<?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\ODM\MongoDB;

use Doctrine\Common\EventManager;
use Doctrine\Common\Persistence\ObjectManager;
use Doctrine\Common\Persistence\ObjectRepository;
use Doctrine\MongoDB\Connection;
use Doctrine\ODM\MongoDB\Mapping\ClassMetadata;
use Doctrine\ODM\MongoDB\Mapping\MappingException;
use Doctrine\ODM\MongoDB\Hydrator\HydratorFactory;
use Doctrine\ODM\MongoDB\Proxy\ProxyFactory;
use Doctrine\ODM\MongoDB\Query\FilterCollection;
use Doctrine\ODM\MongoDB\Repository\RepositoryFactory;
use const E_USER_DEPRECATED;
use function sprintf;
use function trigger_error;

/**
 * The DocumentManager class is the central access point for managing the
 * persistence of documents.
 *
 *     <?php
 *
 *     $config = new Configuration();
 *     $dm = DocumentManager::create(new Connection(), $config);
 *
 * @since       1.0
 */
class DocumentManager implements ObjectManager
{
    /**
     * The Doctrine MongoDB connection instance.
     *
     * @var \Doctrine\MongoDB\Connection
     */
    private $connection;

    /**
     * The used Configuration.
     *
     * @var \Doctrine\ODM\MongoDB\Configuration
     */
    private $config;

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

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

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

    /**
     * The Hydrator factory instance.
     *
     * @var HydratorFactory
     */
    private $hydratorFactory;

    /**
     * The Proxy factory instance.
     *
     * @var ProxyFactory
     */
    private $proxyFactory;

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

    /**
     * SchemaManager instance
     *
     * @var SchemaManager
     */
    private $schemaManager;

    /**
     * Array of cached document database instances that are lazily loaded.
     *
     * @var array
     */
    private $documentDatabases = array();

    /**
     * Array of cached document collection instances that are lazily loaded.
     *
     * @var array
     */
    private $documentCollections = array();

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

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

    /**
     * Creates a new Document that operates on the given Mongo connection
     * and uses the given Configuration.
     *
     * @param \Doctrine\MongoDB\Connection|null $conn
     * @param Configuration|null $config
     * @param \Doctrine\Common\EventManager|null $eventManager
     */
    protected function __construct(Connection $conn = null, Configuration $config = null, EventManager $eventManager = null)
    {
        $this->config = $config ?: new Configuration();
        $this->eventManager = $eventManager ?: new EventManager();
        $this->connection = $conn ?: new Connection(null, array(), $this->config, $this->eventManager);

        $metadataFactoryClassName = $this->config->getClassMetadataFactoryName();
        $this->metadataFactory = new $metadataFactoryClassName();
        $this->metadataFactory->setDocumentManager($this);
        $this->metadataFactory->setConfiguration($this->config);
        if ($cacheDriver = $this->config->getMetadataCacheImpl()) {
            $this->metadataFactory->setCacheDriver($cacheDriver);
        }

        $hydratorDir = $this->config->getHydratorDir();
        $hydratorNs = $this->config->getHydratorNamespace();
        $this->hydratorFactory = new HydratorFactory(
            $this,
            $this->eventManager,
            $hydratorDir,
            $hydratorNs,
            $this->config->getAutoGenerateHydratorClasses()
        );

        $this->unitOfWork = new UnitOfWork($this, $this->eventManager, $this->hydratorFactory);
        $this->hydratorFactory->setUnitOfWork($this->unitOfWork);
        $this->schemaManager = new SchemaManager($this, $this->metadataFactory);
        $this->proxyFactory = new ProxyFactory($this,
            $this->config->getProxyDir(),
            $this->config->getProxyNamespace(),
            $this->config->getAutoGenerateProxyClasses()
        );
        $this->repositoryFactory = $this->config->getRepositoryFactory();
    }

