\Component\HttpKernel\DependencyInjection\Extension;
use Symfony\Component\DependencyInjection\Alias;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Definition;
use Symfony\Component\DependencyInjection\Reference;
use Symfony\Component\Config\Resource\FileResource;

/**
 * This abstract classes groups common code that Doctrine Object Manager extensions (ORM, MongoDB, CouchDB) need.
 *
 * @author Benjamin Eberlei <kontakt@beberlei.de>
 */
abstract class AbstractDoctrineExtension extends Extension
{
    /**
     * Used inside metadata driver method to simplify aggregation of data.
     *
     * @var array
     */
    protected $aliasMap = array();

/**
     * Used inside metadata driver method to simplify aggregation of data.
     *
     * @var array
     */
    protected $drivers = array();

/**
     * @param array            $objectManager A configured object manager.
     * @param ContainerBuilder $container     A ContainerBuilder instance
     *
     * @throws \InvalidArgumentException
     */
    protected function loadMappingInformation(array $objectManager, ContainerBuilder $container)
    {
        if ($objectManager['auto_mapping']) {
            // automatically register bundle mappings
            foreach (array_keys($container->getParameter('kernel.bundles')) as $bundle) {
                if (!isset($objectManager['mappings'][$bundle])) {
                    $objectManager['mappings'][$bundle] = array(
                        'mapping'   => true,
                        'is_bundle' => true,
                    );
                }
            }
        }

foreach ($objectManager['mappings'] as $mappingName => $mappingConfig) {
            if (null !== $mappingConfig && false === $mappingConfig['mapping']) {
                continue;
            }

$mappingConfig = array_replace(array(
                'dir'    => false,
                'type'   => false,
                'prefix' => false,
            ), (array) $mappingConfig);

$mappingConfig['dir'] = $container->getParameterBag()->resolveValue($mappingConfig['dir']);
            // a bundle configuration is detected by realizing that the specified dir is not absolute and existing
            if (!isset($mappingConfig['is_bundle'])) {
                $mappingConfig['is_bundle'] = !is_dir($mappingConfig['dir']);
            }

if ($mappingConfig['is_bundle']) {
                $bundle = null;
                foreach ($container->getParameter('kernel.bundles') as $name => $class) {
                    if ($mappingName === $name) {
                        $bundle = new \ReflectionClass($class);

break;
                    }
                }

if (null === $bundle) {
                    throw new \InvalidArgumentException(sprintf('Bundle "%s" does not exist or it is not enabled.', $mappingName));
                }

$mappingConfig = $this->getMappingDriverBundleConfigDefaults($mappingConfig, $bundle, $container);
                if (!$mappingConfig) {
                    continue;
                }
            }

$this->assertValidMappingConfiguration($mappingConfig, $objectManager['name']);
            $this->setMappingDriverConfig($mappingConfig, $mappingName);
            $this->setMappingDriverAlias($mappingConfig, $mappingName);
        }
    }

/**
     * Register the alias for this mapping driver.
     *
     * Aliases can be used in the Query languages of all the Doctrine object managers to simplify writing tasks.
     *
     * @param array  $mappingConfig
     * @param string $mappingName
     */
    protected function setMappingDriverAlias($mappingConfig, $mappingName)
    {
        if (isset($mappingConfig['alias'])) {
            $this->aliasMap[$mappingConfig['alias']] = $mappingConfig['prefix'];
        } else {
            $this->aliasMap[$mappingName] = $mappingConfig['prefix'];
        }
    }

/**
     * Register the mapping driver configuration for later use with the object managers metadata driver chain.
     *
     * @param array  $mappingConfig
     * @param string $mappingName
     *
     * @throws \InvalidArgumentException
     */
    protected function setMappingDriverConfig(array $mappingConfig, $mappingName)
    {
        if (is_dir($mappingConfig['dir'])) {
            $this->drivers[$mappingConfig['type']][$mappingConfig['prefix']] = realpath($mappingConfig['dir']);
        } else {
            throw new \InvalidArgumentException(sprintf('Invalid Doctrine mapping path given. Cannot load Doctrine mapping/bundle named "%s".', $mappingName));
        }
    }

