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<?php
/*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the MIT license. For more information, see
* <http://www.doctrine-project.org>.
*/

namespace Doctrine\ORM;

use Exception;
use Doctrine\Common\EventManager;
use Doctrine\DBAL\Connection;
use Doctrine\DBAL\LockMode;
use Doctrine\ORM\Query\ResultSetMapping;
use Doctrine\ORM\Proxy\ProxyFactory;
use Doctrine\ORM\Query\FilterCollection;
use Doctrine\Common\Util\ClassUtils;

/**
* The EntityManager is the central access point to ORM functionality.
*
* It is a facade to all different ORM subsystems such as UnitOfWork,
* Query Language and Repository API. Instantiation is done through
* the static create() method. The quickest way to obtain a fully
* configured EntityManager is:
*
* use Doctrine\ORM\Tools\Setup;
* use Doctrine\ORM\EntityManager;
*
* $paths = array('/path/to/entity/mapping/files');
*
* $config = Setup::createAnnotationMetadataConfiguration($paths);
* $dbParams = array('driver' => 'pdo_sqlite', 'memory' => true);
* $entityManager = EntityManager::create($dbParams, $config);
*
* For more information see
* {@link http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/configuration.html}
*
* You should never attempt to inherit from the EntityManager: Inheritance
* is not a valid extension point for the EntityManager. Instead you
* should take a look at the {@see \Doctrine\ORM\Decorator\EntityManagerDecorator}
* and wrap your entity manager in a decorator.
*
* @since 2.0
* @author Benjamin Eberlei <kontakt@beberlei.de>
* @author Guilherme Blanco <guilhermeblanco@hotmail.com>
* @author Jonathan Wage <jonwage@gmail.com>
* @author Roman Borschel <roman@code-factory.org>
*/
/* final */class EntityManager implements EntityManagerInterface
{
    /**
* The used Configuration.
*
* @var \Doctrine\ORM\Configuration
*/
    private $config;

    /**
* The database connection used by the EntityManager.
*
* @var \Doctrine\DBAL\Connection
*/
    private $conn;

    /**
* The metadata factory, used to retrieve the ORM metadata of entity classes.
*
* @var \Doctrine\ORM\Mapping\ClassMetadataFactory
*/
    private $metadataFactory;

    /**
* The UnitOfWork used to coordinate object-level transactions.
*
* @var \Doctrine\ORM\UnitOfWork
*/
    private $unitOfWork;

    /**
* The event manager that is the central point of the event system.
*
* @var \Doctrine\Common\EventManager
*/
    private $eventManager;

    /**
* The proxy factory used to create dynamic proxies.
*
* @var \Doctrine\ORM\Proxy\ProxyFactory
*/
    private $proxyFactory;

    /**
* The repository factory used to create dynamic repositories.
*
* @var \Doctrine\ORM\Repository\RepositoryFactory
*/
    private $repositoryFactory;

    /**
* The expression builder instance used to generate query expressions.
*
* @var \Doctrine\ORM\Query\Expr
*/
    private $expressionBuilder;

    /**
* Whether the EntityManager is closed or not.
*
* @var bool
*/
    private $closed = false;

    /**
* Collection of query filters.
*
* @var \Doctrine\ORM\Query\FilterCollection
*/
    private $filterCollection;

    /**
* @var \Doctrine\ORM\Cache The second level cache regions API.
*/
    private $cache;

    /**
* Creates a new EntityManager that operates on the given database connection
* and uses the given Configuration and EventManager implementations.
*
* @param \Doctrine\DBAL\Connection $conn
* @param \Doctrine\ORM\Configuration $config
* @param \Doctrine\Common\EventManager $eventManager
*/
    protected function __construct(Connection $conn, Configuration $config, EventManager $eventManager)
    {
        $this->conn = $conn;
        $this->config = $config;
        $this->eventManager = $eventManager;

        $metadataFactoryClassName = $config->getClassMetadataFactoryName();

        $this->metadataFactory = new $metadataFactoryClassName;
        $this->metadataFactory->setEntityManager($this);
        $this->metadataFactory->setCacheDriver($this->config->getMetadataCacheImpl());