    /**
     * Gets the proxy factory used by the DocumentManager to create document proxies.
     *
     * @return ProxyFactory
     */
    public function getProxyFactory()
    {
        return $this->proxyFactory;
    }

    /**
     * Creates a new Document that operates on the given Mongo connection
     * and uses the given Configuration.
     *
     * @static
     * @param \Doctrine\MongoDB\Connection|null $conn
     * @param Configuration|null $config
     * @param \Doctrine\Common\EventManager|null $eventManager
     * @return DocumentManager
     */
    public static function create(Connection $conn = null, Configuration $config = null, EventManager $eventManager = null)
    {
        return new static($conn, $config, $eventManager);
    }

    /**
     * Gets the EventManager used by the DocumentManager.
     *
     * @return \Doctrine\Common\EventManager
     */
    public function getEventManager()
    {
        return $this->eventManager;
    }

    /**
     * Gets the PHP Mongo instance that this DocumentManager wraps.
     *
     * @return \Doctrine\MongoDB\Connection
     */
    public function getConnection()
    {
        return $this->connection;
    }

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

    /**
     * Helper method to initialize a lazy loading proxy or persistent collection.
     *
     * This method is a no-op for other objects.
     *
     * @param object $obj
     */
    public function initializeObject($obj)
    {
        $this->unitOfWork->initializeObject($obj);
    }

    /**
     * Gets the UnitOfWork used by the DocumentManager to coordinate operations.
     *
     * @return UnitOfWork
     */
    public function getUnitOfWork()
    {
        return $this->unitOfWork;
    }

    /**
     * Gets the Hydrator factory used by the DocumentManager to generate and get hydrators
     * for each type of document.
     *
     * @return HydratorFactory
     */
    public function getHydratorFactory()
    {
        return $this->hydratorFactory;
    }

    /**
     * Returns SchemaManager, used to create/drop indexes/collections/databases.
     *
     * @return \Doctrine\ODM\MongoDB\SchemaManager
     */
    public function getSchemaManager()
    {
        return $this->schemaManager;
    }

    /**
     * Returns the metadata for a class.
     *
     * @param string $className The class name.
     * @return \Doctrine\ODM\MongoDB\Mapping\ClassMetadata
     */
    public function getClassMetadata($className)
    {
        return $this->metadataFactory->getMetadataFor(ltrim($className, '\\'));
    }

    /**
     * Returns the MongoDB instance for a class.
     *
     * @param string $className The class name.
     * @return \Doctrine\MongoDB\Database
     */
    public function getDocumentDatabase($className)
    {
        $className = ltrim($className, '\\');

        if (isset($this->documentDatabases[$className])) {
            return $this->documentDatabases[$className];
        }

        $metadata = $this->metadataFactory->getMetadataFor($className);
        $db = $metadata->getDatabase();
        $db = $db ?: $this->config->getDefaultDB();
        $db = $db ?: 'doctrine';
        $this->documentDatabases[$className] = $this->connection->selectDatabase($db);

        return $this->documentDatabases[$className];
    }

    /**
     * Gets the array of instantiated document database instances.
     *
     * @return array
     */
    public function getDocumentDatabases()
    {
        return $this->documentDatabases;
    }

    /**
     * Returns the MongoCollection instance for a class.
     *
     * @param string $className The class name.
     * @throws MongoDBException When the $className param is not mapped to a collection
     * @return \Doctrine\MongoDB\Collection
     */
    public function getDocumentCollection($className)
    {
        $className = ltrim($className, '\\');

        $metadata = $this->metadataFactory->getMetadataFor($className);
        $collectionName = $metadata->getCollection();

        if ( ! $collectionName) {
            throw MongoDBException::documentNotMappedToCollection($className);
        }

        if ( ! isset($this->documentCollections[$className])) {
            $db = $this->getDocumentDatabase($className);

            $this->documentCollections[$className] = $metadata->isFile()
                ? $db->getGridFS($collectionName)
                : $db->selectCollection($collectionName);
        }