/**
     * If this is a bundle controlled mapping all the missing information can be autodetected by this method.
     *
     * Returns false when autodetection failed, an array of the completed information otherwise.
     *
     * @param array            $bundleConfig
     * @param \ReflectionClass $bundle
     * @param ContainerBuilder $container    A ContainerBuilder instance
     *
     * @return array|false
     */
    protected function getMappingDriverBundleConfigDefaults(array $bundleConfig, \ReflectionClass $bundle, ContainerBuilder $container)
    {
        $bundleDir = dirname($bundle->getFilename());

if (!$bundleConfig['type']) {
            $bundleConfig['type'] = $this->detectMetadataDriver($bundleDir, $container);
        }

if (!$bundleConfig['type']) {
            // skip this bundle, no mapping information was found.
            return false;
        }

if (!$bundleConfig['dir']) {
            if (in_array($bundleConfig['type'], array('annotation', 'staticphp'))) {
                $bundleConfig['dir'] = $bundleDir.'/'.$this->getMappingObjectDefaultName();
            } else {
                $bundleConfig['dir'] = $bundleDir.'/'.$this->getMappingResourceConfigDirectory();
            }
        } else {
            $bundleConfig['dir'] = $bundleDir.'/'.$bundleConfig['dir'];
        }

if (!$bundleConfig['prefix']) {
            $bundleConfig['prefix'] = $bundle->getNamespaceName().'\\'.$this->getMappingObjectDefaultName();
        }

return $bundleConfig;
    }

/**
     * Register all the collected mapping information with the object manager by registering the appropriate mapping drivers.
     *
     * @param array            $objectManager
     * @param ContainerBuilder $container     A ContainerBuilder instance
     */
    protected function registerMappingDrivers($objectManager, ContainerBuilder $container)
    {
        // configure metadata driver for each bundle based on the type of mapping files found
        if ($container->hasDefinition($this->getObjectManagerElementName($objectManager['name'].'_metadata_driver'))) {
            $chainDriverDef = $container->getDefinition($this->getObjectManagerElementName($objectManager['name'].'_metadata_driver'));
        } else {
            $chainDriverDef = new Definition('%'.$this->getObjectManagerElementName('metadata.driver_chain.class%'));
            $chainDriverDef->setPublic(false);
        }

foreach ($this->drivers as $driverType => $driverPaths) {
            $mappingService = $this->getObjectManagerElementName($objectManager['name'].'_'.$driverType.'_metadata_driver');
            if ($container->hasDefinition($mappingService)) {
                $mappingDriverDef = $container->getDefinition($mappingService);
                $args = $mappingDriverDef->getArguments();
                if ($driverType == 'annotation') {
                    $args[1] = array_merge(array_values($driverPaths), $args[1]);
                } else {
                    $args[0] = array_merge(array_values($driverPaths), $args[0]);
                }
                $mappingDriverDef->setArguments($args);
            } elseif ($driverType == 'annotation') {
                $mappingDriverDef = new Definition('%'.$this->getObjectManagerElementName('metadata.'.$driverType.'.class%'), array(
                    new Reference($this->getObjectManagerElementName('metadata.annotation_reader')),
                    array_values($driverPaths)
                ));
            } else {
                $mappingDriverDef = new Definition('%'.$this->getObjectManagerElementName('metadata.'.$driverType.'.class%'), array(
                    array_values($driverPaths)
                ));
            }
            $mappingDriverDef->setPublic(false);
            if (false !== strpos($mappingDriverDef->getClass(), 'yml') || false !== strpos($mappingDriverDef->getClass(), 'xml')) {
                $mappingDriverDef->setArguments(array(array_flip($driverPaths)));
                $mappingDriverDef->addMethodCall('setGlobalBasename', array('mapping'));
            }

$container->setDefinition($mappingService, $mappingDriverDef);

foreach ($driverPaths as $prefix => $driverPath) {
                $chainDriverDef->addMethodCall('addDriver', array(new Reference($mappingService), $prefix));
            }
        }

$container->setDefinition($this->getObjectManagerElementName($objectManager['name'].'_metadata_driver'), $chainDriverDef);
    }