        $this->repositoryFactory = $config->getRepositoryFactory();
        $this->unitOfWork = new UnitOfWork($this);
        $this->proxyFactory = new ProxyFactory(
            $this,
            $config->getProxyDir(),
            $config->getProxyNamespace(),
            $config->getAutoGenerateProxyClasses()
        );

        if ($config->isSecondLevelCacheEnabled()) {
            $cacheConfig = $config->getSecondLevelCacheConfiguration();
            $cacheFactory = $cacheConfig->getCacheFactory();
            $this->cache = $cacheFactory->createCache($this);
        }
    }

    /**
* {@inheritDoc}
*/
    public function getConnection()
    {
        return $this->conn;
    }

    /**
* Gets the metadata factory used to gather the metadata of classes.
*
* @return \Doctrine\ORM\Mapping\ClassMetadataFactory
*/
    public function getMetadataFactory()
    {
        return $this->metadataFactory;
    }

    /**
* {@inheritDoc}
*/
    public function getExpressionBuilder()
    {
        if ($this->expressionBuilder === null) {
            $this->expressionBuilder = new Query\Expr;
        }

        return $this->expressionBuilder;
    }

    /**
* {@inheritDoc}
*/
    public function beginTransaction()
    {
        $this->conn->beginTransaction();
    }

    /**
* {@inheritDoc}
*/
    public function getCache()
    {
        return $this->cache;
    }

    /**
* {@inheritDoc}
*/
    public function transactional($func)
    {
        if (!is_callable($func)) {
            throw new \InvalidArgumentException('Expected argument of type "callable", got "' . gettype($func) . '"');
        }

        $this->conn->beginTransaction();

        try {
            $return = call_user_func($func, $this);

            $this->flush();
            $this->conn->commit();

            return $return ?: true;
        } catch (Exception $e) {
            $this->close();
            $this->conn->rollback();

            throw $e;
        }
    }

    /**
* {@inheritDoc}
*/
    public function commit()
    {
        $this->conn->commit();
    }

    /**
* {@inheritDoc}
*/
    public function rollback()
    {
        $this->conn->rollback();
    }

    /**
* Returns the ORM metadata descriptor for a class.
*
* The class name must be the fully-qualified class name without a leading backslash
* (as it is returned by get_class($obj)) or an aliased class name.
*
* Examples:
* MyProject\Domain\User
* sales:PriceRequest
*
* @param string $className
*
* @return \Doctrine\ORM\Mapping\ClassMetadata
*
* @internal Performance-sensitive method.
*/
    public function getClassMetadata($className)
    {
        return $this->metadataFactory->getMetadataFor($className);
    }

    /**
* {@inheritDoc}
*/
    public function createQuery($dql = '')
    {
        $query = new Query($this);

        if ( ! empty($dql)) {
            $query->setDql($dql);
        }

        return $query;
    }

    /**
* {@inheritDoc}
*/
    public function createNamedQuery($name)
    {
        return $this->createQuery($this->config->getNamedQuery($name));
    }

    /**
* {@inheritDoc}
*/
    public function createNativeQuery($sql, ResultSetMapping $rsm)
    {
        $query = new NativeQuery($this);

        $query->setSql($sql);
        $query->setResultSetMapping($rsm);

        return $query;
    }

    /**
* {@inheritDoc}
*/
    public function createNamedNativeQuery($name)
    {
        list($sql, $rsm) = $this->config->getNamedNativeQuery($name);

        return $this->createNativeQuery($sql, $rsm);
    }

    /**
* {@inheritDoc}
*/
    public function createQueryBuilder()
    {
        return new QueryBuilder($this);
    }

    /**
* Flushes all changes to objects that have been queued up to now to the database.
* This effectively synchronizes the in-memory state of managed objects with the
* database.
*
* If an entity is explicitly passed to this method only this entity and
* the cascade-persist semantics + scheduled inserts/removals are synchronized.
*
* @param null|object|array $entity
*
* @return void
*
* @throws \Doctrine\ORM\OptimisticLockException If a version check on an entity that
* makes use of optimistic locking fails.
*/
    public function flush($entity = null)
    {
        $this->errorIfClosed();