        $collection = $this->documentCollections[$className];

        if ($metadata->slaveOkay !== null) {
            $collection->setSlaveOkay($metadata->slaveOkay);
        }

        if ($metadata->readPreference !== null) {
            $collection->setReadPreference($metadata->readPreference, $metadata->readPreferenceTags);
        }

        return $this->documentCollections[$className];
    }

    /**
     * Gets the array of instantiated document collection instances.
     *
     * @return array
     */
    public function getDocumentCollections()
    {
        return $this->documentCollections;
    }

    /**
     * Create a new Query instance for a class.
     *
     * @param string $documentName The document class name.
     * @return Query\Builder
     */
    public function createQueryBuilder($documentName = null)
    {
        return new Query\Builder($this, $documentName);
    }

    /**
     * Creates a new aggregation builder instance for a class.
     *
     * @param string $documentName The document class name.
     * @return Aggregation\Builder
     */
    public function createAggregationBuilder($documentName)
    {
        return new Aggregation\Builder($this, $documentName);
    }

    /**
     * Tells the DocumentManager to make an instance managed and persistent.
     *
     * The document 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 documents that are not yet known to
     * this DocumentManager as NEW. Do not pass detached documents to the persist operation.
     *
     * @param object $document The instance to make managed and persistent.
     * @throws \InvalidArgumentException When the given $document param is not an object
     */
    public function persist($document)
    {
        if ( ! is_object($document)) {
            throw new \InvalidArgumentException(gettype($document));
        }
        $this->errorIfClosed();
        $this->unitOfWork->persist($document);
    }

    /**
     * Removes a document instance.
     *
     * A removed document will be removed from the database at or before transaction commit
     * or as a result of the flush operation.
     *
     * @param object $document The document instance to remove.
     * @throws \InvalidArgumentException when the $document param is not an object
     */
    public function remove($document)
    {
        if ( ! is_object($document)) {
            throw new \InvalidArgumentException(gettype($document));
        }
        $this->errorIfClosed();
        $this->unitOfWork->remove($document);
    }

    /**
     * Refreshes the persistent state of a document from the database,
     * overriding any local changes that have not yet been persisted.
     *
     * @param object $document The document to refresh.
     * @throws \InvalidArgumentException When the given $document param is not an object
     */
    public function refresh($document)
    {
        if ( ! is_object($document)) {
            throw new \InvalidArgumentException(gettype($document));
        }
        $this->errorIfClosed();
        $this->unitOfWork->refresh($document);
    }

    /**
     * Detaches a document from the DocumentManager, causing a managed document to
     * become detached.  Unflushed changes made to the document if any
     * (including removal of the document), will not be synchronized to the database.
     * Documents which previously referenced the detached document will continue to
     * reference it.
     *
     * @param object $document The document to detach.
     * @throws \InvalidArgumentException when the $document param is not an object
     */
    public function detach($document)
    {
        if ( ! is_object($document)) {
            throw new \InvalidArgumentException(gettype($document));
        }
        $this->unitOfWork->detach($document);
    }

    /**
     * Merges the state of a detached document into the persistence context
     * of this DocumentManager and returns the managed copy of the document.
     * The document passed to merge will not become associated/managed with this DocumentManager.
     *
     * @param object $document The detached document to merge into the persistence context.
     * @throws LockException
     * @throws \InvalidArgumentException if the $document param is not an object
     * @return object The managed copy of the document.
     */
    public function merge($document)
    {
        if ( ! is_object($document)) {
            throw new \InvalidArgumentException(gettype($document));
        }
        $this->errorIfClosed();
        return $this->unitOfWork->merge($document);
    }