/**
     * Assertion if the specified mapping information is valid.
     *
     * @param array  $mappingConfig
     * @param string $objectManagerName
     *
     * @throws \InvalidArgumentException
     */
    protected function assertValidMappingConfiguration(array $mappingConfig, $objectManagerName)
    {
        if (!$mappingConfig['type'] || !$mappingConfig['dir'] || !$mappingConfig['prefix']) {
            throw new \InvalidArgumentException(sprintf('Mapping definitions for Doctrine manager "%s" require at least the "type", "dir" and "prefix" options.', $objectManagerName));
        }

if (!is_dir($mappingConfig['dir'])) {
            throw new \InvalidArgumentException(sprintf('Specified non-existing directory "%s" as Doctrine mapping source.', $mappingConfig['dir']));
        }

if (!in_array($mappingConfig['type'], array('xml', 'yml', 'annotation', 'php', 'staticphp'))) {
            throw new \InvalidArgumentException(sprintf('Can only configure "xml", "yml", "annotation", "php" or '.
                '"staticphp" through the DoctrineBundle. Use your own bundle to configure other metadata drivers. '.
                'You can register them by adding a new driver to the '.
                '"%s" service definition.', $this->getObjectManagerElementName($objectManagerName.'.metadata_driver')
            ));
        }
    }

/**
     * Detects what metadata driver to use for the supplied directory.
     *
     * @param string           $dir       A directory path
     * @param ContainerBuilder $container A ContainerBuilder instance
     *
     * @return string|null A metadata driver short name, if one can be detected
     */
    protected function detectMetadataDriver($dir, ContainerBuilder $container)
    {
        // add the closest existing directory as a resource
        $configPath = $this->getMappingResourceConfigDirectory();
        $resource = $dir.'/'.$configPath;
        while (!is_dir($resource)) {
            $resource = dirname($resource);
        }

$container->addResource(new FileResource($resource));

$extension = $this->getMappingResourceExtension();
        if (($files = glob($dir.'/'.$configPath.'/*.'.$extension.'.xml')) && count($files)) {
            return 'xml';
        } elseif (($files = glob($dir.'/'.$configPath.'/*.'.$extension.'.yml')) && count($files)) {
            return 'yml';
        } elseif (($files = glob($dir.'/'.$configPath.'/*.'.$extension.'.php')) && count($files)) {
            return 'php';
        }

// add the directory itself as a resource
        $container->addResource(new FileResource($dir));

if (is_dir($dir.'/'.$this->getMappingObjectDefaultName())) {
            return 'annotation';
        }

return null;
    }

/**
     * Loads a configured object manager metadata, query or result cache driver.
     *
     * @param array            $objectManager A configured object manager.
     * @param ContainerBuilder $container     A ContainerBuilder instance.
     * @param string           $cacheName
     *
     * @throws \InvalidArgumentException In case of unknown driver type.
     */
    protected function loadObjectManagerCacheDriver(array $objectManager, ContainerBuilder $container, $cacheName)
    {
        $cacheDriver = $objectManager[$cacheName.'_driver'];
        $cacheDriverService = $this->getObjectManagerElementName($objectManager['name'].'_'.$cacheName);

switch ($cacheDriver['type']) {
            case 'service':
                $container->setAlias($cacheDriverService, new Alias($cacheDriver['id'], false));