        $this->unitOfWork->commit($entity);
    }

    /**
* Finds an Entity by its identifier.
*
* @param string $entityName The class name of the entity to find.
* @param mixed $id The identity of the entity to find.
* @param integer|null $lockMode One of the \Doctrine\DBAL\LockMode::* constants
* or NULL if no specific lock mode should be used
* during the search.
* @param integer|null $lockVersion The version of the entity to find when using
* optimistic locking.
*
* @return object|null The entity instance or NULL if the entity can not be found.
*
* @throws OptimisticLockException
* @throws ORMInvalidArgumentException
* @throws TransactionRequiredException
* @throws ORMException
*/
    public function find($entityName, $id, $lockMode = null, $lockVersion = null)
    {
        $class = $this->metadataFactory->getMetadataFor(ltrim($entityName, '\\'));

        if ( ! is_array($id)) {
            if ($class->isIdentifierComposite) {
                throw ORMInvalidArgumentException::invalidCompositeIdentifier();
            }

            $id = array($class->identifier[0] => $id);
        }

        foreach ($id as $i => $value) {
            if (is_object($value) && $this->metadataFactory->hasMetadataFor(ClassUtils::getClass($value))) {
                $id[$i] = $this->unitOfWork->getSingleIdentifierValue($value);

                if ($id[$i] === null) {
                    throw ORMInvalidArgumentException::invalidIdentifierBindingEntity();
                }
            }
        }

        $sortedId = array();

        foreach ($class->identifier as $identifier) {
            if ( ! isset($id[$identifier])) {
                throw ORMException::missingIdentifierField($class->name, $identifier);
            }

            $sortedId[$identifier] = $id[$identifier];
            unset($id[$identifier]);
        }

        if ($id) {
            throw ORMException::unrecognizedIdentifierFields($class->name, array_keys($id));
        }

        $unitOfWork = $this->getUnitOfWork();

        // Check identity map first
        if (($entity = $unitOfWork->tryGetById($sortedId, $class->rootEntityName)) !== false) {
            if ( ! ($entity instanceof $class->name)) {
                return null;
            }

            switch (true) {
                case LockMode::OPTIMISTIC === $lockMode:
                    $this->lock($entity, $lockMode, $lockVersion);
                    break;

                case LockMode::NONE === $lockMode:
                case LockMode::PESSIMISTIC_READ === $lockMode;
                case LockMode::PESSIMISTIC_WRITE === $lockMode:
                    $persister = $unitOfWork->getEntityPersister($class->name);
                    $persister->refresh($sortedId, $entity, $lockMode);
                    break;
            }

            return $entity; // Hit!
        }

        $persister = $unitOfWork->getEntityPersister($class->name);

        switch (true) {
            case LockMode::OPTIMISTIC === $lockMode:
                if ( ! $class->isVersioned) {
                    throw OptimisticLockException::notVersioned($class->name);
                }

                $entity = $persister->load($sortedId);

                $unitOfWork->lock($entity, $lockMode, $lockVersion);

                return $entity;

            case LockMode::NONE === $lockMode:
            case LockMode::PESSIMISTIC_READ === $lockMode:
            case LockMode::PESSIMISTIC_WRITE === $lockMode:
                if ( ! $this->getConnection()->isTransactionActive()) {
                    throw TransactionRequiredException::transactionRequired();
                }

                return $persister->load($sortedId, null, null, array(), $lockMode);

            default:
                return $persister->loadById($sortedId);
        }
    }

    /**
* {@inheritDoc}
*/
    public function getReference($entityName, $id)
    {
        $class = $this->metadataFactory->getMetadataFor(ltrim($entityName, '\\'));

        if ( ! is_array($id)) {
            $id = array($class->identifier[0] => $id);
        }

        $sortedId = array();

        foreach ($class->identifier as $identifier) {
            if ( ! isset($id[$identifier])) {
                throw ORMException::missingIdentifierField($class->name, $identifier);
            }

            $sortedId[$identifier] = $id[$identifier];
        }

        // Check identity map first, if its already in there just return it.
        if (($entity = $this->unitOfWork->tryGetById($sortedId, $class->rootEntityName)) !== false) {
            return ($entity instanceof $class->name) ? $entity : null;
        }

        if ($class->subClasses) {
            return $this->find($entityName, $sortedId);
        }

        if ( ! is_array($sortedId)) {
            $sortedId = array($class->identifier[0] => $sortedId);
        }

        $entity = $this->proxyFactory->getProxy($class->name, $sortedId);

        $this->unitOfWork->registerManaged($entity, $sortedId, array());

        return $entity;
    }

    /**
* {@inheritDoc}
*/
    public function getPartialReference($entityName, $identifier)
    {
        $class = $this->metadataFactory->getMetadataFor(ltrim($entityName, '\\'));