    /**
     * Acquire a lock on the given document.
     *
     * @param object $document
     * @param int $lockMode
     * @param int $lockVersion
     * @throws \InvalidArgumentException
     */
    public function lock($document, $lockMode, $lockVersion = null)
    {
        if ( ! is_object($document)) {
            throw new \InvalidArgumentException(gettype($document));
        }
        $this->unitOfWork->lock($document, $lockMode, $lockVersion);
    }

    /**
     * Releases a lock on the given document.
     *
     * @param object $document
     * @throws \InvalidArgumentException if the $document param is not an object
     */
    public function unlock($document)
    {
        if ( ! is_object($document)) {
            throw new \InvalidArgumentException(gettype($document));
        }
        $this->unitOfWork->unlock($document);
    }

    /**
     * Gets the repository for a document class.
     *
     * @param string $documentName  The name of the Document.
     * @return ObjectRepository  The repository.
     */
    public function getRepository($documentName)
    {
        return $this->repositoryFactory->getRepository($this, $documentName);
    }

    /**
     * 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.
     *
     * @param object|array $documentOrOptions
     * @param array $options Array of options to be used with batchInsert(), update() and remove()
     * @throws \InvalidArgumentException
     */
    public function flush($documentOrOptions = null, array $options = array())
    {
        if (func_num_args() === 1 && is_array($documentOrOptions) && ! $this->arrayContainsDocuments($documentOrOptions)) {
            $options = $documentOrOptions;
            $documentOrOptions = null;
        }
        if (null !== $documentOrOptions && ! is_object($documentOrOptions) && ! is_array($documentOrOptions)) {
            throw new \InvalidArgumentException(gettype($documentOrOptions));
        }
        if (!empty($documentOrOptions)) {
            @trigger_error(
                'Flushing selected documents has been deprecated and will be removed in doctrine/mongodb-odm 2.0.',
                E_USER_DEPRECATED
            );
        } elseif (func_num_args() === 2) {
            @trigger_error(
                sprintf('Flushing selected documents has been deprecated and will be removed in doctrine/mongodb-odm 2.0. You can omit the first argument to %s.', __METHOD__),
                E_USER_DEPRECATED
            );
        }
        $this->errorIfClosed();
        $this->unitOfWork->commit($documentOrOptions, $options);
    }

    /**
     * Gets a reference to the document identified by the given type and identifier
     * without actually loading it.
     *
     * If partial objects are allowed, this method will return a partial object that only
     * has its identifier populated. Otherwise a proxy is returned that automatically
     * loads itself on first access.
     *
     * @param string $documentName
     * @param string|object $identifier
     * @return mixed|object The document reference.
     */
    public function getReference($documentName, $identifier)
    {
        /* @var $class \Doctrine\ODM\MongoDB\Mapping\ClassMetadata */
        $class = $this->metadataFactory->getMetadataFor(ltrim($documentName, '\\'));

        // Check identity map first, if its already in there just return it.
        if ($document = $this->unitOfWork->tryGetById($identifier, $class)) {
            return $document;
        }

        $document = $this->proxyFactory->getProxy($class->name, array($class->identifier => $identifier));
        $this->unitOfWork->registerManaged($document, $identifier, array());

        return $document;
    }

    /**
     * Gets a partial reference to the document identified by the given type and identifier
     * without actually loading it, if the document is not yet loaded.
     *
     * The returned reference may be a partial object if the document is not yet loaded/managed.
     * If it is a partial object it will not initialize the rest of the document state on access.
     * Thus you can only ever safely access the identifier of a document obtained through
     * this method.
     *
     * The use-cases for partial references involve maintaining bidirectional associations
     * without loading one side of the association or to update a document without loading it.
     * Note, however, that in the latter case the original (persistent) document data will
     * never be visible to the application (especially not event listeners) as it will
     * never be loaded in the first place.
     *
     * @param string $documentName The name of the document type.
     * @param mixed $identifier The document identifier.
     * @return object The (partial) document reference.
     */
    public function getPartialReference($documentName, $identifier)
    {
        $class = $this->metadataFactory->getMetadataFor(ltrim($documentName, '\\'));