return;
            case 'memcache':
                $memcacheClass = !empty($cacheDriver['class']) ? $cacheDriver['class'] : '%'.$this->getObjectManagerElementName('cache.memcache.class').'%';
                $memcacheInstanceClass = !empty($cacheDriver['instance_class']) ? $cacheDriver['instance_class'] : '%'.$this->getObjectManagerElementName('cache.memcache_instance.class').'%';
                $memcacheHost = !empty($cacheDriver['host']) ? $cacheDriver['host'] : '%'.$this->getObjectManagerElementName('cache.memcache_host').'%';
                $memcachePort = !empty($cacheDriver['port']) || (isset($cacheDriver['port']) && $cacheDriver['port'] === 0)  ? $cacheDriver['port'] : '%'.$this->getObjectManagerElementName('cache.memcache_port').'%';
                $cacheDef = new Definition($memcacheClass);
                $memcacheInstance = new Definition($memcacheInstanceClass);
                $memcacheInstance->addMethodCall('connect', array(
                    $memcacheHost, $memcachePort
                ));
                $container->setDefinition($this->getObjectManagerElementName(sprintf('%s_memcache_instance', $objectManager['name'])), $memcacheInstance);
                $cacheDef->addMethodCall('setMemcache', array(new Reference($this->getObjectManagerElementName(sprintf('%s_memcache_instance', $objectManager['name'])))));
                break;
            case 'memcached':
                $memcachedClass = !empty($cacheDriver['class']) ? $cacheDriver['class'] : '%'.$this->getObjectManagerElementName('cache.memcached.class').'%';
                $memcachedInstanceClass = !empty($cacheDriver['instance_class']) ? $cacheDriver['instance_class'] : '%'.$this->getObjectManagerElementName('cache.memcached_instance.class').'%';
                $memcachedHost = !empty($cacheDriver['host']) ? $cacheDriver['host'] : '%'.$this->getObjectManagerElementName('cache.memcached_host').'%';
                $memcachedPort = !empty($cacheDriver['port']) ? $cacheDriver['port'] : '%'.$this->getObjectManagerElementName('cache.memcached_port').'%';
                $cacheDef = new Definition($memcachedClass);
                $memcachedInstance = new Definition($memcachedInstanceClass);
                $memcachedInstance->addMethodCall('addServer', array(
                    $memcachedHost, $memcachedPort
                ));
                $container->setDefinition($this->getObjectManagerElementName(sprintf('%s_memcached_instance', $objectManager['name'])), $memcachedInstance);
                $cacheDef->addMethodCall('setMemcached', array(new Reference($this->getObjectManagerElementName(sprintf('%s_memcached_instance', $objectManager['name'])))));
                break;
             case 'redis':
                $redisClass = !empty($cacheDriver['class']) ? $cacheDriver['class'] : '%'.$this->getObjectManagerElementName('cache.redis.class').'%';
                $redisInstanceClass = !empty($cacheDriver['instance_class']) ? $cacheDriver['instance_class'] : '%'.$this->getObjectManagerElementName('cache.redis_instance.class').'%';
                $redisHost = !empty($cacheDriver['host']) ? $cacheDriver['host'] : '%'.$this->getObjectManagerElementName('cache.redis_host').'%';
                $redisPort = !empty($cacheDriver['port']) ? $cacheDriver['port'] : '%'.$this->getObjectManagerElementName('cache.redis_port').'%';
                $cacheDef = new Definition($redisClass);
                $redisInstance = new Definition($redisInstanceClass);
                $redisInstance->addMethodCall('connect', array(
                    $redisHost, $redisPort
                ));
                $container->setDefinition($this->getObjectManagerElementName(sprintf('%s_redis_instance', $objectManager['name'])), $redisInstance);
                $cacheDef->addMethodCall('setRedis', array(new Reference($this->getObjectManagerElementName(sprintf('%s_redis_instance', $objectManager['name'])))));
                break;
            case 'apc':
            case 'array':
            case 'xcache':
            case 'wincache':
            case 'zenddata':
                $cacheDef = new Definition('%'.$this->getObjectManagerElementName(sprintf('cache.%s.class', $cacheDriver['type'])).'%');
                break;
            default:
                throw new \InvalidArgumentException(sprintf('"%s" is an unrecognized Doctrine cache driver.', $cacheDriver['type']));
        }

$cacheDef->setPublic(false);

if (!isset($cacheDriver['namespace'])) {
            // generate a unique namespace for the given application
            $cacheDriver['namespace'] = 'sf2'.$this->getMappingResourceExtension().'_'.$objectManager['name'].'_'.hash('sha256',($container->getParameter('kernel.root_dir').$container->getParameter('kernel.environment')));
        }

$cacheDef->addMethodCall('setNamespace', array($cacheDriver['namespace']));

$container->setDefinition($cacheDriverService, $cacheDef);
    }

/**
     * Prefixes the relative dependency injection container path with the object manager prefix.
     *
     * @example $name is 'entity_manager' then the result would be 'doctrine.orm.entity_manager'
     *
     * @param string $name
     *
     * @return string
     */
    abstract protected function getObjectManagerElementName($name);

/**
     * Noun that describes the mapped objects such as Entity or Document.
     *
     * Will be used for autodetection of persistent objects directory.
     *
     * @return string
     */
    abstract protected function getMappingObjectDefaultName();

/**
     * Relative path from the bundle root to the directory where mapping files reside.
     *
     * @return string
     */
    abstract protected function getMappingResourceConfigDirectory();

/**
     * Extension used by the mapping files.
     *
     * @return string
     */
    abstract protected function getMappingResourceExtension();
}

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EDIT :: AbstractDoctrineExtension.php