        // Check identity map first, if its already in there just return it.
        if (($entity = $this->unitOfWork->tryGetById($identifier, $class->rootEntityName)) !== false) {
            return ($entity instanceof $class->name) ? $entity : null;
        }

        if ( ! is_array($identifier)) {
            $identifier = array($class->identifier[0] => $identifier);
        }

        $entity = $class->newInstance();

        $class->setIdentifierValues($entity, $identifier);

        $this->unitOfWork->registerManaged($entity, $identifier, array());
        $this->unitOfWork->markReadOnly($entity);

        return $entity;
    }

    /**
* Clears the EntityManager. All entities that are currently managed
* by this EntityManager become detached.
*
* @param string|null $entityName if given, only entities of this type will get detached
*
* @return void
*/
    public function clear($entityName = null)
    {
        $this->unitOfWork->clear($entityName);
    }

    /**
* {@inheritDoc}
*/
    public function close()
    {
        $this->clear();

        $this->closed = true;
    }

    /**
* Tells the EntityManager to make an instance managed and persistent.
*
* The entity will be entered into the database at or before transaction
* commit or as a result of the flush operation.
*
* NOTE: The persist operation always considers entities that are not yet known to
* this EntityManager as NEW. Do not pass detached entities to the persist operation.
*
* @param object $entity The instance to make managed and persistent.
*
* @return void
*
* @throws ORMInvalidArgumentException
*/
    public function persist($entity)
    {
        if ( ! is_object($entity)) {
            throw ORMInvalidArgumentException::invalidObject('EntityManager#persist()' , $entity);
        }

        $this->errorIfClosed();

        $this->unitOfWork->persist($entity);
    }

    /**
* Removes an entity instance.
*
* A removed entity will be removed from the database at or before transaction commit
* or as a result of the flush operation.
*
* @param object $entity The entity instance to remove.
*
* @return void
*
* @throws ORMInvalidArgumentException
*/
    public function remove($entity)
    {
        if ( ! is_object($entity)) {
            throw ORMInvalidArgumentException::invalidObject('EntityManager#remove()' , $entity);
        }

        $this->errorIfClosed();

        $this->unitOfWork->remove($entity);
    }

    /**
* Refreshes the persistent state of an entity from the database,
* overriding any local changes that have not yet been persisted.
*
* @param object $entity The entity to refresh.
*
* @return void
*
* @throws ORMInvalidArgumentException
*/
    public function refresh($entity)
    {
        if ( ! is_object($entity)) {
            throw ORMInvalidArgumentException::invalidObject('EntityManager#refresh()' , $entity);
        }

        $this->errorIfClosed();

        $this->unitOfWork->refresh($entity);
    }

    /**
* Detaches an entity from the EntityManager, causing a managed entity to
* become detached. Unflushed changes made to the entity if any
* (including removal of the entity), will not be synchronized to the database.
* Entities which previously referenced the detached entity will continue to
* reference it.
*
* @param object $entity The entity to detach.
*
* @return void
*
* @throws ORMInvalidArgumentException
*/
    public function detach($entity)
    {
        if ( ! is_object($entity)) {
            throw ORMInvalidArgumentException::invalidObject('EntityManager#detach()' , $entity);
        }

        $this->unitOfWork->detach($entity);
    }

    /**
* Merges the state of a detached entity into the persistence context
* of this EntityManager and returns the managed copy of the entity.
* The entity passed to merge will not become associated/managed with this EntityManager.
*
* @param object $entity The detached entity to merge into the persistence context.
*
* @return object The managed copy of the entity.
*
* @throws ORMInvalidArgumentException
*/
    public function merge($entity)
    {
        if ( ! is_object($entity)) {
            throw ORMInvalidArgumentException::invalidObject('EntityManager#merge()' , $entity);
        }

        $this->errorIfClosed();

        return $this->unitOfWork->merge($entity);
    }

    /**
* {@inheritDoc}
*
* @todo Implementation need. This is necessary since $e2 = clone $e1; throws an E_FATAL when access anything on $e:
* Fatal error: Maximum function nesting level of '100' reached, aborting!
*/
    public function copy($entity, $deep = false)
    {
        throw new \BadMethodCallException("Not implemented.");
    }

    /**
* {@inheritDoc}
*/
    public function lock($entity, $lockMode, $lockVersion = null)
    {
        $this->unitOfWork->lock($entity, $lockMode, $lockVersion);
    }