        // Check identity map first, if its already in there just return it.
        if ($document = $this->unitOfWork->tryGetById($identifier, $class)) {
            return $document;
        }
        $document = $class->newInstance();
        $class->setIdentifierValue($document, $identifier);
        $this->unitOfWork->registerManaged($document, $identifier, array());

        return $document;
    }

    /**
     * Finds a Document by its identifier.
     *
     * This is just a convenient shortcut for getRepository($documentName)->find($id).
     *
     * @param string $documentName
     * @param mixed $identifier
     * @param int $lockMode
     * @param int $lockVersion
     * @return object $document
     */
    public function find($documentName, $identifier, $lockMode = LockMode::NONE, $lockVersion = null)
    {
        return $this->getRepository($documentName)->find($identifier, $lockMode, $lockVersion);
    }

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

    /**
     * Closes the DocumentManager. All documents that are currently managed
     * by this DocumentManager become detached. The DocumentManager may no longer
     * be used after it is closed.
     */
    public function close()
    {
        $this->clear();
        $this->closed = true;
    }

    /**
     * Determines whether a document instance is managed in this DocumentManager.
     *
     * @param object $document
     * @throws \InvalidArgumentException When the $document param is not an object
     * @return boolean TRUE if this DocumentManager currently manages the given document, FALSE otherwise.
     */
    public function contains($document)
    {
        if ( ! is_object($document)) {
            throw new \InvalidArgumentException(gettype($document));
        }
        return $this->unitOfWork->isScheduledForInsert($document) ||
            $this->unitOfWork->isInIdentityMap($document) &&
            ! $this->unitOfWork->isScheduledForDelete($document);
    }

    /**
     * Gets the Configuration used by the DocumentManager.
     *
     * @return Configuration
     */
    public function getConfiguration()
    {
        return $this->config;
    }

    /**
     * Returns a reference to the supplied document.
     *
     * @param object $document A document object
     * @param array $referenceMapping Mapping for the field that references the document
     *
     * @throws \InvalidArgumentException
     * @return mixed The reference for the document in question, according to the desired mapping
     */
    public function createReference($document, array $referenceMapping)
    {
        if ( ! is_object($document)) {
            throw new \InvalidArgumentException('Cannot create a DBRef, the document is not an object');
        }

        $class = $this->getClassMetadata(get_class($document));
        $id = $this->unitOfWork->getDocumentIdentifier($document);

        if ($id === null) {
            throw new \RuntimeException(
                sprintf('Cannot create a DBRef for class %s without an identifier. Have you forgotten to persist/merge the document first?', $class->name)
            );
        }

        $storeAs = isset($referenceMapping['storeAs']) ? $referenceMapping['storeAs'] : null;
        switch ($storeAs) {
            case ClassMetadata::REFERENCE_STORE_AS_ID:
                if ($class->inheritanceType === ClassMetadata::INHERITANCE_TYPE_SINGLE_COLLECTION) {
                    throw MappingException::simpleReferenceMustNotTargetDiscriminatedDocument($referenceMapping['targetDocument']);
                }

                return $class->getDatabaseIdentifierValue($id);
                break;


            case ClassMetadata::REFERENCE_STORE_AS_REF:
                $reference = ['id' => $class->getDatabaseIdentifierValue($id)];
                break;

            case ClassMetadata::REFERENCE_STORE_AS_DB_REF:
                $reference = [
                    '$ref' => $class->getCollection(),
                    '$id'  => $class->getDatabaseIdentifierValue($id),
                ];
                break;

            case ClassMetadata::REFERENCE_STORE_AS_DB_REF_WITH_DB:
                $reference = [
                    '$ref' => $class->getCollection(),
                    '$id'  => $class->getDatabaseIdentifierValue($id),
                    '$db'  => $this->getDocumentDatabase($class->name)->getName(),
                ];
                break;

            default:
                throw new \InvalidArgumentException("Reference type {$storeAs} is invalid.");
        }

        return $reference + $this->getDiscriminatorData($referenceMapping, $class);
    }

    /**
     * Build discriminator portion of reference for specified reference mapping and class metadata.
     *
     * @param array         $referenceMapping Mappings of reference for which discriminator data is created.
     * @param ClassMetadata $class            Metadata of reference document class.
     *
     * @return array with next structure [{discriminator field} => {discriminator value}]
     *
     * @throws MappingException When discriminator map is present and reference class in not registered in it.
     */
    private function getDiscriminatorData(array $referenceMapping, ClassMetadata $class)
    {
        $discriminatorField = null;
        $discriminatorValue = null;
        $discriminatorMap   = null;

        if (isset($referenceMapping['discriminatorField'])) {
            $discriminatorField = $referenceMapping['discriminatorField'];

            if (isset($referenceMapping['discriminatorMap'])) {
                $discriminatorMap = $referenceMapping['discriminatorMap'];
            }
        } else {
            $discriminatorField = $class->discriminatorField;
            $discriminatorValue = $class->discriminatorValue;
            $discriminatorMap   = $class->discriminatorMap;
        }

        if ($discriminatorField === null) {
            return [];
        }

        if ($discriminatorValue === null) {
            if (! empty($discriminatorMap)) {
                $pos = array_search($class->name, $discriminatorMap);

                if ($pos !== false) {
                    $discriminatorValue = $pos;
                }
            } else {
                $discriminatorValue = $class->name;
            }
        }

        if ($discriminatorValue === null) {
            @trigger_error(sprintf('Document class "%s" is unlisted in the discriminator map for reference "%s". This is deprecated and will throw an exception in doctrine/mongodb-odm 2.0.', $class->name, $referenceMapping['name']), E_USER_DEPRECATED);
            $discriminatorValue = $class->name;
        }

        return [$discriminatorField => $discriminatorValue];
    }

    /**
     * Returns a DBRef array for the supplied document.
     *
     * @param mixed $document A document object
     * @param array $referenceMapping Mapping for the field that references the document
     *
     * @throws \InvalidArgumentException
     * @return array A DBRef array
     * @deprecated Deprecated in favor of createReference; will be removed in 2.0
     */
    public function createDBRef($document, array $referenceMapping = null)
    {
        @trigger_error(sprintf('The "%s" method has been deprecated and will be removed in doctrine/mongodb-odm 2.0. Use createReference() instead.', __METHOD__), E_USER_DEPRECATED);

        if (!isset($referenceMapping['storeAs'])) {
            $referenceMapping['storeAs'] = ClassMetadata::REFERENCE_STORE_AS_DB_REF;
        }

        return $this->createReference($document, $referenceMapping);
    }

    /**
     * Throws an exception if the DocumentManager is closed or currently not active.
     *
     * @throws MongoDBException If the DocumentManager is closed.
     */
    private function errorIfClosed()
    {
        if ($this->closed) {
            throw MongoDBException::documentManagerClosed();
        }
    }

    /**
     * Check if the Document manager is open or closed.
     *
     * @return bool
     */
    public function isOpen()
    {
        return ( ! $this->closed);
    }

    /**
     * Gets the filter collection.
     *
     * @return \Doctrine\ODM\MongoDB\Query\FilterCollection The active filter collection.
     */
    public function getFilterCollection()
    {
        if (null === $this->filterCollection) {
            $this->filterCollection = new FilterCollection($this);
        }

        return $this->filterCollection;
    }

    private function arrayContainsDocuments(array $documentOrOptions)
    {
        foreach ($documentOrOptions as $documentPerhaps) {
            if (! is_object($documentPerhaps)) {
                return false;
            }
            if (! $this->getMetadataFactory()->isTransient(get_class($documentPerhaps))) {
                return true;
            }
        }

        return false;
    }
}