    /**
* Gets the repository for an entity class.
*
* @param string $entityName The name of the entity.
*
* @return \Doctrine\ORM\EntityRepository The repository class.
*/
    public function getRepository($entityName)
    {
        return $this->repositoryFactory->getRepository($this, $entityName);
    }

    /**
* Determines whether an entity instance is managed in this EntityManager.
*
* @param object $entity
*
* @return boolean TRUE if this EntityManager currently manages the given entity, FALSE otherwise.
*/
    public function contains($entity)
    {
        return $this->unitOfWork->isScheduledForInsert($entity)
            || $this->unitOfWork->isInIdentityMap($entity)
            && ! $this->unitOfWork->isScheduledForDelete($entity);
    }

    /**
* {@inheritDoc}
*/
    public function getEventManager()
    {
        return $this->eventManager;
    }

    /**
* {@inheritDoc}
*/
    public function getConfiguration()
    {
        return $this->config;
    }

    /**
* Throws an exception if the EntityManager is closed or currently not active.
*
* @return void
*
* @throws ORMException If the EntityManager is closed.
*/
    private function errorIfClosed()
    {
        if ($this->closed) {
            throw ORMException::entityManagerClosed();
        }
    }

    /**
* {@inheritDoc}
*/
    public function isOpen()
    {
        return (!$this->closed);
    }

    /**
* {@inheritDoc}
*/
    public function getUnitOfWork()
    {
        return $this->unitOfWork;
    }

    /**
* {@inheritDoc}
*/
    public function getHydrator($hydrationMode)
    {
        return $this->newHydrator($hydrationMode);
    }

    /**
* {@inheritDoc}
*/
    public function newHydrator($hydrationMode)
    {
        switch ($hydrationMode) {
            case Query::HYDRATE_OBJECT:
                return new Internal\Hydration\ObjectHydrator($this);

            case Query::HYDRATE_ARRAY:
                return new Internal\Hydration\ArrayHydrator($this);

            case Query::HYDRATE_SCALAR:
                return new Internal\Hydration\ScalarHydrator($this);

            case Query::HYDRATE_SINGLE_SCALAR:
                return new Internal\Hydration\SingleScalarHydrator($this);

            case Query::HYDRATE_SIMPLEOBJECT:
                return new Internal\Hydration\SimpleObjectHydrator($this);

            default:
                if (($class = $this->config->getCustomHydrationMode($hydrationMode)) !== null) {
                    return new $class($this);
                }
        }

        throw ORMException::invalidHydrationMode($hydrationMode);
    }

    /**
* {@inheritDoc}
*/
    public function getProxyFactory()
    {
        return $this->proxyFactory;
    }

    /**
* {@inheritDoc}
*/
    public function initializeObject($obj)
    {
        $this->unitOfWork->initializeObject($obj);
    }

    /**
* Factory method to create EntityManager instances.
*
* @param mixed $conn An array with the connection parameters or an existing Connection instance.
* @param Configuration $config The Configuration instance to use.
* @param EventManager $eventManager The EventManager instance to use.
*
* @return EntityManager The created EntityManager.
*
* @throws \InvalidArgumentException
* @throws ORMException
*/
    public static function create($conn, Configuration $config, EventManager $eventManager = null)
    {
        if ( ! $config->getMetadataDriverImpl()) {
            throw ORMException::missingMappingDriverImpl();
        }

        switch (true) {
            case (is_array($conn)):
                $conn = \Doctrine\DBAL\DriverManager::getConnection(
                    $conn, $config, ($eventManager ?: new EventManager())
                );
                break;

            case ($conn instanceof Connection):
                if ($eventManager !== null && $conn->getEventManager() !== $eventManager) {
                     throw ORMException::mismatchedEventManager();
                }
                break;

            default:
                throw new \InvalidArgumentException("Invalid argument: " . $conn);
        }

        return new EntityManager($conn, $config, $conn->getEventManager());
    }

    /**
* {@inheritDoc}
*/
    public function getFilters()
    {
        if (null === $this->filterCollection) {
            $this->filterCollection = new FilterCollection($this);
        }

        return $this->filterCollection;
    }

    /**
* {@inheritDoc}
*/
    public function isFiltersStateClean()
    {
        return null === $this->filterCollection || $this->filterCollection->isClean();
    }

    /**
* {@inheritDoc}
*/
    public function hasFilters()
    {
        return null !== $this->filterCollection;
    }
}
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